java apache-tomcat 6.0.20 中的共享 jars
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Shared jars in apache-tomcat 6.0.20
提问by zbigh
I'm pretty new to JWS.
我对 JWS 很陌生。
I have a web application ( several web services ) that I want to deploy using tomcat 6.0.20 on a linux system.
我有一个 web 应用程序（几个 web 服务），我想在 linux 系统上使用 tomcat 6.0.20 进行部署。
Everything's ok if I generate a .war file with all used libraries inside and put it in the webapps directory, but I want to have these jars shared, and the .war file itself is way too big.
如果我生成一个包含所有使用过的库的 .war 文件并将其放在 webapps 目录中，一切都可以，但是我想共享这些 jar，而 .war 文件本身太大了。
First I tried the intuitive way - I created a link ( WEB-INF/lib ) to the directory containing the jars, but strangely it fails to deploy ( it starts if the directory is not a link ):
首先，我尝试了直观的方法 - 我创建了一个指向包含 jars 的目录的链接（WEB-INF/lib），但奇怪的是它无法部署（如果目录不是链接，它会启动）：
SEVERE: Error configuring application listener of class com.sun.xml.ws.transport.http.servlet.WSServletContextListener
java.lang.ClassNotFoundException: com.sun.xml.ws.transport.http.servlet.WSServletContextListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3877)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:630)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:556)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:491)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
After that I created the $CATALINA_HOME/shared/lib directory, and moved the jars there ( I've deleted the WEB-INF/lib ) and it still displays the same error - it seems tomcat isn't looking for the jars anywhere else than the WEB-INF/lib directory. But on the other hand - why would creating a symbolic link make any difference?
之后我创建了 $CATALINA_HOME/shared/lib 目录，并将罐子移到那里（我已经删除了 WEB-INF/lib ）它仍然显示相同的错误 - 似乎 tomcat 没有在其他任何地方寻找罐子比 WEB-INF/lib 目录。但另一方面 - 为什么创建符号链接会有什么不同？
My CATALINA_HOME and JRE_HOME vars seems to be right.
我的 CATALINA_HOME 和 JRE_HOME 变量似乎是正确的。
采纳答案by TofuBeer
Did you try putting the shared jar files in $CATALINA_HOME/lib? It says that ". Normally, application classes should NOT be placed here" but sounds like you would actually want to in your case.
您是否尝试将共享的 jar 文件放在$CATALINA_HOME/lib 中？它说“。通常，应用程序类不应该放在这里”，但听起来你实际上想要在你的情况下。
The $CATALINA_HOME/shared/lib seems to be gone in 6.0 (it was there in 5.5).
$CATALINA_HOME/shared/lib 似乎在 6.0 中消失了（它在 5.5 中存在）。
回答by Arnold Reuser
To add a bit more detail on this.
对此添加更多细节。
- The metro project uses the shared class loader to make it possible to expose libraries to all webapps that you deploy.
- The metro project uses the endorsed library mechanism of Tomcat to update your standard java distribution
- Metro 项目使用共享类加载器来向您部署的所有 web 应用程序公开库。
- Metro 项目使用 Tomcat 的背书库机制来更新您的标准 java 发行版
Shared Class loader
共享类加载器
Shared resources are shared across all web applications and not used by Tomcat internal classes.If Tomcat 6 requires a shared library. Adjust $CATALINA_HOME/conf/catalina.properties and set shared.loader=${catalina.home}/shared/lib/*.jar
共享资源在所有 Web 应用程序之间共享，并且不被 Tomcat 内部类使用。如果 Tomcat 6 需要共享库。调整 $CATALINA_HOME/conf/catalina.properties 并设置 shared.loader=${catalina.home}/shared/lib/*.jar
Endorsed libraries
认可的图书馆
To update the java platform and incorporate a new version of a given library, included in the standard distribution, one can add the library to /lib/endorsed or set the system wide property java.endorsed.dirs If Tomcat 6 requires an endorsed library. Several strategies can be used to incorporate the required endorsed library
要更新 java 平台并合并包含在标准发行版中的给定库的新版本，可以将库添加到 /lib/endorsed 或设置系统范围的属性 java.endorsed.dirs 如果 Tomcat 6 需要认可库。可以使用多种策略来合并所需的背书库
- add the given library to java-home/lib/endorsed
- set the Tomcat command line parameter -Djava.endorsed.dirs
- use the default directory $CATALINA_HOME/endorsed; see /bin/setclasspath.sh or /bin/setclasspath.bat
- set system wide parameter JAVA_ENDORSED_DIRS
- 将给定的库添加到 java-home/lib/endorsed
- 设置Tomcat命令行参数-Djava.endorsed.dirs
- 使用默认目录 $CATALINA_HOME/endorsed；见 /bin/setclasspath.sh 或 /bin/setclasspath.bat
- 设置系统范围的参数 JAVA_ENDORSED_DIRS
回答by Pascal Thivent
In Tomcat 6, the content of $CATALINA_HOME/libwill be made available to the "Common" class loader (see http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html). The shared/libdirectory that Tomcat 5.5 used to have no long exist.
在 Tomcat 6 中， 的内容$CATALINA_HOME/lib将提供给“ Common”类加载器（参见http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html）。shared/libTomcat 5.5 以前的目录已经不存在了。
However, I'd like to know what jars you are trying to put there exactly as the case of JAX-WS (or Metro) is "special". Also, what JDK are you using?
但是，我想知道您正试图将哪些罐子放在那里，因为 JAX-WS（或 Metro）的情况是“特殊的”。另外，你用的是什么JDK？
Update:As I said, the case of Metro is a bit special. To install it, copy webservices-rt.jar, webservices-tools.jar, webservices-extra.jar, webservices-extra-api.jar in $CATALINA_HOME/lib. But webservices-api.jar and jsr173_api.jar should go in $CATALINA_HOME/endorsed. Actually, this is what the metro-on-tomcat.xmlant script provided in the metro distribution does (and I would recommend to mimic it).
更新：正如我所说，Metro 的情况有点特殊。要安装它，请将 webservices-rt.jar、webservices-tools.jar、webservices-extra.jar、webservices-extra-api.jar 复制到$CATALINA_HOME/lib. 但是 webservices-api.jar 和 jsr173_api.jar 应该进去$CATALINA_HOME/endorsed。实际上，这就是metro-on-tomcat.xmlMetro 发行版中提供的ant 脚本所做的（我建议模仿它）。
