spring - 在尝试匹配之前必须设置属性“表达式”

Question

当我试图解决这个SO 问题时......

我面对

Must set property 'expression' before attempting to match

Answer 1

问题是，我在@AfterThrowing注释中没有切入点的价值：

错误的

@AfterThrowing(throwing = "ex")
public void intercept(DataAccessException ex) throws Exception {
    //throw DatabaseException
    System.out.println("DAE");
    throw new IllegalArgumentException("DAE");
}

@AfterThrowing(throwing = "ex")
public void intercept(RuntimeException ex) throws Exception {
    //throw ServiceException
    System.out.println("RE - " + ex.getClass());
    throw new IllegalArgumentException("RE");
}

正确的

@AfterThrowing(pointcut = "execution(public * *(..))", throwing = "ex")
public void intercept(DataAccessException ex) throws Exception {
    //throw DatabaseException
    System.out.println("DAE");
    throw new IllegalArgumentException("DAE");
}

@AfterThrowing(pointcut = "execution(public * *(..))", throwing = "ex")
public void intercept(RuntimeException ex) throws Exception {
    //throw ServiceException
    System.out.println("RE - " + ex.getClass());
    throw new IllegalArgumentException("RE");
}

我发现的类似问题是AspectJExpressionPointcut 使用了错误的 classLoader，但我没有处理类加载器问题......