Database migration fails - Unsupported major.minor version
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
Attempting to migrate to SQL Server using a downloaded driver the test connection procedure hangs. The following appears in the atlassian-fisheye-<YYYY>-<MM>-<DD>.log:
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Caused by: java.lang.UnsupportedClassVersionError: net/sourceforge/jtds/jdbc/Driver : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:249)
at com.atlassian.crucible.actions.admin.database.TestDBConnectionAjaxAction.checkDriverClass(TestDBConnectionAjaxAction.java:53)
at com.atlassian.crucible.actions.admin.database.TestDBConnectionAjaxAction.execute(TestDBConnectionAjaxAction.java:27)
... 113 more
Cause
There is a mismatch between the driver and Java version.
Resolution
Make sure the driver is compatible with the installed Java version. See this
.
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