tomcat经常性内存溢出

tomcat经常性的内存溢出 ，下面为错误代码2017-11-01 09:47:12,350 [http-apr-80-exec-5] ERROR [500.jsp] - Handler processing failed; nested exception is java.lang.OutOfMemoryError: PermGen space
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.OutOfMemoryError: PermGen space
at org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletionWithError(DispatcherServlet.java:1302)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:977)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:965)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:856)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:841)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2555)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2544)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:47:20,644 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of d2f93216f67543bf8ce1adf8e1e226ba failed: 
java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:47:30,883 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of d2f93216f67543bf8ce1adf8e1e226ba failed: 
java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:47:32,935 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of d2f93216f67543bf8ce1adf8e1e226ba failed: 
java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:47:32,937 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of d2f93216f67543bf8ce1adf8e1e226ba failed: 
java.lang.OutOfMemoryError: PermGen spaceCaused by: java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:46:49,869 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of c7a02514e5894fadbf0b445ed19b50d8 failed: 
java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:46:49,870 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of c7a02514e5894fadbf0b445ed19b50d8 failed: 
java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:46:49,870 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of c7a02514e5894fadbf0b445ed19b50d8 failed: 
java.lang.OutOfMemoryError: PermGen space
2017-11-01 09:46:50,292 [active%0053essions%0043ache.data] ERROR [net.sf.ehcache.store.disk.DiskStorageFactory] - Disk Write of c7a02514e5894fadbf0b445ed19b50d8 failed: