tomcat java.lang.OutOfMemoryError

安裝了64位 jdk7_17之後，tomcat 7 總是報記憶體溢出錯誤。

調整之後依然不起作用，不得已又換回32位JDK。

調整記憶體的配置：

export JAVA_OPTS="-server -Xmx1536M -XX:MaxPermSize=512m -Dfile.encoding=UTF-8"

儲存為%TOMCAT_HOME%/bin/setenv.bat

參數說明：

-server

    Select the Java HotSpot Server VM.
    For more information, see Server-Class Machine Detection[http://docs.oracle.com/javase/1.5.0/docs/guide/vm/server-class.html]

-Xmxn
    Specify the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Append the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. Examples:

               -Xmx83886080
               -Xmx81920k
               -Xmx80m
               
-XX:MaxPermSize=64m
    Size of the Permanent Generation.  [5.0 and newer: 64 bit VMs are scaled 30% larger; 1.4 amd64: 96m; 1.3.1 -client: 32m.]

-Dproperty=value
    Set a system property value. If value is a string that contains spaces, you must enclose the string in double quotes:

                java -Dfoo="some string" SomeClass

參考資料：

[1] Artur Ejsmont. http://artur.ejsmont.org/blog/content/fixing-javalangoutofmemoryerror-permgen-out-of-memory-in-grails-sts-and-tomcat

[2] java - the Java application launcher. http://docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/java.html

[3] Java HotSpot VM Options. http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html