Sudden random dashboard exceptions

Description:

You are suddenly getting the following exception when running a dashboard which worked before many times.  Dashboard works again after restarting the OS, then fails again after a little while.

Error Trace:

Exception occurred rendering view org.springframework.web.servlet.view.JstlView: name 'modules/system/errorPage'; URL [/WEB-INF/jsp/modules/system/errorPage.jsp]

java.lang.IllegalStateException: Exception occurred rendering view
 org.springframework.web.servlet.view.JstlView: name 'modules/system/errorPage'; URL [/WEB-INF/jsp/modules/system/errorPage.jsp]
 at org.springframework.webflow.mvc.view.AbstractMvcView.render(AbstractMvcView.java:191)atorg.springframework.webflow.engine.ViewState.render(ViewState.java:296)
 at....

Solution: 

You may be running out of disc space.  Check disk space immediately and run disk cleanup as soon as possible to keep the system running normally at least temporarily until you have time to make major deletion of unused folders.  This particular failure system has only 50G of disc space which is inadequate.  Disc space is inexpensive these days, should be more generous.   Leave a large margin for growth.  Suggested minimum 256G.

The diagnostic report in /public/diagnostic is a very useful tool for checking memory or disc space.  Run it once in a while to make sure that JRS has ample system resources to operate normally.