diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/jdk.jconsole/share/classes/sun/tools/jconsole/OutputViewer.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jconsole/share/classes/sun/tools/jconsole/OutputViewer.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2006, 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 sun.tools.jconsole;
+
+import java.awt.Font;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.io.*;
+
+import javax.swing.*;
+
+/**
+ * A simple console window to display messages sent to System.out and
+ * System.err.
+ *
+ * A stop-gap solution until an error dialog is implemented.
+ */
+public class OutputViewer {
+    private static JFrame frame;
+    private static JTextArea ta;
+
+    static {
+        System.setOut(PipeListener.create("System.out"));
+        System.setErr(PipeListener.create("System.err"));
+    }
+
+    // Dummy to cause class to be loaded
+    public static void init() { }
+
+    private static void append(String s) {
+        if (frame == null) {
+            // FIXME: The frame title should be a localized string.
+            frame = new JFrame("JConsole: Output");
+            ta = new JTextArea();
+            ta.setEditable(false);
+            frame.getContentPane().add(new JScrollPane(ta));
+            ta.setFont(new Font("Monospaced", Font.BOLD, 14));
+            frame.setSize(500, 600);
+            frame.setLocation(1024-500, 768-600);
+            // Exit JConsole if no window remains.
+            // e.g. jconsole -version only creates the OutputViewer
+            // but no other window.
+            frame.addWindowListener(new WindowAdapter() {
+                public void windowClosing(WindowEvent e) {
+                    if (JFrame.getFrames().length == 1) {
+                        System.exit(0);
+                    }
+                }
+            });
+        }
+        ta.append(s);
+        ta.setCaretPosition(ta.getText().length());
+        frame.setVisible(true);
+    }
+
+    private static void appendln(String s) {
+        append(s+"\n");
+    }
+
+    private static class PipeListener extends Thread {
+        public PrintStream ps;
+        private String name;
+        private PipedInputStream inPipe;
+        private BufferedReader br;
+
+        public static PrintStream create(String name) {
+            return new PipeListener(name).ps;
+        }
+
+        private PipeListener(String name) {
+            this.name = name;
+
+            try {
+                inPipe = new PipedInputStream();
+                ps = new PrintStream(new PipedOutputStream(inPipe));
+                br = new BufferedReader(new InputStreamReader(inPipe));
+            } catch (IOException e) {
+                appendln("PipeListener<init>("+name+"): " + e);
+            }
+            start();
+        }
+
+        public void run() {
+            try {
+                String str;
+                while ((str = br.readLine()) != null) {
+                    appendln(str);
+
+                    // Hack: Turn off thread check in PipedInputStream.
+                    // Any thread should be allowed to write except this one
+                    // but we just use this one to keep the pipe alive.
+                    try {
+                        java.lang.reflect.Field f =
+                            PipedInputStream.class.getDeclaredField("writeSide");
+                        f.setAccessible(true);
+                        f.set(inPipe, this);
+                    } catch (Exception e) {
+                        appendln("PipeListener("+name+").run: "+e);
+                    }
+                }
+                appendln("-- "+name+" closed --");
+                br.close();
+            } catch (IOException e) {
+                appendln("PipeListener("+name+").run: "+e);
+            }
+        }
+    }
+}