There are many advantages to hiring a Java developer. Perhaps the most obvious advantage is that Java is a very popular programming language, used by millions of developers around the world. This means that there is a large pool of potential Java developers to choose from when looking to hire someone for your project.
Another advantage of hiring a Java developer is that they will likely have experience with a wide range of Java-based technologies and frameworks. This means that they will be able to hit the ground running on your project, and will be able to quickly adapt to any new technologies or frameworks you may use in the future.
Finally, as Java is an open source language, there are no licensing fees associated with using it. This can save you a significant amount of money over the lifetime of your project.