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Java Forum / First Aid / January 2005packages 101, java.lang.NoClassDefFoundError
This works as expected, compiles and runs fine: C:\java\sources\atreides\hello\> javac HelloWorldSwing.java -g C:\java\classes\atreides\hello\ However, when I add "package atreides.hello;" to the first line of HelloWorldSwing.java I get the following error: C:\java\classes\atreides\hello> java HelloWorldSwing Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldSwing What am I doing wrong to get that, please? thanks, Thufir Hawat You can't add the package statement to the source code, unless you move your class definition into a directory that matches the package statement. So try creating a directory called atreides, and within that a directory called hello, and place the source file and .class file there. Then put the directory containing atreided in your CLASSPATH, then either import atreides.hello.* or run java atreides.hello.HelloWorldSwing > You can't add the package statement to the source code, unless you move > your class definition Does class definition refer to whether a class is public/private/other? > into a directory that matches the package > statement. So try creating a directory called atreides, and within that > a directory called hello, and place the source file and .class file > there. Then put the directory containing atreided in your CLASSPATH, > then either import atreides.hello.* or run java > atreides.hello.HelloWorldSwing ////////////////command line/////////////// C:>javac -classpath C:\java\sources\atreides\hello\ HelloSwing.java error: cannot read: HelloWorldSwing.java ///////////////command line////////////////// My directory's are in order, I believe. I'm reading <http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/javac.html>, but am a bit fuzzy as to the distinction between the classpath, cp and sourcepath switches for javac. Thanks, Thufir Hawat ///////////////command line/////////////////////// C:\java\sources>javac atreides/hello/HelloSwing.java C:\java\sources>java atreides.hello.HelloSwing ///////////////command line/////////////////////// The above works :) How would I do it with the -classpath, or, more importantly, why? thanks, Thufir Hawat When I said import the package, that would be in the case where you create an instance of the class HelloWorldSwing inside another class. In that case, you would make sure that the directory containing atriedes is in your CLASSPATH 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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