• A

    Thanks ! :-D

    I have found the solution.

    It's necessary to add commons logging library.

    Download :

    posted in Modbus4J general discussion read more
  • A

    Hello everybody,

    I want to use Modbus4J rather than Jamod. I use Modbus4J version 3.0.0.

    I'm trying to test the smallest possible example :

    package testModbus;
    import com.serotonin.modbus4j.ModbusFactory;
    import com.serotonin.modbus4j.ModbusMaster;
    import com.serotonin.modbus4j.code.DataType;
    import com.serotonin.modbus4j.ip.IpParameters;
    import com.serotonin.modbus4j.locator.BaseLocator;
    public class Main {
        public static void main(String[] args) throws Exception {
            IpParameters params = new IpParameters();
            ModbusFactory masterF = new ModbusFactory();
            ModbusMaster master = masterF.createTcpMaster(params, false);
            // Define the point locator.
            BaseLocator<Number> loc = BaseLocator.holdingRegister(1, 0, DataType.TWO_BYTE_INT_UNSIGNED);
            // Set the point value
            master.setValue(loc, 1800);
            // Get the point value

    I have this error when I tryto execute the Java program :

    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    	at com.serotonin.modbus4j.ip.tcp.TcpMaster.<init>(TcpMaster.java:57)
    	at com.serotonin.modbus4j.ModbusFactory.createTcpMaster(ModbusFactory.java:69)
    	at testModbus.Main.main(Main.java:18)
    Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
    	at java.net.URLClassLoader.findClass(Unknown Source)
    	at java.lang.ClassLoader.loadClass(Unknown Source)
    	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    	at java.lang.ClassLoader.loadClass(Unknown Source)
    	... 3 more

    With another bigger test, the error is the same.

    I don't know where is the real problem with the code, or configuration, ... ?

    Thanks you in advance for the help :-)
    Aurélien, France

    posted in Modbus4J general discussion read more