The web container automatically loads Java archive (JAR) files in the WEB-INF/lib folder of web application archive (WAR) files so that classes in those files are available to the application. In WebSphere Application Server traditional, the web container also automatically loads JAR files in subfolders of the WEB-INF/lib folder.

In Liberty, JAR files in subfolders of the WEB-INF/lib folder are not automatically loaded, and the application can get java.lang.NoClassDefFoundError exceptions at run time.

This rule detects JAR files in subfolders of the WEB-INF/lib folder. The View Result action shows the JAR files in the Package Explorer. To avoid exceptions in your application, move the JAR file to the WEB-INF/lib folder.