public class PersonBean {
    
    private String name;
    private int age;
    
    /** Need to allow bean to be created via reflection */
    public PersonBean() {}
    
    public PersonBean(String name, int age) {
        this.name = name;
        this.age = age;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }	
    
    public int getAge() {
        return age;
    }
    
    public void setAge(int age) {
        this.age = age;
    }
    
    public String toString() {
        return "PersonBean[name='" + name + "',age='" + age + "']";
    }
}

import java.io.StringWriter;

import org.apache.commons.betwixt.io.BeanWriter;

public class WriteExampleApp {

    /** 
     * Create an example bean and then convert it to xml.
     */
    public static final void main(String [] args) throws Exception {
        
        // Start by preparing the writer
        // We'll write to a string 
        StringWriter outputWriter = new StringWriter(); 
        
        // Betwixt just writes out the bean as a fragment
        // So if we want well-formed xml, we need to add the prolog
        outputWriter.write("<?xml version='1.0' ?>");
        
        // Create a BeanWriter which writes to our prepared stream
        BeanWriter beanWriter = new BeanWriter(outputWriter);
        
        // Configure betwixt
        // For more details see java docs or later in the main documentation
        beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false);
        beanWriter.getBindingConfiguration().setMapIDs(false);
        beanWriter.enablePrettyPrint();

        // If the base element is not passed in, Betwixt will guess 
        // But let's write example bean as base element 'person'
        beanWriter.write("person", new PersonBean("John Smith", 21));
        
        // Write to System.out
        // (We could have used the empty constructor for BeanWriter 
        // but this way is more instructive)
        System.out.println(outputWriter.toString());
        
        // Betwixt writes fragments not documents so does not automatically close 
        // writers or streams.
        // This example will do no more writing so close the writer now.
        outputWriter.close();
    }
}

import java.io.StringReader;

import org.apache.commons.betwixt.io.BeanReader;

public class ReadExampleApp {
    
    public static final void main(String args[]) throws Exception{
        
        // First construct the xml which will be read in
        // For this example, read in from a hard coded string
        StringReader xmlReader = new StringReader(
                    "<?xml version='1.0' ?><person><age>25</age><name>James Smith</name></person>");
        
        // Now convert this to a bean using betwixt
        // Create BeanReader
        BeanReader beanReader  = new BeanReader();
        
        // Configure the reader
        // If you're round-tripping, make sure that the configurations are compatible!
        beanReader.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false);
        beanReader.getBindingConfiguration().setMapIDs(false);
        
        // Register beans so that betwixt knows what the xml is to be converted to
        // Since the element mapped to a PersonBean isn't called the same 
        // as Betwixt would have guessed, need to register the path as well
        beanReader.registerBeanClass("person", PersonBean.class);
        
        // Now we parse the xml
        PersonBean person = (PersonBean) beanReader.parse(xmlReader);
        
        // send bean to system out
        System.out.println(person);
    }
    
}