Improve JSR-223 exception messages

[headius]

Basically just adding the topmost Ruby frame's file and line to the message, to match e.g. Jython.

Existing tests do not seem to supply a filename for the top script, so I can only confirm the nameless version of this message is working:

[INFO] Running org.jruby.embed.jsr223.JRubyEngineTest
javax.script.ScriptException: Error during evaluation of Ruby at <script> at 2: (RuntimeError) hello from ruby

Fixes #6560

[headius]

Dummy test to just print the exception... hoping for more tests that exercise this better...

diff --git a/core/src/test/java/org/jruby/embed/jsr223/JRubyEngineTest.java b/core/src/test/java/org/jruby/embed/jsr223/JRubyEngineTest.java
index 81202a22e6..0f6790321b 100644
--- a/core/src/test/java/org/jruby/embed/jsr223/JRubyEngineTest.java
+++ b/core/src/test/java/org/jruby/embed/jsr223/JRubyEngineTest.java
@@ -619,6 +619,22 @@ public class JRubyEngineTest extends BaseTest {
         }
     }
 
+    /**
+     * Test of invokeMethod method throwing an exception with a null message.
+     */
+    @Test
+    public void testInvokeMethodWithRubyException() throws Exception {
+        ScriptEngine instance = newScriptEngine();
+        instance.eval("def trigger_raise\nraise 'hello from ruby'\nend");
+        try {
+            ((Invocable) instance).invokeMethod(Object.class,"trigger_raise", null);
+            fail("Expected javax.script.ScriptException");
+        } catch (javax.script.ScriptException sex) {
+            sex.printStackTrace();
+            // javax.script.ScriptException is expected
+        }
+    }
+
     /**
      * Test of invokeFunction method, of class Jsr223JRubyEngine.
      */