maven… Failed to clean project: Failed to delete ..\org.ow2.util.asm-asm-tree-3.1.jar

Stop your server before you start to clean.

Stopping a server

You can stop the server from the Servers view.

To stop the server:

  1. In the Servers view ( Window > Show View > Other > Server >
    Servers > OK
    ), select the server that you want to stop.
  2. Click the Stop the server this icon
    in the toolbar. In the Servers view, the status of the server
    changes to Stopped.
  3. If for some reason the server fails to stop, you can terminate the
    process as follows:

    a. Switch to the Debug perspective.

    b. In the Process view, select the server process that you want to stop.

    c. Click the Terminate This is an image of the Terminate
    icon in the toolbar.

Note: When terminating a server, the server process will end and the server will not go through the normal routine of stopping, for example calling the destroy() method on a servlet.

Source: Eclipse Help

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