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Java Forum / General / December 2007Do Java CLI commands work on Windows?
I always do most of my development inside an IDE (Eclipse or NetBeans) but lately I have been experimenting with the "Command Prompt" on WinXP. I am under the impression -which I would obviously like to corroborate- that commands such these don't work at all: C:\> set CLASSPATH=C:\somedir\mylib.jar C:\> java -jar myprogram.jar or C:\> java -classpath C:\somedir\mylib.jar -jar myprogram.jar Should this one work at all? C:\> java -DMain-Class=playground.Salutations -jar helloworld.jar I have had very little success settings things up from the command line, but all my tests run well when I place things (Main-Class and Class-Path) in the Manifest. How is the verbose mode used? Is there any way to obtain essential info such as the Main Class and the classpath? TIA, -Ramon > I always do most of my development inside an IDE (Eclipse or NetBeans) > but lately I have been experimenting with the "Command Prompt" on [quoted text clipped - 3 lines] > C:\> set CLASSPATH=C:\somedir\mylib.jar > C:\> java -jar myprogram.jar CLASSPATH will be ignored here. > or > > C:\> java -classpath C:\somedir\mylib.jar -jar myprogram.jar > > Should this one work at all? No, in the sense that the -classpath option will be ignored. > C:\> java -DMain-Class=playground.Salutations -jar helloworld.jar Main-Class isn't a command-line property. > I have had very little success settings things up from the command > line, but all my tests run well when I place things (Main-Class and > Class-Path) in the Manifest. Which is the documented behavior. > How is the verbose mode used? Is there any way to obtain essential > info such as the Main Class and the classpath? Yes, look at the manifest of the JAR. I don't know how "verbose mode" affects visibility of these parameters. From <http://java.sun.com/javase/6/docs/technotes/tools/windows/java.html> > -jar > Execute a program encapsulated in a JAR file. > The first argument is the name of a JAR file instead of a startup class name. > In order for this option to work, the manifest of the JAR file must contain > a line of the form Main-Class: classname. Note the word "must" here. Continuing: > When you use this option, the JAR file is the source of all user classes, > and other user class path settings are ignored.  SignatureLew > > I always do most of my development inside an IDE (Eclipse or NetBeans) > > but lately I have been experimenting with the "Command Prompt" on [quoted text clipped - 5 lines] > > CLASSPATH will be ignored here. My Linux server is running and ancient, non-Sun version of Java, hence my follow up question: Will the above work under Un*x? -Ramon ps: this is what Wikipedia says: "Setting the path through an environment variable. The Environment variable named CLASSPATH may be alternatively used to set the Classpath. For the above example, we could also use on Windows : set CLASSPATH=D:\myprogram java org.mypackage.HelloWorld" http://en.wikipedia.org/wiki/Classpath > > > I always do most of my development inside an IDE (Eclipse or NetBeans) > > > but lately I have been experimenting with the "Command Prompt" on [quoted text clipped - 24 lines] > > http://en.wikipedia.org/wiki/Classpath Now that I have read the 'man' page (RTFMP!) I guess my question is answered. I guess the designers are so eager to improve the loading time that they don't bother doing much error checking. For instance, the Manifest can be syntactically bad, and the user will not be told... -Ramon > ps: this is what Wikipedia says: > [quoted text clipped - 7 lines] > > http://en.wikipedia.org/wiki/Classpath The critical point is that the use of -jar changes some things. Including CLASSPATH and -classpath. And that is to my best of knowledge exactly the same on Linux/Unix and Windows. Arne > From <http://java.sun.com/javase/6/docs/technotes/tools/windows/java.html> >> -jar >> Execute a program encapsulated in a JAR file. The first argument is [quoted text clipped - 3 lines] > > Note the word "must" here. A jar file created with the e option can use that classname as the entry point and no explicit manifest is required. On the other hand, a jar file can contain multiple classes and one can execute a specific class by specifying the jar file as the classpath and the name of the class one wishes to execute. java -cp TheJar.jar TheClass SignatureKnute Johnson email s/nospam/knute/ Ramon F Herrera wrote on 09.12.2007 23:44: > I always do most of my development inside an IDE (Eclipse or NetBeans) > but lately I have been experimenting with the "Command Prompt" on [quoted text clipped - 9 lines] > > Should this one work at all? No, it should not. Read the manual for the java command. Quote from <http://java.sun.com/javase/6/docs/technotes/tools/windows/java.html>: "When you use this option, the JAR file is the source of all user classes, and other user class path settings are ignored." Thomas On Sun, 9 Dec 2007 14:44:12 -0800 (PST), Ramon F Herrera <ramon@conexus.net> wrote, quoted or indirectly quoted someone who said : >C:\> java -classpath C:\somedir\mylib.jar -jar myprogram.jar I think most of your questions will be answered at http://mindprod.com/jgloss/javaexe.html http://mindprod.com/jgloss/classpath.html http://mindprod.com/jgloss/jar.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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