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You'll need to read the application's log file to see what the underlying error is, but it is very likely that you will find that it is a fatal error - your database is probably heavily damaged and unusable.
H2 is not a supported database for Atlassian stuff, it's only there for getting started with throwaway development, test or demo systems. If used heavily it will fail catastrophically, without warning.
You may be able to recover from a backup if you've taken one.
Whether you decide to try to recover or not is up to you, but you really should migrate to using a proper database as soon as possible, H2 will fail you if you carry on using it.
when I check the logs under target, I found the problem. Thanks for your advice.
2022-08-11 08:44:02,855 FATAL [localhost-startStop-1] [DefaultBootstrapManager] H2 database upgrade failed
com.atlassian.upgrade.UpgradeException: Failed to download H2 library from https://repo1.maven.org/maven2/com/h2database/h2/1.4.196/h2-1.4.196.jar. Download it manually and copy it into: C:\XXXXX\workspaces\xxxx-plugin\target\bamboo\home\h2temp\h2-1.4.196.jar
...
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
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