[SOLVED] Eclipse MAT – Java heap space error

Sometimes, an exception is thrown when you try to parse a large heap dump file.


Unable to open large hprof file, because of the exception shown below.



The heap size of Eclipse Memory Analyser Tool is not enough to parse a heap dump file.


Go to Eclipse MAT home directory and edit MemoryAnalyzer.ini  file. Change  -Xmx  parameter value to appropriate one. There are situations in which it’s necessary to set -Xmx  parameter value above the size of parsed heap dump file. i.e. if you try to open 4GB *.hprof and get Java heap space error, you should try to raise Xmx above 4GB:   -Xmx5g


I hope it was helpful to you. If you have any questions, feel free to ask me in comments below.

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