Dynamic properties in Java from xml

I'm fiddling around with an idea but can't get a grip on it.

I have an xml file with 100+ properties defining the runtime environment of a somewhat large program. These are exposed as variables through a class . At the moment, for each option in the xml file, there is a variable in the class plus public getter and private setter.

Each time we need a new option, we have to define it in the xml file and create the variable plus methods in the RuntimenEnvironment class.

Now, what I would like to do is something like this: I want to rewrite the class in such a way, that it exposes new options from the xml file as vars without having to touch the class.

My xml file uses this structure:

<option>
  <name>theName</name>
  <type>eg int</type>
  <value>20</value>
  <constant>THE_NAME</constant>
</option>

Can I write code in java that dynamically creates the vars at runtime and exposes them through a method without actually writing the method?

Is this possible?

Thanks in advance,

Chris