Develop Reference

Unsupported Class Version during Maven build in Jenkins

I've seen a few of these questions on here, but none of the solutions/tips seem to be pointing me in the right direction. So I have 3 JDK's installed in the locations of "/opt/java/6", "/opt/java/7", and "/opt/java/8". All of these are set in the global Jenkins configuration. Jenkins itself is run using Java 8 which is the system default JRE that I set manually through alternatives (I'm using CentOS 7). I had a bunch of old projects that are built using maven and the maven compiler plugin which is set to source=1.6 target=1.6 . Every time I try to execute a build with the Java 6 JDK I get
Started by user Antony Prince
ln builds/lastSuccessfulBuild /var/lib/jenkins/jobs/BitCalculator/lastSuccessful failed
java.nio.file.DirectoryNotEmptyException: /var/lib/jenkins/jobs/BitCalculator/lastSuccessful
at sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:242)
at sun.nio.fs.AbstractFileSystemProvider.deleteIfExists(AbstractFileSystemProvider.java:108)
at java.nio.file.Files.deleteIfExists(Files.java:1165)
at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at hudson.Util.createSymlinkJava7(Util.java:1194)
at hudson.Util.createSymlink(Util.java:1112)
at hudson.model.Run.createSymlink(Run.java:1851)
at hudson.model.Run.updateSymlinks(Run.java:1832)
at hudson.model.Run.execute(Run.java:1743)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:529)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)
ln builds/lastStableBuild /var/lib/jenkins/jobs/BitCalculator/lastStable failed
java.nio.file.DirectoryNotEmptyException: /var/lib/jenkins/jobs/BitCalculator/lastStable
at sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:242)
at sun.nio.fs.AbstractFileSystemProvider.deleteIfExists(AbstractFileSystemProvider.java:108)
at java.nio.file.Files.deleteIfExists(Files.java:1165)
at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at hudson.Util.createSymlinkJava7(Util.java:1194)
at hudson.Util.createSymlink(Util.java:1112)
at hudson.model.Run.createSymlink(Run.java:1851)
at hudson.model.Run.updateSymlinks(Run.java:1833)
at hudson.model.Run.execute(Run.java:1743)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:529)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)
Building in workspace /var/lib/jenkins/workspace/BitCalculator
> git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
> git config remote.origin.url /home/git/repositories/java/BitCalculator.git # timeout=10
Fetching upstream changes from /home/git/repositories/java/BitCalculator.git
> git --version # timeout=10
> git fetch --tags --progress /home/git/repositories/java/BitCalculator.git +refs/heads/*:refs/remotes/origin/*
> git rev-parse origin/master^{commit} # timeout=10
Checking out Revision 4f119f7783cc4ff00e5bf9bb27850ae7698d4fe8 (origin/master)
> git config core.sparsecheckout # timeout=10
> git checkout -f 4f119f7783cc4ff00e5bf9bb27850ae7698d4fe8
> git rev-list 4f119f7783cc4ff00e5bf9bb27850ae7698d4fe8 # timeout=10
Parsing POMs
[BitCalculator] $ /opt/java/6/bin/java -Djava.awt.headless=true -cp /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-agent-1.5.jar:/usr/share/maven/boot/plexus-classworlds.jar org.jvnet.hudson.maven3.agent.Maven3Main /usr/share/maven /var/lib/jenkins/war/WEB-INF/lib/remoting-2.44.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-1.5.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-commons-1.5.jar 56445
<===[JENKINS REMOTING CAPACITY]===>channel started
Executing Maven: -B -f /var/lib/jenkins/workspace/BitCalculator/pom.xml -P sign clean deploy
java.lang.reflect.InvocationTargetException
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.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:331)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:178)
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 hudson.maven.Maven3Builder.call(Maven3Builder.java:134)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:69)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:328)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.UnsupportedClassVersionError: javax/inject/Provider : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
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 org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:386)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:86)
... 22 more
channel stopped
[BitCalculator] $ /bin/sh -xe /tmp/hudson6524656470722686910.sh
+ rm 'target/*no_deps*'
rm: cannot remove 'target/*no_deps*': No such file or directory
Build step 'Execute shell' marked build as failure
ERROR: Failed to parse POMs
hudson.util.IOException2: java.lang.reflect.InvocationTargetException
at hudson.maven.Maven3Builder.call(Maven3Builder.java:178)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:69)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:328)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.reflect.InvocationTargetException
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 hudson.maven.Maven3Builder.call(Maven3Builder.java:134)
... 10 more
Caused by: java.lang.Exception: java.lang.reflect.InvocationTargetException
at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:181)
... 15 more
Caused by: java.lang.reflect.InvocationTargetException
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.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:331)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:178)
... 15 more
Caused by: java.lang.UnsupportedClassVersionError: javax/inject/Provider : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
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 org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:386)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:86)
... 22 more
Archiving artifacts
Sending e-mails to: antony#blazrsoft.com
Finished: FAILURE
This indicates that there's Java 7 interfering somewhere, but I'm not sure where.
The code is 1.6 compliant and most of the projects have no dependencies, so I'm not sure why this is happening. If I execute maven outside of Jenkins, the projects build just fine with JDK 6, so its leading me to think there's a misconfiguration in Jenkins somewhere, but I'm not sure where since everything seems to be as it should be. The paths to the JDKs are set properly in the global config and the projects themselves are set to use the specified JDK's. I apologize if its a duplicate question or something silly, but I've been trying to figure this out for days with no results. Everyone just says to check the paths and make sure there are no dependent artifacts built with a later JDK and I'm sure that this is not the problem.
$ mvn -version
Apache Maven 3.0.5 (Red Hat 3.0.5-16)
Maven home: /usr/share/maven
Java version: 1.8.0_20, vendor: Oracle Corporation
Java home: /opt/java/8/jre
Default locale: en_US, platform encoding: ANSI_X3.4-1968
OS name: "linux", version: "2.6.32-openvz-042stab090.5-amd64", arch: "amd64", family: "unix"
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<encoding>UTF-8</encoding>
<source>1.6</source>
<target>1.6</target>
<compilerVersion>1.6</compilerVersion>
</configuration>
</plugin>

You have an old java version. For example in my case I´m compiling an old product so I have to keep the java deprecated version.
So the solution was to download a newest jdk and configure the JAVA_HOME in the slave.
http://lmarccdk12.ptx.fr.sopra:14000/computer//configure in the section Advanced/JavaPath=/root/jdk1.7.0_79/bin/java (that´s the version I chose)
You will see the following message in the slave launch log:
[SSH] Starting slave process: cd "/root" && /root/jdk1.7.0_79/bin/java -jar slave.jar

Your Jenkins job is of type "Maven project", and this job type has a limitation in that it cannot run a Maven build with a JDK version that is older than the Java version under which Jenkins is run.
Beginning with Jenkins 2.357 (released on June 28, 2022) and the forthcoming 2.361.1 LTS release, Jenkins requires Java 11 or newer. Therefore, you can no longer run Maven projects with JDKs 1.6, 1.7 and 1.8. The minimum version is now Java 11.
To resolve this, you may:
Create a Freestyle project and use Invoke top-level Maven targets to invoke Maven, or create a Jenkins Pipeline project. In both cases, using an older JDK will be possible.
Use JDK 11 but set source and target version to the older Java version. I haven't tried that though, and I believe this option may cause other trouble.
For further information, see also Jenkins requires Java 11 or newer and Maven Builds Fails After Upgrade

Deploying web app using Ant results in NoClassDefFoundError

I'm using Ant 1.9.3 and Tomcat version 8.0. I'm using the Ant deploy target to deploy web apps in the Apache Tomcat using the manager credentials. The deploy target fails with the following exception:
java.lang.NoClassDefFoundError:
org/apache/tomcat/util/codec/binary/Base64
at org.apache.catalina.ant.AbstractCatalinaTask.execute(AbstractCatalina
Task.java:204)
at org.apache.catalina.ant.DeployTask.execute(DeployTask.java:196)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.jav
a:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExe
cutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
at org.apache.tools.ant.Main.runBuild(Main.java:851)
at org.apache.tools.ant.Main.startAnt(Main.java:235)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.codec.binary
.Base64
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 19 more
When I tried to find the class Base64 in the package org\apache\tomcat\util\codec\binary\ which is in tomcat-util.jar, and it is in the classpath which I've verified by an echo in Ant build file.
I'm not able to solve the issue.

Just in case someone runs into the same problem I was having:
I was following the tutorial on the Tomcat website and I ran into the same NoClassDefFoundError issue when I tried to run ant install.
The tutorial mentions that you have to copy $CATALINA_HOME/lib/catalina-ant.jar1 (which contains the implementation code for the Ant custom tasks) to the lib directory of your Ant installation.
It does not mention, however, that you need to do the same thing for tomcat-util.jar. As soon as I copied tomcat-util.jar to my Ant directory, things started working (source).
1$CATALINA_HOME is the directory of your Tomcat installation, e.g. /usr/share/tomcat8

Please make sure you have added the tomcat-util.jar in the classpath as below.
<path id="catalina-ant-classpath">
<!-- We need the Catalina jars for Tomcat -->
<!-- * for other app servers - check the docs -->
<fileset dir="${appserver.lib}">
<include name="catalina-ant.jar"/>
<include name="tomcat-util.jar"/>
</fileset>
</path>

liferay hook deployment - event class not found exception

I create a hook plugin with liferay-sdk-6.0.6 and define a servlet.service.events.pre event handler :
<service>
<service-type>servlet.service.events.pre</service-type>
<service-impl>com.ggd543.liferay.ServicePreAction</service-impl>
</service>
When i deploy it onto liferay-6.0.6-ce bundled jboss 5.1.0 GA, I got the following error:
Caused by: java.lang.ClassNotFoundException: application.startup.events
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)
at com.liferay.portal.deploy.hot.HookHotDeployListener.doInvokeDeploy(HookHotDeployListener.java:569)
at com.liferay.portal.deploy.hot.HookHotDeployListener.invokeDeploy(HookHotDeployListener.java:218)
... 68 more
Is there any wrong in my liferay-hook.xml ?

Yes. From Liferay 6 you dont define events like that in liferay-hook.xml. You have to create property hook and define your event in the property file. Some thing like below
liferay-hook.xml
<hook>
<portal-properties>portal.properties</portal-properties>
</hook>
portal.properties
servlet.service.events.pre=com.ggd543.liferay.ServicePreAction

java.lang.NoClassDefFoundError: org/apache/axis2/client/Stub

I've added a Web Service using Axis2 to my project and now I can't run my application.
This is the classpath I am using:
<property name="classpath" location="bin:EventReservationCore/bin:EventReservationCore/db:EventReservationCore/lib/*:EventReservationCore/lib/util_iso2.jar:EventReservationCore/lib/sqlitejdbc-v056.jar:AuthorizationRMI/lib/AuthorizationService.jar:EventReservationCore/lib/activemq-all-5.4.3.jar:/home/ander/axis2-1.6.1/webapp/axis2.war"/>
And this is the target that runs until I add the Axis2 Web Service.
<target name="run.besocial">
<java classname="eventReservationServer.ReservationEventServer" classpath="${classpath}" fork="true">
<jvmarg value="-Djava.rmi.server.codebase=file:EventReservationCore/bin/ file:EventReservationCore/lib/util_iso2.jar"/>
<jvmarg value="-Djava.security.policy=EventReservationCore/java.policy" />
</java>
</target>
As a result I get this error:
[java] Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/axis2/client/Stub
[java] at java.lang.ClassLoader.defineClass1(Native Method)
[java] at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
[java] at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
[java] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
[java] at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
[java] at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
[java] at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
[java] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
[java] at eventReservationServer.eventServerGateway.WSEventServerGateway.getEvents(WSEventServerGateway.java:19)
[java] at eventReservationServer.ReservationEventServer.<init>(ReservationEventServer.java:101)
[java] at eventReservationServer.ReservationEventServer.main(ReservationEventServer.java:130)
[java] Caused by: java.lang.ClassNotFoundException: org.apache.axis2.client.Stub
[java] at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
[java] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
[java] ... 15 more

If you are using tomcat, copy all the jar files located under axis2/lib folder to the tomcat/lib folder and also add them to the classpath like this D:\axis2-1.6.2\lib*

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/axis2/client/Stub
Above error can be removed by adding axis2-kernel-1.6.2 to the class path, but you might start getting other errors after you have generated the stubs with wsdl2java.bat.
So you better add all the axis2-jars to classpath while compiling the client.
Hope this helps

None of the answers helped me. Here is then what I did.
I used eclipse to generate Runnable Jar(right click->Export->Runnable Jar) with all the libraries added as package.
It gave me a JAR that I could run from command line.
Then I did diff between Jar from eclipse and Jar that my build created. I was able to find the missing dependencies that my build was not putting in Jar.

If you faced the same issue for JBoss class loader, follow the tips on here and here.
The most important part is to define a new module in JBoss module configurations, and also locate the module in you MANIFEST.MF file.
Maven will help you to do the later part. Following is a sample configuration to add axis module to your Manifest file.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ejb-plugin</artifactId>
<configuration>
<archive>
<manifestEntries> <!--Manually added JBoss Modules (that are not found by JBoss class loader) must be loaded here-->
<Dependencies>axis.axis</Dependencies>
</manifestEntries>
</archive>
</configuration>
</plugin>
Depending to your packaging type, you would use other maven plugins like maven-jar-plugin or maven-war-plugin.
The dependency package name must match the name that you have specified to your module name in JBoss modules. The above axis module is defined in JBoss models as explained in the links above.
<module xmlns="urn:jboss:module:1.1" name="axis.axis">
<properties>
<property name="jboss.api" value="private"/>
</properties>
<!-- ... -->
</module>

Log4jConfigListener cannot be found -- context fails to start

I am trying to set up a web application on Eclipse. I am using Tomcat 6.0 and jdk 1.6.0_23.
For some reason I am getting this error:
SEVERE: Error configuring application listener of class org.springframework.web.util.Log4jConfigListener
java.lang.ClassNotFoundException: org.springframework.web.util.Log4jConfigListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4078)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
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:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Jan 24, 2011 11:44:08 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Error configuring application listener of class org.springframework.web.context.ContextLoaderListener
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4078)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
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:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
I checked if all libraries have been added to the build path and everything seems correct. log4j-1.2.15.jar is included and all the necessary spring libraries.
I am very confused as to what the problem especially because the project was working fine in another computer. Any help with this problem will be highly appreciated.
Naftal

Reticulogic's second suggestion is correct. However, in Eclipse Helios, the "Java EE Module Dependencies" option has been removed. The fix for Helios is as follows:
Right click on your project in Eclipse and go to Properties-->Deployment Assembly
Click "Add..."
Select "Java Build Path Entries" and click "Next"
select "Maven Dependencies" and click "Finish"

The org.springframework.web.util.Log4jConfigListener class is definitely not in your classpath.
The first thing I would suggest is that you turn up the logging level in Tomcat -- in the conf folder -- to "ALL" or "DEBUG" so that you can see exactly what is going on in the container that is preventing this class from being found.
Second, I'd recommend you check your JAR files for the missing class file by running grep, if on linux/mac:
# run at the root of your lib folders:
grep -ri "org.springframework.web.util.Log4jConfigListener" *
The above command will return all JAR files that contain that package. Once the JAR file is isolated, then you can further troubleshoot.
Third, make sure you don't have any conflicts. Multiple versions of Log4j being in your classpath will wreak havoc. How is the system supposed to know which org.springframework.web.util.Log4jConfigListener package to load if there are 2 of them? Tomcat has 3 different classpath folders:
shared/lib
lib
webapps/yourapp/WEB-INF/lib
Make sure you have only one log4j JAR file in only one of these folders.

A simple solution is to clean the Tomcat directory in Eclipse. It worked for me.

If you are using maven and eclipse
1) Look in your web project .classpath file. If you have a classpath entry "org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER", then make sure the attribute is there as well.
<classpathentry kind="con" path="org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
</attributes>
</classpathentry>
2) If that does not work, then right click on your web project in eclipse and go to Properties-->JavaEE Module dependencies. Make sure the Maven Dependencies box is checked.
Then save, build deploy yada yada

Migrating to log4j2?
Don't forget to check your webapp/WEB-INF/web.xml (Web Application Deployment Descriptor) for extraneous Event Listener definitions.

If you use, log4j2, you can find these classes in
org.apache.logging.log4j.web.*
package.

As you can see from the class name org.springframework.web.util.Log4jConfigListener is part of spring framework.
And it was depricated since spring 4.2.1 . So check your spring version.