NullPointer與Arquillian CDI測試

我想從this tutorial運行一個簡單的CDI測試。以下是我的JUNIT和POM。不知道錯誤是什麼。感謝任何幫助。NullPointer與Arquillian CDI測試

ERROR

java.lang.NullPointerException 
    at com.aravind.jee6.cdi.basic.GreeterTest.greet(GreeterTest.java:32) 
    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:601) 
    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.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:270) 
    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:601) 
    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:135) 
    at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115) 
    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:120) 
    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:601) 
    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:135) 
    at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115) 
    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:601) 
    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:601) 
    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:89) 
    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:601) 
    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:75) 
    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:601) 
    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: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:601) 
    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:135) 
    at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:111) 
    at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:263) 
    at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:226) 
    at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314) 
    at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46) 
    at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:240) 
    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.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:185) 
    at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314) 
    at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46) 
    at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:199) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 
    at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:147) 
    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)

JUNIT

@RunWith(Arquillian.class) 
public class GreeterTest 
{ 
    @Inject 
    Greeter greeter; 

    @Deployment 
    public static JavaArchive createDeployment() 
    { 
     JavaArchive jar = ShrinkWrap.create(JavaArchive.class).addClass(Greeter.class) 
       .addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml"); 
     System.out.println(jar.toString(true)); 
     return jar; 
    } 

    @Test 
    public void greet() 
    { 
     assertEquals("Hello, CDI", greeter.createGreeting("CDI")); 
    } 
}

POM

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <groupId>com.aravind.jee6</groupId> 
    <artifactId>cdi-basic-di</artifactId> 
    <version>1.0</version> 
    <name>CDI Basic dependency injection</name> 
    <dependencyManagement> 
     <dependencies> 
      <dependency> 
       <groupId>org.jboss.arquillian</groupId> 
       <artifactId>arquillian-bom</artifactId> 
       <version>1.0.3.Final</version> 
       <scope>import</scope> 
       <type>pom</type> 
      </dependency> 
     </dependencies> 
    </dependencyManagement> 
    <build> 
     <plugins> 
      <plugin> 
       <artifactId>maven-compiler-plugin</artifactId> 
       <version>2.3.2</version> 
       <configuration> 
        <source>1.7</source> 
        <target>1.7</target> 
       </configuration> 
      </plugin> 
      <plugin> 
       <artifactId>maven-surefire-plugin</artifactId> 
       <version>2.12</version> 
      </plugin> 
     </plugins> 
    </build> 
    <dependencies> 
     <dependency> 
      <groupId>org.jboss.arquillian.junit</groupId> 
      <artifactId>arquillian-junit-container</artifactId> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>4.11</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.arquillian.container</groupId> 
      <artifactId>arquillian-weld-ee-embedded-1.1</artifactId> 
      <version>1.0.0.CR3</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.weld</groupId> 
      <artifactId>weld-core</artifactId> 
      <version>1.1.5.Final</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>slf4j-simple</artifactId> 
      <version>1.6.4</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.jboss.spec</groupId> 
      <artifactId>jboss-javaee-6.0</artifactId> 
      <version>1.0.0.Final</version> 
      <type>pom</type> 
      <scope>provided</scope> 
     </dependency> 
    </dependencies> 
</project>

來源

2013-04-29 Aravind R. Yarram

當你通過mvn install（而不是通過eclipse）在命令行中時它能正確運行嗎？ – 2013-04-29 14:34:20

@JohnAment號我和mvn也有同樣的例外。 – 2013-04-29 14:37:08

你能從maven輸出中發佈確切的異常嗎？你發送的一個eclipse運行包裹在它裏面。 – 2013-04-29 14:41:08

回答自己是爲了他人的利益。 Inject類是通過eclipse自動導入的（Ctrl + Shift + O）並且它來自與javax.inject不同的包。

來源

2013-04-30 15:08:17

有2個顯著點，如下所示： -

JUnit Test Case應該用@RunWith(Arquillian.class)進行配置/註釋。
CDI injection應該放在@Deployment之後。

然後適當JUnit test case應按照下列規定執行： -

@RunWith(Arquillian.class) 
public class GreeterTest 
{ 

    @Deployment 
    public static JavaArchive createDeployment() 
    { 
     JavaArchive jar = ShrinkWrap.create(JavaArchive.class).addClass(Greeter.class) 
       .addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml"); 
     System.out.println(jar.toString(true)); 
     return jar; 
    } 

    @Inject 
    Greeter greeter; 

    @Test 
    public void greet() 
    { 
     assertEquals("Hello, CDI", greeter.createGreeting("CDI")); 
    } 
}

我希望這可以幫助。

來源

2013-04-29 04:55:19

點＃2是沒有必要的。 '@ Inject'字段可以放在任何適合作爲注入點的位置。 – 2013-04-29 08:42:39

實際上有@RunWith（Arquillian.class）用於測試。它只是在從IDE複製/粘貼期間錯過了它。 – 2013-04-29 13:36:27

NullPointer與Arquillian CDI測試

回答

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