HMIPServer not starting anymore

[jens-maus]

Describe the issue you are experiencing

Since Version 3.71.12.20231014 monit seems to constantly trying to restart HMIPServer because it crashes with Exceptions during startup.

Here are some log output snippets point at problems with the Java environment:

2023-10-15 13:45:24,095 de.eq3.cbcs.util.EQ3LoggerOutputStream ERROR [Thread-1] Exception in thread "Thread-1" java.lang.IllegalAccessError: class org.rrd4j.core.RrdNioBackend (in unnamed module @0x27d415d9) cannot access class sun.nio.ch.DirectBuffer (in module java.base) because module java.base does not export sun.nio.ch to unnamed module @0x27d415d9 

2023-10-16 09:31:55,103 de.eq3.cbcs.util.EQ3LoggerOutputStream ERROR [Thread-1] Exception in thread "Thread-1" java.lang.NoSuchMethodError: 'sun.misc.Cleaner sun.nio.ch.DirectBuffer.cleaner()' 

After some short investigation it seems that the first Exception cannot access class sun.nio.ch.DirectBuffer can be worked around via addition of --add-opens java.base/sun.nio.ch=ALL-UNNAMED (cf. c618a97). However, the second issue seems to point at an incompatibility of the HMIPServer sources with Java version newer than version 8 (see https://stackoverflow.com/questions/73104986/chronicle-with-corretto-jdk17-java-lang-nosuchmethoderror-sun-misc-cleaner-sun, apache/spark#22993)

Describe the behavior you expected

HMIPServer should start normally.

Steps to reproduce the issue

1. Make sure your CCU is using the embedded diagram functionality
2. Try to update to 3.71.12.20231014
3. Note, that the startup takes a very long time and that HMIPServer alarm messages appear suggesting that HMIPServer isn't starting properly
4. Take a look into /var/log/hmipserver.log and have a look for the mentioned Java exceptions.

What is the version this bug report is based on?

3.71.12.20231014

Which base platform are you running?

ova (Open Virtual Infrastructure)

Which HomeMatic/homematicIP radio module are you using?

n/a

Anything in the logs that might be useful for us?

n/a

Additional information

Issue has been first reported here:
https://homematic-forum.de/forum/viewtopic.php?f=65&t=80179&start=40#p780734
https://homematic-forum.de/forum/viewtopic.php?f=65&t=80179&p=780760#p780759