I'm using Postgres 9.2 on Windows with Logback 0.9.18. I am using the DBAppender to log to a database. I am able to log a single logging_event record, but whenever I add something to the MDC which triggers records being written to the logging_event_property table, I get the following error: I can't for the life of me figure out what's going on. thanks! BTW, the JDBC driver is postgresql-9.2-1002.jdbc4.jar 16:33:01,514 |-ERROR in ch.qos.logback.classic.db.DBAppender[db] - problem appending event java.sql.BatchUpdateException: Batch entry 0 INSERT INTO logging_event_property (event_id, mapped_key, mapped_value) VALUES (3, 'dog', 'dog') was aborted. Call getNextException to see the cause. at java.sql.BatchUpdateException: Batch entry 0 INSERT INTO logging_event_property (event_id, mapped_key, mapped_value) VALUES (3, 'dog', 'dog') was aborted. Call getNextException to see the cause. at at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handleError(AbstractJdbc2Statement.java:2746) at at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1887) at at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:405) at at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch(AbstractJdbc2Statement.java:2893) at at ch.qos.logback.classic.db.DBAppender.insertProperties(DBAppender.java:173) at at ch.qos.logback.classic.db.DBAppender.subAppend(DBAppender.java:94) at at ch.qos.logback.core.db.DBAppenderBase.append(DBAppenderBase.java:98) * * *---* *Dawson Mossman* Certified ScrumMaster 454.7061 ext. 226