Scanning over your error messages indicates the reason of your memory problem

First, your java parameters

-Xms1024m -Xmx1024m

Your java vm will allocate 1GB main memory for the heap, independent  
how much heap memory is needed. The error occurred in the native   
C/C++ code, reading a png image.

The whole java process is consuming to much memory.

1)
Adjust your java parameters to

-Xms128m -Xmx1024m.

As a consequence, java will give back memory to your operating system  
if the memory is not needed.

2)
What is the user/owner of the running java process. Is it root or  
another user ?  Anyway, make a

su - username
ulimit -a

and look for a line like

max memory size         (kbytes, -m) 2617064

3) How much main memory is installed in your servers.

Cheers












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