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Question Tomcat java.lang.OutOfMemoryError: Java heap space

AfterBit

New Pleskian
Hello,
plesk for linux and tomcat..

CPU : Intel(R) Xeon(R) CPU E5-26xx (Sandy Bridge) (4 core(s))
Version Plesk v12.5.30_build1205150826.19 os_Debian 8.0
OS Debian 8.4
Memory Usage
Total 15.71 GB
Used 2.19 GB

sometime i get the following error and my website go off line!
how can i resolve this? thanks!

error from catalina.out file :

Aug 01, 2016 11:43:46 AM com.sun.faces.context.ExceptionHandlerImpl log
1100: JSF1073: javax.faces.FacesException caught during processing of RENDER_RESPONSE 6 : UIComponent-ClientId=, Message=java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-27" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2367)
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)
at java.lang.StringBuffer.append(StringBuffer.java:237)
at java.io.StringWriter.write(StringWriter.java:112)
at java.io.PrintWriter.write(PrintWriter.java:456)
at java.io.PrintWriter.write(PrintWriter.java:473)
at java.io.PrintWriter.print(PrintWriter.java:603)
at java.io.PrintWriter.println(PrintWriter.java:756)
at java.lang.Throwable$WrappedPrintWriter.println(Throwable.java:764)
at java.lang.Throwable.printEnclosedStackTrace(Throwable.java:697)
at java.lang.Throwable.printStackTrace(Throwable.java:667)
at java.lang.Throwable.printStackTrace(Throwable.java:721)
at java.util.logging.SimpleFormatter.format(SimpleFormatter.java:157)
at org.apache.juli.FileHandler.publish(FileHandler.java:198)
at java.util.logging.Logger.log(Logger.java:616)
at java.util.logging.Logger.doLog(Logger.java:641)
at java.util.logging.Logger.log(Logger.java:730)
at com.sun.faces.context.ExceptionHandlerImpl.log(ExceptionHandlerImpl.java:323)
at com.sun.faces.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:152)
at javax.faces.context.ExceptionHandlerWrapper.handle(ExceptionHandlerWrapper.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
Exception in thread "ajp-bio-127.0.0.1-9008-exec-28" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-22" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-32" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-21" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-36" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-38" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-39" Exception in thread "ajp-bio-127.0.0.1-9008-exec-10" java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-35" java.lang.OutOfMemoryError: Java heap space
Exception in thread "ajp-bio-127.0.0.1-9008-exec-41" Exception in thread "ajp-bio-127.0.0.1-9008-exec-40" java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
 
ok thanks... i've seen the link..
plesk does not have a java profiler?.. if not.. could you help me to understand how to install a java profiler under plesk?
 
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