Nice tip, thank you oSKAR. This was a problem I was going through too. shadow_hunt3r.
On 30 jul, 10:41, oSKAR <[email protected]> wrote: > Hi David: > > Go to "Computer" then right click choose "properties" select "Advanced .." > select "Environment variables" at bottom > > then click "new" > > in the fields: > > Variable name: CLASSPATH > Variable Value: %CLASSPATH%;C:\Documents and Settings\Dave\My > Documents\MyJava > > Now you are ready to operate > > bye > > oSKAR > > 2009/7/30 DaveB <[email protected]> > > > > > > > All: > > Due to help from BlackRookSix and Pacior, the mystery of CLASSPATH is > > resolved. I hope that this will help others. > > > If there is ANY value in your CLASSPATH variable, you CANNOT use Set > > CLASSPATH=[new directorypath] by itself. > > BlackRookSix suggested using echo %CLASSPATH% to obtain the current > > value. During the installation of the jdk, you probably had to modify > > your CLASSPATH variable, so it will contain some value. The echo > > command will show it to you. > > > To correctly modify this variable, use Set CLASSPATH=%CLASSPATH%;[new > > directorypath] (Note: the ";" is for Windows users). In the example > > I provided earlier, the complete command is Set CLASSPATH=%CLASSPATH > > %;c:\tmp > > > Now do the command echo %CLASSPATH% and the new directory path has > > been appended to the CLASSPATH variable and everything works as > > expected. > > > Also, pacior suggested enclosing in quotes. What I have found is that > > you only need quotes when there is a literal space in the directory > > listing. So for the Windows users, if you were to add something like > > C:\Documents and Settings\Dave\My Documents, you would have to format > > it as C:\"Documents and Settings"\Dave\"My Documents" and everything > > again will work. > > > Thanks to all for pointing in the right direction! > > > DaveB > > > On Jul 29, 6:56 pm, pacior <[email protected]> wrote: > > > "4. I set the CLASSPATH (C:\tmp>set CLASSPATH = c:\tmp) then change > > > to the parent directory which does not contain the class file." > > > It fails, beacuse of white spaces. > > > try: > > > set CLASSPATH="c:\tmp" > > > > Pacior > > > > On Jul 29, 9:39 pm, David Banish <[email protected]> wrote: > > > > > All: > > > > I am in Lesson 3, Packages and Java Classpath. > > > > I thought I got the Classpath, but now I am not so sure. > > > > > In the Command Line Stream below, I have the Hello.class in 2 > > directories(...MyJava and C:\tmp). > > > > 1. The first command (C:\Documents > > > > and Settings\Dave>java Hello) is expected to fail because the class is > > not in the current directory. > > > > 2. I change directories to one that contains the class file and execute > > again (C:\Documents > > > > and Settings\Dave\My Documents\MyJava>java Hello) successfully because > > the class is located in that current directory. > > > > 3. I change directories again to the second directory that contains a > > copy of the class file and successfully execute (C:\tmp>java > > > > Hello) > > > > 4. I set the CLASSPATH (C:\tmp>set > > > > CLASSPATH = c:\tmp) then change to the parent directory which does not > > contain the class file. > > > > 5. At this point, I would expect the class file to execute because of > > the CLASSPATH being set, but it does not > > > > > C:\>java > > > > HelloException in thread "main" > > > > java.lang.NoClassDefFoundError: Hello > > > > 6. I display the classpath which seems correct > > > > > C:\>set > > > > classpath > > > > CLASSPATH=.;C:\Program > > > > Files\Java\jre6\lib\ext\QTJava.zipCLASSPATH > > > > = c:\tmp > > > > 7. But, if I use the -classpath option in the java line, it works as > > expected (C:\>java > > > > -classpath c:\tmp Hello) > > > > > So > > > > can anyone help me as to why the Classpath does not seem to work as > > > > expected? I did notice that my "set Classpath" statement created a > > > > second line with classpath listed twice. Is that it? > > > > > ------ > > > > > C:\Documents > > > > and Settings\Dave>java Hello > > > > Exception in thread "main" > > > > java.lang.NoClassDefFoundError: Hello > > > > Caused by: java.lang.ClassNotFoundException: > > > > Hello > > > > at java.net.URLClassLoader$1.run(URLClassLoader.java:200) > > > > at java.security.AccessController.doPrivileged(Native Method) > > > > at > > > > java.net.URLClassLoader.findClass(URLClassLoader.java:188) > > > > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > > > > at > > sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > > > > at java.lang.ClassLoader.loadClass(ClassLoader.java:252) > > > > at > > java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) > > > > Could not find the main class: Hello. Program will exit. > > > > > C:\Documents and Settings\Dave>cd My > > > > Documents\MyJava > > > > > C:\Documents > > > > and Settings\Dave\My Documents\MyJava>java Hello > > > > Hello world > > > > > C:\Documents and Settings\Dave\My > > > > Documents\MyJava>cd c:\tmp > > > > > C:\tmp>java > > > > Hello > > > > Hello world > > > > > C:\tmp>set > > > > CLASSPATH = c:\tmp > > > > > C:\tmp>cd c:\ > > > > > C:\>java > > > > Hello > > > > Exception in thread "main" > > > > java.lang.NoClassDefFoundError: Hello > > > > Caused by: java.lang.ClassNotFoundException: > > > > Hello > > > > at java.net.URLClassLoader$1.run(URLClassLoader.java:200) > > > > at java.security.AccessController.doPrivileged(Native Method) > > > > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > > > > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > > > > at > > sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > > > > at java.lang.ClassLoader.loadClass(ClassLoader.java:252) > > > > at > > java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) > > > > Could not find the main class: Hello. Program will exit. > > > > > C:\>set > > > > classpath > > > > CLASSPATH=.;C:\Program > > > > Files\Java\jre6\lib\ext\QTJava.zip > > > > CLASSPATH > > > > = c:\tmp > > > > > C:\>java > > > > -classpath c:\tmp Hello > > > > Hello world > > > > > Thx to all, > > > > DaveB --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/javaprogrammingwithpassion?hl=en -~----------~----~----~----~------~----~------~--~---
