Method ignores exceptional return value : FindBugs

问题

Why the heading error in the findbugs for the following code.

 boolean isCreated =  folder.mkdirs();

    if (!isCreated) {
        throw new IOException("Folder already exists..!!!");
    }

回答1:

According to Finds Bug Description.

Method ignores exceptional return value

Method returns a value that is not checked. The return value should be checked since it can indicate an unusual or unexpected function execution.

回答2:

Probably because you're not checking for the SecurityException that mkdirs can throw.

来源：https://stackoverflow.com/questions/23631922/method-ignores-exceptional-return-value-findbugs