How to fix "OutOfMemoryError: java heap space" while compiling MonoDroid App in MonoDevelop

Question

When I try to compile (not execute) one of my projects, I recently get the following error:

Tool /usr/bin/java execution started with arguments: -jar /Applications/android-sdk-mac_x86/platform-tools/lib/dx.jar --no-strict --dex --output=obj/Debug/android/bin/classes.dex obj/Debug/android/bin/classes /Developer/MonoAndroid/usr/lib/mandroid/platforms/android-8/mono.android.jar FlurryAnalytics/Jars/FlurryAgent.jar Jars/android-support-v4.jar 

    UNEXPECTED TOP-LEVEL ERROR:
    java.lang.OutOfMemoryError: Java heap space
        at com.android.dx.rop.code.RegisterSpecSet.<init>(RegisterSpecSet.java:49)
        at com.android.dx.rop.code.RegisterSpecSet.mutableCopy(RegisterSpecSet.java:383)
        at com.android.dx.ssa.LocalVariableInfo.mutableCopyOfStarts(LocalVariableInfo.java:169)
        at com.android.dx.ssa.LocalVariableExtractor.processBlock(LocalVariableExtractor.java:104)
        at com.android.dx.ssa.LocalVariableExtractor.doit(LocalVariableExtractor.java:90)
        at com.android.dx.ssa.LocalVariableExtractor.extract(LocalVariableExtractor.java:56)
        at com.android.dx.ssa.SsaConverter.convertToSsaMethod(SsaConverter.java:50)
        at com.android.dx.ssa.Optimizer.optimize(Optimizer.java:99)
        at com.android.dx.ssa.Optimizer.optimize(Optimizer.java:73)
        at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:273)
        at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:134)
        at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:87)
        at com.android.dx.command.dexer.Main.processClass(Main.java:487)
        at com.android.dx.command.dexer.Main.processFileBytes(Main.java:459)
        at com.android.dx.command.dexer.Main.access$400(Main.java:67)
        at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:398)
        at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:131)
        at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:109)
        at com.android.dx.command.dexer.Main.processOne(Main.java:422)
        at com.android.dx.command.dexer.Main.processAllFiles(Main.java:333)
        at com.android.dx.command.dexer.Main.run(Main.java:209)
        at com.android.dx.command.dexer.Main.main(Main.java:174)
        at com.android.dx.command.Main.main(Main.java:91)

Other projects build as expected. I think I need to increase the heap size for this java build step? But how?

No large images in the App. Mind that it's a compile time error and has nothing to do with executing the App on the device. — Rodja, Nov 23 '12 at 06:55

score 20 · Accepted Answer · answered Jul 18 '14 at 20:45

20

There is an option in Xamarin Studio to increase the Java Heap Size.

Project Options -> Android Build -> Advanced -> Java Heap Size.

enter image description here

answered Jul 18 '14 at 20:45

Hemerson Varela

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I use this UI setting for quite a while now. Much better than exporting the _JAVA_OPTIONS! – Rodja Jul 19 '14 at 05:25
What value to put here? – Sergey Metlov Mar 27 '15 at 13:28
1

Ok, `1G` was enough for me. – Sergey Metlov Mar 27 '15 at 13:30
2

In Visual Studio, this is on Project Properties / Android Options / Advanced tab. – GregHNZ Jan 20 '16 at 03:09
1

Be mindful of the selected configuration. In the picture above, Debug configuration is selected, make sure to also change the value for Release so that your release build also uses the increased value. – Yves Rochon Oct 04 '16 at 15:53

score 5 · Answer 2 · edited May 23 '17 at 12:34

This suggestion did the trick:

$ export _JAVA_OPTIONS="-Xmx1g"
$ /Applications/MonoDevelop.app/Contents/MacOS/MonoDevelop

I have a few jar files in my project. Flurry, Maps and Newtonsoft... aparently this is enough to bomb the build.

Thanks to the awesome Xamarin Support team for their quick response and pointing out the solution! They are working on reducing the needed memory footprint for external jars.

How to fix "OutOfMemoryError: java heap space" while compiling MonoDroid App in MonoDevelop

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