The other day, I went to a customer who was experiencing a problem that happens quite frequently: he had a cache that was constantly growing, leading to OutOfMemory Exceptions. Other problems in the application seemed linked to it. Analyzing and finding the root cause of this memory related problem triggered me to write this blog on why they ran into OutOfMemory Exceptions despite having a properly configured cache.

He was trying to cache the results of database selects, so he wouldn’t have to execute them multiple times. This is generally a good idea, but most Java developers don’t really know how to do this right and forget about the growing size of their caches.

 

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