Comm API and Exception in SerialDemo

I was able to compile the SerialDemo source into the application. However, when I run it, it throws an exception at line 560 of SerialDemo$ConfigurationPanel.listPortChoices
This line deals with enumerating the available ports on a system. The exception is a NoClassDefFound (no such class) error. It is looking for javax.comm.CommPortIdentifier
I have installed Comm API 2.0 according to the Win32 directions. I once had a prior installation working - at least listing what ports I actually had on the system - but even then the apps were unable to work with them at all.
Anyone got ideas?

i have this error when run SerialDemo:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/comm/CommPortIdentifier
at SerialDemo$ConfigurationPanel.listPortChoices(SerialDemo.java:560)
at SerialDemo$ConfigurationPanel.<init>(SerialDemo.java:448)
at SerialDemo.<init>(SerialDemo.java:142)
at SerialDemo.main(SerialDemo.java:89)
My CLASSPATH :
C:\j2me\midp2.0fcs\classes;C:\Benhui_Bluecove;
C:\Benhui_Bluecove\classes;
C:\WTK23\apps\BTGalleryExample\src;
C:\Programmi\UCB\jdk1.4.1_02\j2sdk1.4.1_02\jre\lib\comm.jar;
and i have followed the instructions that are at http://www.benhui.net
These are the instructions :
To get mine to work, I copied the 'comm.jar' and 'javax.comm.properties' files into the following locations:
* <J2SE SDK installation directory>\lib
* <J2SE SDK installation directory>\jre\lib
* <J2SE SDK installation directory>\jre\lib\ext
And copied the 'win32com.dll' into the following locations:
* <J2SE SDK installation directory>\bin
* <J2SE SDK installation directory>\jre\bin
Can someone help me?
Thanks
Dani

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HI!
I want to implement a little programe in Java.
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mov al,3
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How could I write to the other 2 addresses?

outport is a function from Borland C++. So you'll have problems using such function.
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You'll also need to use the statement
#pragma intrinsic(_inp,_inpw,_inpd,_outp,_outpw,_outpd)immediately below including #include <conio.h>
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int _outp( unsigned short port, int databyte );
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Comm API Problems

Hi Everyone,
I've just installed the comm API, and installation process seems to have gone quite smoothly, (the code is compilling correctly), but the demo programs will not run, i get the error:
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleWrite
or the same error coming from SimpleRead.
Any ideas on whats going on?
Andrew

You can't use directory names that have a space in
them when using Java.Okay, I've uninstalled the java sdk, installed it to
C:\jdk
copied the win32.dll to the jdk\bin directory
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ive downloaded the comm api and installed it in my system (win 95) Ive followed exactly all the steps that are recommended and even changed by classpath. I still get the followin error message
Excpetion in thread "main" java.lang.NoClassDefFoundError : SimpleRead/java.
Please help.
thanks
G.P.

u were right amolk, i did not include the period and that was the problem. thanks a lot and thank u too DrClap.
G.P.

Comm API problems RS232 SerialDemo

Hello,
before you ask: yes, i have read a lot of postings concerning this topic.
However, my problem is different than the common Comm API problems.
Win2000, JDK 1.5.2, Comm API 2.0.
The SerialDemo compiles (wow), shows the correct COM Ports (1) (this has been a major problem in a lot of postings), and works without exceptions. Great, but i dont get any serialEvent when i send something from my device on COM1 (a balance).
I know the RS232 parameters (1200,7 data bits, 1 stop bit, parity odd), and i connected this device without problems to a Delphi application.
Cable is the same and the correct one. The device sends with CRLF (ASCII 13 and 10) at the end of each string.
I tried SimpleRead.java too, but here the same: no serialEvent has been triggered when the device sends its data.
Any ideas?
Oliver

Hi
sorry, it does work now :)
It was the device itself which was causing the problem.
But i really wasnt expecting this, because the day before the device (a balance) worked without any problems. Its quite funny that the balance stopped working just the day i started with the Java communication :)
thanks
Oliver

Stand Alone OC4J and Java's Comm API

I am using the Java Comm API alongwith a servlet. The code simply gets the required ports and displays it in a JSP page. The program is developed using Jdeveloper 9. It works fine with embedded OC4J but a blank jsp page is displayed when deployed in in standalone OC4j instance on the same machine. I have correctly copied the required wincom32.dll, java.comm.properites and comm.jar to the jre/bin, jre/lib and jre/lib/ext respectively. What could be wrong.
Thanks
MMN

Try setting the OS PATH env variable to the directory where the .DLL is located before you launch the container. Or else put the .DLL in a directory which is in the existing path.
cheers
-steve-

File not found and exception during commit of transaction

Hi All,
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Message:
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If I hit continue while debugging then I get this exception:
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One possible cause of this issue is that your JPD may have some non-transient field(s) which is/are not Serializable. Check for the warnings in the Workshop, that may point you to such fields.
~Balwinder

Comm api errors

Hi
We are developing an application with Point of Sale capabilities. To interact with the printer and cash drawer we use the comm api. The cash drawer is attached to the printer and the printer is attached to the pc via a serial port.
We have tried and succeeded to print and open the cash drawer on a desktop running Win2000 and WinXP, but when we run the same code on a Dell laptop running WinXP the following happens:
Printing:
Garbage as well as the text we pass through is printed and the following is printed to the standard output (not by us):
Unable to GetCommConfig() – 1
CashDrawer:
Cash drawer opens and the following error is caught
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javax.comm.UnsupportedCommOperationException: Win32 Comm Driver: Error 1
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at SerialDemo.main(SerialDemo.java:49)
and the following is printed to the standard output(not by us):
Unable to GetCommConfig() – 1
We are sure we’ve placed the win32comm.dll, javax.comm.properties and comm.jar files in the correct places. Are we missing something obvious? Do laptops handle serial ports differently? Is Dell evil?

Thanks for the advice.
We've checked for conflicts and compared the settings.
There is nothing that we could see that would indicate
a conflict of any sort. But it got us thinking...so we
uninstalled the generic text driver we installed and
the exceptions and error printouts have stopped, but
if we print the string "Hello World\n" the text
"?Hello World" or "Some other garbageHelloWorld" where
Some other garbage has been a small L superscript
thingy or a sc combo character.I am guessing it's a serial printer...
If it is parallel, check the CMOS\BIOS to see if your laptop LPT1 is set to ECP,EPP or Standard ( I think that's what the third one might be called) and verify that it matches the first PC settings...
For a serial printer, on thing to check is the DIP switches... Your laptop ( on a guess that this maybe a different printer than the one used with the first PC) may have the Comm\Serial port set to 9600 8 none 1 Xon\Xoff and the DIP switched on the printer may be 9600 7 even 1 Hardware... For the most part you still communicate between the printer and the laptop, but some stuff gets lost\corrupted...
As for changing the driver, Windows does not delete all the files when removing or replacing drivers for some device especially printers, so if the driver is corrupt, then assuming that it is windows and same version, look in device manager and see what drivers are loaded, uninstall like you had done earlier ( you may need to reboot with the printer disconnected) and manually delete the driver files ( actually just move them to a backup folder\directory in just in case ) then re-install the drivers...
Hope this help you find the solution...
- MaxxDmg...
- ' He who never sleeps... '

How to use the COMM API in a JAR file

I have developed an application, using the NetBeans IDE, to communicate with a modem over the COM1 serial port using the Java Comm API. The application works fine within the IDE, but when a JAR file is created and "double-clicked", the application launches correctly, but when the code is executed to "talk" over the COM1 serial port - nothing happens. No exceptions and no warnings are thrown. My environment is XP, SP1.
The manifest file is as follows:
Manifest-Version: 1.0
Class-Path: ../j2sdk1.4.2/jre/lib/ext/TimerBean.jar ../j2sdk1.4.2/jre/
lib/ext/AbsoluteLayout.jar ../j2sdk1.4.2/jre/lib/ext/comm.jar
Created-By: NetBeans IDE
Specified-By: Projects/TheApp/Files/TheApp.jarContent
Main-Class: Main
According to the Comm API installation instructions, the following files are copied:
copy comm.jar \j2sdk1.4.2\jre\lib\ext
copy wind32com.dll \j2sdk1.4.2\bin
copy javax.comm.properties \j2sdk1.4.2\jre\lib
I suspect it has something to do with the paths.
Any help would be greatly appreciated. Thanks.

Thanks for your input, but after trying what you suggested the problem still exists. I think your right to be suspicous of the javax.comm.properties file. The application, that worked in the IDE, exhibits the same behavoir as the JAR file if the javax.comm.properties file is removed from the ../jre/lib directory. In other words it compiles correctly in the IDE, but when executed, nothing happens when the code that "talks" to the serial port is run.
I've tried moving the javax.comm.properties file into the working directory. Also, the CLASSPATH and PATH system variables were modified to include the path to javax.comm.properties.
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Thanks.

Error in the latest Java comm api for Linux

installed latest Java comm api for Linux, tried test application for the Sun package:
$ java SimpleRead
Exception in thread "main" java.lang.ExceptionInInitializerError
at SimpleRead.main(SimpleRead.java:67)
Caused by: java.lang.NullPointerException
at javax.comm.CommPortIdentifier.findConfFile(CommPortIdentifier.java:199)
at javax.comm.CommPortIdentifier.<clinit>(CommPortIdentifier.java:117)
... 1 more
What deis this message mean? How to make you serial port support work?

and what does this error message mean??
The package was installed accordingly to "Java(tm) Communications API Linux Installation Instructions":
$ls /usr/lib/libLinuxSerialParallel.so
/usr/lib/libLinuxSerialParallel.so
$env|grep CLASS
CLASSPATH=<..skipped..>:/opt/commapi/jar/comm.jar:/opt/commapi/jar/commtest.jar
$ ls /opt/jdk1.5.0_04/jre/lib/javax.comm.properties
/opt/jdk1.5.0_04/jre/lib/javax.comm.properties
What else does it need?

Using Comm API with Web Start

I am trying to use Sun's Comm API with Web Start so I can access COM1 from my application.
When the application starts, I receive an exception for the CommPortIdentifier. When I run this
application as a standalone, it works fine. I have to assume that there is a problem with the
deployment of the Comm API.
I have include the win32com.dll in a jar file and defined it in the nativelib tag in the jnlp file.
The comm.jar and the javax.comm.properties files are include in another jar. I am not sure
what is the proper way to deploy these files and cannot find any documentation on this.
Does anyone know the correct way to handle this?

I have include the win32com.dll in a jar file and
defined it in the nativelib tag in the jnlp file.
The comm.jar and the javax.comm.properties files are
include in another jar. I am not sure
what is the proper way to deploy these files and
cannot find any documentation on this.
should like like this
<resources>
<j2se version="..." href="..."/>
<jar href="application.jar"/>
<jar href="comm.jar" />
</resources>
<resources os="Windows">
<nativelib href="win32com.dll"/>
</resources>
Then in the code in application.jar, call
System.loadLibrary("win32com");
/Dietz

Java comm api in 64-bit Linux

I apologise if this is off-topic. I can't find a suitable forum, I tried posting in the Java plugin forum, but no luck there. I would appreciate any ideas to find a solution.
I am trying to use the java comm api to read and write to the serial port but I am getting the following error:
Error loading LinuxSerialParallel: java.lang.UnsatisfiedLinkError: /usr/lib64/libLinuxSerialParallel.so: Can't load IA 32-bit .so on a AMD 64-bit platform
I am using openSUSE 10.2 (X86-64) which uses Linux 2.6.18.2-34-default x86_64.
I tried Switching to a 32-bit version of java (1.4.2) from within Eclipse and I always run Eclipse in 32-bit java (/usr/share/eclipse/eclipse -vm /usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/bin/java) but I still get this error.
Is there anything I can do to get the java comm api working on a 64-bit system?
Is the java comm api still being developed and maintained? It does not look like it is?
I've done some searching on the web and I find there is an open source version of the java comm api called RXTX but the website at http://www.rxtx.org/ is not very readable. I don't think I know enough to install this on my system.
I would appreciate any ideas to get this working.
Thanks,
Martin

I'm stuck again so I would appreciate some more help.
I've managed to install the Sun 1.6 JDK and configure
and make rxtx.Any small amount of progress is still progress. :)
>
But it still does not work, I get the following error
when I run the SerialDemo:<snip>
>
It seems to be com.sun.comm which is not finding its
native binary not rxtx! No, it's finding the shared library, unless there are a few more lines at the start of your error message that look like this:
Error loading LinuxSerialParallel: java.lang.UnsatisfiedLinkError:
no LinuxSerialParallel in java.library.pathIt's not finding the function it is looking for in that library.
This is what confuses me, the
instructions say install the Solaris version of comm
api (http://www.rxtx.org/ how-to said Solaris Sparc
and the rxtx INSTALL file said Solaris x86 so I tried
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normally these would
call the Solaris binary drivers but I assume this has
to be redirected to rxtx which calls its own
binaries?Yes. There is a part of RXTX called JCL (Java Comm for Linux) that handles that.
http://www.geeksville.com/~kevinh/linuxcomm.html
However, I think the problem is that Sun's API has changed since the RXTX How-To was written. Try downloading the 'comm.jar' at the bottom of the page. It says:
comm.jar, 2.0.3, generic, English (3rd party backward compatibility, only), EnglishUnzip it and copy the comm.jar file to the 'jre/lib/ext' folder of the JDK/JVM where everything else RXTX created was placed.
After doing this the SerialDemo app started for me without errors.
Jim S.

Comm API problems (getPortIdentifier)

Hi! I wrote an applet that uses the javax.comm API to manage a serial port in the host machine. When first develop it with JDK 1.1.8 the applet (and an application) runs perfectly. I now have Java 2 (jdk1.3.1._02) and I'm trying to run this applet and when it arrives to a CommPortIdentifier.getPortIdentifier(String) call, I got this message:
"java.io.lang: name can't be null"
First I thought that was my applet, that my application was wrong, so I try to use de SerialDemo example that comes with the javax.comm and It doesn't work either! If I run it with the latest beta version of JDK (1.4 I think) it runs again... any idea???
Thanks a lot! =)

in jdk1.3...
u have to copy the win32com.dll and comm.properties file in the jre\1.3\bin folder of the machine
and comm.jar in the jre\1.3\lib folder....
remember, in windows, u will get the
...\program files\javasoft\jre\1.3\lib or ..\bin
ther u have to store not in ur c:\jdk1.3\bin
Regards,
Ritesh

CRC with comm api?

Hi,
What I need to do plain and simple is send a CRC encoded msg over the serial port, and idealy be able to show what information is coming in the serial port.
I have been using the serialDemo project that comes with the comm api, because it's pretty simple. However I have a very noisey channel and I need to implement a CRC algorithm for data integrity.. but I don't know how to add this feature to the serialDemo program.
I've been looking at the code but it seems all the control for things like parity etc are right in the comm api, so how can I modify it to use CRC as well?
I'm not new to java but I am new to serial communication.
Please help

The algorithm you are looking for is probably crc16. This is based on a polynomial that uses the data bytes after the parity has been applied.
I found this GNU license on the web.
http://www.jonelo.de/java/jacksum/
Or you can write your own based on this
http://www.summitinstruments.com/library/tn410.htm

COMM Api problems to send a CR (13 or ^M) character.

I am trying to get familiar with the COMM API, I use the examples in the package like "BlackBox", or "SerialDemo".
They work fine, but I realized there is no way to send an "enter" to my router I am trying for testing the COM.
With any other term program on my COM1 I have no problems, both with standard ASCII characters, and with any control character (0-32), thus including "enter" (CR, 13, ^M are equivalents as far as I know).

When trying to send ASCII characters, make sure that you don't send a String, as Java strings are Unicode characters consisting of two bytes. Standard ASCII uses the bottom 7-bits of a byte. The send an Enter or Return chararcter, use the primative type: char
char myEnterChar = '\r';Cheers,
- David

Comm API and Exception in SerialDemo

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