java-native/jssc

i got error in Raspberry pi . Arm64 environment

dhirajthaokar opened this issue · 5 comments

dhirajthaokar commented 
Exception in thread "Thread-9" java.lang.UnsatisfiedLinkError: 'long jssc.SerialNativeInterface.openPort(java.lang.String, boolean)'
	at jssc.SerialNativeInterface.openPort(Native Method)
	at jssc.SerialPort.openPort(SerialPort.java:158)
	at com.intelligt.modbus.jlibmodbus.serial.SerialPortJSSC.open(SerialPortJSSC.java:58)
	at com.intelligt.modbus.jlibmodbus.net.ModbusConnectionSerial.openImpl(ModbusConnectionSerial.java:60)
	at com.intelligt.modbus.jlibmodbus.net.ModbusConnection.open(ModbusConnection.java:45)
	at com.intelligt.modbus.jlibmodbus.slave.RequestHandlerSerial.run(RequestHandlerSerial.java:51)
	at java.base/java.lang.Thread.run(Thread.java:829)

java program

 serialParameters.setDevice("/dev/ttyS4"); 
            serialParameters.setBaudRate(SerialPort.BaudRate.BAUD_RATE_9600);
            serialParameters.setDataBits(8);
            serialParameters.setParity(SerialPort.Parity.NONE); 
            serialParameters.setStopBits(1);

            
            slave = ModbusSlaveFactory.createModbusSlaveRTU(serialParameters);
            slave.setReadTimeout(1000); 
            Modbus.setLogLevel(Modbus.LogLevel.LEVEL_DEBUG);

            MyOwnDataHolder dh = new MyOwnDataHolder();
pietrygamat commented

You may want o upgrade jssc version to the latest released https://github.com/java-native/jssc/releases/tag/v2.9.5 because this stack trace indicates you are using a pretty old release before Arm64 support was added.

dhirajthaokar commented

thanks for replay , can you explain little more. i used maven project . in program i registered lib.

        System.setProperty("jssc.boot.library.path", "/usr/lib/jni/");

and in jni folder libjSSC.so present . so what exactly wrong with this?

pietrygamat commented

If you use maven version, you should add the following dependency:

<dependency>
    <groupId>io.github.java-native</groupId>
    <artifactId>jssc</artifactId>
    <version>2.9.5</version>
</dependency>

This will add to your project a jssc release with latest java AND binaries precompiled for arm64. Normally the binaries are extracted from our jar to folder under $HOME\.jssc and loaded from there, but if you specify jssc.boot.library.path, that means you mean to override the location and have put libraries manually under /usr/lib/jni/. If that's the case - make sure you put the correct .so files there - the older version of jssc (version 2.8 - predating maven packaging) may be put there by any other library you are using, so make sure you have no duplicate dependencies.

Also, double check this:

at jssc.SerialNativeInterface.openPort(Native Method)
at jssc.SerialPort.openPort(SerialPort.java:158)

If your stacktrace looks like this, you are loading old jssc jar (2.9.1 or even older 2.8). You expect openPort call to be in line 210.

tresf commented

jssc.boot.library.path is supported in versions 2.9.3 and higher only, per: 135350e

pietrygamat commented

I don't think there is anything more to add to this one, so I'll close it. @dhirajthaokar feel free to comment or reopen if you feel otherwise.