Android Unable to convert classes into dex format

Hi all,

I have downloaded the latest sample framework from Oculus and loaded it into Unity, when i change to android and build everything is fine, but if i tick the VR Support i get the following error. I have tried with various other samples and examples but they all seem to error like this when enabling VR support at the Android level

I am on a mac 10.11.6, running java version "1.8.0_102", 1.6.0 JDK and have the android SDK installed as part of Android Studio, finally I am using 5.4.0f3 of Unity.

Any help would be great

Code (CSharp):

1.  
2. CommandInvokationFailure: Unable to convert classes into dex format.
3. /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home/bin/java -Xmx2048M -Dcom.android.sdkmanager.toolsdir="/Users/jonny2027/Library/Android/sdk/tools" -Dfile.encoding=UTF8 -jar "/Applications/Unity/PlaybackEngines/AndroidPlayer/Tools/sdktools.jar" -
4.  
5. stderr[
6. Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
7.     at java.lang.ClassLoader.defineClass1(Native Method)
8.     at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
9.     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
10.     at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
11.     at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
12.     at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
13.     at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
14.     at java.security.AccessController.doPrivileged(Native Method)
15.     at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
16.     at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
17.     at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
18.     at java.lang.Class.forName0(Native Method)
19.     at java.lang.Class.forName(Class.java:274)
20.     at SDKMain.main(SDKMain.java:127)
21. ]
22. stdout[
23.  
24. ]
25. UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
26. UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
27. UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
28. UnityEditor.HostView:OnGUI()
29.  

 

Hi Joejo,

I think you are right. I have tried upgrading the sdk and tools but not sure its fixed so might try a fresh android install as I am now getting the following error in the console

Thanks

Jonathan

Code (CSharp):

1. Failed to compile resources with the following parameters:
2. -bootclasspath "/Users/jonny2027/Library/Android/sdk/platforms/android-24/android.jar" -d "/Users/jonny2027/Downloads/OculusSampleFrameworkProject_1.5.0/OculusSampleFrameworkProject/Temp/StagingArea/bin/classes" -source 1.6 -target 1.6 -encoding UTF-8 "com/oculus/Integration/R.java" "com/oculus/SampleFramework/R.java"
3. warning: /Users/jonny2027/Library/Android/sdk/platforms/android-24/android.jar(java/lang/Object.class): major version 52 is newer than 51, the highest major version supported by this compiler.
4.   It is recommended that the compiler be upgraded.
5. warning: /Users/jonny2027/Library/Android/sdk/platforms/android-24/android.jar(java/lang/AutoCloseable.class): major version 52 is newer than 51, the highest major version supported by this compiler.
6.   It is recommended that the compiler be upgraded.
7. 2 warnings
8.  
9. UnityEditor.HostView:OnGUI()
10.  

 

I have just checked again the build tools hasnt been updated so thats probably the problem.

Thanks

 

I have updated everything, build tools, NDK, SDK etc but i still get this message. Any ideas what might be wrong.

 

I had this a few times as well, try doing this worked for me.

- update android SDK
- update java JDK ( this is I think your issue, as is has some java errors )

Also notice you get this dex format error also with the following things:

- windows path too long, so your project path has a too long path ( had this once )
- your apk goes over 2.1gb filesize. Yes I did this once because I was too laze streaming video and added to app instead

Can't think of any other issue causing this dex format error.

 

You should install JDK 8 to solve this particular error.

 

Thanks. All sorted now

 

How you fix it please ..
I have same issue for one week