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https://issues.apache.org/jira/browse/LUCENE-5086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss reassigned LUCENE-5086:
-----------------------------------
Assignee: Dawid Weiss
> 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
> Assignee: Dawid Weiss
>
> 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() {
> 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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