过滤器中的Java OutOfMemory错误

Question

I get a java.lang.outOfMemoryError exception, while writing a big file to the servletOutputStream. Every response is by default wrapped using a ehcache.constructs.web.filter Object for GZIP compression. And as per the logs, the exception is thrown in the Filter object. Is there a way to increase the available memory so, that the outOfMemoryError Exception does not occur ?

Answer 1

You need to add the option "-Xmx1024m" to the java command which runs your servlet container. (Replace 1024m with whatever heap size you like; this means 1024 megabytes.) If you're using, say, Tomcat, then this means you set this in the environment variable CATALINA_OPTS. Your server configuration will vary.

However, the problem is buffering such a big file in memory. This is wasteful. Try this compression filter, which doesn't buffer this way:

http://sourceforge.net/projects/pjl-comp-filter/

Answer 2

Use -Xmx Java command line option as shown below

java -Xms256m -Xmx512m com.test.MyMain

Xms represents lower end of memory allocation and Xmx represents the upper end of memory allocation

Answer 3

为您的servlet容器-Xmx256m -Xms128m设置以下JVM选项（在Tomcat中，它在catalina.sh / catalina.bat ）

Answer 4

Don't forget about possibly needing to increase your PermGen size:

-XX:PermSize=64m -XX:MaxPermSize=256m

Also do make sure you are efficiently streaming out the file. There may be unnecessarily large buffering in the output or inputstream pipe.