General solutions for java.lang.ClassNotFoundException under MAVEN projects

There are a lot of changes on the Web. Class. Project's trouble sometimes doesn't necessarily work. The following method is appropriate for a project with a jar already referenced. But the execution is classnotfound, please try for example:

Severity: Error Configuring Application Listener of Class Org.springframework.web.context.ContextLoaderListenerjava.lang.ClassNotFoundException: Org.springframework.web.context.ContextLoaderListenerat Org.apache.catalina.loader.WebappClassLoader.loadClass ( webappclassloader.java:1678) at Org.apache.catalina.loader.WebappClassLoader.loadClass (Webappclassloader.java : 1523) at Org.apache.catalina.core.DefaultInstanceManager.loadClass (defaultinstancemanager.java:415) at Org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(defaultinstancemanager.java:397) at Org.apache.catalina.core.DefaultInstanceManager.newInstance ( defaultinstancemanager.java:118) at Org.apache.catalina.core.StandardContext.listenerStart (Standardcontext.java : 4660) at Org.apache.catalina.core.standardcontext$1.call (standardcontext.java:5226) at Org.apache.catalina.core.standardcontext$1.call (standardcontext.java:5221) at java.util.concurrent.futuretask$ Sync.innerrun (futuretask.java:303) at Java.util.concurrent.FutureTask.run (futuretask.java:138) at Java.util.concurrent.threadpoolexecutor$worker.runtask (threadpoolexecutor.java:886) at Java.util.concurrent.threadpoolexecutor$worker.run (threadpoolexecutor.java:908) at Java.lang.Thread.run ( thread.java:662)

Issue Background :

Project is in the Spring-web-3.1.0.release.jar package for the Mavenproject,contextloaderlistener class. The pom.xml of Maven was checked, and the dependency was introduced properly.

In the Projectmaven dependencies view, it is also possible to see the Spring-web-3.1.0.release.jar package being introduced in the normal.

Cause of Error:

Enter the deployment path to Tomcat. Metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ under the check, After you discover that project deployment has not generated a Lib folder under the Web-inf folder, it normally generates a Lib folder and deploys all of project's dependent jar packages to that folder.

How to resolve:

1. Right click on the project-select Properties

Select Deployment Assembly, click AddButton on the right, and select Java Build Path in the popup form Entries

2. Click Next. Choose Maven Dependencies

3. Click Finish to see that maven dependencies has been added to the Web application structure.

Once you're done, deploy project again. No more error. And then we go to the. metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ folder, and found that the Projectweb-inf folder in the active generation of the Lib folder, And all of the dependent jar packages are already deployed. The problem is therefore resolved.

General solutions for java.lang.ClassNotFoundException under MAVEN projects