Message Title

Affects both 5.0 and 5.1 and got significantly worse on 5.1 as the latter now also logs the exception. Here's what the output looks like on 5.0.9:

2016-04-10 12:57:27.929  INFO 44672 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.0.9.Final}
2016-04-10 12:57:27.936  INFO 44672 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2016-04-10 12:57:27.943  INFO 44672 --- [           main] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
2016-04-10 12:57:28.047  INFO 44672 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2016-04-10 12:57:28.484  INFO 44672 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.HSQLDialect
2016-04-10 12:57:29.380  INFO 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : HHH000227: Running hbm2ddl schema export
2016-04-10 12:57:29.383 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : HHH000389: Unsuccessful: alter table customer drop constraint FKglkhkmh2vyn790ijs6hiqqpi
2016-04-10 12:57:29.383 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : user lacks privilege or object not found: PUBLIC.CUSTOMER
2016-04-10 12:57:29.384 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : HHH000389: Unsuccessful: alter table sample_order drop constraint FKggpf7tg5jp8ur37vti5q7p3of
2016-04-10 12:57:29.384 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : user lacks privilege or object not found: PUBLIC.SAMPLE_ORDER
2016-04-10 12:57:29.384 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : HHH000389: Unsuccessful: alter table sample_order_line_item drop constraint FKtn1xndx49rjh2jmdevsmt5mfi
2016-04-10 12:57:29.384 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : user lacks privilege or object not found: PUBLIC.SAMPLE_ORDER_LINE_ITEM
2016-04-10 12:57:29.384 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : HHH000389: Unsuccessful: alter table sample_order_line_item drop constraint FKpi9yqg3mrga5fouo9874vrxqx
2016-04-10 12:57:29.384 ERROR 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : user lacks privilege or object not found: PUBLIC.SAMPLE_ORDER_LINE_ITEM
2016-04-10 12:57:29.392  INFO 44672 --- [           main] org.hibernate.tool.hbm2ddl.SchemaExport  : HHH000230: Schema export complete

This is already quite problematic as it's log output on the error level which might confuse the user as it's not an error really. On 5.1 the output looks like follows:

2016-04-10 12:59:26.329  INFO 44698 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.1.0.Final}
2016-04-10 12:59:26.336  INFO 44698 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2016-04-10 12:59:26.339  INFO 44698 --- [           main] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
2016-04-10 12:59:26.425  INFO 44698 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2016-04-10 12:59:26.696  INFO 44698 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.HSQLDialect
2016-04-10 12:59:27.590  WARN 44698 --- [           main] o.h.t.s.i.ExceptionHandlerLoggedImpl     : GenerationTarget encountered exception accepting command : Unable to execute command [alter table customer drop constraint FKglkhkmh2vyn790ijs6hiqqpi]

org.hibernate.tool.schema.spi.CommandAcceptanceException: Unable to execute command [alter table customer drop constraint FKglkhkmh2vyn790ijs6hiqqpi]
	at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:63) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlString(SchemaDropperImpl.java:370) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlStrings(SchemaDropperImpl.java:355) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.applyConstraintDropping(SchemaDropperImpl.java:327) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.dropFromMetadata(SchemaDropperImpl.java:229) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.performDrop(SchemaDropperImpl.java:153) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:125) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:111) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:137) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:64) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:458) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:465) [hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:881) [hibernate-entitymanager-5.1.0.Final.jar:5.1.0.Final]
	…
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: PUBLIC.CUSTOMER
	at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:51) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
	... 59 common frames omitted
Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: PUBLIC.CUSTOMER
	at org.hsqldb.error.Error.error(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.error.Error.error(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.SchemaManager.getUserTable(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.ParserDDL.compileAlterTable(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.ParserDDL.compileAlter(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.ParserCommand.compilePart(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.ParserCommand.compileStatements(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.Session.executeDirectStatement(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	at org.hsqldb.Session.execute(Unknown Source) ~[hsqldb-2.3.3.jar:2.3.3]
	... 62 common frames omitted

… futher exceptions omitted

2016-04-10 12:59:27.657  INFO 44698 --- [           main] o.h.t.schema.internal.SchemaCreatorImpl  : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@5b275811'

This now looks even more puzzling as the presence of a logged exception indicates a problem even more but the actual log level has been reduced to WARN.