求助！使用tomcat部署数次后出现异常：java.lang.OutOfMemoryError: PermGen space

j_ndsc 2008-04-26 04:02:00

用tomcat6.0作web开发,tomcat服务器用一段时间后就会出现异常PermGen space，要将服务器重启一下才行，还有，在这样重启数次后，再启动tomcat又会抛出一些IO异常，要重启一下电脑才行，请问是程序不够优化，还是tomcat配置有问题？
以下是排出的异常：
java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1817)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:272)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1121)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1225)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:159)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:854)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:191)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:253)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:125)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
at com.jkl.untils.JPA.<clinit>(JPA.java:7)
at com.jkl.dao.privilege.ManagerDaoBean.managerlogon(ManagerDaoBean.java:21)
at com.jkl.action.privilege.ManagerLogonAction.execute(ManagerLogonAction.java:25)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
at com.jkl.action.privilege.PrivilegController.processActionPerform(PrivilegController.java:36)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.jkl.web.filter.Code.doFilter(Code.java:24)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

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