Exception in thread "http-apr-8080-exec-6" java.lang.OutOfMemoryError: PermGen space at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2904) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1173) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1681) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:141) at voucherList_1378193257591_660717.customizedInit(calculator_voucherList_1378193257591_660717:66) at net.sf.jasperreports.engine.fill.JREvaluator.init(JREvaluator.java:88) at net.sf.jasperreports.engine.fill.JRCalculator.init(JRCalculator.java:111) at net.sf.jasperreports.engine.fill.JRFillDataset.initCalculator(JRFillDataset.java:469) at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:529) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:88) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:103) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:61) at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:153) at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:82) at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:653) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:969) at org.apache.struts2.views.jasperreports.JasperReportsResult.doExecute(JasperReportsResult.java:325) at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275) at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
在网上找了半天，也在apache目录上 bin/catalina.bat文件中的echo Using CATALINA_BASE: "%CATALINA_BASE%" 上面加入了代码：
-XX:PermSize=64M -XX:MaxPermSize=128m
但还是没点反应，说也奇怪，不用myElicpse，在apahce里启动可以正常下载jasperreport表格,
原来是我把jasperreport包没有放到lib文件夹下，而是单独在新建了一个jar库，
清空所有部署在apache服务器上的项目,
就好了！
坑人啦！
害的我折腾了半天的时间。。。。。。。。
在Java中什么是内存不足错误？
答：在Java中，OutOfMemoryError是 java.lang.VirtualMachineError的一个子类，当堆内存耗尽时会被JVM抛出。我们能通过设置Java选项来提供更大的内存供应用使用来达到修复的目的。
| 1 | $>java MyProgram -Xms1024m -Xmx1024m -XX:PermSize=64M -XX:MaxPermSize=256m |
