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我正在使用 aspectJ 并在 jBoss6 中遇到问题“nullPointerException”，因为没有应用方面的建议。

我有一个多 Maven 模块项目，每个模块都被分开，如下所述。

“maven - 子模块1”：

FieldAspect 下面是在 maven 子模块 - “submodule1”中定义的。

@Aspect
public abstract class FieldAspect {
@Pointcut
public abstract void getField();

@Pointcut
public abstract void setField();

@Around("getField()")
public String getFieldValue() {
return "Andy";
}
@Around("setField()")
public void setFieldValue() {
throw new RuntimeException();
}
}

相关的 aop.xml 定义在同一个 maven 子模块 - “submodule1”中。

<?xml version="1.0" encoding="UTF-8"?>
<aspectj>
<aspects>
<concrete-aspect name="main.java.aop.field.MyFieldAspect" extends="main.java.aop.field.FieldAspect">
<pointcut name="getField" expression="get(@main.java.aop.field.Field * *)" />
<pointcut name="setField" expression="set(@main.java.aop.field.Field * *)" />
</concrete-aspect>
</aspects>
</aspectj>

“submodule1”的 pom.xml 包含以下条目。

<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.2</version>
</dependency>

<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<configuration>
<complianceLevel>1.6</complianceLevel>
<source>1.6</source>
<target>1.6</target>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>

“maven - submodule2”：

注释在 Maven 子模块中描述如下所示 - 比如说“submodule2”。

@Target({ ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Field {
}

“maven - submodule3”：

在另一个 maven 子模块中描述了一个带有上述注释的字符串字段 - 比如“submodule3”。

@Field
private String value;

我正在 jBosss 6 中部署这个多 Maven 模块并尝试运行该应用程序。当在代码中使用带有“Field”注释的“value”时，“andy”应该是输出，因为应该使用加载时间编织 (LTW) 应用切面，因为aspectjweaver-1.8.5它用作实现 LTW 的切面 Java 代理。但这在多 maven 模块项目中并没有发生，而是在nullPointerException.

任何人都可以帮助我了解是否需要更正定义的切入点或需要做任何特殊的事情来使这个例子工作。

非常感谢。

完整的异常跟踪：

java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method) [:1.7.0_67]
at java.lang.Class.forName(Class.java:270) [:1.7.0_67]
at org.jboss.ejb3.jndi.deployers.metadata.SessionBeanTypeWrapper.<init>(SessionBeanTypeWrapper.java:62) [:0.1.7]
at sun.reflect.GeneratedConstructorAccessor171.newInstance(Unknown Source) [:1.7.0_67]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [:1.7.0_67]
at java.lang.reflect.Constructor.newInstance(Constructor.java:526) [:1.7.0_67]
at org.jboss.reflect.plugins.introspection.ReflectionUtils.newInstance(ReflectionUtils.java:154) [jboss-reflect.jar:2.2.1.SP1]
at org.jboss.reflect.plugins.introspection.ReflectConstructorInfoImpl.newInstance(ReflectConstructorInfoImpl.java:102) [jboss-reflect.jar:2.2.1.SP1]
at org.jboss.joinpoint.plugins.BasicConstructorJoinPoint.dispatch(BasicConstructorJoinPoint.java:81) [jboss-reflect.jar:2.2.1.SP1]
at org.jboss.aop.microcontainer.integration.AOPConstructorJoinpoint.dispatch(AOPConstructorJoinpoint.java:109) [jboss-aop-mc-int.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.KernelControllerContextAction$JoinpointDispatchWrapper.execute(KernelControllerContextAction.java:257) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.ExecutionWrapper.execute(ExecutionWrapper.java:47) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchExecutionWrapper(KernelControllerContextAction.java:125) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchJoinPoint(KernelControllerContextAction.java:72) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.InstantiateAction.installActionInternal(InstantiateAction.java:67) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:54) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:42) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:379) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:2044) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:1083) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.executeOrIncrementStateDirectly(AbstractController.java:1322) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1246) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1139) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:894) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:641) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(BeanMetaDataDeployer.java:182) [:2.2.2.GA]
at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(BeanMetaDataDeployer.java:58) [:2.2.2.GA]
at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:63) [:2.2.2.GA]
at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:55) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:179) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1832) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1550) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1571) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1603) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1491) [:2.2.2.GA]
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:379) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:2044) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:1083) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.executeOrIncrementStateDirectly(AbstractController.java:1322) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1246) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1139) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:939) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:654) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.deployers.plugins.deployers.DeployersImpl.change(DeployersImpl.java:1983) [:2.2.2.GA]
at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:1076) [:2.2.2.GA]
at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:679) [:2.2.2.GA]
at org.jboss.system.server.profileservice.deployers.MainDeployerPlugin.process(MainDeployerPlugin.java:106) [:6.1.0.Final]
at org.jboss.profileservice.dependency.ProfileControllerContext$DelegateDeployer.process(ProfileControllerContext.java:143) [:0.2.2]
at org.jboss.profileservice.dependency.ProfileDeployAction.deploy(ProfileDeployAction.java:151) [:0.2.2]
at org.jboss.profileservice.dependency.ProfileDeployAction.installActionInternal(ProfileDeployAction.java:94) [:0.2.2]
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:54) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:42) [jboss-kernel.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:379) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:2044) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:1083) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.executeOrIncrementStateDirectly(AbstractController.java:1322) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1246) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1139) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:939) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:654) [jboss-dependency.jar:2.2.0.SP2]
at org.jboss.profileservice.dependency.ProfileActivationWrapper$BasicProfileActivation.start(ProfileActivationWrapper.java:190) [:0.2.2]
at org.jboss.profileservice.dependency.ProfileActivationWrapper.start(ProfileActivationWrapper.java:87) [:0.2.2]
at org.jboss.profileservice.dependency.ProfileActivationService.activateProfile(ProfileActivationService.java:215) [:0.2.2]
at org.jboss.profileservice.dependency.ProfileActivationService.activate(ProfileActivationService.java:159) [:0.2.2]
at org.jboss.profileservice.bootstrap.AbstractProfileServiceBootstrap.activate(AbstractProfileServiceBootstrap.java:112) [:0.2.2]
at org.jboss.profileservice.resolver.BasicResolverFactory$ProfileResolverFacade.deploy(BasicResolverFactory.java:87) [:0.2.2]
at org.jboss.profileservice.bootstrap.AbstractProfileServiceBootstrap.start(AbstractProfileServiceBootstrap.java:91) [:0.2.2]
at org.jboss.system.server.profileservice.bootstrap.BasicProfileServiceBootstrap.start(BasicProfileServiceBootstrap.java:132) [:6.1.0.Final]
at org.jboss.system.server.profileservice.bootstrap.BasicProfileServiceBootstrap.start(BasicProfileServiceBootstrap.java:56) [:6.1.0.Final]
at org.jboss.bootstrap.impl.base.server.AbstractServer.startBootstraps(AbstractServer.java:827) [jboss-bootstrap-impl-base.jar:2.1.0-alpha-6]
at org.jboss.bootstrap.impl.base.server.AbstractServer$StartServerTask.run(AbstractServer.java:417) [jboss-bootstrap-impl-base.jar:2.1.0-alpha-6]
at java.lang.Thread.run(Thread.java:745) [:1.7.0_67]
Caused by: java.lang.NullPointerException
4

1 回答 1

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我尝试了解决方案，但没有得到结果。

哪种解决方案？我没有建议任何解决方案，只是为编织器提供了一些aop.xml设置以生成更多日志输出，这样您就可以查看是否有任何建议被编织到您想要的连接点中。

我java.lang.ExceptionInInitializerError在 JBoss6 中遇到错误，这应该与配置问题有关。

不，这与您的建议引发异常有关。引用自己的代码：

@Around("setField()")
public void setFieldValue() {
    throw new RuntimeException();
}

如JDK 文档ExceptionInInitializerError中所述，它发生在静态初始化程序中。所以很明显你在静态成员上使用了注释，例如我可以像这样重现异常：@Field

@Field
private static String someStaticMember = "dummy value";

那里有一个带有初始化程序的静态成员。那么，为什么在设置字段值时抛出异常呢？

您的其他切入点/建议还有一个问题：

@Around("getField()")
public String getFieldValue() {
    return "Andy";
}

此建议始终返回 a String，因此如果您声明任何非类型的字段，String例如

@Field
private int id;

你会得到这个 AspectJ 编译错误：incompatible return type applying to field-get(...)

请修复您的方面代码，您的问题显然来自正在应用的方面。您认为未应用它的假设是错误的，否则ExceptionInInitializerError不会发生。

于 2015-02-09T20:07:02.543 回答