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Hello,

I'm not sure if it's a right place to ask, but let me try. I'm using RetroLambda in order to backport some of my code to Java 6. During backporting of a particular class I'm getting the following exception:

java.lang.RuntimeException: Failed to backport class: lsh/gtfs/data/feed/CsvDeserializer
	at net.orfjackal.retrolambda.Transformers.transform(Transformers.java:129)
	at net.orfjackal.retrolambda.Transformers.transform(Transformers.java:107)
	at net.orfjackal.retrolambda.Transformers.backportClass(Transformers.java:47)
	at net.orfjackal.retrolambda.Retrolambda.run(Retrolambda.java:92)
	at net.orfjackal.retrolambda.Main.main(Main.java:28)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 28
	at net.orfjackal.retrolambda.asm.ClassReader.readLabel(ClassReader.java:2251)
	at net.orfjackal.retrolambda.asm.ClassReader.readTypeAnnotations(ClassReader.java:1678)
	at net.orfjackal.retrolambda.asm.ClassReader.readCode(ClassReader.java:1210)
	at net.orfjackal.retrolambda.asm.ClassReader.readMethod(ClassReader.java:1032)
	at net.orfjackal.retrolambda.asm.ClassReader.accept(ClassReader.java:708)
	at net.orfjackal.retrolambda.asm.ClassReader.accept(ClassReader.java:521)
	at net.orfjackal.retrolambda.Transformers.lambda$transform$4(Transformers.java:107)
	at net.orfjackal.retrolambda.Transformers.transform(Transformers.java:125)

Please note that the array index 28 may be different depending on a length of the method that fails to be backported (if I'm not mistaken while trying to narrow down).

Here is the class that fails (it shrank a lot and now looks weird):

final class CsvDeserializer
		implements IDeserializer<Map<String, String>> {

	private static final IDeserializer<Map<String, String>> instance = new CsvDeserializer();

	private CsvDeserializer() {
	}

	static IDeserializer<Map<String, String>> get() {
		return instance;
	}

	@Nonnull
	@Override
	public CalendarDate toCalendarDate(@Nonnull final Map<String, String> row) {
		@Nonnull
		@Id LocalDate date = As.id(null); // a factory method to check legal values assignment (ids can be only assigned to ids) using Checker Framework 
		assert date != null; // keep javac from discarding the `date` reference
		return null; // no need to instantiate for testing purposes
	}

}

Once I remove the @Id annotation from the date reference, it succeeds. However, if I, for example, move the same code to another method (cannot see the reasons clear, and not sure how do I do it) or change the @Id retention policy to SOURCE (actually Checker Framework requires CLASS to work across modules), it succeeds too. The @Id annotation is declared as follows:

@SubtypeOf(Any.class)
@Target({ ElementType.TYPE_USE, ElementType.TYPE_PARAMETER })
public @interface Id {
}

How I run it:

java \
	-Dretrolambda.bytecodeVersion=50 \
	-Dretrolambda.classpath=input \
	-Dretrolambda.defaultMethods=true \
	-Dretrolambda.inputDir=input \
	-Dretrolambda.outputDir=output \
	-jar retrolambda-2.5.4.jar[javacbug.zip](/uploads/0a023a9ee93c395aca5d280977aec740/javacbug.zip)

My toolchain:

• Retrolambda 2.5.4 with transitive asm-debug-all:5.2
• Oracle JDK 1.8.0_151 (Windows/Linux; x64)

I tried to rebuild Retrolambda 2.5.5-SNAPSHOT with asm-debug-all:6.0_BETA -- the effect is the same.

(Not sure, Retrolambda seems to be unable to be easily upgraded to a newer asm 6+ -- it can use 5.2 only.)

Could you please confirm the issue?

Thanks.

CsvDeserializer.class