在尝试匹配之前必须设置 属性 'expression'

Question

当我试图解决这个问题时...

我面对

Must set property 'expression' before attempting to match

Answer 1

问题是，我在 @AfterThrowing 注释中没有切入点值：

错误

@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

@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 ，但我没有处理 class 加载程序问题...