ROOT CAUSE: java.lang.OutOfMemoryError: Java heap space [Using Apache for Coldfusion 7 on localhost]

I am getting following error message all of the sudden. 5 minuted before everything was working fine.

500

ROOT CAUSE: 
java.lang.OutOfMemoryError: Java heap space


javax.servlet.ServletException: ROOT CAUSE: 
java.lang.OutOfMemoryError: Java heap space

    at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:70)
    at cold开发者_StackOverflow中文版fusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46)
    at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)
    at jrun.servlet.FilterChain.service(FilterChain.java:101)
    at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:106)
    at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
    at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:286)
    at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:543)
    at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:203)
    at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:428)
    at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)

Please help to correct this..

Have you tried increasing the Java VM maximum memory allocation ? e.g.

java -Xmx512m ...

will set the maximum memory allocation to 512m. You may be running with the default memory settings, and that may not be sufficient for your application. See here for an introduction to the available options and what they mean.