tomcat内存溢出

1.

严重: Unexpected death of background thread ContainerBackgroundProcessor[StandardEngine[Catalina]]
java.lang.OutOfMemoryError: PermGen space
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2957)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:519)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5266)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5554)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4033)
	at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1546)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1556)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1556)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1524)
	at java.lang.Thread.run(Thread.java:745)

Exception in thread "Thread-15" java.lang.OutOfMemoryError: PermGen space
	at io.netty.util.internal.chmv8.ForkJoinPool.execute(ForkJoinPool.java:2557)
	at io.netty.util.concurrent.SingleThreadEventExecutor.scheduleExecution(SingleThreadEventExecutor.java:739)
	at io.netty.util.concurrent.SingleThreadEventExecutor.shutdownGracefully(SingleThreadEventExecutor.java:505)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.shutdownGracefully(MultithreadEventExecutorGroup.java:180)
	at io.netty.util.concurrent.AbstractEventExecutorGroup.shutdownGracefully(AbstractEventExecutorGroup.java:70)
	at com.zhht.platform.zhbcms.server.ZHBCmsServer.initZHBCmsMessageServer(ZHBCmsServer.java:38)
	at com.zhht.platform.zhbcms.server.ZHBCmsServer.access$0(ZHBCmsServer.java:26)
	at com.zhht.platform.zhbcms.server.ZHBCmsServer$1.run(ZHBCmsServer.java:69)
	at java.lang.Thread.run(Thread.java:745)
Exception in thread "Thread-16" java.lang.OutOfMemoryError: PermGen space
	at io.netty.util.internal.chmv8.ForkJoinPool.execute(ForkJoinPool.java:2557)
	at io.netty.util.concurrent.SingleThreadEventExecutor.scheduleExecution(SingleThreadEventExecutor.java:739)
	at io.netty.util.concurrent.SingleThreadEventExecutor.shutdownGracefully(SingleThreadEventExecutor.java:505)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.shutdownGracefully(MultithreadEventExecutorGroup.java:180)
	at io.netty.util.concurrent.AbstractEventExecutorGroup.shutdownGracefully(AbstractEventExecutorGroup.java:70)
	at com.zhht.platform.zhbcms.server.ZHBCmsServer.initZHBCmsFileServer(ZHBCmsServer.java:58)
	at com.zhht.platform.zhbcms.server.ZHBCmsServer.access$1(ZHBCmsServer.java:46)
	at com.zhht.platform.zhbcms.server.ZHBCmsServer$2.run(ZHBCmsServer.java:79)
	at java.lang.Thread.run(Thread.java:745)
Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: PermGen space
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2957)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:519)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5266)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5554)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4033)
	at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:425)
	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1546)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1556)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1556)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1524)
	at java.lang.Thread.run(Thread.java:745)

 

分析：

先看一下内存使用情况

 

               总大小     已使用   

堆           2036M     73M (上下浮动)

栈           82M         81M

运行这段代码

 

class TimerThread extends Thread {
    /**
     * This flag is set to false by the reaper to inform us that there
     * are no more live references to our Timer object.  Once this flag
     * is true and there are no more tasks in our queue, there is no
     * work left for us to do, so we terminate gracefully.  Note that
     * this field is protected by queue's monitor!
     */
    boolean newTasksMayBeScheduled = true;

    /**
     * Our Timer's queue.  We store this reference in preference to
     * a reference to the Timer so the reference graph remains acyclic.
     * Otherwise, the Timer would never be garbage-collected and this
     * thread would never go away.
     */
    private TaskQueue queue;

    TimerThread(TaskQueue queue) {
        this.queue = queue;
    }

    public void run() {
        try {
            mainLoop();
        } finally {
            // Someone killed this Thread, behave as if Timer cancelled
            synchronized(queue) {
                newTasksMayBeScheduled = false;
                queue.clear();  // Eliminate obsolete references
            }
        }
    }

 报出

 

Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: PermGen space
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2957)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:519)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)