title: java.exe finished with non-zero exit value 2 when using Facebook SDK
body: <p>When I try to compile my app I get a following error</p>
  
  <pre><code>Error:Execution failed for task ':app:dexDebug'.
  &gt; com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.7.0_60\bin\java.exe'' finished with non-zero exit value 2
  </code></pre>
  
  <p>If I get rid of Facebook Android SDK it compiles without a problem.</p>
  
  <p>My build.gradle:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 21 //tried 19 and 22 changing targetSdkVersion and buildToolsVersion accordingly
      buildToolsVersion "21.1.2"
  
      defaultConfig {
          applicationId "..."
          minSdkVersion 15
          targetSdkVersion 21
      }
  
      buildTypes {
          release {
              minifyEnabled true
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
          }
      }
  
  ...
  
  }
  
  dependencies {
      ...
      compile 'com.facebook.android:facebook-android-sdk:3.23.1' //tried older versions as well
  }
  </code></pre>