Re: [jnc-users] RXTXcomm and JNC

[Marco T. <ma...@mt...>]

Dear Mario

Mario De Weerd wrote:
> Hi
> 
> I've almost built my opensource app 'BT747' using JNC after getting rid 
> of some unsupported method calls like String.format and 
> BufferedImage.getTransparency.
> I am now at the final 'link'.  I've used Proguard to get rid of most of 
> the rest.
> 
> I get this kind of messages (I build using ant, so I use the 
> autocompiler, resulting in the '[exec prefixes]):
>      [exec]    
> C:/xxx/workspace/BT747/lib/RXTXcomm-win.jar.o:RXTXcomm.jar:(.text+0xdf2): 
> undefined reference to `java::lang::String* 
> gnu::io::CommPortIdentifier::native_psmisc_report_owner(java::lang::String*)'
>      [exec]     
> C:/xx/workspace/BT747/lib/RXTXcomm-win.jar.o:RXTXcomm.jar:(.text+0x26d4): 
> undefined reference to `void gnu::io::I2C::eventLoop()'
>      [exec]     
> C:/xxx/workspace/BT747/lib/RXTXcomm-win.jar.o:RXTXcomm.jar:(.text+0x2bee): 
> undefined reference to `int gnu::io::I2C::open(java::lang::String*)'
>      [exec]     
> C:/xxx/workspace/BT747/lib/RXTXcomm-win.jar.o:RXTXcomm.jar:(.text+0x2c52): 
> undefined reference to `void gnu::io::I2C::nativeSetI2CPortParams(int, 
> int, int, int)'

So, are these native methods from classes in your jar?

> I've set the  java.library.path as this information line shows:
>      [exec]         
> -Djava.library.path=lib;C:\xxx\workspace\BT747\lib\rxtx-2.1-7-bins-r2\Windows\i368-mingw32

There's no need for a classpath for the compilation. It might even 
interfere with the proper compilation if something wrong is picked up. 
Please try without it.

> I've tried both JNI and CNI.

Maybe you first tried CNI and the compiled jar was cached. Then you 
changed to JNI (what would be correct) but the compiled jar with CNI was 
reused?
This is of course just a guess. But if the undefined references are 
coming from your code, then this sounds plausible.


Hope that helps
Marco


> Regarding the first link error, this is defined int he code as:
>     private native String native_psmisc_report_owner(String PortName);
> 
> 
> I'll look further and I'll probably find it, but if somebody has the 
> anwser, it will surely save some time.
> 
> Kind regads
> 
> Mario
> 
> 
> 
> 
> 
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