POI导出用JDK8正常换JDK7就内存溢出，怎么回事？
// 声明一个工作薄
XSSFWorkbook workbook = null;
// 生成一个表格
XSSFSheet sheet = null;
try {
workbook = new XSSFWorkbook();
//这句报异常
sheet = workbook.createSheet(title);
} catch (Exception e){
e.printStackTrace();
}堆栈信息如下
org.apache.poi.POIXMLException: org.apache.poi.POIXMLException: java.lang.reflect.InvocationTargetException at org.apache.poi.POIXMLDocumentPart.createRelationship(POIXMLDocumentPart.java:423) at org.apache.poi.POIXMLDocumentPart.createRelationship(POIXMLDocumentPart.java:383) at org.apache.poi.xssf.usermodel.XSSFWorkbook.createSheet(XSSFWorkbook.java:780) at cn.hoobok.callcenter.web.controller.demo.ExportController.export(ExportController.java:50) at cn.hoobok.callcenter.web.controller.demo.ExportController$$FastClassBySpringCGLIB$$c061a209.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:52) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:168) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653) at cn.hoobok.callcenter.web.controller.demo.ExportController$$EnhancerBySpringCGLIB$$54dd4be9.export(<generated>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868) at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 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 org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) at cn.hoobok.callcenter.core.shiro.CustomFilter.doFilter(CustomFilter.java:43) 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:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2466) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2455) 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:745) Caused by: org.apache.poi.POIXMLException: java.lang.reflect.InvocationTargetException at org.apache.poi.xssf.usermodel.XSSFFactory.newDocumentPart(XSSFFactory.java:73) at org.apache.poi.POIXMLDocumentPart.createRelationship(POIXMLDocumentPart.java:408) ... 69 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.apache.poi.xssf.usermodel.XSSFFactory.newDocumentPart(XSSFFactory.java:71) ... 70 more Caused by: java.lang.OutOfMemoryError: PermGen space at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2957) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2957) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at org.apache.xmlbeans.impl.schema.SchemaTypeImpl.getJavaImplClass(SchemaTypeImpl.java:1739) at org.apache.xmlbeans.impl.schema.SchemaTypeImpl.getJavaImplConstructor(SchemaTypeImpl.java:1793) at org.apache.xmlbeans.impl.schema.SchemaTypeImpl.createUnattachedNode(SchemaTypeImpl.java:1928) at org.apache.xmlbeans.impl.schema.SchemaTypeImpl.createElementType(SchemaTypeImpl.java:1051) at org.apache.xmlbeans.impl.values.XmlObjectBase.create_element_user(XmlObjectBase.java:938) at org.apache.xmlbeans.impl.store.Xobj.getUser(Xobj.java:1675) at org.apache.xmlbeans.impl.store.Cur.getUser(Cur.java:2659) at org.apache.xmlbeans.impl.store.Xobj.insertElement(Xobj.java:2117) at org.apache.xmlbeans.impl.store.Xobj.add_element_user(Xobj.java:2197) at org.openxmlformats.schemas.spreadsheetml.x2006.main.impl.CTSheetViewsImpl.addNewSheetView(Unknown Source) at org.apache.poi.xssf.usermodel.XSSFSheet.newSheet(XSSFSheet.java:281) at org.apache.poi.xssf.usermodel.XSSFSheet.onDocumentCreate(XSSFSheet.java:225) at org.apache.poi.xssf.usermodel.XSSFSheet.<init>(XSSFSheet.java:157) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) Exception in thread "http-apr-8080-exec-7" java.lang.OutOfMemoryError: PermGen space
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评论（7）
引用来自“抓瓦工人”的评论
因为jdk8后这个空间如果内存不够就会使用硬盘
尴尬，我能不能改匿名啊。。
Caused by: java.lang.OutOfMemoryError: PermGen space
Java8之前的Hotspot,都要设置Perm的,赶紧去设置
PS:这种小朋友的问题,能不能百度啊?
为什么上面代码会导致内存不足啊
回复
代码没问题，主要是你的数据量大
http://my.oschina.net/benhaile/blog/214159这里有详细介绍，希望能帮到你
因为jdk8后这个空间如果内存不够就会使用硬盘