Tomcat: Java. Lang. classnotfoundexception

1.Warning: Failed to register in JMX: javax. Naming. namingexception: cocould not load resource factory class [root exception is Java. Lang. classnotfoundexception: org. Apache. commons. DBCP. basicdatasourcefactory]

2.Caused by: Java. Lang. noclassdeffounderror: ORG/Apache/commons/pool/impl/genericobjectpool

I encountered this error today, but finally found the answer on the Internet, the main is a package is not imported in, in addition to the need for commons-dbcp.jar but also need to commons-pool.jar this package, import the following commons-pool.jar package into c: \ Program Files \ Apache Software Foundation \ Tomcat 6.0 \ Lib.

Summary: When you see classnotfoundexception, noclassdeffounderror, and so on, there is basically a lack of packages. Just import the corresponding packages.