CODEWITHSUNDEEP
javalinuxserial-portvirtual-serial-port
Sastrija
Sastrija

Reputation: 3374

Serial Port accessing code for linux platform

I'm working on a project to communicate to the serial ports using Java. Do I need to have a device connected to serial port to test the following code?

Enumeration ports = CommPortIdentifier.getPortIdentifiers();
while (ports.hasMoreElements()) {
    CommPortIdentifier port = (CommPortIdentifier) ports.nextElement();
    String type;
    switch (port.getPortType()) {
        case CommPortIdentifier.PORT_PARALLEL:
            type = "Parallel";
            break;
        case CommPortIdentifier.PORT_SERIAL:
            type = "Serial";
            break;
        default: /// Shouldn't happen
            type = "Unknown";
            break;
    }
    System.out.println(port.getName() + ": " + type);
}

Any solution to make this code working. Currently I'm getting an error as follows.(without attaching any device to serial port.

Exception in thread "main" java.lang.UnsatisfiedLinkError: com.sun.comm.SunrayInfo.isSessionActive()Z
        at com.sun.comm.SunrayInfo.isSessionActive(Native Method)
        at com.sun.comm.Portmapping.registerCommPorts(Portmapping.java:155)
        at com.sun.comm.Portmapping.refreshPortDatabase(Portmapping.java:100)
        at javax.comm.CommPortIdentifier.<clinit>(CommPortIdentifier.java:138)
        at PortTest.main(PortTest.java:9)
Java Result: 1

I've configured comm with jre. I've followed this blog to do it.

Upvotes: 0

Views: 2966

Answers (2)

Sastrija
Sastrija

Reputation: 3374

After a bit struggles, I got the code running.

One mistake I made was using RxTx 2.2 library for Fedora 13. It uses 2.2 version of libSerial and libParellal files and 2.1 RxTxComm jar file. When I removed it and used RxTx2.1 I got an error like following.

gnu.io.RXTXCommDriver cannot be cast to javax.comm.CommDriver

While checking for this error, I found the second mistake I made and solution for the above problem. I was using RxTx Driver with java Comm API. Actually the required class files in Java Comm API is already available in the RxTx library with in "gnu.io" package.

So I changed all the javax.comm.* packages to gnu.io.*. Now I can run the application without any error.

Upvotes: 0

Brian Roach
Brian Roach

Reputation: 76888

You're missing the native libraries required. The line above the error lines you posted is telling you that.

You need to install the javax.comm extention - http://www.oracle.com/technetwork/java/index-jsp-141752.html

If you're using windows, it's no longer supported or available from Sun/Oracle. You may be able to find an older version on the net or someone else porting it.

Upvotes: 2

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