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From "Shay Banon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-5086) RamUsageEstimator causes AWT classes to be loaded by calling ManagementFactory#getPlatformMBeanServer
Date Mon, 01 Jul 2013 17:14:20 GMT
Shay Banon created LUCENE-5086:
----------------------------------

             Summary: RamUsageEstimator causes AWT classes to be loaded by calling ManagementFactory#getPlatformMBeanServer
                 Key: LUCENE-5086
                 URL: https://issues.apache.org/jira/browse/LUCENE-5086
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Shay Banon


Yea, that type of day and that type of title :).

Since the last update of Java 6 on OS X, I started to see an annoying icon pop up at the doc
whenever running elasticsearch. By default, all of our scripts add headless AWT flag so people
will probably not encounter it, but, it was strange that I saw it when before I didn't.

I started to dig around, and saw that when RamUsageEstimator was being loaded, it was causing
AWT classes to be loaded. Further investigation showed that actually for some reason, calling
ManagementFactory#getPlatformMBeanServer now with the new Java version causes AWT classes
to be loaded (at least on the mac, haven't tested on other platforms yet). 

There are several ways to try and solve it, for example, by identifying the bug in the JVM
itself, but I think that there should be a fix for it in Lucene itself, specifically since
there is no need to call #getPlatformMBeanServer to get the hotspot diagnostics one (its a
heavy call...).

Here is a simple call that will allow to get the hotspot mxbean without using the #getPlatformMBeanServer
method, and not causing it to be loaded and loading all those nasty AWT classes:

[code]
    Object getHotSpotMXBean() {
        Object hotSpotBean = null;
        try {
            // Java 6
            Class sunMF = Class.forName("sun.management.ManagementFactory");
            return sunMF.getMethod("getDiagnosticMXBean").invoke(null);
        } catch (Throwable t) {
            // ignore
        }
        // potentially Java 7
        try {
            return ManagementFactory.class.getMethod("getPlatformMXBean", Class.class).invoke(null,
Class.forName("com.sun.management.HotSpotDiagnosticMXBean"));
        } catch (Throwable t) {
            // ignore
        }
        return null;
    }
[/code]

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