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java.lang.NullPointerException: 	at java.util.regex.Matcher.getTextLength(Matcher.java:1234)	at java.util.regex.Matcher.reset(Matcher.java:308)	at java.util.regex.Matcher.(Matcher.java:228)	at java.util.regex.Pattern.matcher(Pattern.java:1088)	at org.dspace.storage.rdbms.DatabaseManager.findByUnique(DatabaseManager.java:541)	at org.dspace.storage.rdbms.DatabaseManager.find(DatabaseManager.java:505)	at org.dspace.eperson.Group.find(Group.java:683)	at org.dspace.eperson.Group.initDefaultGroupNames(Group.java:1500)	at org.dspace.storage.rdbms.DatabaseRegistryUpdater.afterMigrate(DatabaseRegistryUpdater.java:141)	at org.flywaydb.core.internal.command.DbMigrate$3.doInTransaction(DbMigrate.java:226)	at org.flywaydb.core.internal.util.jdbc.TransactionTemplate.execute(TransactionTemplate.java:72)	at org.flywaydb.core.internal.command.DbMigrate.migrate(DbMigrate.java:223)	at org.flywaydb.core.Flyway$1.execute(Flyway.java:864)	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)	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:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:226)	at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:78)