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com.github.davidmoten.rx.jdbc.exceptions.TransactionAlreadyOpenException: 	at com.github.davidmoten.rx.jdbc.Database.beginTransactionObserve(Database.java:647)	at com.github.davidmoten.rx.jdbc.QueryContext.beginTransactionObserve(QueryContext.java:45)	at com.github.davidmoten.rx.jdbc.QueryUpdateOnSubscribe.performBeginTransaction(QueryUpdateOnSubscribe.java:115)	at com.github.davidmoten.rx.jdbc.QueryUpdateOnSubscribe.call(QueryUpdateOnSubscribe.java:78)