Build errors when using Android Built tools 3.0.0-beta1

[peterhav]

When using the 3.0.0-beta1, API 23 or lower and the following statement in the build.gradle file:

compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
}

causes the following exception during a build:

:app:transformClassesWithDesugarForDebug
Exception in thread "main" java.lang.IllegalStateException: Expect only the fields in this interface to be initialized. owner=org/apache/xmlbeans/impl/xb/ltgfmt/Code$1, expected=org/apache/xmlbeans/impl/xb/ltgfmt/Code
	at com.google.common.base.Preconditions.checkState(Preconditions.java:721)
	at com.google.devtools.build.android.desugar.InterfaceDesugaring$InterfaceFieldWriteCollector.visitFieldInsn(InterfaceDesugaring.java:260)
	at org.objectweb.asm.MethodVisitor.visitFieldInsn(Unknown Source)
	at org.objectweb.asm.tree.FieldInsnNode.accept(Unknown Source)
	at org.objectweb.asm.tree.InsnList.accept(Unknown Source)
	at org.objectweb.asm.tree.MethodNode.accept(Unknown Source)
	at com.google.devtools.build.android.desugar.LambdaDesugaring$InvokedynamicRewriter.visitEnd(LambdaDesugaring.java:383)
	at org.objectweb.asm.ClassReader.b(Unknown Source)
	at org.objectweb.asm.ClassReader.accept(Unknown Source)
	at org.objectweb.asm.ClassReader.accept(Unknown Source)
	at com.google.devtools.build.android.desugar.Desugar.desugarClassesInInput(Desugar.java:401)
	at com.google.devtools.build.android.desugar.Desugar.desugarOneInput(Desugar.java:326)
	at com.google.devtools.build.android.desugar.Desugar.desugar(Desugar.java:280)
	at com.google.devtools.build.android.desugar.Desugar.main(Desugar.java:583)


 FAILED

FAILURE: Build failed with an exception.

Steps to reproduce:
-create a new Sample project (API 23, no activity) in Android Studio using build tools 3.0.0-beta1 (note: problem only occurs when API < 24)
-add multidex to the build.gradle
-add the provided poishadow-all.jar to the libs dir
-run gradle assembleDebug: it will run fine
-add these lines to the build.gradle file:

 compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
}

-run gradle assembleDebug: it show the exception.

When the minsdk is changed to >23 the build will run fine.

[peterhav]

Since I'm not sure if this is a problem in this project or in the Google build system, I also created a bug report in the Google issue tracker. It can be tracked here: https://issuetracker.google.com/issues/64552338

[peterhav]

Just received notice that this is related to a bug. It should be solved in build tools 3.0.0-beta4...

[centic9]

Thanks for the note, I also expected it to be more related to the build tools themselves.