NullPointerException if PhraseBuilder is @Stateless?
Hi everyone!
I got the examples to work for arquillian fairly painlessly. Great documentation, thank you!
In trying to incorporate it into our own project, though, I get bumping into:
java.lang.RuntimeException: java.lang.NullPointerException at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:154) at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:260) at org.jboss.weld.bean.proxy.EnterpriseBeanProxyMethodHandler.invoke(EnterpriseBeanProxyMethodHandler.java:111) at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56) at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:105) at maars.controller.calls.PhraseBuilder$Proxy$_$$_Weld$Proxy$.buildPhrase(PhraseBuilder$Proxy$_$$_Weld$Proxy$.java) at maars.controller.calls.Greeter.createGreeting(Greeter.java:21) at maars.controller.calls.GreeterTest.should_create_greeting(GreeterTest.java:29) 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:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:273) at org.jboss.arquillian.container.test.impl.execution.LocalTestExecuter.execute(LocalTestExecuter.java:60) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:116) at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67) at org.jboss.arquillian.container.test.impl.client.protocol.local.LocalContainerMethodExecutor.invoke(LocalContainerMethodExecutor.java:50) at org.jboss.arquillian.container.test.impl.execution.RemoteTestExecuter.execute(RemoteTestExecuter.java:109) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:116) at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67) at org.jboss.arquillian.container.test.impl.execution.ClientTestExecuter.execute(ClientTestExecuter.java:57) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:142) at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createTestContext(ContainerEventController.java:129) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:84) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:102) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:65) 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:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:111) at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:266) at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:229) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:317) at org.jboss.arquillian.junit.Arquillian.access$200(Arquillian.java:46) at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:243) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:188) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:317) at org.jboss.arquillian.junit.Arquillian.access$200(Arquillian.java:46) at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:202) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:150) 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:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.NullPointerException 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:606) at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:264) at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52) at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137) ... 102 more
I made it occur with some of the examples from the documentation if I mark PhraseBuilder as @Stateless. i.e.,
public class Greeter {
private PhraseBuilder phraseBuilder;
@Inject
public Greeter(PhraseBuilder phraseBuilder) {
this.phraseBuilder = phraseBuilder;
}
public void greet(PrintStream to, String name) {
to.println(createGreeting(name));
}
public String createGreeting(String name) {
return phraseBuilder.buildPhrase("hello", name);
}
}
@Stateless
public class PhraseBuilder {
private Map<String, String> templates;
public String buildPhrase(String id, Object... args) {
return MessageFormat.format(templates.get(id), args);
}
@PostConstruct
public void initialize() {
templates = new HashMap<String, String>();
templates.put("hello", "Hello, {0}!");
}
}
@RunWith(Arquillian.class)
public class GreeterTest {
@Inject
private Greeter greeter;
@Deployment
public static JavaArchive createDeployment() {
return ShrinkWrap.create(JavaArchive.class)
.addClasses(Greeter.class, PhraseBuilder.class)
.addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml");
}
@Test
public void should_create_greeting() {
Assert.assertEquals("Hello, Earthling!", greeter.createGreeting("Earthling"));
greeter.greet(System.out, "Earthling");
}
}
What's wrong with using @Stateless on PhraseBuilder to cause such a strange NPE?
If anyone has any ideas, I'd love to hear them. Thanks!
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GreeterTest.java 912 bytes
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PhraseBuilder.java 516 bytes
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Greeter.java 456 bytes