Shay Banon created LUCENE-5086:
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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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