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Use the relative path when providing the location of the file. Place the file in the project folder and access it according to the hierarchy. If you want to access a file outside the project folder, provide the absolute path.
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java.io.FileNotFoundException: helloworld.jar (The system cannot find the file s pecified)
at java.io.FileInputStream.open(Native Method)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)