team discussing weblogic patch

Quick Fix Tip: Q3 WebLogic Patch Causing 100% CPU Usage

Have you recently experienced escalating WebLogic CPU usage? Many companies have seen their Java processes increase and get stuck at 100% CPU usage. The issue occurred shortly after installing the Q3-2021 Oracle WebLogic patch for JD Edwards web servers.

The initial symptoms include the consistent increase of RAM as seen in the diagram below.

graph that shows an increase in ram metrics

Once RAM reaches a certain point, garbage collection kicks in which runs nonstop keeping the CPU at 100%.

The cause of this excessive CPU usage is new security features released with the patch set. In the diagram below, two security options are unchecked causing the Server Manager Agent to maintain a constant connection to WebLogic requesting HTML status information.

  • Remote anonymous access via IIOP
  • Remote anonymous RMI access via T3

oracle weblogic server

This configuration causes the Server Manager Agent on the web server to constantly increase the heap size until it gets maxed out. Once at max, garbage collecting kicks in and runs non-stop exhausting all available CPU resources.

The Resolution

The solution is simple. Check the two security options and WebLogic will cease requesting the unnecessary information and will no longer consume all the CPU resources.

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