Default package causes problems

[JakeWharton]

java.lang.RuntimeException: Failed to backport class: Example
    at net.orfjackal.retrolambda.Transformers.transform(Transformers.java:128)
    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:77)
    at net.orfjackal.retrolambda.Main.main(Main.java:26)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
    at java.lang.String.substring(String.java:1955)
    at net.orfjackal.retrolambda.lambdas.BackportLambdaInvocations.isNonOwnedMethodVisible(BackportLambdaInvocations.java:107)
    at net.orfjackal.retrolambda.lambdas.BackportLambdaInvocations.getLambdaAccessMethod(BackportLambdaInvocations.java:66)
    at net.orfjackal.retrolambda.lambdas.BackportLambdaInvocations$InvokeDynamicInsnConverter.backportLambda(BackportLambdaInvocations.java:169)
    at net.orfjackal.retrolambda.lambdas.BackportLambdaInvocations$InvokeDynamicInsnConverter.visitInvokeDynamicInsn(BackportLambdaInvocations.java:160)
    at net.orfjackal.retrolambda.asm.ClassReader.readCode(ClassReader.java:1452)
    at net.orfjackal.retrolambda.asm.ClassReader.readMethod(ClassReader.java:1017)
    at net.orfjackal.retrolambda.asm.ClassReader.accept(ClassReader.java:693)
    at net.orfjackal.retrolambda.asm.ClassReader.accept(ClassReader.java:506)
    at net.orfjackal.retrolambda.Transformers.lambda$transform$5(Transformers.java:107)
    at net.orfjackal.retrolambda.Transformers$$Lambda$8/1530388690.accept(Unknown Source)
    at net.orfjackal.retrolambda.Transformers.transform(Transformers.java:124)
    ... 4 more

Pretty sure this is my fault! We should be checking for -1 from indexOf before calling substring. Unlikely to be hit in production because no one should be using the default package! I found it while working on content for a presentation.

I'll send a fix later this week or next if someone doesn't beat me to it.

[csoroiu]

I stepped into this today while performing a build using retrolambda maven plugin v2.3.0.

[luontola]

This has been included in Retrolambda 2.4.0. Sorry about taking so long to merge.