Java code development without continuous maven build, deploy and tomcat restart n spring application

1. My spring application required maven-build and deploy and tomcat restart for each and every java changes. Is there any tool or way to avoid these processes to speed up my java development?

2. How can we mock a real-time java object that can use and test in the main class?

3. Is there any way to speed up debugging and testing and editing java codes (with some trial and run codes)