I am using liferay 6.1.1. and java version jdk1.7.0_21. I am deploying one portlet on staging server. But it is not deploying .
I am getting following exception in log. When i did R&D I came to know it is java version issue. Then I changed java version to jdk1.6.0_20. But still I am getting following error while deploying portlet. Anyone know about this issue??

INFO: Deploying web application directory /home/liferay-portal-6.1.1-ce-ga2/tomcat-7.0.27/webapps/testing-portlet
Jul 18, 2013 11:08:50 AM org.apache.catalina.core.ContainerBase addChildInternal
SEVERE: ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/testing-portlet]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:895)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:871)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1099)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1621)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid constant pool reference: 15925. Constant pool size is: 205
at org.apache.tomcat.util.bcel.classfile.ConstantPool.getConstant(ConstantPool.java:184)
at org.apache.tomcat.util.bcel.classfile.ConstantPool.getConstant(ConstantPool.java:203)
at org.apache.tomcat.util.bcel.classfile.Attribute.readAttribute(Attribute.java:109)
at org.apache.tomcat.util.bcel.classfile.FieldOrMethod.<init>(FieldOrMethod.java:58)
at org.apache.tomcat.util.bcel.classfile.Method.<init>(Method.java:72)
at org.apache.tomcat.util.bcel.classfile.ClassParser.readMethods(ClassParser.java:268)
at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:128)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2032)
at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1923)
at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1891)
at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1877)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1270)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 11 more
Jul 18, 2013 11:08:50 AM org.apache.catalina.startup.HostConfig deployDirectory
SEVERE: Error deploying web application directory /home/liferay-portal-6.1.1-ce-ga2/tomcat-7.0.27/webapps/testing-portlet
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/testing-portlet]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:898)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:871)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1099)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1621)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)