NoSuchMethodException for java.lang.Class.setValue

[Prashanth Chandra]

Hi,
I am getting the following error when I am trying to excute the below code. I am not able to understand what is causing the below error, I felt its a jar file problem but not able to find the exact jar file.


public static Object invokeMethod(Object p_object,String p_method,Object p_value)
throws Exception {
Method l_method = null;
Object[] l_params = null;
Class[] l_paramTypes = null;
Object l_resultObject = null;
GEALogger.dbg(_moduleName,"invoking method "+p_method+" on "+p_object.getClass().toString());
try {
if(p_value != null){
l_paramTypes = new Class[] { p_value.getClass() };
l_params = new Object[] { p_value };
}
l_method = p_object.getClass().getMethod(p_method,l_paramTypes);
l_resultObject = l_method.invoke(p_object,l_params);
}catch(Exception p_excep){
GEALogger.dbg(_moduleName,"Method "+p_method+" not found in class "+p_object.getClass().getName());
throw p_excep;
}
return l_resultObject;
}

java.lang.NoSuchMethodException: java.lang.Class.setValue(com.sun.org.apache.xerces.internal.jaxp.datatype.XMLGregorianCalendarImpl)
at java.lang.Class.getMethod(Class.java:1581)
at com.ge.industrial.gdsn.messaging.batch.file.xml.req.MethodInvoker.invokeMethod(MethodInvoker.java:32)
at com.ge.industrial.gdsn.messaging.batch.file.xml.req.RequestCreator.addToRequest(RequestCreator.java:166)
at com.ge.industrial.gdsn.messaging.batch.file.xml.req.XMLItemCreator.addElement(XMLItemCreator.java:191)
at com.ge.industrial.gdsn.messaging.batch.file.xml.req.XMLItemCreator.createXMLFile(XMLItemCreator.java:140)
at com.ge.industrial.gdsn.messaging.manager.ItemManager.createItemXMLFile(ItemManager.java:331)
at com.ge.industrial.gdsn.messaging.batch.ItemProducer.produceItems(ItemProducer.java:58)
at com.ge.industrial.gdsn.messaging.batch.ItemProducer.start(ItemProducer.java:40)
at com.ge.industrial.gdsn.messaging.batch.GDSNDataPoolInterface.main(GDSNDataPoolInterface.java:53)



regards
Prashanth

[xsunil kumar]

Is your class is implementing java.lang.reflect.InvocationHandler interface. If yes then below method signature for invoking any method,

public Object invoke(Object proxy, Method m, Object[] args)

Red marked should be array of object not object.

Hope this will be helpful.

Sunil

[Prashanth Chandra]

Hi
My class is using the following class: java.lang.reflect.Method. Its not importing/implementing any other classes.



regards
Prashanth

[Rajneesh K Rajput]

java.lang.NoSuchMethodException: java.lang.Class.setValue(com.sun.org.apache.xerces.internal.jaxp.datatype.XMLGregorianCalendarImpl) almost clarily explaining the problem is with below lines.

 l_resultObject = l_method.invoke(p_object,l_params);	

This could be problem with the dynamic method call, because it does not exists in the jar version which is currently in use.

Please verify at run time, all required prerequisits i.e. class name, method name and parameter list are correct and in order as required.

[Rob Spoor]

The exception says it all:

java.lang.Class.setValue(com.sun.org.apache.xerces.internal.jaxp.datatype.XMLGregorianCalendarImpl)

You are trying to call setValue(com.sun.org.apache.xerces.internal.jaxp.datatype.XMLGregorianCalendarImpl) but the method is probably setValue(java.util.Calendar).

You could try the following:
- list all methods
- if the name is setValue check the parameter types
- if the parameter type allows the argument (use Class.isInstance) take that method and abort

[Prashanth Chandra]

Hi,
I have tried the above options but these does not seem to solve my problem,can someone help me in understading where exactly the issue is/which jar file is creating this issue. I have a lot of jar files in my application because of which I am not able to understand which jar version is going wrong. I have tried with the below jars by downloading the latest one which did not sovle by problem.

xercesImpl.jar
jaxp.jar
xml-apis.jar

regards
Prashanth

[Rob Spoor]

I have told you, you are trying to call the wrong method.

Consider the following example:

public class Test
{
    public void setValue(Object object)
    {
        System.out.println(object);
    }
}

Object o = invokeMethod(new Test(), "setValue", "Hello World");

The invokeMethod method should try to find setValue(Object), but because you are using the actual run time class to look for the method, the invokeMethod method actually tries to find setValue(String). It can't find one so it fails.

Also, my suggestion was not three suggestions but one single suggestion. In pseudo code (only line 15 needs to be filled in):

public static Object invokeMethod(Object p_object,String p_method,Object p_value) throws Exception
{ 
    Method l_method = null; 
    Object[] l_params = null; 
    Class[] l_paramTypes = null; 
    Object l_resultObject = null; 
    GEALogger.dbg(_moduleName,"invoking method "+p_method+" on "+p_object.getClass().toString()); 
    try
    { 
        Method[] methods = p_object.getClass().getMethods();
        for (Method method: methods)
        {
            if (method.getName().equals(p_method))
            {
                if (<p_value is valid as a parameter for method>)
                {
                    l_method = method;
                    break;
                }
            }
        }
        if (l_method != null)
        {
            throw new NoSuchMethodException(p_method);
        }
        l_resultObject = l_method.invoke(p_object,l_params); 
    }
    catch (Exception p_excep)
    { 
        GEALogger.dbg(_moduleName,"Method "+p_method+" not found in class "+p_object.getClass().getName()); 
        throw p_excep; 
    } 
    return l_resultObject; 
}