Why does compiler gives this exception [closed]

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First off, a few things to note. First, compilers do not give Exceptions, they give compilation errors – what you are experiencing is at runtime, not compile-time. Second, fileIn.exists() != false is equivalent to fileIn.exists(), which is easier to read.

The actual problem you’re receiving is because your condition is false – which implies in your case that the file doesn’t exist. We can’t help more with that unless you post more code, but it’s pretty self-explanatory. See documentation on the checkArgument() method here

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