The OutOfMemoryError message reported by the Java HotSpot VM gives a clear indication as to which memory space is depleting. This article focuses on how these memory issues can be handled and prevented in the production environments. In this article we will try to understand what these OutOfMemoryError error messages mean, which diagnostic data we should collect to diagnose and troubleshoot these issues, and will investigate some tooling to collect that data and analyze it for resolving these memory problems. For a Java process, there are several memory pools or spaces - Java heap, Metaspace, PermGen (in versions prior to Java 8) and native heap.Įach of these memory pools might encounter its own set of memory problems, for example– abnormal memory growth, slowness in the application or memory leaks, all of which can eventually manifest in the form of an OutOfMemoryError for these spaces.
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