Tomcat 8类加载 - [WEB-INF / lib]和[tomcat / lib]中的JAR之间的区别 [英] Tomcat 8 classloading - difference between JAR in [WEB-INF/lib] and [tomcat/lib]

问题描述

这里说普通的类加载器是所有Web应用程序都可见。那么在我的 war 应用程序的 WEB-INF / lib 文件夹中有一个JAR文件和有什么区别Tomcat的 lib 文件夹中的相同JAR文件？

It says here that the common classloader is visible to all web application. So what is the difference between having a JAR file within the WEB-INF/lib folder of my war application and having the same JAR file within Tomcat's lib folder?

此JAR是我创建的Java SPI的提供程序。当我把它放在 WEB-INF / lib 下时，一切都很完美。但是，如果我尝试将此JAR置于Tomcat的 lib 文件夹下（或在 shared / lib 之后将其配置为 catalina.properties ）我收到错误。第二个选项对我来说更好，因为我需要完全解耦我的应用程序和提供程序。

This JAR is a provider for a Java SPI that I created. When I have it under WEB-INF/lib, everything works perfectly. But if I try to put this JAR under Tomcat's lib folder (or under shared/lib after configuring it in catalina.properties) I get errors. The second option is better for me because I need total decoupling of my application and the provider.

我得到的错误是 ClassNotFoundException 代表我的服务的接口（JAR实现的）。此接口位于第三个项目中，该项目是我的 war 应用程序的依赖项。

The error I get is a ClassNotFoundException for the interface that represents my service (which the JAR implements). This interface is in a third project, which is a dependency for my war application.

推荐答案

tomcat / lib 目录应该用于整个Web服务器的共享库和 WEB-INF / lib 仅适用于一个Web应用程序。

The tomcat/lib directory should be used for shared libraries for the whole web server and WEB-INF/lib only for one web application.

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