jsp和 mysql连接代码出现的问题

org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet LoginServlet threw exception
java.lang.ClassFormatError: Catch type in exception table has bad constant type in class file com/mysql/jdbc/StringUtils
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:270)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at dataBase.DBConn.<init>(DBConn.java:21)
	at dataBase.loginDaoTemp.queryByName(loginDaoTemp.java:22)
	at Servlet.LoginServlet.doPost(LoginServlet.java:100)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
	at java.lang.Thread.run(Unknown Source)

追问：刚设置好了！又有了新的问题，真是纠结！什么意思啊！

答案：应该是找不到你的mysql驱动包的路径，你可能需要设置mysql驱动包的ClassPath

其他：java.lang.ClassFormatError 把：com/mysql/jdbc/StringUtils和Servlet 的代码发出来看看是不是这个里面出问题了。

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