Every Java developer should follow coding standards and best practices to develop secure Java code. It is critical your code is not vulnerable to exploits or malicious attacks.
One of the reasons we love Java is for its modules system and access modifiers. Taking advantage of these features is a great first step to more robust and secure Java code.
As with any program you write, the more code you have, the more potential that vulnerabilities will occur. So keep the Code Simple.
Using proven libraries and open source will help reduce the security risks in your software and keep your Java codebase in line with security best practices.
To secure your Java applications, filter both exception messages and exception types.