It is important to check returnvalue of file.mkdirs() since it will #145
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return false when it fails.
If it fails, a NullPointerException will occur on the line with
'for (final File f : parentDir.listFiles()) {'. Kind of difficult to
understand why. This exception should be pretty clear.
We've experienced this using cloudname in our application, because
the user did not have permission to create folders.
stalehd
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Nov 30, 2015
Check return value from File.mkdirs() Throws NPE if the directory can't be created.
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return false when it fails.
If it fails, a NullPointerException will occur on the line with
'for (final File f : parentDir.listFiles()) {'. Kind of difficult to
understand why. This exception should be pretty clear.
We've experienced this using cloudname in our application, because
the user did not have permission to create folders.