在'class com.sun.proxy.$Proxy398‘中没有名为“委托”的属性的getter

Question

当我在我的项目中添加阻断器时，我发现了一个错误，上面写着There is no getter for property named 'delegate' in 'class com.sun.proxy.$Proxy398'

详情如下：

        @Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class,
                Integer.class})
})

        StatementHandler statementHandler = (StatementHandler) invocation.getTarget();
 
        MetaObject metaObject = SystemMetaObject.forObject(statementHandler);

        //obtain mappedStatement
        MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");

错误发生在最新的代码中。

MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");

Answer 1

为什么会发生此错误。我试着找出加法和以前的区别。我发现项目中有一个相同类型的Intercepts Signature。

据我们所知，紫花莲插件会自行包装，所以解决它的方法就是获得最终的目标。

 StatementHandler statementHandler;
    Object expectedStatementHandler = invocation.getTarget();
    while (Proxy.isProxyClass(expectedStatementHandler.getClass())) {
        MetaObject metaObject = SystemMetaObject.forObject(expectedStatementHandler);
        //fastReturn
        if (BooleanUtils.isNotTrue(metaObject.hasGetter("h.target"))) {
            log.error("cant find mappedStatement h.get method");
            break;
        }
        expectedStatementHandler = metaObject.getValue("h.target");
    }
    //failFast
    if (!(expectedStatementHandler instanceof StatementHandler)) {
        log.error("sorry,expectedStatementHandler not instanceof StatementHandler!");
        return;
    }

    statementHandler = (StatementHandler) expectedStatementHandler;

    MetaObject metaObject = SystemMetaObject.forObject(statementHandler);

    MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");