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====== Procedures ======
  Defines procedures which can be helpful for troubleshooting problems with the application

===== Find Java install folder =====
  * You will need sometimes to use java tools located in java ''bin'' folder, which is not always in the PATH.
  * To find the exact Java ''bin'' folder, execute the below command

  # ls -l /etc/alternatives/java
  > /etc/alternatives/java -> /usr/lib/jvm/java-17-openjdk-17.0.0.0.35-1.rolling.el7.x86_64/bin/java

===== Find application PID =====
  * Java tools often require to provide process PID
  * It can be discovered by running the below command:

    # systemctl status promonitor

  * The PID is displayed next to the application startup command (22502 in below example)

{{:products:promonitor:6.8:troubleshooting:pasted:20250619-095852.png}}

  * If multiple PIDs are displayed, run it multiple times, the right one is the one which persists and never changes.

===== Heap dump =====
  Heap dump creates a file allowing to inspect memory usage of the application
  This is helpful for investigating problems such as memory leaks

  * Get the application PID and run following command

  [JAVA BIN PATH]/jmap -dump:live,format=b,file=heapdump.hprof [PID]

  * Attach the dump file to a ticket. This will help investigating 

**Note:**
  * If jmaps returns an error such as ''well-known file /tmp/.java_pid22502 is not secure: file should be owned by the current user (which is 0) but is owned by 994''
  * Try running it by prefixing the command with ''sudo -u promonitor'', such as

  sudo -u promonitor [JAVA BIN PATH]/jmap -dump:live,format=b,file=heapdump.hprof [PID]

===== Stack trace =====
  Stack traces helps understanding what the application is doing at a given time.
  This helps investigating performance issues, such as slow startup

  * Get the application PID and run following command

  [JAVA BIN PATH]/jstack PID > stacktrace.log

  * Attach ''stacktrace.log'' to a ticket
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