CommPortIdentifier.getPortIdentifiers is empty
Solution 1
Make sure that win32com.dll (comes with javax.com) is in the jre\bin directory. Make sure javax.comm.properties (comes with javax.com) is in the jdk\lib directory.
Solution 2
Remember always you need to add all the unzipped files from javax.comm.zip to jre
win32com.dll - jre/bin
comm.jar - jre/lib/ext
java.comm.properties - jre/lib (after adding this I found resolved exception problem )
Solution 3
This works for me (I installed x86 jdk ) and followed the steps
Your problem is that windows could'nt communicate the right PORT to your JAVA Program.
You have to copy the right files in the right location by following this link.
http://kishor15389.blogspot.com/2011/05/how-to-install-java-communications.html
Saher Ahwal
Software Engineer at Microsoft LinkedIn Profile MEng Thesis: Optimizations to a massively parallel database and support of a shared scan architecture
Updated on June 19, 2022Comments
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Saher Ahwal almost 2 years
I am building a simple application that communicates through Serial Port using the Java Communication API javax.comm.
Here is some code in my java main method I wrote:
CommPortIdentifier cpi = null; Enumeration e = CommPortIdentifier.getPortIdentifiers(); while (e.hasMoreElements()) { try { cpi = (CommPortIdentifier) e.nextElement(); } catch (NoSuchElementException n) { } System.out.println(cpi.getName()); }
Enumeration e is always empty even though I am connected to a COM 4 port when running this.
also, running this code:
portRead = CommPortIdentifier.getPortIdentifier("COM8");
cause the throw of
NoSuchPortException
I think I have done the installation part correctly and placed the properties file, the win32com.dll file in the right places.
Do you know what the problem could be?
Thank You