Java Beans, BeanUtils, and the Boolean wrapper class

Question

I\'m using BeanUtils to manipulate Java objects created via JAXB, and I\'ve run into an interesting issue. Sometimes, JAXB will create a Java object like this:

Answer 1

Finally I've found legal confirmation:

8.3.2 Boolean properties

In addition, for boolean properties, we allow a getter method to match the pattern:

public boolean is<PropertyName>();

From JavaBeans specification. Are you sure you haven't came across JAXB-131 bug?

Answer 2

Workaround to handle Boolean isFooBar() case with BeanUtils

1. Create new BeanIntrospector

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private static class BooleanIntrospector implements BeanIntrospector{
    @Override
    public void introspect(IntrospectionContext icontext) throws IntrospectionException {
        for (Method m : icontext.getTargetClass().getMethods()) {
            if (m.getName().startsWith("is") && Boolean.class.equals(m.getReturnType())) {
                String propertyName = getPropertyName(m);
                PropertyDescriptor pd = icontext.getPropertyDescriptor(propertyName);

                if (pd == null)
                    icontext.addPropertyDescriptor(new PropertyDescriptor(propertyName, m, getWriteMethod(icontext.getTargetClass(), propertyName)));
                else if (pd.getReadMethod() == null)
                    pd.setReadMethod(m);

            }
        }
    }

    private String getPropertyName(Method m){
        return WordUtils.uncapitalize(m.getName().substring(2, m.getName().length()));
    }

    private Method getWriteMethod(Class<?> clazz, String propertyName){
        try {
            return clazz.getMethod("get" + WordUtils.capitalize(propertyName));
        } catch (NoSuchMethodException e) {
            return null;
        }
    }
}

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1. Register BooleanIntrospector:

   BeanUtilsBean.getInstance().getPropertyUtils().addBeanIntrospector(new BooleanIntrospector());

Answer 3

you can just create second getter with SET - sufix as workaround :)