Hi Georgiy,
On 04/01/2016 04:52 PM, Georgiy Rakov wrote:
Hello,
currently inner classes are allowed to be specified in 'uses'
statement, for instance following code is compiled successfully by
JDKb111 javac:
a/module-info.java:
module a {
uses pkg.Outer.Inner;
}
a/pkg/Outer.java:
package pkg;
public class Outer{ public class Inner{} }
Spec doesn't prevent it either. However in 1.1.3
<http://cr.openjdk.java.net/%7Emr/jigsaw/spec/lang-vm.html> it
prevents implementations specified in 'provides' statement to be inner
classes. According to my understanding inner class cannot be extended
by non-inner class, for instance "public class Impl extends
Outer.Inner { } " would cause:
error: an enclosing instance
that contains Outer.Inner is required
class Implem extends Outer.Inner {}
^
1 error
So could you please tell what is the purpose of allowing inner classes
to be specified in 'uses' statement, there seem to be no way to create
its implementation. Should it be prohibited by spec?
The minimized testcase is attached; in order to run it please:
1. unzip attached archive on Windows machine;
2. rename test12\test_bat to test12\test.bat;
3. modify test.bat by changing JDK_HOME variable to point to your JDK
installation;
4. run test.bat.
Thank you,
Georgiy.
Not only in 'uses' statement. It would be impossible to specify them in
'provides ... with ...' statement as implementation classes too as they
by definition can't be instantiated without an outer instance (their
constructors always contain an implicit parameter - the outer instance).
What does compiler say for such case?
a/module-info.java:
module a {
exports pkg;
provides pkg.Service with pkg.impl.Outer.Inner;
}
a/pkg/Service.java:
package pkg;
public interface Service {}
a/pkg/impl/Outer.java:
package pkg.impl;
public class Outer { public class Inner implements pkg.Service { } }
Regards, Peter
