Invalid initial heap size: -Xms512m -Xmx1024m Could not create Java Virtual Machine

很遺憾，我無法reproduce當時的錯誤，只好簡單描述一下了，sigh....

在批處理文件裡設置jvm的初始內存最大/最小值。

1）首先，判斷系統可以設置的最大內存值

Start > Run > input 'cmd' in [Run] dialog and click on 'OK'.

In command window, input the following command

java -Xmx2046m -version

set JAVA_OPTS=-server -Xms768m -Xmx768m -XX:PermSize=128M -XX:MaxNewSize=256m -XX:MaxPermSize=256m

注意這裡提示說明2046m超出了系統的限制。將最大內存值減小至1640m時，查看執行結果，說明系統的最大限制為1640M.

2)在批處理文件裡設置JAVA_OPTS=-Xms516m -Xmx1024m後，執行時提示如下錯誤：

Invalid initial heap size: -Xms512m -Xmx1024m

Could not create Java Virtual Machine

根據bug_34029嘗試將最大與最小內存值分別設置在兩個變量裡，即，

set JAVA_OPTS_MAX=-Xmx1024m

set JAVA_OPTS_MIN=-Xms512m

便成功了。（在reproduce時，發現即使定義在同一變量裡似乎也是沒有問題的，原因未查）

Bug34029- Invalid initial heap size: -Xms64m -Xmx512m Could not create Java Virtual Machine

Status: RESOLVED INVALID Product: Ant Component: Build Process Version: 1.5 Platform: Other other Importance: P2 normal(vote) TargetMilestone: --- Assigned To: Ant Notifications List URL: Keywords: Dependson: Blocks: Show dependencytree		Reported: 2005-03-16 08:08 UTC byRajadurai Modified: 2008-02-22 12:18 UTC (History) CC List: 0 users

Attachments Add an attachment(proposed patch, testcase, etc.) NoteYou need tolog inbefore you can comment on or make changes to this bug.

Description Rajadurai 2005-03-16 08:08:48 UTC i m using jdk1.5.0_01 if i user java.exe of jdk1.5.0_01 then i m getting the following error Invalid initial heap size: -Xms64m -Xmx512m Could not create Java Virtual Machine. But if i run java.exe in the command prompt with the same jvm arguments. its not giving any problem. is this the bug in ant or i m doing any mistake. Following the target +--------------------------------------------------- + | | | G E N E R A T E C U D S F X M L | | | +--------------------------------------------------- + Generating actions xml for ${ant.project.name} Generated actions xml for ${ant.project.name} Comment 1 Jan Mat 2005-03-16 08:12:15 UTC gets only ONE value - maybe with spaces. Use two or a . As the manual sais ...