用JDBC直接连接数据库 ok 没问题
可是用tomcat连接 就抛出异常 我用的Eclipse6.0 tomcat6.0 Oracle9i tomcat连接数据库连接池都配置好了
请高手指点 我错在哪里 我的AddMessageServlet.java:76的代码是connection.close()//关闭连接
可是好像connection就没创建才会报错的。。。
严重: Servlet.service() for servlet AddMessageServlet threw exception
java.lang.NullPointerException
at guestbook.AddMessageServlet.doPost(AddMessageServlet.java:76)
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:233)
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:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
