ndk-samples: Sample hello-jni won't compile

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000)
        at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:472)
        at com.android.dx.cf.direct.DirectClassFile.parse(DirectClassFile.java:406)
        at com.android.dx.cf.direct.DirectClassFile.parseToInterfacesIfNecessary(DirectClassFile.java:388)
        at com.android.dx.cf.direct.DirectClassFile.getMagic(DirectClassFile.java:251)
        at com.android.dx.command.dexer.Main.processClass(Main.java:704)
        at com.android.dx.command.dexer.Main.processFileBytes(Main.java:673)
        at com.android.dx.command.dexer.Main.access$300(Main.java:83)
        at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:602)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:170)
        at com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
        at com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
        at com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
        at com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
        at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
        at com.android.dx.command.dexer.Main.processOne(Main.java:632)
        at com.android.dx.command.dexer.Main.processAllFiles(Main.java:510)
        at com.android.dx.command.dexer.Main.runMonoDex(Main.java:280)
        at com.android.dx.command.dexer.Main.run(Main.java:246)
        at com.android.dx.command.dexer.Main.main(Main.java:215)
        at com.android.dx.command.Main.main(Main.java:106)
...while parsing com/example/hellojni/R.class

6 errors; aborting               

:app:dexAllDebug FAILED          

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:dexAllDebug'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_45\bin\java.exe'' finished with non-zero exit value 1

* 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: 6.0 secs