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OOM error Finalizer [message #1827627]

Tue, 19 May 2020 14:06

Rinchin Gomboev

Messages: 1
Registered: May 2020

Junior Member

I tried to find How to analyze a memory leak through Eclipse Mat.
I have hprof file.
index.php/fa/38148/0/

MAT says
The class "java.lang.ref.Finalizer", loaded by "<system class loader>", occupies 343,930,680 (68.96%) bytes.
Keywords
java.lang.ref.Finalizer

How I can through this information find the place in code which I can fix. I found through
SELECT OBJECTS referent FROM INSTANCEOF java.lang.ref.Finalizer all objects that Finalizer wants to finalize().
Pressing show as histagram I grouped these all.

But how I can find which of this objects stucks through finalize process? And in which place in my code?

Thank you very much.

Attachment: Снимок экрана 2020-05-19 в 15.43.17.png
(Size: 48.63KB, Downloaded 1745 times)

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Re: OOM error Finalizer [message #1827794 is a reply to message #1827627]

Sun, 24 May 2020 09:39

Andrew Johnson

Messages: 205
Registered: July 2009

Senior Member

Have you tried running the 'Finalizer Overview' query?
Query Browser > Java Basics > Finalizer Overview

Analyzing Finalizer help

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Re: OOM error Finalizer [message #1828205 is a reply to message #1827627]

Wed, 03 June 2020 22:57

Romit Saha

Messages: 2
Registered: June 2020

Junior Member

I am facing a similar kind of issue, where the Finalizer() thread is stuck. I think it is due to thread blocking. But dont know what is causing the issue. any help ?

Attachment: Leak.png
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Attachment: FinalizerOverview.png
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Attachment: ThreadOverview.png
(Size: 238.29KB, Downloaded 163 times)
Attachment: ThreadDump.png
(Size: 110.98KB, Downloaded 187 times)

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Re: OOM error Finalizer [message #1828298 is a reply to message #1828205]

Sat, 06 June 2020 14:16

Andrew Johnson

Messages: 205
Registered: July 2009

Senior Member

I don't think the finalizer thread is stuck.
There is nothing on the finalizer queue.
The 'In processing' java.lang.System$2 object is just a local variable in the initial stack frame java.lang.ref.Finalizer$FinalizerThread.run()V
Try examining more carefully the details of problem suspect 1.

Try using the latest version of MAT - 1.10 or perhaps a snapshot version.

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Re: OOM error Finalizer [message #1828299 is a reply to message #1828298]

Sat, 06 June 2020 14:30

Romit Saha

Messages: 2
Registered: June 2020

Junior Member

In the Unix box it's showing 80 % full memory..but in the MAT overview screen it shows only 300mb heap size where can I see the rest of the memory going in jvm..how to include the unreachable object size

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