APM SAAS UI is showing blank graph for the Java agent. We check the application server and it is running. The agent log file is showing following ERROR messages:
[ERROR] [IntroscopeAgent.Agent] The thread named "Agent ServerConnection" has unexpectedly terminated because of java.lang.OutOfMemoryError Java heap space
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.ws.session. WsSessionInvalidatorWithThreadPool$InvalidationTask.run()V.
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.ws.session. WsSessionInvalidatorWithThreadPool$InvalidationTask.run()V.
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.ws.session. WsSessionInvalidatorWithThreadPool$InvalidationTask.run()V.
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.ws.session. WsSessionInvalidatorWithThreadPool$InvalidationTask.run()V.
[WARN] [IntroscopeAgent.Agent] Heartbeat: Agent, Behavior: Data Poller has been running for excessively long time (291253 ms).
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.io.async.ResultHandler$2.run()V.
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.ws.session. WsSessionInvalidatorWithThreadPool$InvalidationTask.run()V.
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.io.async.Re sultHandler$2.run()V.
[ERROR] [IntroscopeAgent.Agent] A problem occurred while loading the tracers for com.ibm.io.async.ResultHandler$2.run()V.
[INFO] [IntroscopeAgent.Agent] The Agent Transaction Trace limit (introscope.agent.ttClamp) of 50 transactions every interval has been reached. No more transactions traces will be reported for this interval.
[WARN] [IntroscopeAgent.Agent] Enterprise Manager responding too slowly, disconnecting
[INFO] [IntroscopeAgent.Agent] AutoTracingTriggerServiceBean passivated.
Release : 21.3
Component : BOOTSTRAP AGENT
Restart of the WebSphere App Server resolved the issue.