java - duplicate class

Question

Confused as to why I get duplicate class error for the following code?

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Answer 1

This can also happen if the package name does not match the folder name, or if the package name is omitted. Check the package statement in your source.

Answer 2

If the file name doesn't match the class name, NetBeans 8.0.1 will report this as a duplicate class.

Answer 3

This also happens if your referencing the erroring class in a separate file in the same package, with the erroring class with an unmatching package path to the file where you are referencing erroring class.

For example file 1 some.incorrect.path.package

class_that_is_erroring{ }

file 2 some.correct.path.package

class new_class{

class_that_is_erroring myclass = null;

}

The package paths in both files must match each other and match the file system directory.

Answer 4

This is a known issue with netbeans BUG 226360

it might help to clear Netbeans cache:

Go to Help -> About and you will see

Cache directory: Path\to\Directory

Close NetBeans, go to specified directory and delete everything.

Answer 5

this might be due to 2 classes with the same name in the same package