FAQ-0733 Why do I keep getting a PortInUseException when I try to use javax.comm?


FAQ-0733 Why do I keep getting a PortInUseException when I try to use javax.comm?

» Symbian OS » Developer Knowledgebase » FAQ-0733

Classification:	Java	Category:	JavaPhone
Created:	09/06/2001	Modified:	04/10/2002
Number:	FAQ-0733
Platform:	Symbian OS v6.0

Question:
I am running the SerialChat Java example application on a Nokia 9200 Communicator series SDK for Java. But every time I try to initialise an RS232 port or Ir port I get a PortInUseException. What is wrong here?

Answer:
The reasons for this are different for the two different kinds of port.
In the case of the Ir port, the problem stems from a defect in the javax.comm JavaPhone package which shipped with the Nokia 9210 and corresponding SDK, whereby the wrong name for the Ir port ("IrComm" rather than the correct "IRCOM1") was hard-coded into the com.symbian.javax.comm.EpocCommDriver class in JavaPhone.jar. The solution is to patch this class with an updated version. Unzip the attached zip and copy EpocCommDriver.class into the \erj\classes folder on the SDK or \System\Java\classes folder on the Nokia 9200 communicator. You should find you are then able to initialise the Ir port successfully from the SerialChat application.

In the case of the RS232 port, this is a device-specific issue with the Nokia 9200 Communicator series which is outside Symbian's control.