Question

我正在使用aspectJ并遇到问题＆＃34; nullPointerException＆＃34;在jBoss6中，由于方面的建议没有得到应用。

我有一个多maven模块项目，每个模块如下所述分开。

＆＃34; maven - submodule1＆＃34;：

FieldAspect在maven子模块中定义 - ＆＃34; submodule1＆＃34;。

@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在同一个maven子模块中定义 - ＆＃34; submodule1＆＃34;。

<?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>

＆＃34;子模块1＆＃34;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>

＆＃34; maven - submodule2＆＃34;：

注释在maven子模块中描述如下所示 - 例如＆＃34;子模块2＆＃34;。

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

＆＃34; maven - submodule3＆＃34;：

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＆＃34; submodule3＆＃34;。

@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＆＃34;价值＆＃34;用＆＃34; Field＆＃34;注释在代码中使用＆＃34; andy＆＃34;应该是使用加载时间编织（LTW）应用的方面的输出，因为aspectjweaver-1.8.5被用作实现LTW的aspectj java代理。但是在多maven模块项目中没有发生这种情况，相反，我得到了nullPointerException。

有没有人可以帮我理解是否需要纠正切入点定义或者需要做任何特殊的事情来使这个例子有效。

非常感谢。

完成异常追踪：

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

Answer 1

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，只是为编织者提供了一些 aop.xml 设置来生成更多的日志输出，这样您就可以看到是否有任何建议被编织到您想要的连接点中。

我在JBoss6中收到错误java.lang.ExceptionInInitializerError，这应该与配置问题有关。

不，这与您抛出异常的建议有关。引用自己的代码：

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

ExceptionInInitializerError发生在静态初始化程序中，如JDK documentation中所述。显然，你在静态成员上使用@Field注释，例如我可以像这样重现这个例外：

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

你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会抛出异常？

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String，因此如果您声明任何类型为String的字段，例如

@Field
private int id;

您将收到此AspectJ编译错误：incompatible return type applying to field-get(...)

请修正您的宽高比代码，您的问题显然来自应用的方面。您认为未应用它的假设是错误的，否则ExceptionInInitializerError将不会发生。

AspectJ建议未在多maven模块中应用并在jBoss6中获取NullPointerException

1 个答案: