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If a Library from the Library Manager is added to a Java Class Library project and then in turn the Java Class Library Project is added to another project then the Library is not added to the classpath of the resulting project 1. Library (in Library Manager) | | (add Library to a Java Class Library project) V 2. Java Class Library project | | (add the Java Class Library Project to the Java Web Application) V Java Web Application (Java Class Library classes added to the classpath) (Library from step 1. is not included in the classpath) Result is a compilation failure for the Java Web Application. The workaround is to also add the Library to the Java Web Application
*** This issue has been marked as a duplicate of 47507 ***