Description Krzysztof Szafranski 2015-07-28 08:39:03 EDT

Created attachment 255478 [details]
Examples reproducing the issue

This issue appears when we are passing a result of a type-parameterized method directly to a varargs method. The behavior is different when compiling with javac and with ajc.

When I compile and run the attached file with javac (1.8.0_40) everything works fine. But when I compile it with ajc:
java -jar /path/to/aspectjtools-1.8.5.jar GenericVarargsBug.java -1.8

I'm getting ClassCastException:
Exception in thread "main" java.lang.ClassCastException: [B cannot be cast to [Ljava.lang.Object;
	at GenericVarargsBug.main(GenericVarargsBug.java:9)

It seems that while javac treats the byte array as a single Object argument to the varargs method, ajc tries to cast it to Object array.

The issue does not appear when the result of sth.get(0) is saved to an intermediary variable, e.g.:
byte[] first = sth.get(0);
isItWorking(first);

I'm also attaching two more examples of how to reproduce this issue.