再现OutOfMemoryError:Java heap space

最近在做一个项目,使用架构是struts2.0+ejb3.0(struts2.0刚刚学习不久),本地服务器使用的是JBOSS4.0.5GA,
数据库是ORACLE10G,现正处于开发阶段,可是一个恼人的问题始终没办法解决----OutOfMemoryError:Java heap space. 使用Eclipse启动jboss后,运行几次就会出现内存溢出问题,我的机器是2GB内存,应该够用吧!
调整虚拟机参数也不行.
我怀疑是我的struts2的使用上有问题,可是找不出原因是什么,开始的时候我以为是JBOSS的问题,联系了JBOSS的余先生,那边的技术给我回复的mail是可能"返回的list没有释放".我迷糊了,我的view是用的freemarker,从action中取出的数据到ftl里面显示,这让我怎么释放呢?难道struts2本身没有清除valuestack的东东么?ActionContextCleanUp 难道不能解决这个问题么?
我的web.xml配置是:

<filter> 
   <filter-name>struts-cleanup</filter-name> 
   <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class> 
</filter>
<filter>  
   <filter-name>struts2</filter-name>  
   <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping> 
   <filter-name>struts-cleanup</filter-name> 
     <url-pattern>/*</url-pattern> 
</filter-mapping>
<filter-mapping>  
   <filter-name>struts2</filter-name>  
   <url-pattern>/*</url-pattern>  
</filter-mapping>

Eclipse控制台输出的异常信息是:

16:30:39,687 ERROR [[default]] Servlet.service() for servlet default threw exception
java.lang.OutOfMemoryError: Java heap space
	at java.lang.String.toCharArray(String.java:2726)
	at freemarker.core.TextBlock.<init>(TextBlock.java:77)
	at freemarker.core.FMParser.PCData(FMParser.java:2466)
	at freemarker.core.FMParser.Content(FMParser.java:2528)
	at freemarker.core.FMParser.OptionalBlock(FMParser.java:2742)
	at freemarker.core.FMParser.Root(FMParser.java:2914)
	at freemarker.template.Template.<init>(Template.java:149)
	at freemarker.cache.TemplateCache.loadTemplate(TemplateCache.java:376)
	at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:347)
	at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:229)
	at freemarker.template.Configuration.getTemplate(Configuration.java:487)
	at freemarker.core.Environment.getTemplateForInclusion(Environment.java:1357)
	at freemarker.core.Include.accept(Include.java:143)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.process(Environment.java:176)
	at freemarker.template.Template.process(Template.java:232)
	at org.apache.struts2.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:168)
	at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:178)
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:343)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:213)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
	at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
	at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
	at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
	at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)

大家谁有没有好的建议和方法,谢谢了!