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

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最新推荐文章于 2025-06-11 19:36:06 发布 · 622 阅读

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本文详细描述了如何在批处理文件中设置Java虚拟机的初始内存最大和最小值，通过调整这些参数解决了内存配置超出系统限制的问题，并讨论了在Ant构建过程中遇到的错误及其解决方案。

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

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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 

	<target name="generateActionsXml" depends="init">
		<echo>+---------------------------------------------------
+</echo>
		<echo>|                                                   
|</echo>
		<echo>| G E N E R A T E   C U D S F   X M L               
|</echo>
		<echo>|                                                   
|</echo>
		<echo>+---------------------------------------------------
+</echo>
		<echo>Generating actions xml for ${ant.project.name}</echo>
		<mkdir dir="${cdms.actionsxml.dir}"/>
		<java classname="com.trigent.core.codegen.CreateCUDSFXml" 
fork="true" jvm="${jdk1.5.home}/bin/java.exe" dir="${cdms.home}">
			<jvmarg value="-Xms64m -Xmx512m"/>
			<sysproperty key="log4j.configuration" value="cdms-
log4j.xml"/>
			<arg value="${cdms.actionsxml.dir}"/>
			<arg value="${cdms.actionsxmlschema.prefix}"/>
			<arg value="${cdms.datamodel.xml}"/>
			<classpath>
				<path location="${cdms.src.dir}"/>
				<path location="${cdms.config.dir}"/>
				<path refid="cdms.class.path"/>
			</classpath>
		</java>
		<echo>Generated actions xml for ${ant.project.name}</echo>
	</target>

Comment 1 Jan Mat 2005-03-16 08:12:15 UTC

<jvmarg value=""/> gets only ONE value - maybe with spaces.

Use two <jvmarg value=""/> or a <jvmarg line=""/>.

As the manual sais ...