Question

tomcat报错，求解 弄了一天了。。。

HTTP Status 500 - Servlet execution threw an exception Exception report
Servlet execution threw an exception
The server encountered an internal error that prevented it from fulfilling this request.javax.servlet.ServletException: Servlet execution threw an exception org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
java.lang.AbstractMethodError: com.mysql.jdbc.Connection.isValid(I)Z org.apache.tomcat.dbcp.dbcp2.DelegatingConnection.isValid(DelegatingConnection.java:913) org.apache.tomcat.dbcp.dbcp2.PoolableConnection.validate(PoolableConnection.java:226) org.apache.tomcat.dbcp.dbcp2.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:302) org.apache.tomcat.dbcp.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2208) org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2191) org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:1945) org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1412) chapter4.ViewDictionary.doGet(ViewDictionary.java:27) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.21 logs.

Answer 1

你要把你的Java版本和Tomcat版本都写出来，还有就是MySQL的JDBC驱动版本，看上去很像几个版本不匹配，比如Connection.isValid()需要JDK 1.6，还有JDBC驱动是不是旧了。

追问

不好意思，几天没看了，问题一直放着，也没继续下去，抱歉。
先谢谢你的回答。
不知道是不是这些：
apache-tomcat-8.0.21
jdk1.8.0_31
jre1.8.0_31
mysql-connector-java-5.0.7-bin.jar