A form submit event in GWT and GQuery is causing an IncompatibleRemoteServiceException. This project includes GQuery (GWT version of JQuery) which is used to call the form submit. Here's the code for it. The event is inserted in onmoduleload function:
$("#search_form").submit(new Function(){
public void f() {
QueryRequest query = new QueryRequest();
String keywords = $("#keyword_search_box").val();
query.setKeywords(keywords);
greetingService.search(query, new AsyncCallback<QueryResponse>() {
#Override
public void onFailure(Throwable caught) {
Window.alert(COUNLDNT_REACH_SERVER);
}
#Override
public void onSuccess(QueryResponse result) {
$("#page").add(renderResponse(result));
}
});
}
});
The exception shows up whenever the submit button is clicked. If the server call is made from outside the submit event, it works fine - otherwise public void onFailure(Throwable caught) is executed. Here's the exception:
Starting Jetty on port 8888
[WARN] greetServlet: An IncompatibleRemoteServiceException was thrown while processing this call.
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: This application is out of date, please click the refresh button on your browser. ( Could not locate requested method 'greetServer(com.project.shared.QueryRequest)' in interface 'com.project.client.GreetingService' )
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:310)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:206)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Most possible reason is jars version.
Check if the gwt-servlet.jar is uptodate. The gwt-user.jar and gwt-servlet.jar must have the same version.
see A discussion here on the same.
Related
We are in process of migration our Web application from Wicket 6.30 to Wicket 8.11.0.
As a first step, placed below jars in the classpath.
wicket-auth-roles-8.11.0.jar
wicket-core-8.11.0.jar
wicket-datetime-8.0.0-M7.jar
wicket-extensions-8.11.0.jar
wicket-request-8.11.0.jar
wicket-util-8.11.0.jar
wicketstuff-inmethod-grid-8.11.0.jar
Addressed the compilation issues related to AjaxFallBackLink onClick() method .
Changed the method signature to public void onClick(Optional target).
We have a Html page
SettingsPanel.html
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd" lang="en">
<wicket:panel>
<img wicket:id="saveIcon" />
</wicket:panel>
</html>
SettingsPanel.java
AjaxFallbackLink<Serializable> settingsLink = new AjaxFallbackLink<Serializable>("saveSettingsLink") {
private static final long serialVersionUID = 1L;
#Override
public void onClick(Optional<AjaxRequestTarget> target) {
//some logic
target.get().add(feedback);
}
};
Image img = new Image("saveIcon", new Model<Serializable>() {
private static final long serialVersionUID = 1L;
#Override
public Serializable getObject() {
return new PackageResourceReference(SettingsPanel.class,"save.png");
}
});
img.add(new AttributeModifier("title", new StringResourceModel("saveTitle", ColumnSettingsLinkPanel.this,new Model<String>())));
settingsLink.add(img);
With the above code, in Wicket 6.30, save image (save.png) gets displayed on the page and when user clicks on the image link, onlick(AjaxRequestTarget target) gets triggered.
Post migrating to Wicket 8.11.0, image is not displaying on the page and when user clicks on the image link, onClick(Optional target) getting triggered, but the target value is always Empty.
Below is the stack trace
ERROR - DefaultExceptionMapper - Unexpected error occurred
java.util.NoSuchElementException: No value present
at java.base/java.util.Optional.get(Optional.java:148)
at com.csc.pts.web.ui.ColumnSettingsLinkPanel$3.onClick(SettingsPanel.java:98)
at org.apache.wicket.ajax.markup.html.AjaxFallbackLink.onClick(AjaxFallbackLink.java:122)
at org.apache.wicket.markup.html.link.Link.onRequest(Link.java:189)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.internalInvoke(ListenerRequestHandler.java:306)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.invoke(ListenerRequestHandler.java:255)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.invokeListener(ListenerRequestHandler.java:215)
at org.apache.wicket.core.request.handler.ListenerRequestHandler.respond(ListenerRequestHandler.java:208)
at org.apache.wicket.core.request.handler.RequestSettingRequestHandler.respond(RequestSettingRequestHandler.java:78)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:912)
at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:65)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:283)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:253)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:262)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:204)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:286)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
Can you please advise on the changes required to make this functionality work with Wicket 8.11.0 version.
Thanks,
Satya
You have to use
target.ifPresent(t -> t.add(feedback));
instead of
target.get().add(feedback);
I am attempt to use the Blobstore api for appengine using GWT...
I promise you! I had it working for months and suddenly I started
get the following errors.. arfter executing the following line from
a servelet.
public class ImageServiceImpl extends RemoteServiceServlet implements ImageService {
/**
*
*/
private static final long serialVersionUID = 1L;
// init the blog store service
private BlobstoreService blobService = BlobstoreServiceFactory.getBlobstoreService();
//private static final Logger log = Logger.getLogger(ImageServiceImpl.class);
public static final String PATH_TO_DEFAULT_IMAGE = "images/no_photo.jpg";
.
.
.
.
.
// omitted for brevity
}
#Override
public String getUpLoadPath() {
String url = blobService.createUploadUrl("/n5/doimage");
return url;
}
}
Initializing App Engine server
Sep 19, 2011 7:28:45 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Sep 19, 2011 7:28:45 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed C:\development\n5\n5\war\WEB-INF/appengine-web.xml
Sep 19, 2011 7:28:45 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed C:\development\n5\n5\war\WEB-INF/web.xml
Sep 19, 2011 3:28:47 PM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The server is running at http://localhost:8888/
Sep 19, 2011 7:34:59 PM com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String com.six.n5.client.service.ImageService.getUpLoadPath()' threw an unexpected exception: java.lang.VerifyError: class com.google.appengine.api.blobstore.BlobstoreServicePb$CreateUploadURLRequest overrides final method isInitialized.()Z
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:216)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:141)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:93)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:63)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:122)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:110)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:351)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.VerifyError: class com.google.appengine.api.blobstore.BlobstoreServicePb$CreateUploadURLRequest overrides final method isInitialized.()Z
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.google.appengine.api.blobstore.BlobstoreServiceImpl.createUploadUrl(BlobstoreServiceImpl.java:43)
at com.google.appengine.api.blobstore.BlobstoreServiceImpl.createUploadUrl(BlobstoreServiceImpl.java:34)
at com.six.n5.server.ImageServiceImpl.getUpLoadPath(ImageServiceImpl.java:153)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
... 39 more
I found my own error! as it turn out the reason this was suddenly failing was because the FORM post thought it was cross domain posting. I was testing the web site by calling 127.0.0.1:8888..etc but when the when my Image RPC was called to establish the upload path, it returned to the form setAction the my machine name kmoore-PC:8888..etc instead of the 127.0.0.1:8888... and hence it returned null because it thought it was crossing domains.
To fix, click on the google box in url bar and add your computer name and then test you app using the computer name instead of 127
I tried replacing local host with machine name it didn't help, but it is a cross domain java-script issue so I tried just using the URL pattern assigned in the web xml and I got a String result. The result is my response wrapped with XML and I plan to parse it. if any one has something more elegant please tell me.
here is the response String [it looks a bit different because it affects the stack overflow page]:
pre style="word-wrap: break-word; white-space: pre-wrap;">my response id
Here is the relevant server code
public void doPost(HttpServletRequest request, HttpServletResponse response) throws >ServletException, IOException
{
//Redirect recursively to this servlet (calls doGet)
response.sendRedirect("/blobstoreexample/uploadservice?id=" + >item_image_blob_key);
}
}
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException
{
System.out.println("shonka");
//Send the meta-data id back to the client in the HttpServletResponse response
String id = req.getParameter("id");
response.getWriter().write(id);
return;
}
Here is the relevant client code, no need for parsing here is the server side code:
uploadForm.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
#Override
public void onSubmitComplete(SubmitCompleteEvent event) {
//The submit complete Event Results will contain the unique
//identifier for the picture's meta-data. Trim it to remove
//trailing spaces and line breaks
System.out.println("uploadForm onSubmitComplete() results are: " + event.getResults());
Window.alert(event.getResults());
if(event.getResults() != null)
{
// getPicture(event.getResults().trim());
}
else
{
Window.alert(event.getResults());
}
}
});
Edit I found a more elegant way to deliver a long id
//Redirect recursively to this servlet (calls doGet)
response.sendRedirect("/itemmanager/receive?id=" + item.getKey().getId());
}
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
System.out.println("entered do post");
//Send the meta-data id back to the client in the HttpServletResponse response
String id = req.getParameter("id");
System.out.println("entered do post id is: " + id);
resp.setHeader("Content-Type", "text/html");
resp.getWriter().println(id);
}
Instead of using the computer name, I simply replace it with the 127 address when in dev mode, like so:
String url = blobstoreService.createUploadUrl("/project/uploadservice");
// change the computer name to standard localhost ip address, if in dev mode
if(SystemProperty.environment.value() == SystemProperty.Environment.Value.Development)
{
url = url.replace("Your-PC-Name", "127.0.0.1");
}
I am deploying a GWT application on Equinox. It runs, but when I launch an event to call server, I have an error like this:
<title>Error 500 non-HTTP request or response</title>
</head>
<body><h2>HTTP ERROR 500</h2>
<p>Problem accessing /zbapp/zbapp/app. Reason:
<pre> non-HTTP request or response</pre></p><h3>Caused by:</h3><pre>javax.servlet.ServletException: non-HTTP request or response
at javax.servlet.http.HttpServlet.service(HttpServlet.java:715)
at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.eclipse.equinox.http.jetty.internal.HttpServerManager$InternalHttpServiceServlet.service(HttpServerManager.java:318)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:939)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
</pre>
<hr /><i><small>Powered by Jetty://</small></i><br/>
My web.xml is:
<servlet>
<servlet-name>greetServlet</servlet-name>
<servlet-class>main.java.com.gwt.app.server.GreetingServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>greetServlet</servlet-name>
<url-pattern>/zbapp/app</url-pattern>
</servlet-mapping>
I do not know what is the eral cause of that error. I have overriden service method from HttpServlet in the implementation of GWT Service.
Could someone help me, please?
It fails because of this reason
try {
request = (HttpServletRequest) req;
response = (HttpServletResponse) res;
} catch (ClassCastException e) {
throw new ServletException("non-HTTP request or response");
}
The Request/Response is not of HttpServletRequest/HttpServletResponse type.
Somewhere in the code you are trying to wrap request/response using a class which extends ServletRequest/ServletResponse. If the application wants to wrap a request/response, the wrapper class should ideally extend HttpServletRequestWrapper/HttpServletResponseWrapper.
Started a new project from scratch, converted to JPA, my persistence provider is EclipseLink, added the necessary libraries (eclipselink.jar, eclipselink.jar, javax.persistence, mysql-connector-java-5.1). Tested the connection, ping ok. Then created a new package New > JPA > Entities from Tables > Selected all Entities and Key generator > Identity.
GestorIpca.java
GestorIpcaService.util.getInstance().getLista(new AsyncCallback<ArrayList<Docente>>() {
#Override
public void onFailure(Throwable caught) {
Window.alert("Erro na Ligacao efectuada");
caught.getStackTrace();
}
#Override
public void onSuccess(ArrayList<Docente> result) {
Window.alert("Ligacao efectuada com sucesso:" + result.size());
}
});
GestorIpcaService
#RemoteServiceRelativePath("greet")
public interface GestorIpcaService extends RemoteService {
String greetServer(String name) throws IllegalArgumentException;
public static class util{
public static GestorIpcaServiceAsync instance;
public static GestorIpcaServiceAsync getInstance(){
if(instance == null){
instance = GWT.create(GestorIpcaService.class);
}
return instance;
}
}
public ArrayList<Docente> getLista() throws IllegalArgumentException;
}
GestorIpcaServiceAsync
public interface GestorIpcaServiceAsync {
void greetServer(String input, AsyncCallback<String> callback)
throws IllegalArgumentException;
void getLista(AsyncCallback<ArrayList<Docente>> callback);
}
GestorIpcaServiceImpl
#SuppressWarnings("serial")
public class GestorIpcaServiceImpl extends RemoteServiceServlet implements
GestorIpcaService {
public ArrayList<Docente> getLista() throws IllegalArgumentException {
//Criamos um EntityManager
EntityManager em = JpaUtil.getEntityManagerFactory().createEntityManager();
//Criamos a consulta
String consulta = "SELECT r from Docente r";
//Executamos a consulta
Query q = em.createQuery(consulta);
ArrayList<Docente> lista = new ArrayList<Docente>(q.getResultList());
return lista;
}
/* public static void main(String args[]){
GestorIpcaServiceImpl serviceImpl = new GestorIpcaServiceImpl();
for (Docente docente : serviceImpl.getLista()){
System.out.println("nome: " + docente.getNome());
}
}
*/
In this file i tried to run as > Java Application and in Console showed me 2 records.
Package com.GestorIpca.factory
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class JpaUtil {
private static final EntityManagerFactory emf;
//Método estático
static{
//BLoco try
try
{
//Criação de EntityManagerFactory
emf = Persistence.createEntityManagerFactory("GestorIpca");
}catch (Throwable e){
//Controlar as excepções
System.err.println("A criação de SessionFactory falhou" + e);
e.printStackTrace();
throw new ExceptionInInitializerError(e);
}
}
public static EntityManagerFactory getEntityManagerFactory(){
return emf;
}
}
My persistence.xml was created automatically. Placed inside META-INF
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="GestorIpca">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>com.GestorIpca.shared.Ano</class>
<class>com.GestorIpca.shared.Categoria</class>
<class>com.GestorIpca.shared.Curso</class>
<class>com.GestorIpca.shared.Disciplina</class>
<class>com.GestorIpca.shared.Disponibilidade</class>
<class>com.GestorIpca.shared.Docente</class>
<class>com.GestorIpca.shared.Sala</class>
<class>com.GestorIpca.shared.Semestre</class>
<class>com.GestorIpca.shared.TipoCurso</class>
<class>com.GestorIpca.shared.Turma</class>
<class>com.GestorIpca.shared.User</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/timetable"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="k771u3"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
</properties>
</persistence-unit>
</persistence>
Last step > Run as > Web Application
Error > Could not connect to database and print a stack trace in Eclipse Console
[EL Info]: 2011-05-09 10:03:08.78--ServerSession(8068087)--EclipseLink, version: Eclipse Persistence Services - 2.2.0.v20110202-r8913
[EL Info]: 2011-05-09 10:03:09.297--ServerSession(8068087)--file:/C:/Users/Martinho/WorkSpace/GestorIpca/war/WEB-INF/classes/_GestorIpca login successful
Starting Jetty on port 8888
[WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException: java.lang.reflect.InvocationTargetException
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:764)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:727)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534)
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:616)
at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:474)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:571)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:746)
... 30 more
Caused by: com.google.gwt.user.client.rpc.SerializationException: Type 'org.eclipse.persistence.indirection.IndirectSet' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = {IndirectSet: not instantiated}
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:614)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:704)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:704)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:45)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:38)
... 35 more
[ERROR] 500 - POST /gestoripca/greet (127.0.0.1) 57 bytes
Request headers
Host: 127.0.0.1:8888
Connection: keep-alive
Referer: http://127.0.0.1:8888/GestorIpca.html?gwt.codesvr=127.0.0.1:9997
Content-Length: 132
Origin: http://127.0.0.1:8888
X-GWT-Module-Base: http://127.0.0.1:8888/gestoripca/
X-GWT-Permutation: HostedMode
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.30 Safari/534.30
Content-Type: text/x-gwt-rpc; charset=UTF-8
Accept: */*
Accept-Encoding: gzip,deflate,sdch
Accept-Language: pt-PT,pt;q=0.8,en-US;q=0.6,en;q=0.4
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Response headers
Content-Type: text/plain
Note: I changed in package com.GestorIpca.shared all my classes generated from tables
public class Ano implements Serializable
to
public class Ano implements IsSerializable
changed also my GestorIpca.gwt.xml and added this lines in end
<extend-configuration-property name="rpc.blacklist" value="com.google.gwt.user.client.ui.*Collection"/>
<extend-configuration-property name="rpc.blacklist" value="-.*List"/>
<extend-configuration-property name="rpc.blacklist" value="-.*Map"/>
<extend-configuration-property name="rpc.blacklist" value="-.*Collection"/>
<extend-configuration-property name="rpc.blacklist" value="+java.util.HashMap"/>
<extend-configuration-property name="rpc.blacklist" value="+java.util.LinkedHashMap"/>
<extend-configuration-property name="rpc.blacklist" value="+java.util.ArrayList"/>
What am i missing?
I depends on how your entities were defined. Maybe there are connections that GWT RPC doesn´t like. in this case i´d suggest create DTO´s or implement RequestFactory
Without knowing what your entities look like I would guess from the exception that the reason is probably how your entities get enhanced by your persistence provider:
What this means for GWT RPC is that by the time the object is ready to be transferred over the wire, it actually isn't the same object that the compiler thought was going to be transferred, so when trying to deserialize, the GWT RPC mechanism no longer knows what the type is and refuses to deserialize it.
Cited from: http://code.google.com/intl/de-DE/webtoolkit/articles/using_gwt_with_hibernate.html
That article also suggests how to create DTOs to solve this problem.
I know this is a very old question, but I ran into this exact issue tonight.
GWT Serialization doesn't seem to like java.util.Set. I almost feel like it was confusing java.util.Set with org.eclipse.persistence.indirection.IndirectSet.
Once I switched Set to ArrayList, the error went away.
Can someone show to throw exception to client in GWT.
in my serviceasync interface i am doing this as well in my service interface
void ActivateUserAccount(String ActivationCode,AsyncCallback <Boolean> Callback) throws AlreadyActivatedError;
in my serverimpl;
i am doing this to throw an exception
public Boolean ActivateUserAccount(String ActivationCode) throws AlreadyActivatedError
{
....
throw new AlreadyActivatedError();
}
my exception is in the form:
public class AlreadyActivatedError extends Exception implements IsSerializable
{
public AlreadyActivatedError()
{
super();
}
}
Just to make everything clear: you can throw both checked (the ones extending Exception) and unchecked (extending RuntimeException) exceptions from the server to the client - as long as the exception is serializable. It is however recommended to throw checked exceptions, as they
represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems, network outages, absent files).
In contrast, unchecked exceptions
represent defects in the program (bugs) - often invalid arguments passed to a non-private method.
Source
As the documentation states, the following conditions have to be fulfilled for an exception to be sent to the client:
It has to extend Exception (note that RuntimeException does that).
It has to be serializable. In short: implement Serializable, have a no-args constructor and have all the fields serializable.
In your *Service interface you need to add a throws declaration to the method that can throw the exception. Note that you don't need to add the throws declaration to the *Async interface.
Once you have that set up, you'll be able to handle the exception in the onFailure method in your AsyncCallback.
Some code to show all the pieces together, based on examples from the guide on the GWT site:
DelistedException.java
public class DelistedException extends Exception implements Serializable {
private String symbol;
// Note the no-args constructor
// It can be protected so that only subclasses could use it
// (because if they want to be serializable too, they'll need
// a no-args constructor that calls the superclasses' no-args constructor...)
protected DelistedException() {
}
public DelistedException(String symbol) {
this.symbol = symbol;
}
public String getSymbol() {
return this.symbol;
}
}
StockPriceService.java
#RemoteServiceRelativePath("stockPrices")
public interface StockPriceService extends RemoteService {
StockPrice[] getPrices(String[] symbols) throws DelistedException;
}
StockPriceServiceAsync.java
public interface StockPriceServiceAsync {
void getPrices(String[] symbols, AsyncCallback<StockPrice[]> callback);
}
On the client side
AsyncCallback<StockPrice[]> callback = new AsyncCallback<StockPrice[]>() {
public void onFailure(Throwable caught) {
if (caught instanceof DelistedException) {
// Do something with it
} else {
// Probably some unchecked exception,
// show some generic error message
}
public void onSuccess(StockPrice[] result) {
// Success!
}
};
stockPriceService.getPrices(symbols, callback);
Not sure why hilal's answer was accepted as it is completely false.
In order for the exceptions to reach the client's browser you must throw a checked exception that is Serializable and defined in the service interfaces.
If your service implementation throws a RuntimeException the web client will receive a generic 500 error messages as follows:
[WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract my.module.shared.Result my.module.client.service.Service.doSomething() throws my.module.shared.exception.MyCheckedException' threw an unexpected exception: my.module.shared.exception.AuthzRuntimeException: some authz message
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:389)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: my.module.shared.exception.AuthzRuntimeException: some authz message
at my.module.shared.Authz.doSomeCheck(Authz.java:101)
at my.module.server.ServiceImpl.doSomething(ServiceImpl.java:283)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)
... 22 more
[ERROR] 500 - POST /module/userService (127.0.0.1) 57 bytes
Request headers
Host: 127.0.0.1:8888
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://127.0.0.1:8888/foo.html?gwt.codesvr=127.0.0.1:9997
Cookie: worknet=7k8g41ulbl674dp865t180tji5
Connection: keep-alive
Cache-Control: no-cache
X-GWT-Permutation: HostedMode
X-GWT-Module-Base: http://127.0.0.1:8888/module/
Content-Type: text/x-gwt-rpc; charset=utf-8
Content-Length: 1076
Pragma: no-cache
Response headers
Content-Type: text/plain
(RequestCallbackAdapter.java:209) 2013-10-18 13:16:56,966 [WARN ] Fail ""
com.google.gwt.user.client.rpc.StatusCodeException: 500 The call failed on the server; see server log for details
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:209)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:258)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:412)
at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242)
at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Unknown Source)
GWT can only handle unchecked exceptions(which means sent from server to client) which are not serialized that extends from RuntimeException. I don't know what AlreadyActivatedError is. If it is not RuntimeException it can't be sent to the client(browser)
Maybe also note that if your specific Exception does not have a standard constructor, the generic 500 error message will also be displayed because it is not possible to deserialize the exception. Sadly, the gwt compiler and dev-mode plugin will not always point this problem out explicitly.. (that's how i got here anyway)
So, in combination with what vinnyjames said (the exception must be Serializable and be defined in the (RPC) service's interface), i found that processing exceptions in gwt client code is not too complicated.