Exception in thread "http-apr-8080-exec-6" java.lang.OutOfMemoryError: PermGen space 解决!

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)Exception in thread "http-apr-8080-exec-6" java