I have installed JIRA 5.2 on a test server and loaded the backup file from production 4.1. I have disabled the email notifications as suggested by the documentation. When I log in now, I get this error: "Error loading gadget from rest/gadgets/1.0/g/com.atlassian.jira.gadgets:introduction-gadget/gadgets/introduction-gadget.xml: org.apache.shindig.gadgets.GadgetException: Unable to retrieve gadget xml. HTTP error 500"
Issue was caused by this : 'ORA-01461 can bind a LONG value only for insert into a LONG column' Error Due to Oracle Database Definition. Was able to resolve by "Modify
WEB-INF/classes/entitydefs/fieldtype-oracle10g.xml to define very-long as a CLOB."
As Harry Chan suggested you can't jump directly from 4.4 to 5.1, instead follow the below steps.
1. Setup intermediatory JIRA with 4.4 version.
2. Import prod jira 4.4 data to this new jira4.4.
3. Upgrade JIRA 4.4 to JIRA 5.2.
4. Take export of intermediatory JIRA 5.2.
5. Import it into test jira 5.2.
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