系统环境： 系统嵌入部署，finereport版本：2015.06.29.08.09.49.350 Tomcat版本：8.0.23，JDK版本：1.8.0_40，tomcat运行参数配置如下： -Xms2048m -Xmx2048m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled 参照在线文档，执行js语句： var printurl="http://localhost:8088/ReportServer?reportlets="; FR.doURLPDFPrint(printurl, false); 内存被耗尽，发生OOM异常，堆栈信息： SEVERE: Java heap space java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:3181) at java.util.ArrayList.grow(ArrayList.java:261) at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235) at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227) at java.util.ArrayList.add(ArrayList.java:475) at com.fr.main.AbstractFineBook.addReport(Unknown Source) at com.fr.main.AbstractTemplateWorkBook.addReport(Unknown Source) at com.fr.main.impl.WorkBookTemplateDelegate.addReport(Unknown Source) at com.fr.web.reportlet.MultiTemplateReportlet.createReport(Unknown Source) at com.fr.web.core.Reportlet.createSessionIDInfor(Unknown Source) at com.fr.web.core.SessionDealWith.generateSessionID(Unknown Source) at com.fr.web.core.SessionDealWith.generateSessionIDWithCheckRegister(Unknown Source) at com.fr.web.core.ReportDispatcher.dealWithRequest(Unknown Source) at com.fr.web.BaseServlet.doGet(Unknown Source) at com.fr.web.BaseServlet.doPost(Unknown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617) 同时，查看head dump，发现com.fr.main.AbstructFineBook$NameReport实例非常多，达到54388034个实例，这个显然是陷入了死循环。 head dump截图如下。 23537