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Help in analysis [message #1035069]

Sat, 06 April 2013 09:10

ss ss

Messages: 7
Registered: April 2013

Junior Member

Dear All,
I am new to this Memory Analyser tool. I am running a socket based application run the a database pooling and will various select and insert statements in it. Below is my results from the leak hunter.Suspect 2 I guess is due to nature I am pooling so the connection are alive all the time. I cant intepret well the suspect 1 as when I press the details it give a long list of following details.

java.lang.ref.Finalizer @ 0xf5e19670 40 92,688 
next java.lang.ref.Finalizer @ 0xf5e1a6a8 40 93,024 
next java.lang.ref.Finalizer @ 0xf5e1bda0 40 122,768 


Suspect 1.

The class "java.lang.ref.Finalizer", loaded by "<system class loader>", occupies 1,337,176 (30.93%) bytes. The memory is accumulated in one instance of "java.lang.ref.Finalizer" loaded by "<system class loader>".

Keywords
java.lang.ref.Finalizer


Suspect 2
 6 instances of "com.mysql.jdbc.JDBC4Connection", loaded by "sun.misc.Launcher$ExtClassLoader @ 0xf58bf000" occupy 432,624 (10.01%) bytes. 

Biggest instances:

•com.mysql.jdbc.JDBC4Connection @ 0xf61c54f8 - 94,864 (2.19%) bytes. 
•com.mysql.jdbc.JDBC4Connection @ 0xf61c4678 - 86,600 (2.00%) bytes. 
•com.mysql.jdbc.JDBC4Connection @ 0xf61c4bf8 - 85,456 (1.98%) bytes. 
•com.mysql.jdbc.JDBC4Connection @ 0xf626c348 - 68,000 (1.57%) bytes. 
•com.mysql.jdbc.JDBC4Connection @ 0xf626c7d0 - 68,000 (1.57%) bytes. 


Keywords
com.mysql.jdbc.JDBC4Connection
sun.misc.Launcher$ExtClassLoader @ 0xf58bf000

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Re: Help in analysis [message #1059013 is a reply to message #1035069]

Thu, 16 May 2013 08:32

Andrew Johnson

Messages: 205
Registered: July 2009

Senior Member

The Finalizer object just holds details of objects due to be finalized. Run Java Basics > Finalizer Overview to find out more.

Your total heap is only 432,624 / 10.01% = 4221kB, so I don't think you have a memory problem unless you are running your application on really old hardware or a some kind of small scale device rather than a general purpose computer.

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Re: Help in analysis [message #1059024 is a reply to message #1035069]

Thu, 16 May 2013 09:30

ss ss

Messages: 7
Registered: April 2013

Junior Member

Dear Andrew,
I have set my initial and maximum heap as 256Mb on a 8Gb machine. So when do you decide based on the heap size that it is a memory issue or problem. What size of the heap is an indicator of problem? Ok I got it about the finalizer is those where in the final statement rite. How about those link to classloader what is that indicates? What are the other feature of memory analyse can be useful to detect any type of problem?

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