Question

我有以下案例

拦截器接口

@Inherited
@InterceptorBinding
@Documented
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface IErrorHandlerInterceptor {
    Car tyre() default Car.FOUR;
}

枚举类

 public enum Car{
        FOUR,FIVE;
    }

EJB无状态类

@ErrorHandlerInterceptor(tyre= Car.FIVE)
public List<?> getCarByName(String name) {
    ----------
    return List<?>;
}

的beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">
   <interceptors>
        <class>de.festado.interceptor.impl.ErrorHandlerInterceptor</class>
    </interceptors>
</beans>

拦截器实施

    @IErrorHandlerInterceptor
    @Interceptor
    public class ErrorHandlerInterceptor {

@AroundInvoke
public Object intercept(InvocationContext context) throws Exception {
    IErrorHandlerInterceptor ei = getClass().getAnnotation(IErrorHandlerInterceptor.class);
    String tyresNumber= ei.tyre().toString();
    try {
        return context.proceed();

    } catch(Exception e) {
        ....
    } finally {
        .....
    }
    return null;
}

现在我的问题：

每当我调用String tyresNumber= ei.tyre().toString();时，它只返回我在接口声明中设置的默认值。

我在这做错了什么？我忘了什么吗？

感谢您的帮助

Answer 1

这里的答案CDI interceptor does not work when annotation has parameter对我有很大帮助

IErrorHandlerInterceptor ei = getClass().getAnnotation(IErrorHandlerInterceptor.class);

getClass().getAnnotation(...)错了。正确的调用必须来自上下文

IErrorHandlerInterceptorei = context.getMethod().getAnnotation(IErrorHandlerInterceptor.class);

@Interceptor接口与枚举方法仅返回默认值

1 个答案: