Common classes deployed in a .jar

[adamw]

Hello,
I have a web application (deployed as a .war) and some common classes, which I would like to deploy separately - as a jar. But this does not work - and I suppose ClassLoaders are an issue, or rather my lack of understanding them. However, it's quite weird.
If I deploy only the .war, then when I try to access some "common" classes I get a ClassNotFoundException.
If I deploy both the .war and the .jar, then I get a NoClassDefFoundError

Why is that? How can I achieve my goal?

Thanks,
Adam

[azhurakousky]

When you say you deploy both .war and .jar where do you put .jar?

Oleg

[adamw]

Hello,
I put them both in the deploy directory.

--
Cheers,
Adam

[jaikiran]

ClassNotFoundException and NoClassDefFoundError are two different things are have different meaning. Post the exception stack trace that you are seeing. When you see the NoClassDefFoundError, it may be a case that even the classes in the .jar file(which you placed in the deploy directory) are found by the classloader, there might be other classes/jars which this class is dependent on and which may not be in the classpath.
The exception stacktrace will help in identifying the exact reason

[jaikiran]

Read this

When you see the NoClassDefFoundError, it may be a case that even the classes in the .jar file

as

When you see the NoClassDefFoundError, it may be a case that even though the classes in the .jar file

[adamw]

So here are the stack traces in all 3 scenarios:

1. The .jar is in the WEB-INF/lib directory of the .war - everything works
2. The .jar is in the deploy directory, "parallel" to the .war (I though for a while that this was beacuse of deploy order, but I tried changing the names so that the .war goes first and then the .jar, and the other way ruond, but the effect is the same):

08:32:58,359 ERROR [[fileAccessServlet]] Servlet.service() for servlet fileAccessServlet threw exception
java.lang.NoClassDefFoundError: org/jboss/forge/fileaccess/DownloadsFileAccessMonitor : org/jboss/shotoku/fileaccess/FileAccessMonitor
 at java.lang.ClassLoader.defineClass(Ljava.lang.String;[BIILjava.security.ProtectionDomain;)Ljava.lang.Class;(Unknown Source)
 at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
 at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
 at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
 at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at org.jboss.mx.loading.RepositoryClassLoader.findClassLocally(RepositoryClassLoader.java:672)
 at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:652)
 at java.lang.ClassLoader.loadClass(Ljava.lang.String;Z)Ljava.lang.Class;(Unknown Source)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassLocally(RepositoryClassLoader.java:190)
 at org.jboss.mx.loading.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:131)
 at org.jboss.mx.loading.LoadMgr3.nextTask(LoadMgr3.java:399)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:517)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:405)
 at java.lang.ClassLoader.loadClass(Ljava.lang.String;Z)Ljava.lang.Class;(Unknown Source)
 at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:580)
 at java.lang.ClassLoader.loadClass(Ljava.lang.String;)Ljava.lang.Class;(Unknown Source)
 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1339)
 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
 at java.lang.ClassLoader.loadClassFromNative(Ljava.lang.String;)Ljava.lang.Class;(Unknown Source)
 at java.lang.Class.forName(Ljava.lang.String;ZLjava.lang.ClassLoader;)Ljava.lang.Class;(Unknown Source)
 at java.lang.Class.forName(Ljava.lang.String;I)Ljava.lang.Class;(Unknown Source)
 at org.jboss.shotoku.fileaccess.FileAccessConfiguration.<init>(FileAccessConfiguration.java:35)
 at org.jboss.shotoku.fileaccess.FileAccessConfigurationWatcher.getConfiguration(FileAccessConfigurationWatcher.java:37)
 at org.jboss.shotoku.fileaccess.FileAccessConfigurationWatcher.init(FileAccessConfigurationWatcher.java:42)
 at org.jboss.shotoku.fileaccess.FileAccessConfigurationWatcher.init(FileAccessConfigurationWatcher.java:18)

3. The .jar is not present at all, so the classes are simply not there:

08:53:16,108 ERROR [FileAccessServlet] Error loading a file access monitor.
java.lang.ClassNotFoundException: org.jboss.forge.fileaccess.TempFilesFileAccessMonitor
 at java.lang.Class.forName(Ljava.lang.String;ZLjava.lang.ClassLoader;)Ljava.lang.Class;(Unknown Source)
 at java.lang.Class.forName(Ljava.lang.String;I)Ljava.lang.Class;(Unknown Source)
 at org.jboss.shotoku.fileaccess.FileAccessConfiguration.<init>(FileAccessConfiguration.java:35)
 at org.jboss.shotoku.fileaccess.FileAccessConfigurationWatcher.getConfiguration(FileAccessConfigurationWatcher.java:37)
 at org.jboss.shotoku.fileaccess.FileAccessConfigurationWatcher.init(FileAccessConfigurationWatcher.java:42)
 at org.jboss.shotoku.fileaccess.FileAccessConfigurationWatcher.init(FileAccessConfigurationWatcher.java:18)
 at org.jboss.shotoku.cache.ShotokuCacheItem.get(ShotokuCacheItem.java:107)
 at org.jboss.shotoku.fileaccess.FileAccessServlet.doGet(FileAccessServlet.java:57)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run()V(Unknown Source)

--
Cheers and thanks for the help,
Adam