tomcat发布工程，内存溢出，请高手们进来指点
前提条件
tomcat7
jdk7
发布到tomcat7的webapp 大小 250M
已经试过的办法，配置tomcat的内存参数没用，配置JDK的内存参数没用，配置Myeclipse的内存参数没用。
核心错误信息如下
Caused by: java.lang.RuntimeException: by java.lang.OutOfMemoryError: PermGen space
at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:509)
at javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:486)
at javassist.util.proxy.ProxyFactory.createClass1(ProxyFactory.java:422)
at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:394)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:163)
... 108 more
Caused by: javassist.CannotCompileException: by java.lang.OutOfMemoryError: PermGen space
at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:169)
at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:501)
... 112 more
Caused by: java.lang.OutOfMemoryError: PermGen space

一月 06, 2013 8:11:07 上午 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory D:\Common\Tomcat7\webapps\docs
一月 06, 2013 8:11:07 上午 org.apache.catalina.startup.HostConfig deployDirectories
SEVERE: Error waiting for multi-thread deployment of directories to completehostConfig.deployWar=Deploying web application archive {0}
java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: PermGen space
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1037)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:479)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1402)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:402)
at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:347)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1140)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at jav