Hi Kamrul,
It really depends on the kind of project and whether you feel more comfortable with Java or Python. Both are excellent frameworks, with a huge community and learning material. I've been working with Spring Boot since I started coding almost and I can assure you it's the perfect combination for Java. The learning curve may be harder that Django, but once you know the basics you're good to go. I can't tell you much about Django but you must now by now that it has a great reputation with Python users. In any case I don't think you can go wrong with any of these two. My advice is, if you are already familiar with the Spring framework, give Spring Boot a try, because you're going to find out that it just makes the whole Spring experience so much easier. Let us know what you chose!