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There are many tutorials among the web for fixing those kind of problems that you can use. Just make sure you do is as quick as possible in order to maintain your code safe. If it's getting a but...

Those kind of errors are sometimes can be hard to handle so it's important for you to try and detect them as quick as possible.
If it's getting too hard for you, you can try using some programs,...

Those kind of errors occur a lot and it;s important to learn how to deal with them. There are many guides on the web you can use. I you want you can try using some programs, like checkmarx and others...

The best way to avoid exceptions is to program in a manner which you detect them right before they come. Try to think about every possible situation and consider it. There are ways you can detect...

As a new to java I recommend learning from the, you can find a lot of important information about how to code better and without errors.
Java can get a bit complicated sometimes as it has to be...

I can't seem to find any mistake in the code but as you say there is one i tend to ask you for more information about what really happens. There are tools which help detecting errors within the code,...