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java.lang.OutOfMemoryError

java.lang.OutOfMemoryError

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Bernd_Gruetzke
New Contributor III

‎07-30-2019 08:59 AM

Hello,

I get the ERROR "java.lang.OutOfMemoryError" and I found only the description from 2015, is it valid again.
Because my nsserver.cfg is like this:

-Xms12g -Xmx18g -XX:MetaspaceSize=128m -Djava.awt.headless=true -XX:HeapDumpPath=../../nsdump.hprof -XX:+HeapDumpOnOutOfMemoryError

Regards
Bernd
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jefryarch
New Contributor

‎01-06-2021 07:22 AM

Usually, this error is thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.

Therefore you pretty much have two options:

  • Increase the default memory your program is allowed to use using the -Xmx option (for instance for 1024 MB: -Xmx1024m)
  • Modify your program so that it needs less memory, using less big data structures and getting rid of objects that are not any more used at some point in your program

Increasing the heap size is a bad solution, 100% temporary. It will crash again in somewhere else. To avoid these issues, write high performance code.

  • Use local variables wherever possible.
  • Make sure you select the correct object (EX: Selection between String, StringBuffer and StringBuilder)
  • Use a good code system for your program(EX: Using static variables VS non static variables)
  • Other stuff which could work on your code.
  • Try to move with Multy Threading

 

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jefryarch
New Contributor

‎01-06-2021 07:22 AM

Usually, this error is thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.

Therefore you pretty much have two options:

  • Increase the default memory your program is allowed to use using the -Xmx option (for instance for 1024 MB: -Xmx1024m)
  • Modify your program so that it needs less memory, using less big data structures and getting rid of objects that are not any more used at some point in your program

Increasing the heap size is a bad solution, 100% temporary. It will crash again in somewhere else. To avoid these issues, write high performance code.

  • Use local variables wherever possible.
  • Make sure you select the correct object (EX: Selection between String, StringBuffer and StringBuilder)
  • Use a good code system for your program(EX: Using static variables VS non static variables)
  • Other stuff which could work on your code.
  • Try to move with Multy Threading

 

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Ryan_Yacobucci
Extreme Employee

‎07-30-2019 12:26 PM

Hello,

Make sure that your memory settings following the guidelines defined here if running 8.x:

https://gtacknowledge.extremenetworks.com/articles/Solution/EMC-memory-settings

Thanks
-Ryan
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Bernd_Gruetzke
New Contributor III

‎07-30-2019 09:58 AM

Hi Dilraj

thanks for your prompt replay, I will change my configuration and check the logfile.

Bernd
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Dilraj_Singh_Kh
Extreme Employee

‎07-30-2019 09:05 AM

Hi,

Check below KBs:

https://gtacknowledge.extremenetworks.com/articles/Solution/NetSight-Server-process-crash-with-java-lang-OutOfMemoryError

https://gtacknowledge.extremenetworks.com/articles/Solution/NetSight-server-crashing-with-java-lang-OutOfMemoryError-PermGen-space

https://gtacknowledge.extremenetworks.com/articles/Solution/The-NetSight-Server-is-running-low-on-heap-memory-90-used

DILRAJ
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