Question

用MyEclipse 自带的tomcat不报错，使用tomcat8报错错误如下

java.lang.ClassNotFoundException: sun.jdbc.odbc.JdbcOdbcDriver
java.lang.NullPointerException
java.lang.ClassNotFoundException: sun.jdbc.odbc.JdbcOdbcDriver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1333)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1180)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:259)
at myBean.ConnectManager.Connect(ConnectManager.java:15)
at myBean.goodsList1.doPost(goodsList1.java:32)
at myBean.goodsList1.doGet(goodsList1.java:22)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:78)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1033)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)

Answer 1

不知道你的自带Eclipse版本是多少，可能已经将数据库的jar包包含了。
用tomcat时需要导入数据库连接的jar包