Gradle Build Error with NoClassDefFoundError for sun.awt.X11GraphicsEnvironment in: mergeDebugResources

Question

I always get this error when I try to build microG :

$ ./gradlew build Skipping debug jar:microg-ui-tools:preBuild UP-TO-DATE :microg-ui-tools:preDebugBuild UP-TO-DATE :microg-ui-tools:checkDebugManifest :microg-ui-tools:preDebugAndroidTestBuild UP-TO-DATE :microg-ui-tools:preDebugUnitTestBuild UP-TO-DATE :microg-ui-tools:preReleaseBuild UP-TO-DATE :microg-ui-tools:preReleaseUnitTestBuild UP-TO-DATE :microg-ui-tools:prepareComAndroidSupportAnimatedVectorDrawable2531Library :microg-ui-tools:prepareComAndroidSupportAppcompatV72531Library :microg-ui-tools:prepareComAndroidSupportPreferenceV142531Library :microg-ui-tools:prepareComAndroidSupportPreferenceV72531Library :microg-ui-tools:prepareComAndroidSupportRecyclerviewV72531Library :microg-ui-tools:prepareComAndroidSupportSupportCompat2531Library :microg-ui-tools:prepareComAndroidSupportSupportCoreUi2531Library :microg-ui-tools:prepareComAndroidSupportSupportCoreUtils2531Library :microg-ui-tools:prepareComAndroidSupportSupportFragment2531Library :microg-ui-tools:prepareComAndroidSupportSupportMediaCompat2531Library :microg-ui-tools:prepareComAndroidSupportSupportV42531Library :microg-ui-tools:prepareComAndroidSupportSupportVectorDrawable2531Library :microg-ui-tools:prepareComTakisoftFixPreferenceV725310Library :microg-ui-tools:prepareDebugDependencies :microg-ui-tools:compileDebugAidl UP-TO-DATE :microg-ui-tools:compileDebugNdk UP-TO-DATE :microg-ui-tools:compileLint UP-TO-DATE :microg-ui-tools:copyDebugLint UP-TO-DATE :microg-ui-tools:compileDebugRenderscript UP-TO-DATE :microg-ui-tools:generateDebugBuildConfig UP-TO-DATE :microg-ui-tools:generateDebugResValues UP-TO-DATE :microg-ui-tools:generateDebugResources UP-TO-DATE :microg-ui-tools:mergeDebugResources java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment :microg-ui-tools:mergeDebugResources FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':microg-ui-tools:mergeDebugResources'. > java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED Total time: 2.932 secs 

This is on a headless server that does not even have an X server installed! This happens for release (except for mergeReleaseResources ). I tried working with --info and --debug , but it did not bring me anything useful. I also tried switching to using Oracle JDK instead of OpenJDK and installing a local X server on the machine, but that didn't change anything either. This is on a recently cloned copy of the repo, although I don't think the bug is specific to microG.

Here are my results: ./gradlew build --stacktrace : https://gist.github.com/milkey-mouse/cb6b75b5116cf369603dec46e214e914

Answer 1

You can try adding -Djava.awt.headless=true to the jvmargs file in gradle.properties :

 org.gradle.jvmargs=-Djava.awt.headless=true 

Also consider an example here .

Here is a similar question , but not Gradle related.