hg: jdk/sandbox: 8221368: Error message when module main class cannot be loaded is missing exception details

[chris.hegarty at oracle.com]

Changeset: 6c2d69a41ff9
Author:    mchung
Date:      2019-06-05 07:49 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/6c2d69a41ff9

8221368: Error message when module main class cannot be loaded is missing exception details
Reviewed-by: alanb, sundar

! src/java.base/share/classes/sun/launcher/LauncherHelper.java
! src/java.base/share/classes/sun/launcher/resources/launcher.properties
+ test/jdk/tools/launcher/modules/basic/LauncherErrors.java
+ test/jdk/tools/launcher/modules/basic/src/test2/jdk/test2/Main.java
+ test/jdk/tools/launcher/modules/basic/src/test2/module-info.java