[ping] RE: RFR(S): 8204268: Improve some InompatibleClassChangeError messages.

[Lindenmaier, Goetz]

Hi Harold, Thomas,

I adapted the error messages slightly:
http://cr.openjdk.java.net/~goetz/wr18/8204268-exMsg-IncompatibleClassChange/02/

As requested by Harold:
- "Class %s implements %s, which is not an interface"
+ "Class %s can not implement %s, because it is not an interface"
I thought the original message was not that bad, as the classfile actually lists
the second type as "implements". 

As proposed by Thomas:
"Can not call method because resolved class %s does not implement  the interface %s defining the method"
"Receiver class %s does not implement the interface %s defining the method to be called"
I shortened the message, but I think it is important tell that the problem
arose during method resolving.
I also changed resolved -> receiver, which was just wrong.

Best regards,
  Goetz.

> -----Original Message-----
> From: hotspot-runtime-dev [mailto:hotspot-runtime-dev-
> bounces at openjdk.java.net] On Behalf Of Harold David Seigel
> Sent: Donnerstag, 14. Juni 2018 18:00
> To: hotspot-runtime-dev at openjdk.java.net
> Subject: Re: [ping] RE: RFR(S): 8204268: Improve some
> InompatibleClassChangeError messages.
> 
> Hi Goetz,
> 
> This change looks good.  Just a few comments.
> 
> In classFileParser.cpp, line 958, could you change "implements %s, which
> is not an interface" to "can not implement %s because it is not an
> interface" ?
> 
> Note that the calls to class_loader_and_module_name() in this webrev may
> get changed in the near future as part of JDK-8202605
> <https://bugs.openjdk.java.net/browse/JDK-8202605> and JDK-8169559
> <https://bugs.openjdk.java.net/browse/JDK-8169559>.
> 
> Thanks, Harold
> 
> On 6/11/2018 9:30 AM, Lindenmaier, Goetz wrote:
> > Hi,
> >
> > could I please get a second opinion on this?
> >
> > Best regards,
> >    Goetz.
> >
> >> -----Original Message-----
> >> From: Lindenmaier, Goetz
> >> Sent: Montag, 4. Juni 2018 11:38
> >> To: hotspot-runtime-dev at openjdk.java.net
> >> Subject: RFR(S): 8204268: Improve some InompatibleClassChangeError
> >> messages.
> >>
> >> Hi,
> >>
> >> This change improves some IncompatibleClassChangeError messages by
> >> printing the classes involved
> >> and adds tests for the messages. It also improves the existing test for
> >> IncompatibleClassChangeErrorMessages,
> >> e.g. by assuring packages are printed with '.'. I'm using
> >> class_loader_and_module_name() for printing the
> >> class names.
> >>
> >> http://cr.openjdk.java.net/~goetz/wr18/8204268-exMsg-
> >> IncompatibleClassChange/01/
> >>
> >> Changes to the messages:
> >>
> >> 1. If a class is loaded requiring an interface that's already loaded as class:
> >>
> >> Before:
> >>
> >> Implementing class
> >>
> >> After:
> >>
> >> Class test.ICC3_B implements test.ICC3_A, which is not an interface
> >>
> >> 2. If a class is loaded requiring a super class that's already loaded as
> interface.
> >> Implemented a test. Message unchanged:
> >>
> >> class test.ICC4_B has interface test.ICC4_iA as super class
> >>
> >> 3. If an interface method is called but the class of the object at runtime
> >> does not implement the interface. There was no message before.
> >>
> >> After:
> >>
> >> Can not call method because resolved class test.ICC5_B does not
> implement
> >> the interface test.ICC4_iA defining the method.
> >>
> >> No test implemented for this message
> >>
> >> Feel free to propose better message.