title: Duplicate primary key error while inserting data in mysql
body: <p>I'm inserting data in mysql database with JPA, but i get this error!</p>
  
  <pre><code>Query: InsertObjectQuery(eu.telecombretagne.loraFabian.KPI.KPI@7a363633)
  javax.persistence.RollbackException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
  Internal Exception: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for key 'PRIMARY'
  Error Code: 1062
  Call: INSERT INTO ReceivedPacketsStats (id, CodeRate, DataRate, Frequency, Signalisation, Lsnr, NodeMacAddress, MessageID, Modulation, Nature, Rssi, Size, Status, Time, timestamp, TypeMessage) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      bind =&gt; [16 parameters bound]
  Query: InsertObjectQuery(eu.telecombretagne.loraFabian.KPI.KPI@7a363633)
      at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:157)
      at eu.telecombretagne.loraFabian.KPI.KPI.persist(KPI.java:138)
      at eu.telecombretagne.loraFabian.KPI.KPI.&lt;init&gt;(KPI.java:126)
      at eu.telecombretagne.loraFabian.nodeK.PacketFormatConverter.handleStats(PacketFormatConverter.java:275)
      at eu.telecombretagne.loraFabian.nodeK.PacketFormatConverter.NodeKPipePacket2RawData(PacketFormatConverter.java:77)
      at eu.telecombretagne.loraFabian.LoraNodeKConnector.receive(LoraNodeKConnector.java:108)
      at eu.telecombretagne.loraFabian.nodeK.NodeKPipe.receive(NodeKPipe.java:111)
      at eu.telecombretagne.loraFabian.nodeK.tunnel.TunnelPipe.receive(TunnelPipe.java:103)
      at eu.telecombretagne.loraFabian.nodeK.tunnel.UpstreamTunnel.filter(UpstreamTunnel.java:82)
      at eu.telecombretagne.loraFabian.nodeK.tunnel.AbstractTunnel$Filterer.work(AbstractTunnel.java:263)
      at eu.telecombretagne.loraFabian.nodeK.tunnel.AbstractTunnel$Worker.run(AbstractTunnel.java:237)
  Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
  Internal Exception: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for key 'PRIMARY'
  Error Code: 1062
  Call: INSERT INTO ReceivedPacketsStats (id, CodeRate, DataRate, Frequency, Signalisation, Lsnr, NodeMacAddress, MessageID, Modulation, Nature, Rssi, Size, Status, Time, timestamp, TypeMessage) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      bind =&gt; [16 parameters bound]
  Query: InsertObjectQuery(eu.telecombretagne.loraFabian.KPI.KPI@7a363633)
      at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
      at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:900)
      at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:962)
      at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:631)
      at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:558)
      at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2002)
      at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:298)
      at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
      at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
      at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.insertObject(DatasourceCallQueryMechanism.java:377)
      at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:165)
      at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:180)
      at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:489)
      at org.eclipse.persistence.queries.InsertObjectQuery.executeCommit(InsertObjectQuery.java:80)
      at org.eclipse.persistence.queries.InsertObjectQuery.executeCommitWithChangeSet(InsertObjectQuery.java:90)
      at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:301)
      at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
      at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
      at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:798)
      at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
      at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
      at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
      at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
      at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
      at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1737)
      at org.eclipse.persistence.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:226)
      at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:125)
      at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:4207)
      at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1441)
      at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1531)
      at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:277)
      at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1169)
      at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:132)
      ... 10 more
  Caused by: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for key 'PRIMARY'
      at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:931)
      at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
      at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
      at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
      at com.mysql.jdbc.Connection.execSQL(Connection.java:3256)
      at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1313)
      at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1585)
      at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1500)
      at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1485)
      at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:890)
      ... 41 more
  11:03:16.339 [UpstreamTunnel-Filterer-[0]] WARN  eu.telecombretagne.loraFabian.nodeK.tunnel.AbstractTunnel - Exception in UpstreamTunnel-Filterer-[0]
  java.lang.IllegalStateException: 
  Exception Description: No transaction is currently active
      at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.rollback(EntityTransactionImpl.java:176) ~[eclipselink.jar:2.5.2.v20140319-9ad6abd]
      at eu.telecombretagne.loraFabian.KPI.KPI.persist(KPI.java:141) ~[classes/:?]
      at eu.telecombretagne.loraFabian.KPI.KPI.&lt;init&gt;(KPI.java:126) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.PacketFormatConverter.handleStats(PacketFormatConverter.java:275) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.PacketFormatConverter.NodeKPipePacket2RawData(PacketFormatConverter.java:77) ~[classes/:?]
      at eu.telecombretagne.loraFabian.LoraNodeKConnector.receive(LoraNodeKConnector.java:108) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.NodeKPipe.receive(NodeKPipe.java:111) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.tunnel.TunnelPipe.receive(TunnelPipe.java:103) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.tunnel.UpstreamTunnel.filter(UpstreamTunnel.java:82) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.tunnel.AbstractTunnel$Filterer.work(AbstractTunnel.java:263) ~[classes/:?]
      at eu.telecombretagne.loraFabian.nodeK.tunnel.AbstractTunnel$Worker.run(AbstractTunnel.java:237) [classes/:?]
  </code></pre>
  
  <p>Help me to solve that, thank you!</p>