hg: kulla/dev/langtools: Reenable debugging support. Exit gracefully (no NPEs) on JDI start-up failure.

[robert.field at oracle.com]

Changeset: cc9ad7d35093
Author:    rfield
Date:      2015-06-23 11:46 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/cc9ad7d35093

Reenable debugging support.  Exit gracefully (no NPEs) on JDI start-up failure.

! src/jdk.jshell/share/classes/jdk/internal/jshell/impl/JDIExecution.java
! src/jdk.jshell/share/classes/jdk/internal/jshell/impl/JShellFactory.java
! test/jdk/jshell/StopExecutionTest.java