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java.lang.IncompatibleClassChangeError: Implementing class	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2854)	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 java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2854)	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.struts2.convention.PackageBasedActionConfigBuilder.buildClassFinder(PackageBasedActionConfigBuilder.java:416)	at org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:397)	at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:354)	at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:274)	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)	at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:967)	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:435)	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:479)	at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)