打包出错

问题：Android studio 打包是报错

Error:Execution failed for task ':app:transformClassesWithDexForRelease'.

> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: Error while executing java process with main class com.android.dx.command.Main with arguments {--dex --num-threads=4 --multi-dex --main-dex-list E:\studio_mywork6\HarmlessManageSys\app\build\intermediates\multi-dex\release\maindexlist.txt --output E:\studio_mywork6\HarmlessManageSys\app\build\intermediates\transforms\dex\release\0 --min-sdk-version 19 E:\studio_mywork6\HarmlessManageSys\app\build\intermediates\transforms\jarMerging\release\0.jar}

解决方法：

一、dex文件分包

1、defaultConfig {
    multiDexEnabled true
}

2、dexOptions {
    //Warning:The `android.dexOptions.incremental` property is deprecated
    // and it has no effect on the build process.
    javaMaxHeapSize "4g"
    preDexLibraries = false
}

3、compile 'com.android.support:multidex:1.0.3'

4、App extends MultiDexApplication

二、看是否 gradle.properties 文件缺失

三、gradle.properties里配置

org.gradle.jvmargs 的大小问题