When I compiled, I had a lot of Warning messages inside the log. Should I be concerned?
Warning messages are there to let you know that there are things that should be changed inside your code, but will not affect the runnability of the code (the code should still compile even if it has warning messages). Although for a developer team we should be concerned about warnings and try to resolve them as soon as possible, we have accumulated quite a lot of warning messages over time so it will take some time to remove them.
Hence, you shouldn’t be too concerned about the warning messages. Unfortunately, since most of them were there before you made your code changes, it is very hard to see which one came from your changes and which ones were already there.
For the moment, you should only be concerned about errors. Usually, they are red colored and you should know easily that you have errors in your code, because the code would not compile.