Tomcat 因错误 java.lang.OutOfMemoryError 崩溃：超出 GC 开销限制
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Tomcat crashes with error java.lang.OutOfMemoryError: GC overhead limit exceeded
提问by Vesselin
After the tomcat ran several months, I got unexpectetly the error below. We restarted the tomcat and the error do not appear now but may be will come again in the future. I saw that another users had simmilar exceptions, related with the garbage collection, but not related exactly with the NIO connector.
在tomcat运行几个月后，我出乎意料地出现了以下错误。我们重新启动了tomcat，错误现在没有出现，但将来可能会再次出现。我看到另一个用户有类似的异常，与垃圾收集相关，但与 NIO 连接器不完全相关。
Does somebody has an idea why this happens and what should be the correct fix to avoid it.
有人知道为什么会发生这种情况，以及应该采取什么正确的解决方法来避免这种情况。
Jan 15, 2016 7:46:47 AM org.apache.tomcat.util.net.NioEndpoint$SocketProcessor run
SEVERE:
java.lang.OutOfMemoryError: GC overhead limit exceeded
at java.util.Collections.synchronizedSet(Collections.java:1691)
at org.atmosphere.cpr.AtmosphereRequest$Builder.<init>(AtmosphereRequest.java:1146)
at org.atmosphere.cpr.AtmosphereRequest.wrap(AtmosphereRequest.java:1891)
at org.atmosphere.cpr.AtmosphereServlet.event(AtmosphereServlet.java:295)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilterEvent(ApplicationFilterChain.java:484)
at org.apache.catalina.core.ApplicationFilterChain.doFilterEvent(ApplicationFilterChain.java:377)
at org.apache.catalina.core.StandardWrapperValve.event(StandardWrapperValve.java:411)
at org.apache.catalina.core.StandardContextValve.event(StandardContextValve.java:146)
at org.apache.catalina.valves.ValveBase.event(ValveBase.java:224)
at org.apache.catalina.core.StandardHostValve.event(StandardHostValve.java:256)
at org.apache.catalina.valves.ValveBase.event(ValveBase.java:224)
at org.apache.catalina.valves.ValveBase.event(ValveBase.java:224)
at org.apache.catalina.core.StandardEngineValve.event(StandardEngineValve.java:138)
at org.apache.catalina.connector.CoyoteAdapter.event(CoyoteAdapter.java:210)
at org.apache.coyote.http11.Http11NioProcessor.event(Http11NioProcessor.java:124)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1690)
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)
回答by Arnaud
Either your server didn't have enough memory to manage some particularly memory-consuming task, or you have a memory leak.
要么你的服务器没有足够的内存来管理一些特别消耗内存的任务，要么你有内存泄漏。
- For the first case, you may want to change memory settings of tomcat with
-Xmxand-XmsVM arguments, see Java VM options.
- 对于第一种情况，您可能希望使用
-Xmx和-XmsVM 参数更改 tomcat 的内存设置，请参阅Java VM 选项。
This topic shows a full example for Tomcat: Increase Tomcat memory settings
本主题显示了Tomcat的完整示例：增加 Tomcat 内存设置
- For the second case, you should create a
heap dump, with jmapfor instance.
- 对于第二种情况，您应该
heap dump使用jmap创建一个,例如。
A heap dump file represents the current heap allocation of a java process.
堆转储文件表示 Java 进程的当前堆分配。
jmap -dump:file=<file-name> <process-id>
Here, <file-name>is the file you want to create, and <process-id>is the id of the Tomcatprocess.
这里，<file-name>是你要创建的文件，<process-id>是Tomcat进程的id 。
Some tools like Eclipse MAT, can open and analyze a heap dump file, tell you the number of objects by class, occupied memory by object types, memory leak suspects, and so on...
一些工具，如Eclipse MAT，可以打开并分析一个堆转储文件，告诉你按类划分的对象数量、按对象类型占用的内存、内存泄漏嫌疑人等等......
回答by Scott Izu
OPTION 1 CATALINA.BAT
选项 1 CATALINA.BAT
If you are running Tomcat from the following (Windows):
如果您从以下 (Windows) 运行 Tomcat：
catalina.bat start
Then, you should create a file setenv.batand add the following line:
然后，您应该创建一个文件setenv.bat并添加以下行：
set JAVA_OPTS="-Xms4096m -Xmx4096m"
OPTION 2 CATALINA.SH
选项 2 CATALINA.SH
If you are running Tomcat from the following (Linux):
如果您从以下 (Linux) 运行 Tomcat：
catalina.sh start
Then, you will have to do a similar thing and create setenv.sh adding something like the following:
然后，您将不得不做类似的事情并创建 setenv.sh 添加如下内容：
export JAVA_OPTS="-Xms4096m -Xmx4096m"
See also Increase Tomcat memory settings
另请参阅增加Tomcat内存设置
OPTION 3 TOMCAT SERVICE
选项 3 Tomcat 服务
If you are running Tomcat from a Windows Service that was installed using the Tomcat installer, go to the Windows command prompt and run something like this (this is for Tomcat 8 and can be found in something like C:\Program Files\Apache Software Foundation\Tomcat 8.0\bin):
如果您从使用 Tomcat 安装程序安装的 Windows 服务运行 Tomcat，请转到 Windows 命令提示符并运行类似的内容（这是针对 Tomcat 8 的，可以在类似内容中找到C:\Program Files\Apache Software Foundation\Tomcat 8.0\bin）：
Tomcat8w.exe
Under the Javatab, you will see Initial memory pooland Maximum memory pool. Enter this into both fields:
在Java选项卡下，您将看到Initial memory pool和Maximum memory pool。将其输入到两个字段中：
4096
Click Applyand OK.
单击Apply和OK。
From Task Manager, ServicesTab, Services, Select Apache Tomcatand press start
从Task Manager, ServicesTab, Services, 选择Apache Tomcat并按start
See also Configure Tomcat as a service (no catalina.bat)and https://plavc.wordpress.com/2012/02/08/tomcat-service-on-windows/
另请参阅将Tomcat 配置为服务（无 catalina.bat）和https://plavc.wordpress.com/2012/02/08/tomcat-service-on-windows/
