Com / mysql / jdbc / Driver: Unsupported version of major.minor 52.0

Question

I have this problem when I deploy my war USING mysql-connector-java-6.0.3.jar on Apache Tomcat / 7.0.52 (Ubuntu) JVM: 1.7.0_79-b14 compiled with JDK 1.7

java.lang.UnsupportedClassVersionError: com/mysql/jdbc/Driver : Unsupported major.minor version 52.0 (unable to load class com.mysql.jdbc.Driver) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2948) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1208) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569) java.lang.Class.forName0(Native Method) java.lang.Class.forName(Class.java:191) com.tdk.callbacks.CallBacksListener.doGet(CallBacksListener.java:45) javax.servlet.http.HttpServlet.service(HttpServlet.java:620) javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 

This is when compiling with 1.8

 java.lang.UnsupportedClassVersionError: com/tdk/callbacks/CallBacksListener : Unsupported major.minor version 52.0 (unable to load class com.tdk.callbacks.CallBacksListener) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2948) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1208) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) java.lang.Thread.run(Thread.java:745) 

and this one with 1.6 :

 java.lang.Error: Unresolved compilation problem: Multi-catch parameters are not allowed for source level below 1.7 

Answer 1

The problem is not compilation. The problem is that you are trying to launch your Tomcat using a deployed application using java 7. As your mysql driver and, potentially, your application is compiled using java 8, you need to use java 8 to start Tomcat