java.lang.OutOfMemoryError: Java heap space - Java 1.8 application running on Linux server

Asked Nov 18 '21 at 11:46

Active Nov 18 '21 at 11:46

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I have a simple Java 1.8 Web Application, that queries my database and displays the results with some other simple functions (insert/update).

From time to time I get this heap space error but I have no clue how to debug it. I've added some more memory but it does not help.

Are there any tools or commands for linux shell that I could use to monitor what classes/methods consume the most memory?

asked Nov 18 '21 at 11:46

willberthos

2

Use a profiler. Visualvm is a good place to start. – Thorbjørn Ravn Andersen Nov 18 '21 at 11:51
How to make and view a heap dump: https://www.baeldung.com/java-heap-dump-capture – Nov 18 '21 at 11:53
Requests for tool recommendations are off topic. However the answers in the duplink include some leads. More importantly, the answers explain how to debug the problem. – Stephen C Nov 18 '21 at 12:12
@ThorbjørnRavnAndersen I can only acces the linux server with Putty, so I don't know how a visual/graphical tool could work? – willberthos Nov 19 '21 at 09:50
Then hprof is your friend - https://stackoverflow.com/a/40215/53897 – Thorbjørn Ravn Andersen Nov 19 '21 at 09:57
@ThorbjørnRavnAndersen haha I just red that answer and I've gotta say that I lost it already at "Look for SITES BEGIN", absolutely no idea what that means :D – willberthos Nov 19 '21 at 09:59
Isn't there a way of just getting the heap dump file and then investigate it with some graphical tool? – willberthos Nov 19 '21 at 10:05

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