Tomcat内存溢出解决方案

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 今天在运行MyEclipse时，因为项目原因导致内存溢出了，tomcat跑不起来，话不多说，贴上异常：

java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: PermGen space
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:188)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1163)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:497)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1713)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:337)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:388)
	at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:333)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1136)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.OutOfMemoryError: PermGen space
	at ch.qos.logback.classic.spi.LoggingEvent.<init>(LoggingEvent.java:121)
	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:440)
	at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:396)
	at ch.qos.logback.classic.Logger.log(Logger.java:788)
	at org.apache.commons.logging.impl.SLF4JLocationAwareLog.warn(SLF4JLocationAwareLog.java:199)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:487)
	at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548)
	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:1269)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1182)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1072)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5368)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5660)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	... 4 more
Exception in thread "main" 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 java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at org.apache.catalina.core.ContainerBase.threadStart(ContainerBase.java:1462)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1139)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:444)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:758)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:693)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:428)

解决方案：

分析原因：

PermGen space的全称是Permanent Generation space，是指内存的永久保存区域。

为什么会内存溢出，这是由于这块内存主要是被JVM存放Class和Meta信息的，Class在被Load的时候被放入PermGen space区域，它和存放Instance的Heap区域不同,sun的 GC不会在主程序运行期对PermGen space进行清理，所以如果你的APP会载入很多CLASS的话，就很可能出现PermGen space溢出。

说白了就是因为jvm中的内存空间不足以处理太多的class，所以需要增加内存。

转载于:https://my.oschina.net/liangguoqiang/blog/860706