Is there a way to find if a Field is boolean the same as isPrimitive()?

I believe Boolean.class.isAssignableFrom(fld.getClass()) can be used to determine if the field is a boolean. I haven't had a chance to test whether this works for primitives though.

Try this (reference):

public boolean getBoolean(Object obj)
               throws IllegalArgumentException,
                      IllegalAccessException

Gets the value of a static or instance boolean field.

Parameters:
    obj - the object to extract the boolean value from 
Returns:
    the value of the boolean field 
Throws:
    IllegalAccessException - if the underlying field is inaccessible. 
    IllegalArgumentException - if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), **or if the field value cannot be converted to the type boolean** by a widening conversion. 
    NullPointerException - if the specified object is null and the field is an instance field. 
    ExceptionInInitializerError - if the initialization provoked by this method fails.

if(fld.getType().equals(boolean.class))

Just tested this and it works for primitive boolean variables.