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Sinkhole Eclipse Java EE Preview running right project always shows HTTP 404

Source: Internet
Author: User
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Yesterday downloaded a few new demo learning, the results do not know where to change, resulting in the operation of the original project (JSP+SERVLET+JDBC) (This is not a big problem in theory?) So the bottom), the result inexplicably appeared HTTP 404. I got a black line.

Attempt to resolve process: Clean project results are invalid

Delete Item is invalid

Final Solution: Locate the. Metadata folder in the workspace directory and delete it directly! Run, Fix it!

Sinkhole Eclipse Java EE Preview running right project always shows HTTP 404

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