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What does the "-D" parameter means?
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Sara El-Kady
Greenhorn
Joined: Jan 11, 2010
Posts: 14
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Hi all,
This might sound pretty basic but I would like to understand what does the "-D" paramenter mean in the following line?
is there some sort of documentation that has all the other valid paramenters as well?
Thanks,
Sara
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Jeanne Boyarsky
internet detective
Marshal
Joined: May 26, 2003
Posts: 23635
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-D is Java's way of saying "system property." It is to show the argument goes to the VM rather than the main() method of your program.
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Tim Holloway
Saloon Keeper
Joined: Jun 25, 2001
Posts: 12513
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To expand, "D" for "Define", so "-Dname=value" constructs a name/value pair and catalogs the name in the JVM's System Properties collection. This collection is convenient as a quick-and-dirty command-line option facility (since you don't have to parse it yourself), as the place to set environment features of the JVM itself, and as a way to support options to "add-in" systems which the application doesn't need to configure itself. Things like logging options, for example.
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One of the most odious afflictions that Business has inflicted on the modern English language is "pro-active". Most of the time it's simply redundantly used in place of the simple old word "active". And a good deal of the rest of the time it means "You're not overworked enough yet, so go out and find more!"
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subject: What does the "-D" parameter means?
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