“java.exe” exited with code 2 Xamarin.Android proj

问题:

so I have my Xamarin.Android project which contains several libraries. When I try to build I receive an error which says "java.exe" exited with code 2.

After some hours of google research I found out that I could enable Multidex. According to the blog entry of Jon Doublas I did the steps mentioned. http://www.jon-douglas.com/2016/09/05/xamarin-android-multidex/

According to the blog entry Android API Level > 21 handles Multidex itself. Well my experience is that it does not. I am building on API Level 25 and get the same error again and again with the same information. The steps in the article do not help. It seems like Xamarin.Android does not support Multidex.

It seems like you have to handle Multidex by yourself but I haven't found any solution which is working. Dos anybody found a solution which works?

I am using Xamarin 4.6 and Visual studio 2017.

回答1:

Found the answer after about 20 hours of searching in my project.. So here are the steps to resolve the problem "java.exe" exited with code 2

1) Change the MainDexClasses.bat as descriped in the link:

http://www.jon-douglas.com/2016/09/05/xamarin-android-multidex/

2) Make sure you have enabled Multi-Dex Option in your Android Application - !!! Have a look at the .csprj file if MultiDex is set to true (in my case it wasn't even if i enabled Multi-Dex)

3) Add the following part in your AndroidManifest file

<application android:name="android.support.multidex.MultiDexApplication"></application>

This will tell your android-project to actually use the MultiDex-Option given.

After a clean and build I was able to run my application as it is.

回答2:

After finding this question and @Daniel_97s answer I was able to solve this error only by adding multidex to the project without changing MainDexClasses.bat:

1. Check the option in Project Options:

2. Add MultiDexApplication to Android Manifest:

   <application android:name="android.support.multidex.MultiDexApplication"></application>
   

Note I was getting this error code 2 on Visual Studio for Mac and on Windows the same app was building successfully. (why?)

回答3:

I only go to option > Build > Android Build and check Enable Multi-Dex it will resolve

回答4:

The solution in my case was to disable the "Sign the .APK file using the following keystore details". Because the keystore location and/or password was incorrect, java.exe exited with code 2.

回答5:

Reassign the path of the keystore worked for me

==EDIT 01==

Double click on Android Project > Android Package Signing

On the Keystore path, don't know why but apparently the path was wrong, I re-select the .keystore file again from the same path, and the error "exited with code 2" went away and I was able to Archive for release

回答6:

Please Update your Visual Studio to Latest version, if you are still using an old version.

If you think there is no solution then go and enable the Multidex