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java.lang.NullPointerException: 	at com.healthmarketscience.sqlbuilder.dbspec.basic.DbForeignKeyConstraint.(DbForeignKeyConstraint.java:42)	at com.healthmarketscience.sqlbuilder.dbspec.basic.DbSpec.createColumnForeignKeyConstraint(DbSpec.java:279)	at com.healthmarketscience.sqlbuilder.dbspec.basic.DbColumn.references(DbColumn.java:239)	at foo.bar.DbTest.(DbTest.java:49)	at foo.bar.DbTest.main(DbTest.java:73)