When I configure the connection pool (with commons-dbcp-1.2.1), put the mysql's JDBC driver package in a web-inf / lib directory.
Tomcat starts the error, saying is ClassNotFound "Org.gjt.mm.mysql.driver"
Later, I found below in Tomcat-DOCS:
DBCP Uses The Jakarta-Commons Database Connection Pool. It Relies on Number of Jakarta-Commons Componsenets:
JAKARTA-Commons DBCP 1.0 Jakarta-Commons Collections 2.0 Jakarta-Commons Pool 1.0
Thase Jar Files Along With Your The Jar File for your JDBC Driver Should Be Installed in $ Catalina_Home / Common / lib.
Note: Third Party Drivers Should Be in Jarfiles, Not Zipfiles. Tomcat Only Adds $ CATALINA_HOME / COMMON / LIB / *. JAR TO The ClassPath.
NOTE: Do not install these jarfiles in your / WEB-INF / lib, or $ JAVA_HOME / jre / lib / ext, or anywhere else You will experience problems if you install them anyplace other than $ CATALINA_HOME / common / lib..
I found that learning Java should be entangled for many times on the details of these configuration issues, I hope to get better in the future.
