为什么我的 JSF 代码会出现“java.lang.OutOfMemoryError: Java heap space”？

【问题标题】：How come my JSF code is getting a "java.lang.OutOfMemoryError: Java heap space"?为什么我的 JSF 代码会出现“java.lang.OutOfMemoryError: Java heap space”？
【发布时间】：2015-01-05 04:26:37
【问题描述】：

我收到了java.lang.OutOfMemoryError: Java heap space，但我不知道如何避免它。我正在写出我认为基本上是套接字缓冲区的内容。我想是javax.servlet.jsp.JspWriter。

但是，当我尝试编写非常大的 HTML 文件（约 700,000 行）时，我得到了 java.lang.OutOfMemoryError: Java heap space。我很困惑为什么框架不只是刷新到套接字。 (Marsha, Marsha, Marsha) 开个玩笑，我可以让它刷新到套接字，而不是仅仅增加缓冲区。

我正在使用 JSF 1.1。

注意，我确实尝试添加此 web.xml：

<context-param>  
    <param-name>facelets.BUFFER_SIZE</param-name>  
    <param-value>500000</param-value>  
</context-param>

它似乎没有改变任何东西。

这是我的代码示例：

<html>
    <f:view>
        <head>
            <title>Test</title>
        </head>
        <body id="page_body"
            <h:form id="form">
                <%
                    String s;
                    for (int i = 0; i < rowCount; i++) {
                        s = data.get(i);
                        out.println(s);
                        //flush after on every thousandths row.
                        //if(i%1000==1)
                        //         out.flush();
                    }  // for loop
                %>
            </h:form>
        </body>
    </f:view>
</html>

这是我得到的例外：

org.apache.jasper.JasperException: org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.OutOfMemoryError: Java heap space
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
    com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
    test.CustomLocaleRemapViewHandler.renderView(CustomLocaleRemapViewHandler.java:94)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
    com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
    test.CustomFilter.doFilter(CustomFilter.java:46)
    test.CustomFilter2.doFilter(CustomFilter2.java:81)
    org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)


root cause 

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.OutOfMemoryError: Java heap space
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:746)
    org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:716)
    org.apache.jsp.test2_jsp._jspService(test2_jsp.java:122)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
    com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
    test.CustomLocaleRemapViewHandler.renderView(CustomLocaleRemapViewHandler.java:94)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
    com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
    test.CustomFilter.doFilter(CustomFilter.java:46)
    test.CustomFilter2.doFilter(CustomFilter2.java:81)
    org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)


root cause 

javax.servlet.ServletException: java.lang.OutOfMemoryError: Java heap space
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:912)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)
    org.apache.jsp.test_jsp._jspService(test_jsp.java:745)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:746)
    org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:716)
    org.apache.jsp.test2_jsp._jspService(test2_jsp.java:122)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
    com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
    test.CustomLocaleRemapViewHandler.renderView(CustomLocaleRemapViewHandler.java:94)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
    com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
    test.CustomFilter.doFilter(CustomFilter.java:46)
    test.CustomFilter2.doFilter(CustomFilter2.java:81)
    org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)


root cause 

java.lang.OutOfMemoryError: Java heap space
    java.util.Arrays.copyOf(Unknown Source)
    java.io.ByteArrayOutputStream.grow(Unknown Source)
    java.io.ByteArrayOutputStream.ensureCapacity(Unknown Source)
    java.io.ByteArrayOutputStream.write(Unknown Source)
    sun.nio.cs.StreamEncoder.writeBytes(Unknown Source)
    sun.nio.cs.StreamEncoder.implWrite(Unknown Source)
    sun.nio.cs.StreamEncoder.write(Unknown Source)
    java.io.OutputStreamWriter.write(Unknown Source)
    java.io.PrintWriter.write(Unknown Source)
    java.io.PrintWriter.write(Unknown Source)
    test.CustomWrapper$CustomPrintWriter.write(CustomWrapper.java:82)
    org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119)
    org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:336)
    java.io.Writer.write(Unknown Source)
    com.sun.faces.renderkit.html_basic.HtmlResponseWriter.write(HtmlResponseWriter.java:519)
    com.sun.faces.taglib.jsf_core.ViewTag.doAfterBody(ViewTag.java:196)
    org.apache.jsp.test_jsp._jspService(test_jsp.java:725)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

顺便说一句，BalusC，如果你在那里，请帮忙。没压力，呵呵。你回答了大约一半的 JSF 问题。

格雷

【问题讨论】：

  • 您的问题意味着较小的文件可以正常工作。对吗？
  • @koloossus 是的，它工作正常。看起来 BodyContentImpl 正在写入 char[] cp，而不是写入套接字。
  • 没有东西会随意写入不同的输出；这是一个数据量压倒堆的简单案例。调整你的堆大小设置来解决这个问题
  • @kolossus 如果您查看 BodyContentImpl 的代码，pushBody 确实将响应写入器的“输出”更改为字符缓冲区。

标签： jsf jsf-1.1


【解决方案1】：

您可以尝试使用 -Xmx 来增加堆大小。
对于 apache tomcat 使用，即 export CATALINA_OPTS="-Xmx1024M"

【讨论】：

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