I use JBoss AS 6 with Seam 2.2 in Eclipse. I had create a simple Seam 2 Web Project, (I think with seam gen) and now I wanted to add servlet.
File->New->Servlet
public class Test extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
writer.println("Hello post!");
writer.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
writer.println("Hello get!");
writer.close();
}
}
In web.xml there is also the servlet registrated.
Okay, but when I compile all and go to localhost:8080/mypage/test the page get loaded but no output is visible (also not in the sourcecode of the page).
The symptoms indicate that your project isn't properly deployed. Make sure that your project is properly built and deployed and that the server is cleanly restarted.
Related
I've got a form that I use to post some inputs to one site but I want to post them also to my servlet - is it even possible?
I've tried to do something with submit button, I mean executing onclick with function but something is not working properly
<input type="submit" value="value1" onclick="afterSubmit()"/>
...some inputs...
</form>
form=document.getElementById("${initParam['posturl']}";
function afterSubmit() {
form.action="http://localhost:8080/url/servlet";
}
</script>
And my servlet:
public class sendThis extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println(request.getParameter("item_name_1"));
}
}```
So when I click on submit button and then go to localhost:8080/url/servlet, I get this error:
HTTP Status 405 – Method Not Allowed
Type Status Report
Message HTTP method GET is not supported by this URL
Description The method received in the request-line is known by the origin server but not supported by the target resource.
Add doGet method to your servlet and handle the request:
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println(request.getParameter("item_name_1"));
}
I am trying to write a Java web application that provides both HTML and REST interface. I would like to create a servlet that would provide the HTML interface using JSP, but data should also be accessible via REST.
What I already have is something like this for the REST:
#javax.ws.rs.Path("/api/")
public class RestAPI {
... // Some methods
}
and
#WebServlet("/servlet")
public class MyServlet extends HttpServlet {
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("Howdy at ");
}
}
Now, when I change the #WebServlet("/servlet") annotation to #WebServlet("/"), the servlet stops working probably due to path clash with the REST.
How can I provide REST on specific path and HTML in the root?
Thank you,
Lukas Jendele
This seems to work OK for me. What I did:
In my pom.xml, I have a dependency on org.wildfly.swarm:undertow (for Servlet API) and org.wildfly.swarm:jaxrs (for JAX-RS). And of course the Swarm Maven plugin.
For servlet, I have just this one class:
#WebServlet("/")
public class HelloServlet extends HttpServlet {
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().println("Hello from servlet");
}
}
For JAX-RS, I have these 2 classes:
#ApplicationPath("/api")
public class RestApplication extends Application {
}
#Path("/")
public class HelloResource {
#GET
public Response get() {
return Response.ok().entity("Hello from API").build();
}
}
To test, I run curl http://localhost:8080/ and curl http://localhost:8080/api. Results are as expected. (Maybe my example is too simple?)
I am having a strange problem in deploying a basic web app through Eclipse and Tomcat
The error -
SEVERE: Allocate exception for servlet DeCommServlet
java.lang.ClassNotFoundException: com.authentication.DeCommServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
However, the application still gets to the DeCommServlet doPost() method and tomcat stays deployed but with that error.
Servlet:
<servlet>
<servlet-name>DeCommServlet</servlet-name>
<servlet-class>com.authentication.DeCommServlet</servlet-class>
</servlet>
<!-- Servlet Mappings -->
<servlet-mapping>
<servlet-name>DeCommServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
The servlet class is the correct link but still getting this error. I have nothing in any of the lib folders, but in the application properties I have the Apache Tomcat Lib added in Build Path >> Libraries
Has anyone seen this before?
Code for DeCommServlet:
#WebServlet("/DeCommServlet")
public class DeCommServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public DeCommServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("sdf");
System.out.println("ddd");
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.getUserPrincipal().getName();
response.sendRedirect("http://www.google.com");
}
New Class Path1
This is how your webapp should look like :
> DeCommGlobal
> |-->src
> |-->com
> |-->authentication
> |-->DeCommServlet.java
> |-->META-INF
> |-->WEB-INF
> |-->classes
> |-->lib
It was the deployment assembly that was causing the issue. Added the lib folder and we are good to go! Thanks
I have a servlet which is mapped to application context root using the "" string:
So when I hit the url http://127.0.0.1:8080/myapp/, I can see "This is ROOT!" in the browser. So far so good.
But if I modify something, say changing the String This is ROOT!! to ROOT!! and save the file in eclipse. Eclipse will take a couple of seconds to reload the context. Now if i hit the same url, a 404 page is displayed while all other pages still work fine. Only the root mapping is broken. So I redeploy (eclipse's "run on server") the app and the root mapping is back again. Any ideas on how can I fix this?
#WebServlet("")
public class Root extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().println("This is ROOT!!");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
https://issues.apache.org/bugzilla/show_bug.cgi?id=54955
This is a bug of tomcat 7.0.40.
when you deploy it. Context root is accessible. But reload the app will cause context root to return 404.
I've configured my GWT app with Guice as documented here. With this setup the app works fine.
However what I'd like to do now is get a GWTTestCase to call a service using GWT RPC. To this end I've done this,
Updated my <app>JUnit.gwt.rpc so that the service URL maps to GuiceRemoteServiceServlet
Added an init() method to GuiceRemoteServiceServlet to initialise the Injector as per this comment
Unfortunately I'm still getting an error,
com.google.inject.ProvisionException: Guice provision errors:
Caused by: com.google.inject.OutOfScopeException: Cannot access scoped object. Either we are not currently inside an HTTP Servlet request, or you may have forgotten to apply com.google.inject.servlet.GuiceFilter as a servlet filter for this request.
at com.google.inject.servlet.GuiceFilter.getContext(GuiceFilter.java:132)
at com.google.inject.servlet.GuiceFilter.getRequest(GuiceFilter.java:118)
at com.google.inject.servlet.InternalServletModule$1.get(InternalServletModule.java:35)
.....
The object it's trying to provision is ServletContext. The cause of the error is due to the fact the GuiceFilter hasn't been called so the ServletContext hasn't been bound to ThreadLocal.
Is there any way of getting past this?
In the Junit environment you aren't getting two things that you normally get from the servlet container: the setup/destroy help from the GuiceServletContextListener and the filtering of the GuiceFilter, so you need to do these bits yourself.
You basically need to create another servlet that wraps your servlet and does all the setup/filtering that you'd normally see done by the servlet container; what I recommend is something like this:
Suppose your servlet is called AdriansGuicedGwtServiceServlet. Then create this in your testing directory:
public class TestAdriansGuicedGwtServiceServlet extends AdriansGuicedGwtServiceServlet {
private GuiceFilter filter;
#Override
public void init() {
super.init();
// move your injector-creating code here if you want to
// (I think it's cleaner if you do move it here, instead of leaving
// it in your main servlet)
filter = new GuiceFilter();
filter.init(new FilterConfig() {
public String getFilterName() {
return "GuiceFilter";
}
public ServletContext getServletContext() {
return TestAdriansGuicedGwtServiceServlet.this.getServletContext();
}
public String getInitParameter(String s) {
return null;
}
public Enumeration getInitParameterNames() {
return new Vector(0).elements();
}
});
}
#Override
public void destroy() {
super.destroy();
filter.destroy();
}
private void superService(ServletRequest req, ServletResponse res)
throws ServletException, IOException {
super.service(req, res);
}
#Override
public void service(ServletRequest req, ServletResponse res)
throws ServletException, IOException {
filter.doFilter(new FilterChain() {
public void doFilter (ServletRequest request, ServletResponse response)
throws IOException, ServletException {
superService(request, response);
}
});
}
}
And then in your <app>Junit.gwt.rpc have it map in TestAdriansGuicedGwtServiceServlet instead of your real servlet.