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Hello.
It should be possible to check the EC2 system log by following the steps in the document below.
Check this log and if you see an OOM error, there is a high possibility that there is insufficient memory, so please try increasing the instance size.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-console.html#instance-console-console-output
We also recommend checking the EC2 metrics to see if there are any unnatural parts.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/viewing_metrics_with_cloudwatch.html
At the and of the day we reinstalled instance with Amazon Linux (before Linux Red hut was installed on our server). We also tried to use containers with Docker - but it did not help - Java jar file was freezing. Now jar file is up and running without any problems directly without containers. We installed also Java 21 instead of Java 17