Package already exists appears when you build packages in eclipse. Note:views might filter empty parent's solution

Some people like to put all the packages in the program after the start of programming, it will inevitably be built in the package when the appearance:

Package already exists. Note:views might filter empty parent.

Such an error prompt. The error is because the package you have built, because it is an empty package (that is, does not contain the class, does not contain the package), so it is not displayed. To display it, you can select "Package Presentation" as "hierarchical" in "Packages Exporer" and you'll see the empty bag you've built. This is because the package is displayed as a tree structure.

It's not hard to find a "." In Eclipse when you build a package. will help you build a folder, where the package is actually the concept of folders, so the first to build a subfolder and then to build the parent folder, of course, will be wrong, because it already exists.