Android Studio Error -- Could not create the Java Virtual Machine

:app:dexDebug
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:dexDebug'.
> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
    E:Program Filesadt-bundle-windows-x86-20140702sdkuild-tools21.1.2dx.bat --dex --no-optimize --output E:androidworkspaceDialogDemoappuildintermediatesdexdebug --input-list=E:androidworkspaceDialogDemoappuildintermediates	mpdexdebuginputList.txt
Error Code:
    1
Output:
    Error: Could not create the Java Virtual Machine.
    Error: A fatal exception has occurred. Program will exit.


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Gradle打包的时候经常出现此错误，命令--stacktrace

Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

目前google and 百度查询有两种解决方案

1.设置java的

-Xms128m
-Xmx512m
-XX:MaxPermSize=250m

修改这三个参数

2.升级JDK

经过测试2种方案都不行

通过

dx.bat --dex

命令的dx.bat脚本有这样一句代码

REM By default, give dx a max heap size of 1 gig and a stack size of 1meg.
rem This can be overridden by using "-JXmx..." and "-JXss..." options below.
set defaultXmx=-Xmx1024M
set defaultXss=-Xss1m

set defaultXmx=-Xmx1024M

原因就是此处设置的Xmx为1024M，编译打包APK时java虚拟机内存空间不足，修改为512M即可正常编译打包了。

set defaultXmx=-Xmx512M