我如何忽略超类？ [英] How can I ignore a superclass?

问题描述

我正在尝试为 java.util.logging api编写一个Web服务。所以我编写了一个继承自LogRecord的类MyLogRecord。我使用JAX-B注释注释了这个类，包括 @XmlAccessorType（XmlAccessType.NONE），因此它会忽略未注释的字段和属性。当我启动tomcat时，我收到 java.util.logging.Level 和其他 java.util.logging 的错误类没有默认构造函数，但是我的注释方法都没有对Level类或任何其他 java.util.logging 类进行任何引用。这些由父类引用。

I'm trying to write a web service for the java.util.logging api. So I wrote a class MyLogRecord that inherits from LogRecord. I annotated this class with JAX-B annotations, including @XmlAccessorType(XmlAccessType.NONE) so it would ignore non-annotated fields and properties. When I start up tomcat, I get errors that java.util.logging.Level and other java.util.logging classes do not have a default constructor, but none of my annotated methods make any reference to the Level class or any of the other java.util.logging classes. These are referenced by the parent class.

我的子类具有它需要定义的所有内容。如何让JAX-B完全忽略父类？

My sub-class has everything it needs defined. How can I get JAX-B to ignore the parent class completely?

更新：我发现另一个帖子时，建议修改父类。这显然是不可能的，因为我正在扩展 java.util 类。有没有办法在不修改超类的情况下做到这一点？

Update: I found another post on this, which suggests modifying the parent class. This is obviously not possible because I am extending a java.util class. IS there any way to do this without modifying the superclass?

Update2：我发现 java.net上的一个线程。该主题产生了增强请求，标记为另一个问题的副本，导致 @XmlTransient 注释。对这些错误报告的评论让我相信这在目前的规范中是不可能的。

Update2: I found a thread on java.net for a similar problem. That thread resulted in an enhancement request, which was marked as a duplicate of another issue, which resulted in the @XmlTransient annotation. The comments on these bug reports lead me to believe this is impossible in the current spec.

推荐答案

你需要标记父类@XmlTransient。由于父类在JRE中并且您无法修改，因此您需要一种备用机制。

You need to mark the parent class @XmlTransient. Since the parent class is in the JRE and cannot be modified by you, you need an alternate mechanism.

EclipseLink JAXB（MOXy）实现提供了一种表示元数据的方法作为您可以使用的XML：

The EclipseLink JAXB (MOXy) implementation offers a means of representing the metadata as XML that you could use:

http://wiki.eclipse.org/EclipseLink/Examples/MOXy/EclipseLink-OXM.XML

您可以指定一些使用注释的元数据，其余的作为XML。以下是您的文档的样子：

You can specify some of the metadata using annotations, and the rest as XML. Below is what your document would look like:

<java-types> 

    <java-type name="java.util.logging.LogRecord" xml-transient="true"/>

</java-types>

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