Btukfyl

I'm using a HeaderColumnNameMappingStrategy to map a csv file with a header into a JavaBean. String values parse fine but any "true" or "false" value in csv doesn't map to JavaBean and I get the following exception from the PropertyDescriptor:

java.lang.IllegalArgumentException: argument type mismatch

The code where it occurs is in CsvToBean, line 64:

protected T processLine(MappingStrategy<T> mapper, String line) throws  

 IllegalAccessException, InvocationTargetException, InstantiationException, IntrospectionException {

    T bean = mapper.createBean();

    for(int col = 0; col < line.length; col++) {

        String value = line[col];

        PropertyDescriptor prop = mapper.findDescriptor(col);

        if (null != prop) {

            Object obj = convertValue(value, prop);

            // this is where exception is thrown for a "true" value in csv

            prop.getWriteMethod().invoke(bean, new Object {obj});

        }

    }

    return bean;

}



 protected PropertyEditor getPropertyEditor(PropertyDescriptor desc) throws   

       InstantiationException, IllegalAccessException {

    Class<?> cls = desc.getPropertyEditorClass();

    if (null != cls) return (PropertyEditor) cls.newInstance();

    return getPropertyEditorValue(desc.getPropertyType());

}

I can confirm (via debugger) that the setter method id correctly retrieved at this point.

The problem occurs in desc.getPropertyEditorClass() since it returns null. I assumed primitive types and its wrappers are supported. Are they not?

I've run into this same issue. The cleanest way is probably to override getPropertyEditor like pritam did above and return a custom PropertyEditor for your particular object. The quick and dirty way would be to override convertValue in anonymous class form, like this:

CsvToBean<MyClass> csvToBean = new CsvToBean<MyClass>(){



    @Override

    protected Object convertValue(String value, PropertyDescriptor prop) throws InstantiationException,IllegalAccessException {



        if (prop.getName().equals("myWhatever")) {

            // return an custom object based on the incoming value

            return new MyWhatever((String)value);

        }



        return super.convertValue(value, prop);

    }

};

This is working fine for me with OpenCSV 2.3. Good luck!

I resolved this by extending CsvToBean and adding my own PropertyEditors. Turns out opencsv just supports primitive types and no wrappers.

Pritam's answer is great and this is a sample for dealing with datetime format.
PropertyEditorManager.registerEditor(java.util.Date.class, DateEditor.class);

You should write your own editor class like this:
public class DateEditor extends PropertyEditorSupport{
public static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
@Override
public void setAsText(String text){
setValue(sdf.parse(text));}
}