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EM agent start fails With 'java.lang.OutOfMemoryError'

I will show how to solve EM Agent failing to startup related to java memory problems.

Suddenly i found my agent is not starting with error Failed. So now its time to find issue and need to fix.

I have checked multiple logfiles but found this error in emagent.nohup, there was an error related to java memory:

It was an "Out of Memory Exception". To solve it, I had to increase the java heap space allocated to emagent.

(Reference Oracle Doc Id- 1399201.1)

Edit '$AGENT_BASE/agent_inst/sysman/config/emd.properties' and increase the memory allocated to 512M.

Before-

cat emd.properties | grep agentJavaDefines

agentJavaDefines=-Xmx128M -XX:MaxPermSize=96M

After-

cat emd.properties | grep agentJavaDefines

agentJavaDefines=-Xmx512M -XX:MaxPermSize=96M

Now Try to restart agent using "emctl start agent".

emctl start agent

Oracle Enterprise Manager Cloud Control 12c Release 5

Starting agent ..................... started.

if you still face any issues, you will need to clear the agent state and retry.

Do the following:

Stop and kill any remaining process related to EM Agent that is still running (perl or java).
Clean all files from '$AGENT_BASE/agent_inst/sysman/emd/state/*' folder (or move them to a temporary place).
Clear agent state by running: emctl clearstate agent.
Increase the memory allocated editing emd.properties, as showed before, if not already done.
Try to start the agent again.