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Editorial Team
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Asked: 2026-05-14T20:25:42+00:00

The web app occasionally get hang for about 30 seconds when user request a

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The web app occasionally get hang for about 30 seconds when user request a web page, the server’s CPU and memory usage are ok, and the jstack shows:

"http-9999-3" daemon prio=6 tid=0x552f3400 nid=0xf40 runnable [0x578fc000]
   java.lang.Thread.State: RUNNABLE
    at org.eclipse.jdt.internal.compiler.parser.Parser.getTypeReference(Parser.java:8354)
    at org.eclipse.jdt.internal.compiler.parser.Parser.consumeClassHeaderExtends(Parser.java:2125)
    at org.eclipse.jdt.internal.compiler.parser.Parser.consumeRule(Parser.java:5107)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:9020)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:9251)
    at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:9208)
    at org.eclipse.jdt.internal.compiler.parser.Parser.dietParse(Parser.java:7864)
    at org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:587)
    at org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:357)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:371)
    at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:413)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:317)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:282)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    - locked <0x10a75fc0> (a org.apache.jasper.servlet.JspServletWrapper)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)
    ......

seems it’s related with some jsp files, how to find the root cause? thanks.

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1 Answer

  1. Editorial Team

    If the web page hangs it seems like the Garbage Collector in Java has entered the scene. Try some JVM options like the one found here or more complete here.

    I would start with the parallel garbage collector by enabling it with 

    -XX:-UseParallelGC

    If the problem has really to do with your JSPs than the reason is that every JSP has to be compiled for the first time it is used. If you have very complex JSPs (maybe which include several other JSPs) this might take some time.

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