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Java Forum / First Aid / March 2008javac classpath; where to compile from?
I would like to compile and execute (run) without changing directories. Currently, however, I get the following error: thufir@arrakis:~/java$ thufir@arrakis:~/java$ javac -cp src -d /home/thufir/java/build/ src/com/ web_tomorrow/CPTest2.java thufir@arrakis:~/java$ thufir@arrakis:~/java$ java build.com.web_tomorrow.CPTest Exception in thread "main" java.lang.NoClassDefFoundError: build/com/ web_tomorrow/CPTest thufir@arrakis:~/java$ thufir@arrakis:~/java$ To get good output, only this seems to work: thufir@arrakis:~/java/src$ thufir@arrakis:~/java/src$ javac -cp . -d /home/thufir/java/build/ com/ web_tomorrow/CPTest2.java thufir@arrakis:~/java/src$ thufir@arrakis:~/java/src$ cd .. thufir@arrakis:~/java$ thufir@arrakis:~/java$ cd build/ thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ java com.web_tomorrow.CPTest2 Run CPTest2.main() thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ how can I do this without changing directories? thanks, Thufir >how can I do this without changing directories? nowadays people do this with ant, not bat files. See http://mindprod.com/jgloss/ant.html If you want to do it the hard way, see http://mindprod.com/jgloss/classpath.html http://mindprod.com/jgloss/javacexe.html  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > nowadays people do this with ant, not bat files. See > http://mindprod.com/jgloss/ant.html What about ruby? or raven? -Thufir >What about ruby? or raven? ant is a specialised tool for doing builds. Ruby is a general purpose language. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > thufir@arrakis:~/java$ java build.com.web_tomorrow.CPTest I think this is the problem here. The package name for your class is not build.com.web_tomorrow . It's just com.web_tomorrow. Try setting the class path to build and executing the class. Maybe: java -cp ./build com.web_tomorrow.CPTest You may have other errors if you are relying on the classpath from the environment. You'll have to add those paths to the command line too if you are using the CLASSPATH variable. > I think this is the problem here. The package name for your class is > not build.com.web_tomorrow . It's just com.web_tomorrow. Try setting > the class path to build and executing the class. Exactly, the package is com.web_tomorrow as per: http://www.kevinboone.com/classpath.html It wouldn't make sense to have a package of build.com.web_tomorrow, or would it? Sounds odd to me, I thought the convention was for packages to begin with com,net,org, etc (where possible). -Thufir > It wouldn't make sense to have a package of build.com.web_tomorrow, or > would it? Sounds odd to me, I thought the convention was for packages to > begin with com,net,org, etc (where possible). Or they begin with java. Or javax. Or anything that doesn't collide with some other package name. ;-) Btw, did you get your java runtime issue working? > Or they begin with java. Or javax. Or anything that doesn't collide > with some other package name. ;-) > > Btw, did you get your java runtime issue working? Yes; it was just a variation of this problem. -Thufir > I would like to compile and execute (run) without changing directories. > Currently, however, I get the following error: [quoted text clipped - 29 lines] > > Thufir You can't classpath your way out of this problem. You must be in a directory that is above the packages you wish to access. You can't point your classpath at source files only .class files and .jars. I've never used ant (I'll have to look into that) but making a simple batch file is very easy. For development I make a compile batch file and a run batch file so I just have to type a couple of keystrokes after I edit my program. SignatureKnute Johnson email s/nospam/linux/ ------->>>>>>http://www.NewsDem > You can't classpath your way out of this problem. You must be in a > directory that is above the packages you wish to access. Thanks, Thufir Thufir wrote: >> I would like to compile and execute (run) without changing >> directories. Currently, however, I get the following error: >> ... >> how can I do this without changing directories? > You can't classpath your way out of this problem. You must be in a > directory that is above the packages you wish to access. Actually, that isn't necessary. > You can't point your classpath at source files only .class files and .jars. However, there is an option to javac to do exactly that: > -sourcepath sourcepath > Specify the source code path to search for class or interface definitions. > As with the user class path, source path entries are separated by colons (:) > and can be directories, JAR archives, or ZIP archives. If packages are used, > the local path name within the directory or archive must reflect the package name. <http://java.sun.com/javase/6/docs/technotes/tools/solaris/javac.html#options> SignatureLew >> -sourcepath sourcepath >> Specify the source code path to search for class or interface [quoted text clipped - 3 lines] >> directory or archive must reflect the package name. > <http://java.sun.com/javase/6/docs/technotes/tools/solaris/javac.html#options> One small point: <http://java.sun.com/javase/6/docs/technotes/tools/windows/javac.html> -sourcepath sourcepath Specify the source code path to search for class or interface definitions. As with the user class path, source path entries are separated by semicolons (;) and can be directories, JAR archives, or ZIP archives. If packages are used, the local path name within the directory or archive must reflect the package name. 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