The Mail Queue is not flushed, and JIRA is no longer sending out email notifications.
The Activity stream or search is not updated with recent content
The following appears in the atlassian-jira.log:
The JVM running JIRA has hit an OutOfMemory Error (OOME). This is thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector. This can cause a number of problems and it's recommended to restart JIRA ASAP if one is thrown, as the Java Virtual Machine (JVM) will likely be in an unstable state.
If you receive an OutOfMemory Error, follow these instructions:
Are you in the right place? This page refers to Heap Space Memory issues, as indicated by the snippet in the Symptoms description. There are a set of other memory related problems such as the following.