code: protected void addFreeConnection(ConnectionHandle connectionHandle) throws SQLException{
  		connectionHandle.setOriginatingPartition(this);
  		// assume success to avoid racing where we insert an item in a queue and having that item immediately
  		// taken and closed off thus decrementing the created connection count.
  		updateCreatedConnections(1);
  		if (!this.disableTracking){
  			trackConnectionFinalizer(connectionHandle); 
  		}
  		
  		// the instant the following line is executed, consumers can start making use of this 
  		// connection.
  		if (!this.freeConnections.offer(connectionHandle)){
  			// we failed. rollback.
  			updateCreatedConnections(-1); // compensate our createdConnection count.
  			
  			if (!this.disableTracking){
  				this.pool.getFinalizableRefs().remove(connectionHandle.getInternalConnection());
  			}
  			// terminate the internal handle.
  			connectionHandle.internalClose();
  		}
  	}
docs: Adds a free connection.
  
  @param connectionHandle
  @throws SQLException on error