I tried to specify the minimum and maximum weight constraints of a BasicNetwork, but I simply can't find a way to do it. Is it possible to set these constraints?
You could do something like this, the following code clamps the weights to between -10 and +10. You could place this right into the HelloWorldXOR example. The flat.getWeights is just a 1D array of the weights, so you can modify them as you wish.
VectorAlgebra va = new VectorAlgebra();
FlatNetwork flat = network.getFlat();
do {
train.iteration();
va.clampComponents(flat.getWeights(), 5);
System.out.println("Epoch #" + epoch + " Error:" + train.getError());
epoch++;
} while(train.getError() > 0.01);