Why JIRA couldn't connect to your database ?

[Jagjeett Singh]

Below error is show when I am upgrading jira from 7.8.0 to 9.1

The error I am getting from atlassian-jira.log file.

Caused by: java.lang.IllegalStateException: Unsupported type 17 [1.4.200/3]
at org.h2.mvstore.DataUtils.newIllegalStateException(DataUtils.java:950)
at org.h2.mvstore.type.ObjectDataType.newType(ObjectDataType.java:165)
at org.h2.mvstore.type.ObjectDataType.read(ObjectDataType.java:229)
at org.h2.mvstore.type.ObjectDataType.read(ObjectDataType.java:114)
at org.h2.mvstore.Page.read(Page.java:605)
at org.h2.mvstore.MVStore.readPage(MVStore.java:2211)
... 51 more
2022-08-05 16:10:51,743+0530 JIRA-Bootstrap ERROR [c.a.jira.health.HealthChecks] JIRA couldn't connect to your database
2022-08-05 16:10:51,743+0530 JIRA-Bootstrap ERROR [c.a.jira.health.HealthChecks] JIRA failed to establish a connection to your database.

[Robert Wen_Cprime_]

What's the database (vendor and version) that you have connected to your Jira?  You may need to upgrade the database first before upgrading Jira.

It also seems that you can't connect to your database.