Question

在我的readXlsx方法开始时，此行会抛出一个PermGen Error：

XSSFWorkbook wb = new XSSFWorkbook(OPCPackage.open(is));

其中is是通过HTTP Post发送的Excel文件的InputStream。

尝试使用此错误上载几次导致tomcat崩溃。发送的文件不大于 0,05 MB 。

知道是什么原因引起的吗？

我发现我从未关闭InputStream，这会导致这个吗？

编辑：它实际上是声明XSSFWorkbook的行的POIXMLException，由PermGen错误导致

StackTrace: org.apache.poi.POIXMLException: java.lang.reflect.InvocationTargetException 
at org.apache.poi.xssf.usermodel.XSSFFactory.createDocumentPart(XSSFFactory.java:62) 
at org.apache.poi.POIXMLDocumentPart.read(POIXMLDocumentPart.java:403) 
at org.apache.poi.POIXMLDocument.load(POIXMLDocument.java:155) 
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:186) 
at classes.XLSXReader.readXLSX(XLSXReader.java:23) 
at trainweb.ParticipantUploader.uploadCourseParticipants(ParticipantUploader.java:204) 
at trainweb.ParticipantUploader.doPost(ParticipantUploader.java:139) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) 
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190) 
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291) 
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769) 
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698) 
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891) 
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690) 
at java.lang.Thread.run(Thread.java:619) 
Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
at org.apache.poi.xssf.usermodel.XSSFFactory.createDocumentPart(XSSFFactory.java:60) 
... 23 more 
Caused by: java.lang.OutOfMemoryError: PermGen space 
at java.lang.String.intern(Native Method) 
at org.apache.xmlbeans.impl.piccolo.util.CharStringConverter.convert(CharStringConverter.java:110) 
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.yytext2(PiccoloLexer.java:3319) 
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.parseElementNameNS(PiccoloLexer.java:2360) 
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.parseOpenTagNS(PiccoloLexer.java:1455) 
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.parseTagNS(PiccoloLexer.java:1362) 
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.yylex(PiccoloLexer.java:4678) 
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.yylex(Piccolo.java:1290) 
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.yyparse(Piccolo.java:1400) 
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.parse(Piccolo.java:714) 
at org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3439) 
at org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1270) 
at org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1257) 
at org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderBase.java:345) 
at org.openxmlformats.schemas.drawingml.x2006.main.ThemeDocument$Factory.parse(Unknown Source) 
at org.apache.poi.xssf.model.ThemesTable.<init>(ThemesTable.java:44) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.Native

Answer 1

PermGen意味着您已经耗尽了JVM中新Java类的空间。可能你已经接近极限了，一旦你第一次尝试使用一个大型库，它就无法加载它所需的所有类。

您应该提高限制，将-XX：MaxPermSize = ...传递给JVM，例如-XX：MaxPermSize = 128m。

Answer 2

在应用程序服务器或Web服务器等环境中运行时，加载的类数可能太高。因此，请在应用程序服务器（或Tomcat等Web应用程序服务器）中运行时增加PermSize。

为此，请将-XX:MaxPermSize=...m附加到启动服务器的java命令中。请阅读服务器文档，了解如何附加其他参数。

如果使用的JRE不是来自Oracle的JRE，则给定的参数可以不同。

读取XLSX会抛出OutOfMemoryError PermGen

2 个答案: