--- /dev/null	2016-07-18 08:15:00.740233585 -0700
+++ new/src/jdk.jshell/share/classes/jdk/jshell/execution/JDIEventHandler.java	2016-07-19 16:57:31.542215553 -0700
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jshell.execution;
+
+import java.util.function.Consumer;
+import com.sun.jdi.*;
+import com.sun.jdi.event.*;
+
+/**
+ * Handler of Java Debug Interface events.
+ * Adapted from jdb EventHandler.
+ * Only exit and disconnect events processed.
+ */
+class JDIEventHandler implements Runnable {
+
+    private final Thread thread;
+    private volatile boolean connected = true;
+    private boolean completed = false;
+    private final VirtualMachine vm;
+    private final Consumer<String> reportVMExit;
+
+    /**
+     * Creates an event handler. Start with {@code start()}.
+     *
+     * @param vm the virtual machine for which to handle events
+     * @param reportVMExit callback to report exit/disconnect
+     * (passed true if the VM has died)
+     */
+    JDIEventHandler(VirtualMachine vm, Consumer<String> reportVMExit) {
+        this.vm = vm;
+        this.reportVMExit = reportVMExit;
+        this.thread = new Thread(this, "event-handler");
+    }
+
+    /**
+     * Starts the event handler.
+     */
+    void start() {
+        thread.start();
+    }
+
+    synchronized void shutdown() {
+        connected = false;  // force run() loop termination
+        thread.interrupt();
+        while (!completed) {
+            try {wait();} catch (InterruptedException exc) {}
+        }
+    }
+
+    @Override
+    public void run() {
+        EventQueue queue = vm.eventQueue();
+        while (connected) {
+            try {
+                EventSet eventSet = queue.remove();
+                boolean resumeStoppedApp = false;
+                EventIterator it = eventSet.eventIterator();
+                while (it.hasNext()) {
+                    resumeStoppedApp |= handleEvent(it.nextEvent());
+                }
+
+                if (resumeStoppedApp) {
+                    eventSet.resume();
+                }
+            } catch (InterruptedException exc) {
+                // Do nothing. Any changes will be seen at top of loop.
+            } catch (VMDisconnectedException discExc) {
+                handleDisconnectedException();
+                break;
+            }
+        }
+        synchronized (this) {
+            completed = true;
+            notifyAll();
+        }
+    }
+
+    private boolean handleEvent(Event event) {
+        handleExitEvent(event);
+        return true;
+    }
+
+    private void handleExitEvent(Event event) {
+        if (event instanceof VMDeathEvent) {
+            reportVMExit.accept("VM Died");
+        } else if (event instanceof VMDisconnectEvent) {
+            connected = false;
+            reportVMExit.accept("VM Disconnected");
+        } else {
+            // ignore everything else
+        }
+    }
+
+    private synchronized void handleDisconnectedException() {
+        /*
+         * A VMDisconnectedException has happened while dealing with
+         * another event. We need to flush the event queue, dealing only
+         * with exit events (VMDeath, VMDisconnect) so that we terminate
+         * correctly.
+         */
+        EventQueue queue = vm.eventQueue();
+        while (connected) {
+            try {
+                EventSet eventSet = queue.remove();
+                EventIterator iter = eventSet.eventIterator();
+                while (iter.hasNext()) {
+                    handleExitEvent(iter.next());
+                }
+            } catch (InterruptedException exc) {
+                // ignore
+            } catch (InternalError exc) {
+                // ignore
+            }
+        }
+    }
+}