Don't forget that around this time of year, many people are away, perhaps visiting families, or otherwise busy. They may have extra work to resolve before a deadline approaches at years end. People have lives too. That reduces the number of people who may be willing and able to answer your questions.
If your questions are fairly specific or require knowledge that is not directly about MATLAB as much as JAVA, then this also reduces the set of people who are reading a MATLAB group and also have the knowledge you need.