Java:哪个 Apache Digester 类? [英] Java: Which Apache Digester Class?

问题描述

我正在支持一个无法启动的 Web 应用程序/Java servlet.结果证明该问题是一个相对简单的 java.lang.NoClassDefFoundError 异常，由 org.apache.webapp.balancer.RulesParser 抛出.

I'm supporting a web application / Java servlet that has been failing to start. The issue turns out to be a relatively straight-forward java.lang.NoClassDefFoundError exception, thrown by org.apache.webapp.balancer.RulesParser.

抛出异常的过滤器类期望包中存在Digester类:

The filter class that throws the exception expects the Digester class to exist in the package:

org/apache/tomcat/util/digester

应用程序库中似乎不存在该包，但在以下位置有该类的实例:

That package doesn't appear to exist in the application lib, but there is an instance of the class in:

org/apache/commons/digester

这是我们当前应用程序/项目的的一部分.这两个类都扩展了 org.xml.sax.helpers.DefaultHandler 所以我假设它们是同一个类(但可能不同的日期/版本)?

Which is part of our current application / project. Both of the classes extend org.xml.sax.helpers.DefaultHandler so I'm assuming they are the same class (but probably different dates / versions)?

catalina-balancer.jar中存在RulesParser类(我没有源码)，所以不能直接改包导入.

The RulesParser class exists in the catalina-balancer.jar (I don't have the source), so I can't change the package import directly.

该课程的最新版本是什么，我应该使用哪个版本(以及如何使用)?

What is the later version of the class and which version should I be using (and how)?

推荐答案

您要查找的类位于 Tomcat 文件夹中.%TOMCAT_HOME%/server/lib/tomcat-util.jar 确保你没有覆盖默认的类路径/加载器，也没有忘记在 Tomcat 目录中添加

The class you are looking for is in the Tomcat folder. %TOMCAT_HOME%/server/lib/tomcat-util.jar Make sure you haven't overridden the default classpath/loader and forgot to add in the Tomcat directories

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