无法将PrimeFaces添加为EAR的库

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问题描述

我想在我的Java EE 6（Jboss AS 7.1.1Final）应用程序中使用PrimeFaces具有以下结构：

I'd like to use PrimeFaces in my Java EE 6 (Jboss AS 7.1.1Final) application with this structure:

EAR
|- lib/
|    |- primefaces-4.0.jar
|
|- ejb-module.jar
|- webbapp1.war
|- webapp2.war

然而，在部署到JBoss AS 7时，我遇到了几个例外情况，例如：

However, when deploying to JBoss AS 7, I'm getting several exceptions such as:

java.lang.LinkageError: Failed to link org/primefaces/context/PrimeFacesContextFactory

（请参阅完整堆栈跟踪）

(Please see the full stack trace here on PasteBin)

对于EAR的pom。 xml，我正在使用PrimeFaces的Maven依赖：

For EAR's pom.xml, I'm using this Maven dependency for PrimeFaces:

    <dependency>
    <groupId>org.primefaces</groupId>
    <artifactId>primefaces</artifactId>
    <version>4.0</version>
    <type>jar</type>
</dependency>

然而，当我将依赖项放入一个WAR的pom.xml中时，它可以工作，但我想要在多个WAR之间共享primefaces库。

However, when I put the dependency into pom.xml of one WAR, it works, but I want to share the primefaces library between multiple WARs.

我已经google了很多但是没有找到任何解决方案。谢谢你的任何建议。

I've googled a lot but have not found any solution. Thank you for any advice.

推荐答案

你不能。 Webapp库不属于 EAR / lib ，但在 WAR / WEB-INF / lib 中。 EAR / lib 永远不会被用作EAR所有WAR项目的共享库。这仅适用于EAR的所有EJB项目（业务服务）。

You cannot. Webapp libraries do not belong in EAR/lib, but in WAR/WEB-INF/lib. The EAR/lib is never intented as a "shared library" for all WAR projects of the EAR. It's that only for all EJB projects (the business services) of the EAR.

PrimeFaces上的 LinkageError - 您所面临的特定类是由于（默认）特定于webapp的库（如JSF API / impl）不可用于 EAR / lib 所使用的类加载器。这会导致 EAR / lib 中的所有库在 WAR / WEB-INF / lib 中具有（虚拟）依赖关系失败，类加载错误，如 LinkageError 。

The LinkageError on a PrimeFaces-specific class which you're facing is caused because the (default) webapp-specific libraries like JSF API/impl are not available to the classloader as used by EAR/lib. This causes all libraries in the EAR/lib which have a (virtual) dependency in WAR/WEB-INF/lib to fail with class loading errors like LinkageError.

如果你真的需要一个所有WAR的共享库项目，那么你最好的选择是将库放在Java EE容器本身（就像默认情况下已经为JSF API / impl库完成的那样）。在JBoss的情况下，这被称为模块。但是我不建议这样做，因为这使得webapp不能跨容器移植，而不需要通过serveradmin专门配置容器。只需为每个webapp提供一组自己的webapp库。

If you really really need a "shared library" for all WAR projects, then your best bet is putting the library in Java EE container itself (like as by default already done for JSF API/impl libraries). In case of JBoss, that's called a "module". I however wouldn't recommend that as that makes the webapp unportable across containers without specifically configuring the container by the serveradmin. Just give each webapp its own set of webapp libraries.

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