"Device busy" When Reopening Serial Port Post: 302581206

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Operating Systems Solaris "Device busy" When Reopening Serial Port Post 302581206 by Jim Ryan on Tuesday 13th of December 2011 10:09:28 AM

12-13-2011

Registered User

Thanks for the idea. I suppose the GC is a possibility to consider and it's easy with one simple line of code to ask the GC to collect the garbage (though it isn't deterministic whether it will comply with this request in a timely fashion.) But the references between my Java variables and the port objects, when severed, are severed immediately. The references between my app being immediately gone, "Device busy" should not occur. But I'll try your idea and see.

My next test will be similar to the simple test I mentioned above but will use two threads: one to open the port and one to close and reopen it, thus mocking up my actual app's logic. If this test shows it impossible for the second thread to do the reopen because of "Device busy," then it becomes clear that in Solaris, only the thread that opens the port can reopen it while that thread's containing app is running, other threads being disallowed.

---------- Post updated 12-13-11 at 10:09 AM ---------- Previous update was 12-12-11 at 10:50 AM ----------

I am able to generate a similar issue (PortInUseException) when running on Windows with certain unit tests. So, although the issue varies with OS, it is not isolated to Solaris. Moreover, I have been using Java Comm's library for serial ports. But now that I have switched to the RXTX library (which implements the same classes and method, so one only needs to change the namespace in one's code), then the problem goes away in Windows. I do not have an RXTX library for Solaris x86 yet, so I cannot report that result yet. Also, if I do not add an event listener to the serial port in my code (with SerialPort.addEventListener()), then I do not get the issue with either Java Comm or RXTX. Therefore, it seems that SerialPort.removeEventListener() does not work in JavaComm's implementation but does work in RXTX. This fellow found the issue, too: Day after day

I'll need to use a compilation of RXTX for my Solaris x86 machine now.

I do not see this as an OS issue per se, though it does vary in severity between Solaris and Windows. If I find that RXTX resolves the issue in Windows but not in Solaris then I will report that.

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LEARN ABOUT SUNOS

package-appclient

package-appclient(1M)					    Application Server Utility					     package-appclient(1M)

NAME

       package-appclient - packs the application client container libraries and jar files

SYNOPSIS

       package-appclient

       Use  the package-appclient command to pack the application client container libraries and jar files into an appclient.jar file. The created
       file is located at appserver_install_dir/lib/appclient/appclient.jar.  The appclient.jar file  provides	an  application  client  container
       package targeted at remote hosts that do not contain a server installation.

       The  appclient.jar archive contains native code and can be used on a target machine that is of similar architecture as the machine where it
       was produced. So, for example, an appclient.jar produced on a Solaris SPARC platform cannot be used on a Windows client machine.

       After copying the appclient.jar file to a remote location, unjar  it to get a set of libraries and jar files in the appclient directory

       After unjarring on the client machine, modify appclient_install_dir/config/asenv.conf (asenv.bat for Windows) as follows:

	 o  set AS_WEBSERVICES_LIB to appclient_install_dir/lib

	 o  set AS_NSS to appclient_install_dir/lib (appclient_install_dirin for Windows)

	 o  set AS_IMQ_LIB to appclient_install_dir/imq/lib

	 o  set AS_INSTALL to appclient_install_dir

	 o  set AS_JAVA to your JDK 1.4 home directory

	 o  set AS_ACC_CONFIG to appclient_install_dir/config/sun-acc.xml

       Modify appclient_install_dir/config/sun-acc.xml as follows:

	 o  Ensure the DOCTYPE file references appclient_install_dir/lib/dtds

	 o  Ensure that target-server address attribute refrences the server machine.

	 o  Ensure that target-server port attribute refrences the ORB port on the remote machine.

	 o  Ensure that log-service references a log file; if the user wants to put log messages to a log file.

       Modify appclient_install_dir/bin/appclient (appclient.bat for Windows) as follows:

	 o  change token %CONFIG_HOME% to appclient_install_dir/config

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

       appclient(1M)

Sun Java System Application Server				    March 2004						     package-appclient(1M)