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Integrity violation exceptions are being hidden for EXASOL. #1558
I have discovered that when java.sql.Connection#setAutoCommit set to 'false' PK/FK violations ignored. After debugging I noticed that Exasol does these checks on java.sql.Statement#close rather than on java.sql.PreparedStatement#executeUpdate. Checked JdbcUtils class I found that it is ignoring all "on close" exceptions however this specific case should be handled because otherwise transactions management won't work with EXASOL.