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java.lang.NullPointerException: 	at org.avaje.dbmigration.MigrationRunner.run(MigrationRunner.java:47)	at com.avaje.ebeaninternal.server.core.DefaultServer.start(DefaultServer.java:350)	at com.avaje.ebeaninternal.server.core.DefaultContainer.createServer(DefaultContainer.java:140)	at com.avaje.ebeaninternal.server.core.DefaultContainer.createServer(DefaultContainer.java:75)	at com.avaje.ebeaninternal.server.core.DefaultContainer.createServer(DefaultContainer.java:42)	at com.avaje.ebean.EbeanServerFactory.create(EbeanServerFactory.java:55)	at com.avaje.ebean.Ebean$ServerManager.getWithCreate(Ebean.java:207)	at com.avaje.ebean.Ebean$ServerManager.(Ebean.java:165)	at com.avaje.ebean.Ebean$ServerManager.(Ebean.java:130)	at com.avaje.ebean.Ebean.(Ebean.java:124)	at com.avaje.ebean.dbmigration.DbMigration.setDefaults(DbMigration.java:462)	at com.avaje.ebean.dbmigration.DbMigration.generateMigration(DbMigration.java:209)	at dbhelpers.MainDbMigration.main(MainDbMigration.java:35)	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)