My Java-Code looks like this:
Person.java
public class Person {
private int age;
public Person(int age) {
this.age = age;
}
public boolean isAdult() {
return age >= 18;
}
#Override
public String toString() {
return "Person of age: " + age;
}
}
PersonTest.java
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import org.junit.Test;
import org.junit.runner.RunWith;
import junitparams.JUnitParamsRunner;
import junitparams.Parameters;
#RunWith(JUnitParamsRunner.class)
public class PersonTest {
#Test
#Parameters({
"17, false",
"22, true" })
public void personIsAdult(int age, boolean valid) throws Exception {
assertThat(new Person(age).isAdult(), is(valid));
}
}
And if I press "Run As" => "JUnit Test Case" I get the "java.lang.TypeNotPresentException: Type [unknown] not present".
Here the full Stack Trace:
java.lang.TypeNotPresentException: Type [unknown] not present
at sun.reflect.annotation.TypeNotPresentExceptionProxy.generateException(TypeNotPresentExceptionProxy.java:46)
at sun.reflect.annotation.AnnotationInvocationHandler.invoke(AnnotationInvocationHandler.java:84)
at com.sun.proxy.$Proxy2.value(Unknown Source)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createUnfilteredTest(JUnit4TestLoader.java:84)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:70)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:43)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:444)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.NoClassDefFoundError: org/junit/runners/BlockJUnit4ClassRunner
at java.lang.ClassLoader.findBootstrapClass(Native Method)
at java.lang.ClassLoader.findBootstrapClassOrNull(ClassLoader.java:1015)
at java.lang.ClassLoader.loadClass(ClassLoader.java:413)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:439)
at sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:420)
at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:349)
at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286)
at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120)
at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72)
at java.lang.Class.createAnnotationData(Class.java:3521)
at java.lang.Class.annotationData(Class.java:3510)
at java.lang.Class.getAnnotation(Class.java:3415)
at org.junit.internal.builders.IgnoredBuilder.runnerForClass(IgnoredBuilder.java:10)
... 11 more
JUnit-Version is 4.12
Hamcrest-all Version is 1.3
Hamcrest-core Version is 1.3
Does anyone has an advice how to fix this Problem? Thanks in advance.
I now was able to solve my own problem using this forum here: https://jira.spring.io/browse/SPR-9450
I used the libraries as User Libraries, but obviously this was the mistake. When I use it as external jars in my classpath everything works.
Related
I have followed every step in this (https://blogs.oracle.com/jmxetc/entry/connecting_scenebuilder_edited_fxml_to) tutorial, and yet keep getting an error about this section in the controller class:
myButton.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("That was easy, wasn't it?");
}
});
The only difference I can think of is that it was written for FX 2.0 and not 8.0?
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Error: Unresolved compilation problems:
The method setOnAction(EventHandler<ActionEvent>) in the type ButtonBase is not applicable for the arguments (new EventHandler<ActionEvent>(){})
EventHandler cannot be resolved to a type
The method handle(ActionEvent) of type new EventHandler<ActionEvent>(){} must override or implement a supertype method
at simple.SimpleController.initialize(SimpleController.java:24)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at simple.Main.start(Main.java:26)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
Exception running application simple.Main
Let me know if you need to see the classes and FXML files (dw, they're very short)
Thank you!
PS- Please bear with me if I need clarification about your answer because as a Java newbie I often get confused!
EDIT 1:
package simple;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class SimpleController
implements Initializable {
#FXML // fx:id="myButton"
private Button myButton; // Value injected by FXMLLoader
#Override // This method is called by the FXMLLoader when initialization is complete
public void initialize(URL fxmlFileLocation, ResourceBundle resources) {
assert myButton != null : "fx:id=\"myButton\" was not injected: check your FXML file 'simple.fxml'.";
// initialize your logic here: all #FXML variables will have been injected
myButton.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("That was easy, wasn't it?");
}
});
}
}
You are missing the import for EventHandler, and you have the wrong import for ActionEvent. (Also you have imported ActionListener for some reason, though you never use it.)
Your imports should be
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
Looking at This Eclipse Bug it seems the Java Verifier (since 1.6) has had issues with ApsectJ.
The bug says AspectJ 1.8.1 will fix the problem. But using that with Java8u11 I still get the verify error.
I'm running JUnit4 under STS 3.6.0 (Eclipse 4.4). I believe this configuration is the very latest available of all packages.
Completely replaced the remainder of text with requested example. This seems to be limited to #Around advice. #Before works fine.
JUnit:
package com.test.aspectjdemo.junit;
import static org.junit.Assert.*;
import org.junit.Test;
import com.test.aspectjdemo.domain.AspectTarget;
public class AspectTargetTest {
#Test
public void testFirstMethod() throws Throwable {
AspectTarget aspectTarget = new AspectTarget();
aspectTarget.firstMethod();
}
}
Vmarg: -javaagent:C:....m2\repository\org\aspectj\aspectjweaver\1.8.1\aspectjweaver-1.8.1.jar
Class under test (I had some problems because proceed apparently declares it throws Throwable, which makes sense, but this simple test didn't throw anything. So I added a faux exception make it compile :
package com.test.aspectjdemo.domain;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class AspectTarget {
final Logger logger = LogManager.getLogger();
int x = 1;
public void firstMethod() throws Throwable {
logger.info("Start First Method");
x = secondMethod(x);
logger.info("Exit X is {}", x);
}
private int secondMethod(int x) throws Throwable {
logger.info("input is {}", x++);
if (x==100)
throw new RuntimeException();
return new Integer(x);
}
}
The Aspect:
package com.test.aspectjdemo.aspects;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
public aspect LoggingAspect {
static final Logger logger = LogManager.getLogger();
/**
* Exclude JUnit methods
*/
#Pointcut("!within(com.test.aspectjdemo.junit..*Test)")
public void noJunit() {}
#Pointcut("execution(* com.test.aspectjdemo.domain.*.*(..)) && noJunit()")
public void allMethods() { }
#Around("allMethods()")
public Object allmethods(ProceedingJoinPoint joinPoint) throws Throwable {
return joinPoint.proceed();
}
Finally once again the Error, which is actually thrown when the JUnit attempts to instantiate the AspectTarget (first line of testFirstMethod method).
java.lang.VerifyError: Bad type on operand stack
Exception Details:
Location:
com/test/aspectjdemo/domain/AspectTarget.secondMethod(I)I #23: invokestatic
Reason:
Type 'org/aspectj/lang/JoinPoint' (current frame, stack[2]) is not assignable to integer
Current Frame:
bci: #23
flags: { }
locals: { 'com/test/aspectjdemo/domain/AspectTarget', integer, integer, 'org/aspectj/lang/JoinPoint' }
stack: { 'com/test/aspectjdemo/domain/AspectTarget', integer, 'org/aspectj/lang/JoinPoint', 'com/test/aspectjdemo/aspects/LoggingAspect', null, 'org/aspectj/lang/JoinPoint' }
Bytecode:
0000000: 1b3d b200 4b2a 2a1c b800 51b8 0057 4e2a
0000010: 1c2d b800 6601 2db8 006a b800 6dac
at com.test.aspectjdemo.junit.AspectTargetTest.testFirstMethod(AspectTargetTest.java:13)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
The problem is that you mix native AspectJ syntax (public aspect LoggingAspect) with annotation-style #AspectJ syntax. I can reproduce the problem this way.
Correct #AspectJ syntax:
package com.test.aspectjdemo.aspects;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
#Aspect
public class LoggingAspect {
#Pointcut("!within(com.test.aspectjdemo.junit..*Test)")
public void excludeJUnit() {}
#Pointcut("execution(* com.test.aspectjdemo.domain.*.*(..)) && excludeJUnit()")
public void allMethods() {}
#Around("allMethods()")
public Object allmethods(ProceedingJoinPoint thisJoinPoint) throws Throwable {
System.out.println(thisJoinPoint);
return thisJoinPoint.proceed();
}
}
Correct native AspectJ syntax:
package com.test.aspectjdemo.aspects;
public aspect LoggingAspect {
pointcut excludeJUnit() :
!within(com.test.aspectjdemo.junit..*Test);
pointcut allMethods() :
execution(* com.test.aspectjdemo.domain.*.*(..)) && excludeJUnit();
Object around() : allMethods() {
System.out.println(thisJoinPoint);
return proceed();
}
}
I am completely new to jbehave and even automated testing.
I read a tutorial online and tried following the steps.
I am trying to run this application in eclipse IDE.
I made a Math.story file which contains the tests:
Scenario: 2 squared
Given a variable x with value 2
When I multiply x by 2
Then x should equal 4
In a .java file called ExampleSteps.java, the steps are written:
import org.jbehave.core.annotations.Given;
import org.jbehave.core.annotations.Named;
import org.jbehave.core.annotations.Then;
import org.jbehave.core.annotations.When;
import org.jbehave.core.steps.Steps;
public class ExampleSteps extends Steps {
int x;
#Given("a variable x with value $value")
public void givenXValue(#Named("value") int value) {
x = value;
}
#When("I multiply x by $value")
public void whenImultiplyXBy(#Named("value") int value) {
x = x * value;
}
#Then("x should equal $value")
public void thenXshouldBe(#Named("value") int value) {
if (value != x)
throw new RuntimeException("x is " + x + ", but should be " + value);
}
}
I created another class SimpleJbehave which has the main method:
import java.util.Arrays;
import java.util.List;
import org.jbehave.core.embedder.Embedder;
public class SimpleJBehave {
private static Embedder embedder = new Embedder();
private static List<String> storyPaths = Arrays
.asList("Math.story");
public static void main(String[] args) {
embedder.candidateSteps().add(new ExampleSteps());
embedder.runStoriesAsPaths(storyPaths);
}
}
When I run this code, I get the following exception:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/Transformer
at org.jbehave.core.configuration.Configuration.<init>(Configuration.java:112)
at org.jbehave.core.configuration.MostUsefulConfiguration.<init>(MostUsefulConfiguration.java:49)
at org.jbehave.core.embedder.Embedder.<init>(Embedder.java:30)
at org.jbehave.core.embedder.Embedder.<init>(Embedder.java:37)
at SimpleJBehave.<clinit>(SimpleJBehave.java:8)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more
As I am a novice, I have not been able to understand what exactly the problem is.
It will be really nice if someone could tell me what I should do to get this code working.
Is my approach wrong?
Thank you very much in advance.
It looks like you don't have org.apache.commons.collections.Transformer on your classpath. It looks like this class is available in the apache-commons-transformer library here: http://commons.apache.org/collections/api-release/org/apache/commons/collections/Transformer.html
Download the jar and add it to your classpath. It might work.
Question
Is there any way to deserialize JSON using the AutoBean framework such that the resulting bean has a type parameter that affects the type of one or more of its members?
Background
RPC with JSON results
I'm using GWT (RequestBuilder) to perform RPC requests. The JSON payload returned is of the following form:
{
"resultSet": [{...}, {...}, ...], // items requested; say, items 150-160
"totalCount": 15330 // total matching items in DB
}
The objects in resultSet vary in type depending on the specific RPC I'm calling.
AutoBean interface
I'd like to deserialize this JSON using AutoBean. I'm trying to represent this object as follows:
interface RpcResults<T> {
List<T> getResultSet();
void setResultSet(List<T> resultSet);
int getTotalCount();
void setTotalCount(int totalCount);
}
I've also created appropriate interfaces representing each type of object that could exist within resultSet. Finally, I set up the appropriate call to AutoBeanCodex.decode.
Running the code
Attempting to run this code in development mode causes the following stack trace to appear in the console:
19:44:23.791 [ERROR] [xcbackend] Uncaught exception escaped
java.lang.IllegalArgumentException: The AutoBeanFactory cannot create a java.lang.Object
at com.google.gwt.autobean.shared.AutoBeanCodex$Decoder.push(AutoBeanCodex.java:240)
at com.google.gwt.autobean.shared.AutoBeanCodex$Decoder.decode(AutoBeanCodex.java:50)
at com.google.gwt.autobean.shared.AutoBeanCodex$Decoder.visitCollectionProperty(AutoBeanCodex.java:83)
at com.citrix.xenclient.backend.client.json.RpcResultsAutoBean.traverseProperties(RpcResultsAutoBean.java:100)
at com.google.gwt.autobean.shared.impl.AbstractAutoBean.traverse(AbstractAutoBean.java:153)
at com.google.gwt.autobean.shared.impl.AbstractAutoBean.accept(AbstractAutoBean.java:112)
at com.google.gwt.autobean.shared.AutoBeanCodex$Decoder.decode(AutoBeanCodex.java:51)
at com.google.gwt.autobean.shared.AutoBeanCodex.decode(AutoBeanCodex.java:505)
at com.google.gwt.autobean.shared.AutoBeanCodex.decode(AutoBeanCodex.java:521)
at com.citrix.xenclient.backend.client.services.JSONResponseResultSetHandler.onResponseReceived(JSONResponseResultSetHandler.java:51)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
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:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
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:214)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
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:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
at java.lang.Thread.run(Thread.java:636)
Based on this stack trace, my hunch is the following:
Type erasure makes it seem that RpcResults.getResultSet() is returning a raw List.
The AutoBean deserialiser attempts to create Object instances for each item in resultSet.
Failure
Question again
Am I missing something in the AutoBean API that will allow me to do this easily? If not, is there an obvious point of attack I should look into? Is there a more sensible alternative for what I'm doing (other than JSONParser and JavaScriptObject, which I'm already using)?
This is not simple, due to Java type erasure. The type T does not exist at runtime, having been erased to Object in lieu of any other lower bound. The AutoBeanCodex requires type information in order to reify the elements of the incoming json payload. This type information is usually provided by the AutoBean implementation, but due to the T erasure, all it knows is that it contains a List<Object>.
If you can provide a class literal at runtime, the getter could be declared as Splittable getResultSet() and the individual elements of the list reified by calling AutoBeanCodex.decode(autoBeanFactory, SomeInterfaceType.class, getResultSet().get(index)). By using a Category, you could add a <T> T getResultAs(Class<T> clazz, int index) method to the AutoBean interface. This would look something like:
#Category(MyCategory.class)
interface MyFactory extends AutoBeanFactory {
AutoBean<ResultContainer> resultContainer();
}
interface ResultContainer<T> {
Splittable getResultSet();
// It's the class literal that makes it work
T getResultAs(Class<T> clazz, int index);
}
class MyCategory {
public static <T> T getResultAs(Autobean<ResultContainer> bean,
Class<T> clazz, int index) {
return AutoBeanCodex.decode(bean.getFactory(), clazz,
bean.as().getResultSet().get(index)).as();
}
}
Try overriding the .getResultSet() and .setResultSet() methods in your object-specific interfaces:
interface FooRpcResults extends RpcResults<Foo> {
#Override
List<Foo> getResultSet();
#Override
void setResultSet(List<Foo> value);
}
The following test works for me (GWT 2.3.0):
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import com.google.web.bindery.autobean.shared.AutoBean;
import com.google.web.bindery.autobean.shared.AutoBeanCodex;
import com.google.web.bindery.autobean.shared.AutoBeanFactory;
import com.google.web.bindery.autobean.shared.AutoBeanUtils;
import com.google.web.bindery.autobean.vm.AutoBeanFactorySource;
public class AutoBeanTest {
public static interface Page<T> {
int getDataSize();
List<T> getPage();
int getStartIndex();
void setDataSize(int value);
void setPage(List<T> value);
void setStartIndex(int value);
}
public static interface Thing {
String getName();
void setName(String value);
}
public static interface ThingFactory extends AutoBeanFactory {
AutoBean<Thing> createThing();
AutoBean<ThingPage> createThingPage();
}
public static interface ThingPage extends Page<Thing> {
#Override
List<Thing> getPage();
#Override
void setPage(List<Thing> value);
}
#Test
public void testAutoBean() {
final ThingFactory factory = AutoBeanFactorySource
.create(ThingFactory.class);
final Thing thing1 = factory.createThing().as();
thing1.setName("One");
final Thing thing2 = factory.createThing().as();
thing2.setName("Two");
final List<Thing> things = new ArrayList<Thing>();
things.add(thing1);
things.add(thing2);
final Page<Thing> page = factory.createThingPage().as();
page.setStartIndex(50);
page.setDataSize(1000);
page.setPage(things);
final String json = AutoBeanCodex.encode(
AutoBeanUtils.getAutoBean(page)).getPayload();
final Page<Thing> receivedPage = AutoBeanCodex.decode(factory,
ThingPage.class, json).as();
assertEquals(receivedPage.getStartIndex(), page.getStartIndex());
assertEquals(receivedPage.getDataSize(), page.getDataSize());
assertNotNull(receivedPage.getPage());
assertEquals(receivedPage.getPage().size(), page.getPage().size());
for (int i = 0; i < receivedPage.getPage().size(); i++) {
assertNotNull(receivedPage.getPage().get(i));
assertEquals(receivedPage.getPage().get(i).getName(), page
.getPage().get(i).getName());
}
}
}
Removing the overrides in the ThingPage interface will break it.
I have a problem with Eclipse when I use an RPC..
If I use a single method call it's all in the right direction but if I add a new method to handle the server I get the following error:
com.google.gwt.core.client.JavaScriptException: (null): null
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:237)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeBoolean(ModuleSpace.java:184)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeBoolean(JavaScriptHost.java:35)
at com.google.gwt.user.client.rpc.impl.RpcStatsContext.isStatsAvailable(RpcStatsContext.java)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:221)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
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:214)
at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
at java.lang.Thread.run(Thread.java:619)
Can I have more services in an asynchronous call right? Where am I wrong?
This is my implementation MyService:
package de.vogella.gwt.helloworld.client;
import com.google.gwt.user.client.rpc.RemoteService;
public interface MyService extends RemoteService {
//chiamo i metodi presenti sul server
public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann);
public void setWeb(String userCorrect,String query, String titolo,String snippet,String url);
}
MyServiceAsync
package de.vogella.gwt.helloworld.client;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface MyServiceAsync {
void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann,AsyncCallback<Void> callback);
void setWeb(String userCorrect,String query, String titolo,String snippet,String url, AsyncCallback<Void> callback);
}
RPCService:
package de.vogella.gwt.helloworld.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.ui.FlexTable;
public class RPCService implements MyServiceAsync {
MyServiceAsync service = (MyServiceAsync) GWT.create(MyService.class);
ServiceDefTarget endpoint = (ServiceDefTarget) service;
public RPCService()
{
endpoint.setServiceEntryPoint(GWT.getModuleBaseURL() + "rpc");
}
public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann,AsyncCallback callback)
{
service.creaXML(nickname, pass, email2, gio, mes, ann, callback);
}
public void setWeb(String userCorrect,String query, String titolo,String snippet,String url,AsyncCallback callback) {
service.setWeb(userCorrect,query, titolo,snippet,url,callback);
}
}
MyServiceImpl
package de.vogella.gwt.helloworld.server;
import java.io.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import de.vogella.gwt.helloworld.client.MyService;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.google.gwt.xml.client.Element;
import com.google.gwt.xml.client.NodeList;
public class MyServiceImpl extends RemoteServiceServlet implements MyService {
//metodo che inserisce il nuovo iscritto
public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann){
.......
}
public void setWeb(String userCorrect,String query, String titolo,String snippet,String url) {
.....
}
In the app in client-side I do
RPCService rpc2 = New RPCService()
rpc2.setWeb(..,...,...,...,callback);
and
RPCService rpc = New RPCService()
rpc.creaXML(..,...,...,...,callback); (in other posizions in the code...)
and..
AsyncCallback callback = new AsyncCallback()
{
public void onFailure(Throwable caught)
{
Window.alert("Failure!");
}
public void onSuccess(Object result)
{
Window.alert("Successoooooo");
}
};
Web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<!-- Servlets -->
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>De_vogella_gwt_helloworld.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>rPCImpl</servlet-name>
<servlet-class>de.vogella.gwt.helloworld.server.MyServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>rPCImpl</servlet-name>
<url-pattern>/de_vogella_gwt_helloworld/rpc</url-pattern>
</servlet-mapping>
</web-app>
Thank you all for your attention
Sebe
You seem to be invoking your RPC services in a strange way.
There is a tutorial in GWT web page showing how this should be done.
EDIT:
This bug reported in GWT bugs database may be related to your problem (the stack trace is very similar). Some information about the bug can be also found here.
I lost my pass and I recreate the account... I see your board..it's a problem with my browser web... If I use Internet Explorer it work fine, but If I use Firefox (my predefinite browser) throw the exception (but It compile fine). I have not found anything that I can fix it...