Decomplie Executable Jar File

Hi Thanks for reviewing my project. Project is to decomplie executable Jar file so I can retrieve the source files/code. Background to project: I've spent several months developing java based desktop software and in that time, I've had to hire three different programmers due to skills issue. The last programmer refused to upload the updated source code despite the fact that he signed statement of works and NDA with copyright clause and clause to upload the final source code. I've had to instruct my lawyers to remind him that he signed NDA and copyright agreement and that if he breaks copyright terms he will be sued. Instead of going back to square one, I want to engage programer to decompile the executable Jar file so I can make final changes to complete the software. Note: I've search the internet on how to decompile executable Jar File but I don't have time to carry out the task, even though it appears to be relatively simple. My max budget is $100.00. I only hire experienced / skilled programmers because you tend to get what you pay for. If you cannot deliver on this project, please, please, please,..... don't bid and waste our valuable time. Thanks again for reviewing my project.