Question

当我尝试使用ajc编译器弹簧aspectj时，我得到跟随errror.when我正在删除aspectj然后代码工作正常编译时编织有什么导致问题

caused by: java.lang.ExceptionInInitializerError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:100)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)
... 31 more
Caused by: java.lang.NullPointerException
at com.cdf.dfdxc.aspect.logging.LoggingAspect.logEntry(LoggingAspect.java:76)
at com.cdfc.fdged.uow.UdfdFactory.<clinit>(UOWfdy.java:1)

Spring bean文件

<bean id="hibernateCertificateDao" class="com.Add.exasmple2.dao.HibernateCertificateDaoImpl" autowire="byType">
    <property name="hibernateTemplate">
        <ref bean="hibernateTemplate" />
    </property>
</bean>

<bean id="AddCert" class="com.Add.exasmple2.uow.AddCertUOW" lazy-init="true" autowire="byType">
    <constructor-arg ref="oXMapper"></constructor-arg>
</bean>

<bean id="uOWFactoryBean" class="com.Add.exasmple2.uow.UOWFactory" />

<bean id="businessProcessManager" class="com.Add.exasmple2.infrastructure.BusinessProcessManager"></bean>

<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate" >
    <property name="sessionFactory">
        <ref bean="sessionFactory" />
    </property>
</bean>

类路径：/资源/休眠的映射

<bean id="exampleDataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName">
        <value>com.ibm.db2.jcc.DB2Driver</value>
    </property>
    <property name="url">
        <value>jdbc:db2://20.15.29.108:50001/XC128086</value>
    </property>
    <property name="password">
        <value>db2dut$</value>
    </property>
    <property name="username">
        <value>db2dut</value>
    </property>
</bean>

<bean id="exampleHibernateProperties"
    class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="properties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.DB2Dialect</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.current_session_context_class">org.hibernate.context.ThreadLocalSessionContext
            </prop>
            <prop key="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider
            </prop>
            <prop key="c3p0.acquire_increment">3</prop>
            <prop key="c3p0.max_size">30</prop>
            <prop key="c3p0.min_size">3</prop>
            <prop key="c3p0.max_statements">0</prop>
            <prop key="c3p0.idle_test_period">0</prop>
            <prop key="c3p0.timeout">0</prop>
            <prop key="current_session_context_class">thread</prop>
            <prop key="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</prop>
            <prop key="connection.autocommit">true</prop>
            <prop key="show_sql">false</prop>
            <prop key="format_sql">false</prop>
            <prop key="use_sql_comments">false</prop>
            <prop key="hibernate.show_sql">false</prop>
        </props>
    </property>
</bean>



<tx:annotation-driven transaction-manager="transactionManager" />


<bean id="transactionManager"
    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory">
        <ref bean="sessionFactory" />
    </property>
</bean>

记录方面代码

  @Pointcut("within(com.csc.exceed.uow.*)")
public void loggingAspect() {

}

// invoked before the method execution
@Before("loggingAspect()")
public void logEntry(JoinPoint joinPoint) {

    Class<? extends Object> clazz = joinPoint.getTarget().getClass();
    String name = joinPoint.getSignature().getName();

    if (ArrayUtils.isEmpty(joinPoint.getArgs())) {
        if (!(name.startsWith("get")) || (name.startsWith("set")))
            logger.log(LogLevel.INFO, clazz, null, BEFORE_STRING, name,
                    constructArgumentsString(clazz, joinPoint.getArgs()));
    } else {

        logger.log(LogLevel.INFO, clazz, null, BEFORE_WITH_PARAMS_STRING,
                name, constructArgumentsString(clazz, joinPoint.getArgs()));

    }
}

Answer 1

如果不知道第76行是什么就很困难：

at com.cdf.dfdxc.aspect.logging.LoggingAspect.logEntry(LoggingAspect.java:76)

但你正在使用非常激进的切入点

@Pointcut("within(com.csc.exceed.uow.*)")
public void loggingAspect() {}

这匹配所有类型的事件，不仅包括方法执行，还包括静态和实例初始化，字段访问等（请参阅AspectJ Quick Reference中的原始切入点概述）。

如果其中任何一个：

为null返回joinPoint.getTarget()，此行会抛出一个NPE：

Class<? extends Object> clazz = joinPoint.getTarget().getClass();

为null返回joinPoint.getSignature()，此行会抛出一个NPE：
```
String name = joinPoint.getSignature().getName();
```

此外，您在这里检查null或空args：

if (ArrayUtils.isEmpty(joinPoint.getArgs())) {
    if (!(name.startsWith("get")) || (name.startsWith("set")))
        logger.log(LogLevel.INFO, clazz, null, BEFORE_STRING, name,

但你仍在使用args：

            constructArgumentsString(clazz, joinPoint.getArgs()));

这也可能会引发NPE，具体取决于constructArgumentsString()

检查第76行中发生了哪些，并且您的候选人失败了。但我的第一个提示是用execution或call切入点替换你的攻击式全能切入点。

我会使用以模块化方式定义的组合切入点：

// you can easily reuse this
@Pointcut("within(com.csc.exceed.uow.*)")
public void myApp() {}

// and this
@Pointcut("execution(* *.*(..))")
public void methodExecution(){}

// but this is the pointcut you are actually matching
@Pointcut("myApp() && methodExecution()")
public void methodExecutionInMyApp(){}

@Before("methodExecutionInMyApp()")
public void logMethodExecutions(JoinPoint jp){
    // your code here
}

以下是如何让班级对NPE安全：

Class<?> clazz = joinPoint.getTarget() !=null 
               ? joinPoint.getTarget().getClass() 
               : null;

使用Ajc编译器和Spring问题AspectJ

1 个答案: