java.lang.UnsupportedClassVersionError: bad major version at offset=6
apache, tomcat, unsupported-class-version
Solution
You have essentially compiled your code with JDK 1.6 but running it with Java 5 - Just ensure a Java 6 runtime.
Problem
I have deployed a `WAR file` in the `webapps` folder in my `tomcat`. And when I am starting my tomcat, like below ``` C:\apache-tomcat-6.0.35\bin>startup.bat Using CATALINA_BASE: "C:\apache-tomcat-6.0.35" Using CATALINA_HOME: "C:\apache-tomcat-6.0.35" Using CATALINA_TMPDIR: "C:\apache-tomcat-6.0.35\temp" Using JRE_HOME: "C:\Program Files (x86)\IBM\RationalSDLC\Common\Java5.0\jre" Using CLASSPATH: "C:\apache-tomcat-6.0.35\bin\bootstrap.jar" ``` I am getting this below exception- ``` SEVERE: Error deploying web application archive DirectoryServer.war java.lang.UnsupportedClassVersionError: (com/services/rest/Listener) bad major version at offset=6 (unable to load class com.services.rest.Listener) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2822) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1159) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526) at org.apache.catalina.startup.WebAnnotationSet.loadClassAnnotation(WebAnnotationSet.java:145) at org.apache.catalina.startup.WebAnnotationSet.loadApplicationListenerAnnotations(WebAnnotationSet.java:73) at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:56) at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:297) at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1078) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4612) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943) at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065) at org.apache.catalina.core.StandardHost.start(StandardHost.java:840) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463) at org.apache.catalina.core.StandardService.start(StandardService.java:525) at org.apache.catalina.core.StandardServer.start(StandardServer.java:754) at org.apache.catalina.startup.Catalina.start(Catalina.java:595) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) ``` And this is my JAVA version- ``` C:\apache-tomcat-6.0.35\bin>java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) ``` Can anyone provide any suggestion why is it happening?