How come my JSF code is getting a "java.lang.OutOfMemoryError: Java heap space"?

Question

I am getting a java.lang.OutOfMemoryError: Java heap space and I am not sure how to avoid it. I am writing out to what I thought was basically a socket buffer. I think it is javax.servlet.jsp.JspWriter.

However, when I attempt to write very large HTML file, ~700,000 lines, I get a java.lang.OutOfMemoryError: Java heap space. I confused why the framework doesn't just flush to socket. (Marsha, Marsha, Marsha) Kidding aside, can I make it flush to socket rather just growing the buffer.

I am using JSF 1.1.

Note, I did try adding this web.xml:

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

It did not seem to change anything.

Here is my code sample:

<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>

Here is the exception I get:

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)

BTW, BalusC, if your out there please help. No pressure, lol. You answer about half the JSF questions.

Grae

Your question implies that smaller files work without problems. Is that correct? — kolossus, Jan 05 '15 at 14:16
@koloossus Yes, it works fine. It looks like BodyContentImpl is writing to a char[] cp, rather than writing to the socket. — GC_, Jan 05 '15 at 18:31
Nothing is going to arbitrarily write to a different output; it's a simple case of the amount of data overwhelming the heap. Tweak your heap size settings to sort this out — kolossus, Jan 05 '15 at 19:01
@kolossus If you look at the code for BodyContentImpl, pushBody does change the "out" from the response writer to char buffer. — GC_, Jan 05 '15 at 21:01

score 0 · Answer 1 · answered Jan 05 '15 at 04:29

0

You can try using -Xmx to increase heap size.
For apache tomcat use i.e. export CATALINA_OPTS="-Xmx1024M"

answered Jan 05 '15 at 04:29

Ye Win

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How come my JSF code is getting a "java.lang.OutOfMemoryError: Java heap space"?

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