java.lang.VerifyError: Cannot inherit from final class

Problem: "java.lang.VerifyError: Cannot inherit from final class" Error seen in JBOSS Server.log file.

2012-10-09 12:47:47,886 WARN  [org.jboss.detailed.classloader.ClassLoaderManager] (MT-AIR_XMLRPC_02) Unexpected error during load of:org.apache.http.params.SyncBasicHttpParams
java.lang.VerifyError: Cannot inherit from final class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:63)
    at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:572)
    at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:532)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:530)
    at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:507)
    at org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:134)
    at org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:131)
    at org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:452)
    at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:251)
    at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:150)
    at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:265)
    at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1119)
    at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:798)
    at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:441)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at org.apache.http.impl.client.DefaultHttpClient.createHttpParams(DefaultHttpClient.java:161)
    at org.apache.http.impl.client.AbstractHttpClient.getParams(AbstractHttpClient.java:426)
    at org.apache.xmlrpc.XmlRpcHttpClient.setConnectTimeout(XmlRpcHttpClient.java:306)


Solution: java.lang.VerifyError comes when a component is not able to identify the jar file at the run time. Check on your server, if you have two different jars of different versions for the same component.