We tried to upgrade our DSpace server to 5.6 but we have found some errors on our dspace log after ant update.
+----------------+----------------------------+---------------------+---------+
| Version | Description | Installed on | State |
+----------------+----------------------------+---------------------+---------+
| 1.1 | Initial DSpace 1.1 databas | | PreInit |
| 1.2 | Upgrade to DSpace 1.2 sche | | PreInit |
| 1.3 | Upgrade to DSpace 1.3 sche | | PreInit |
| 1.3.9 | Drop constraint for DSpace | | PreInit |
| 1.4 | Upgrade to DSpace 1.4 sche | | PreInit |
| 1.5 | Upgrade to DSpace 1.5 sche | | PreInit |
| 1.5.9 | Drop constraint for DSpace | | PreInit |
| 1.6 | Upgrade to DSpace 1.6 sche | | PreInit |
| 1.7 | Upgrade to DSpace 1.7 sche | | PreInit |
| 1.8 | Upgrade to DSpace 1.8 sche | | PreInit |
| 3.0 | Upgrade to DSpace 3.x sche | | PreInit |
| 4.0 | Initializing from DSpace 4 | 2015-10-14 10:15:28 | Success |
| 5.0.2014.08.08 | DS-1945 Helpdesk Request a | 2015-10-14 10:15:29 | Success |
| 5.0.2014.09.25 | DS 1582 Metadata For All O | 2015-10-14 10:15:31 | Success |
| 5.0.2014.09.26 | DS-1582 Metadata For All O | 2015-10-14 10:15:31 | Success |
| 5.6.2016.08.23 | DS-3097 | | Pending |
+----------------+----------------------------+---------------------+---------+
2017-01-24 12:43:31,577 INFO org.dspace.storage.rdbms.DatabaseUtils @ Pending DSpace database schema migrations:
2017-01-24 12:43:31,577 INFO org.dspace.storage.rdbms.DatabaseUtils @ 5.6.2016.08.23 DS-3097 SQL PENDING
2017-01-24 12:43:31,623 INFO org.flywaydb.core.internal.command.DbValidate @ Validated 16 migrations (execution time 00:00.038s)
2017-01-24 12:43:31,626 ERROR org.dspace.storage.rdbms.DatabaseManager @ Failed to initialize the database:
java.sql.SQLException: Flyway migration error occurred
at org.dspace.storage.rdbms.DatabaseUtils.updateDatabase(DatabaseUtils.java:430)
at org.dspace.storage.rdbms.DatabaseUtils.updateDatabase(DatabaseUtils.java:338)
at org.dspace.storage.rdbms.DatabaseManager.initialize(DatabaseManager.java:1373)
at org.dspace.storage.rdbms.DatabaseManager.getDbName(DatabaseManager.java:1491)
at org.dspace.storage.rdbms.DatabaseUtils.main(DatabaseUtils.java:191)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:226)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:78)
Caused by: org.flywaydb.core.api.FlywayException: Validate failed. Found differences between applied migrations and available migrations: Migration Checksum mismatch for migration V5.0_2014.08.08__DS-1945_Helpdesk_Request_a_Copy.sql: DB=-872444192, Classpath=1316176070
at org.flywaydb.core.Flyway.doValidate(Flyway.java:912)
at org.flywaydb.core.Flyway.access$400(Flyway.java:50)
at org.flywaydb.core.Flyway$1.execute(Flyway.java:817)
at org.flywaydb.core.Flyway$1.execute(Flyway.java:811)
at org.flywaydb.core.Flyway.execute(Flyway.java:1171)
at org.flywaydb.core.Flyway.migrate(Flyway.java:811)
at org.dspace.storage.rdbms.DatabaseUtils.updateDatabase(DatabaseUtils.java:419)
... 10 more