Two tests in QuoteTest (testQuoteManytoMany, testDoubleQuoteJoinColumn) each create one instance of User which has house3=null. House3 column has a @UniqueConstraint. On some databases, unique (without not-null) constraint allows multiple null values to be in the column, but some databases disallow it (DB2, Sybase, MSSQL..). On these databases, testQuoteManytoMany fails - it violates the constraint, because testDoubleQuoteJoinColumn persisted a User with house3=null.
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