added check that pure virtual method is handled by throwing an exception if Java derived class does not provide an implementation

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@5289 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/java/director_abstract_runme.java

@@ -23,6 +23,15 @@ public class director_abstract_runme {
       if (!a.pong().equals("Foo::pong();MyFoo::ping()")) {
           throw new RuntimeException ( "a.pong()" );
       }
+
+      BadFoo b = new BadFoo();
+      try {
+        b.ping();
+        System.out.println( "Test failed. An attempt to call a pure virtual method should throw an exception" );
+        System.exit(1);
+      }
+      catch (RuntimeException e) {
+      }
   }
 }
 
@@ -32,3 +41,6 @@ class MyFoo extends Foo {
     }
 }
 
+class BadFoo extends Foo {
+}
+