Tomcat 6.0中Spring应用程序的部署问题 [英] Deployment issues with Spring app in Tomcat 6.0
问题描述
我在将Tom Web应用程序部署到Tomcat 6.0时遇到问题。我想将一些jar部署到shared / lib(catalina.properties已正确配置);这些罐包含各种bean定义。部署到webapps目录的主应用程序使用:
< import resource =classpath *:com / ** / * .XML/>
获取部署到shared / lib的jar中的bean定义。
部署到shared / lib的一些bean已经更新,现在实现了MessageSourceAware接口;当应用程序现在启动时,我收到以下错误:
引起:java.lang.NoClassDefFoundError:org / springframework / context / MessageSourceAware
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass( ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java .net.URLClassLoader.access $ 000(URLClassLoader.java:58)
at java.net.URLClassLoader $ 1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass (ClassLoader.java:248)
at org.apache.catalina.loader.WebappClassLoader.loa dClass(WebappClassLoader.java:1667)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.springframework.util.ClassUtils.forName(ClassUtils.java: 257)
org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:408)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java: 1282)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1253)
... 72 more
引起:java.lang.ClassNotFoundException:org .springframework.context.MessageSourceAware
at java.net.URLClassLoader $ 1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net .URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.Cla ssLoader.loadClass(ClassLoader.java:248)
... 89更多
如果jar从shared / lib移动到应用程序的WEB-INF / lib目录,显然一切正常,但我想尽可能将jar保存在shared / lib中。
这看起来像一个类加载器问题,但是当Spring试图在shared / lib jar中创建bean时,WEB-INF / lib中的spring-context.jar是否已经加载了? / p>
我很困惑;任何帮助将不胜感激。
最终实现了shared / lib文件夹正是错误放置这些扩展jar的地方,因为Tomcat中类加载器的分层特性。
相反,我编写了自己的类加载器,扩展了Tomcat的WebappClassLoader:
公共类CustomWebappClassLoader扩展WebappClassLoader {
public CustomWebappClassLoader(){
super();
addCustomRepository();
}
public CustomWebappClassLoader(ClassLoader parent){
super(parent);
addCustomRepository();
}
private void addCustomRepository(){
String catalinaHome = System.getProperty(catalina.home);
File dir = new File(catalinaHome,String.format(extensions%slib,File.separator));
for(文件文件:dir.listFiles()){
if(file.getName()。endsWith(。jar)){
String repository = String.format(file :/%s,file.getAbsolutePath());
addRepository(repository);
}
}
}
}
这个将%CATALINA_HOME%/ extensions / lib中的任何jar添加到类路径中(以及应用程序的WEB-INF / classes和WEB-INF / lib)。
以下然后在context.xml中需要line:
< Loader loaderClass =com.test.CustomWebappClassLoaderdelegate =true />
I'm having problems deploying a Spring web app to Tomcat 6.0. I want to deploy some jars to the shared/lib (catalina.properties is correctly configured); these jars contain various bean definitions. The main application, deployed to the webapps directory, uses:
<import resource="classpath*:com/**/*.xml"/>
to pick up the bean definitions in the jars deployed to shared/lib.
Some of the beans deployed to shared/lib have been updated and now implement the MessageSourceAware interface; when the app now starts, I get the following error:
Caused by: java.lang.NoClassDefFoundError: org/springframework/context/MessageSourceAware
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1667)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:257)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:408)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1282)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1253)
... 72 more
Caused by: java.lang.ClassNotFoundException: org.springframework.context.MessageSourceAware
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 89 more
If the jars are moved from shared/lib to the WEB-INF/lib directory of the app, obviously everything works OK, but I'd like to keep the jars in shared/lib if at all possible.
This looks like a classloader issue, but hasn't the spring-context.jar in WEB-INF/lib already been loaded by the time Spring tries to create the beans in the shared/lib jars?
I'm confused; any help would be much appreciated.
Realised in the end that the shared/lib folder is exactly the wrong place to put these extension jars, owing to the hierarchical nature of the classloaders in Tomcat.
Instead, I wrote my own class loader that extends Tomcat's WebappClassLoader:
public class CustomWebappClassLoader extends WebappClassLoader {
public CustomWebappClassLoader() {
super();
addCustomRepository();
}
public CustomWebappClassLoader(ClassLoader parent) {
super(parent);
addCustomRepository();
}
private void addCustomRepository() {
String catalinaHome = System.getProperty("catalina.home");
File dir = new File(catalinaHome, String.format("extensions%slib", File.separator));
for (File file : dir.listFiles()) {
if (file.getName().endsWith(".jar")) {
String repository = String.format("file:/%s", file.getAbsolutePath());
addRepository(repository);
}
}
}
}
This adds any jars in %CATALINA_HOME%/extensions/lib to the classpath (along with WEB-INF/classes and WEB-INF/lib for the application).
The following line is then needed in context.xml:
<Loader loaderClass="com.test.CustomWebappClassLoader" delegate="true"/>
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