To modify the manifest, you must first prepare a text file containing the information you wish to add to the manifest. You then use the Jar tool's m option to add the information in your file to the manifest.

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Warning :  The text file from which you are creating the manifest must end with a new line or carriage return. The last line will not be parsed properly if it does not end with a new line or carriage return.

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The basic command has this format:

jar cfm jar-file manifest-addition input-file(s)

• The c option indicates that you want to create a JAR file.
• The m option indicates that you want to merge information from an existing file into the manifest file of the JAR file you're creating.
• The f option indicates that you want the output to go to a file (the JAR file you're creating) rather than to standard output.
• manifest-addition is the name (or path and name) of the existing text file whose contents you want to add to the contents of JAR file's manifest.
• jar-file is the name that you want the resulting JAR file to have.
• The input-file(s) argument is a space-separated list of one or more files that you want to be placed in your JAR file.

The m and f options must be in the same order as the corresponding arguments.

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Note : The contents of the manifest must be encoded in UTF8.

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The remaining sections of this lesson demonstrate specific modifications you may want to make to the manifest file.