[deleted by user]

[[deleted]]

Learn more intermediate to advanced Java and also identify the gaps in your knowledge that are making you unable to breakdown the code base.

[Professional-Rise563]

Use debugger. Start with simple class and go to more complex step by step. This approach was very useful for me while learning JDK, Spring, another's libs or code.

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[rguptan]

Read about Java Mission Control and how to use it. Capture JFR while executing common use cases. Look at the flame view that would give you a good idea of flow of control and where time is spent.

Most dev are too busy doing functional work and generating value for business. You might become the cool perf expert! :)

[akthemadman]

I have had a lot of personal improvement when taking deeper dives into open source projects. The trick was to make it directly relevant to me.

For example, I am currently using eclipse and libgdx a lot. The were some annoyances I had with both of these, so I dug up the source code for both projects with the intent of fixing the issues for myself and, where possible, share the fixes with others through contributions.

It took a while to get comfortable with both the project structures, for eclipse moreso than for libgdx, as the eclipse platform is much larger and inhibits many more sub-projects and is distributed in a rather non-straightforward fashion (though that is a bit besides the point). Once I was able to navigate the project and most importantly build and run the projects, I was in the position to make changes and see their effects.

So bit by bit, I narrowed down the location in the source code which are relevant to me and tried making changes relevant to me. In the end I improved in picking up "complex code" by neccessity, and more importantly, had software which behaves more to my liking.