这是出错提示信息：typeExceptionreportmessagedescriptionTheserverencounteredaninternalerror()thatpreventeditfromfulfillingthisrequest.exceptionjavax.servlet.ServletExcepti...
这是出错提示信息：type Exception reportmessagedescriptionThe server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource"root cause javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource"note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 3.1.1 logs.谁能解释下到底是什么原因？
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