Consolidate ServerMessages

src/main/java/org/caosdb/server/transaction/Transaction.java

@@ -33,7 +33,6 @@ import org.caosdb.server.database.exceptions.TransactionException;
 import org.caosdb.server.database.misc.TransactionBenchmark;
 import org.caosdb.server.entity.EntityInterface;
 import org.caosdb.server.entity.Message;
-import org.caosdb.server.entity.Message.MessageType;
 import org.caosdb.server.entity.container.TransactionContainer;
 import org.caosdb.server.jobs.Job;
 import org.caosdb.server.jobs.Schedule;
@@ -52,9 +51,6 @@ import org.caosdb.server.utils.Observer;
 public abstract class Transaction<C extends TransactionContainer> extends AbstractObservable
     implements TransactionInterface {
 
-  public static final Message ERROR_INTEGRITY_VIOLATION =
-      new Message(MessageType.Error, 0, "This entity caused an unexpected integrity violation.");
-
   @Override
   public TransactionBenchmark getTransactionBenchmark() {
     return getContainer().getTransactionBenchmark();