了解tomcat 6中的context.xml [英] Understanding context.xml in tomcat 6

问题描述

我在eclipse中创建了一个主要空的动态Web项目。

I created a mainly empty dynamic web project in eclipse.

它有

• 没有servlets


• 没有jsp文件

web.xml是

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>testprojekt</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

我添加了 context.xml 到其 META-INF 文件夹

<?xml version="1.0" encoding="UTF-8"?>
<Context>
        <Parameter name="companyName" value="My Company, Incorporated"  override="false"/>
</Context>

我将此项目导出为WAR文件。具有以下结构：

I exported this project as a WAR file. With the following structure:

user@system:$ tree
.
|-- META-INF
|   |-- MANIFEST.MF
|   `-- context.xml
`-- WEB-INF
    |-- classes
    |-- lib
    `-- web.xml

4 directories, 3 files

当我将项目部署到本地tomcat时（Apache Tomcat / 6.0.20） ）一切都按预期工作。这意味着，context.xml被复制到/ conf / Catalina / localhost并重命名为testprojekt.xml。

When I deploy the project to a local tomcat (Apache Tomcat/6.0.20) Everything works as expected. Meaning, the context.xml is copied to /conf/Catalina/localhost and renamed to testprojekt.xml.

当我将testprojekt.xml编辑为：

When I edit the testprojekt.xml to:

<?xml version="1.0" encoding="UTF-8"?>
<Context>
  <Parameter name="companyName" value="My BLAH Company, Incorporated"  override="false"/>
</Context>

我在catalina.out中看到以下输出：

I see the following output in the catalina.out:

02.11.2009 13:21:35 org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context [/testprojekt]
02.11.2009 13:21:35 org.apache.catalina.core.StandardContext resourcesStart
SCHWERWIEGEND: Error starting static Resources
java.lang.IllegalArgumentException: Document base /opt/tomcat6/webapps/testprojekt does not exist or is not a readable directory
        at org.apache.naming.resources.FileDirContext.setDocBase(FileDirContext.java:142)
        at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4048)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4217)
        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.check(HostConfig.java:1274)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:296)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
        at java.lang.Thread.run(Thread.java:619)
02.11.2009 13:21:35 org.apache.catalina.core.StandardContext start
SCHWERWIEGEND: Error in resourceStart()
02.11.2009 13:21:35 org.apache.catalina.core.StandardContext start
SCHWERWIEGEND: Error getConfigured
02.11.2009 13:21:35 org.apache.catalina.core.StandardContext start
SCHWERWIEGEND: Context [/testprojekt] startup failed due to previous errors
02.11.2009 13:21:35 org.apache.catalina.core.StandardContext stop
INFO: Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/testprojekt] has not been started

为什么？这是预期的结果吗？更改 context.xml 中参数的正确方法是什么？

Why is that? Is that the expected result? What is the right way to change parameters in a context.xml?

提前感谢您。
问候，

Thank you in advance. Regards,

推荐答案

我认为这是Tomcat中的一个错误。我提交了一份错误报告，但他们声称它按设计工作。 Tomcat有3种部署模式：Directory，WAR和Context Fragment。在你的情况下，它在重新加载时会感到困惑。

I think this is a bug in Tomcat. I filed a bug report but they claim it works as designed. Tomcat has 3 modes of deployment: Directory, WAR and Context Fragment. In your case, it gets confused when reloading.

这是导致错误的序列，

1. 部署WAR时，上下文片段（META-INF / context.xml）将复制到conf / Catalina / [host]目录。


2. 修改时片段，它正确地检测到更改，因此触发了重新部署。


3. 但是，它会忘记这是一个WAR部署并将其视为目录部署。该目录被取消删除，因此您收到错误。

如果您只更改META-INF中的XML，一切都应该适用于你。

If you only change the XML in META-INF, everything should work for you.

这篇关于了解tomcat 6中的context.xml的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！