Nested exception is java.lang.NoClassDefFoundError in javax.comm with Srping MVC while deploying WAR?

Question

Am trying to read COM port through javax.comm (WINDOWS 32) which implemented in Spirng MVC. Yes I got worked at development, if I deploy the WAR on Tomcat that throws error.

My Error Log:

    org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener]
 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'appConfig': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: void org.springframework.transaction.annotation.AbstractTransactionManagementConfiguration.setConfigurers(java.util.Collection); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [com.gvveg.sales.SalesController] for bean with name 'salesController' defined in file [C:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\gvveg\WEB-INF\classes\com\gvveg\sales\SalesController.class]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: javax/comm/SerialPortEventListener
Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [com.gvveg.sales.SalesController] for bean with name 'salesController' defined in file [C:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\gvveg\WEB-INF\classes\com\gvveg\sales\SalesController.class]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: javax/comm/SerialPortEventListener
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: void org.springframework.transaction.annotation.AbstractTransactionManagementConfiguration.setConfigurers(java.util.Collection); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [com.gvveg.sales.SalesController] for bean with name 'salesController' defined in file [C:\Program Files\Apache Software Foundation\Tomcat 9.0\webapps\gvveg\WEB-INF\classes\com\gvveg\sales\SalesController.class]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: javax/comm/SerialPortEventListener

This is my RequestMapping

@RequestMapping(value = "refreshWeight", method = RequestMethod.GET)
    public ResponseEntity<String> refreshWeight(){
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                 if (portId.getName().equals("COM7")) {
                     SimpleRead();
                }
            }
        }

        return new ResponseEntity<String> ( WEIGHT.trim(), HttpStatus.OK);
    }

This is my Simple Read method:

public void SimpleRead() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {System.out.println(e);}
        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {System.out.println(e);}
    try {
            serialPort.addEventListener(this);
    } catch (TooManyListenersException e) {System.out.println(e);}
        serialPort.notifyOnDataAvailable(true);
        try {
            serialPort.setSerialPortParams(9600,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {System.out.println(e);}
        serialPort.close();
    }

Finally, seralEvent method

public void serialEvent(SerialPortEvent event) {
    switch(event.getEventType()) {
    case SerialPortEvent.BI:
    case SerialPortEvent.OE:
    case SerialPortEvent.FE:
    case SerialPortEvent.PE:
    case SerialPortEvent.CD:
    case SerialPortEvent.CTS:
    case SerialPortEvent.DSR:
    case SerialPortEvent.RI:
    case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
        break;
    case SerialPortEvent.DATA_AVAILABLE:
        byte[] readBuffer = new byte[20];

        try {
            while (inputStream.available() > 0) {
                int numBytes = inputStream.read(readBuffer);
            }
            System.out.println(new String(readBuffer));
            WEIGHT = new String(readBuffer);
        } catch (IOException e) {System.out.println(e);}
        break;
    }   
}

Where does it work "in development"? Is that also a Tomcat instance? Or something else? — dbreaux, Jul 03 '18 at 16:10

score -1 · Answer 1 · answered Jul 03 '18 at 15:02

-1

java.lang.NoClassDefFoundError: javax/comm/SerialPortEventListener

https://docs.oracle.com/javase/7/docs/api/java/lang/NoClassDefFoundError.html

The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.

Your Tomcat environment or WAR file are missing that class.

answered Jul 03 '18 at 15:02

dbreaux

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Yes you are right. But it throwing error on builtin class of SerialPortEventListener. From log : "java.lang.NoClassDefFoundError: javax/comm/SerialPortEventListener" – Sankar Jul 03 '18 at 15:55
Either it's not built-in (without some setting you have to enable), or it's in a classloader that the application can't see. I have no idea how Tomcat does such things. I'll add that tag to the question. – dbreaux Jul 03 '18 at 16:09

Nested exception is java.lang.NoClassDefFoundError in javax.comm with Srping MVC while deploying WAR?

1 Answers1