Java 7 -> Java8 code breakage scenarios

[Maurizio Cimadamore]

On 28/02/13 11:45, Boaz Nahum wrote:
>>   From your email I guessed you had to workaround new bugs. I probably have
>> mis-interpreted. Good to know that everything is looking almost sane on
>> your part.
>>
>>
>> Yes, I hardy can read my own English ...
> Actually, One of dependencies problem I reported may be consider as bug,
> because the missing dependency cause a compiler crash. You helped me to
> find it, see thread:
>
> http://mail.openjdk.java.net/pipermail/compiler-dev/2013-February/005625.html
>
> Once the dependency was added the crash disappeared.
>
> I will trace back all other issues, But it will take some time.
[moving to lambda-dev, which is more appropriate]
I've tried to reproduce something like what you described:

//A.java
public interface A {
     void m();
}

//B.java
public class B implements A {
     @Override
     public void m() { }

     public static void n() { }
}


//C.java
public class C {
     void test(B b) {
         B.n();
     }
}


I've compiled A, B, then only kept classfile for B.class.

Then I tried to compile C.java against B.class - I only got an error 
message like this:

C.java:3: error: cannot access A
         B.n();
          ^
   class file for A not found
1 error

The message goes away if you compile with -source 7. That's 
understandable, no default method lookup in JDK 7.

However I could not reproduce any crash. So it seems like some 
ingredient is missing...

Maurizio

>
> Thanks
> Boaz