AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Newbie Squared - Can't Run At All          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message jay1000 Guest Posted: Fri Jan 02, 2004 12:24 am    Post subject: Newbie Squared - Can't Run At All I decided to learn Java so I borrowed SAMS Teach Yourself Java 2 from the library and downloaded j2sdk-1_4_02_03-windows-i586-p.exe from Sun. It seemed to install OK (in Windows XP Home). Changed the PATH to: PATH %SystemRoot%system32;%SystemRoot%;%SystemRoot%System32Wbem;C:Program FilesCommon FilesAdaptec SharedSystem;C:Program FilesCommon FilesUlead SystemsMPEG;C:Program FilesSupport Tools;C:j2sdk1.4.2_03bin Then I used javac to compile a couple of the SAMS source codes. They compiled without any error messages. But, when I tried to run them using java I got the error message for the first SAMS program ellsworth: Exception in thread "main" java.lang.NoClassDefFoundError: ellsworth Then I changed the CLASSPATH to: CLASSPATH "iQTJava.zip";c:j2sdk1.4.2_03lib It didn't do any good. Similar error message with ellsworth and a couple of other SAMS programs. It's obviously looking for something and not finding it. I can't seem to even get off the ground with Java. Any suggestions? Back to top KC Wong Guest Posted: Fri Jan 02, 2004 1:57 am    Post subject: Re: Newbie Squared - Can't Run At All Quote: I decided to learn Java so I borrowed SAMS Teach Yourself Java 2 from the library and downloaded j2sdk-1_4_02_03-windows-i586-p.exe from Sun. It seemed to install OK (in Windows XP Home). Changed the PATH to: PATH %SystemRoot%system32;%SystemRoot%;%SystemRoot%System32Wbem;C:Program FilesCommon FilesAdaptec SharedSystem;C:Program FilesCommon FilesUlead SystemsMPEG;C:Program FilesSupport Tools;C:j2sdk1.4.2_03bin Then I used javac to compile a couple of the SAMS source codes. They compiled without any error messages. But, when I tried to run them using java I got the error message for the first SAMS program ellsworth: Exception in thread "main" java.lang.NoClassDefFoundError: ellsworth Then I changed the CLASSPATH to: CLASSPATH "iQTJava.zip";c:j2sdk1.4.2_03lib It didn't do any good. Similar error message with ellsworth and a couple of other SAMS programs. It's obviously looking for something and not finding it. I can't seem to even get off the ground with Java. Any suggestions? The error message means Java VM cannot find your class "ellsworth". You should follow EXACTLY what your book said - follow the directory structure and names (they're case-sensitive). It's most likely a classpath problem, which you don't have enough knowledge about at the moment. Follow what the book said - you'll figure it out later (the book will teach you). Back to top Andrew Thompson Guest Posted: Fri Jan 02, 2004 7:13 am    Post subject: Re: Newbie Squared - Can't Run At All "jay1000" <jfschonREMoVE (AT) yahoo (DOT) com> wrote Quote: Exception in thread "main" java.lang.NoClassDefFoundError: ellsworth I am lazy at the moment, my classpath is not set and I couldn't be bothered stuffing with it, so to get java to run, I change the usual.. java ellsworth ....to java -cp . ellsworth ..which includes the current directory If that solves the problem it is almost certainly a 'classpath' problem, but note that class names would generally start with a Capital letter, ellsworth -> Ellsworth, which also seems like a rather odd name for a class. HTH -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site Back to top jay1000 Guest Posted: Fri Jan 02, 2004 8:15 pm    Post subject: Re: Newbie Squared - Can't Run At All "Andrew Thompson" <andrew64 (AT) bigNOSPAMpond (DOT) com> wrote Quote: "jay1000" <jfschonREMoVE (AT) yahoo (DOT) com> wrote in message news:qT2Jb.39562$Fg.32197 (AT) lakeread01 (DOT) .. Exception in thread "main" java.lang.NoClassDefFoundError: ellsworth I am lazy at the moment, my classpath is not set and I couldn't be bothered stuffing with it, so to get java to run, I change the usual.. java ellsworth ....to java -cp . ellsworth ..which includes the current directory If that solves the problem it is almost certainly a 'classpath' problem, but note that class names would generally start with a Capital letter, ellsworth -> Ellsworth, which also seems like a rather odd name for a class. HTH -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site Thanks - your inclusion of current directory was the tip-off. I added my compiled java directory to CLASSPATH and that seems to have solved the problem. I also changed CLASSPATH to point to lib/tools.jar instead of just lib so I don't know which fix really solved the problem - maybe both. It's real easy to change PATH and CLASSPATH in Windows XP. Beats all that fiddling with autoexec and config files. Jay Back to top jay1000 Guest Posted: Mon Jan 05, 2004 6:01 am    Post subject: Re: Newbie Squared - Can't Run At All "La?ie Techie" <laie (AT) wing_this_etsolutions (DOT) com> wrote Quote: On Fri, 02 Jan 2004 15:15:04 -0500, jay1000 wrote: Thanks - your inclusion of current directory was the tip-off. I added my compiled java directory to CLASSPATH and that seems to have solved the problem. I also changed CLASSPATH to point to lib/tools.jar instead of just lib so I don't know which fix really solved the problem - maybe both. By default, sun's java boot classpath includes all the files in %JAVA_HOME%lib and %JAVA_HOME%jrelib, so you don't need to explicitly include them. In your case, %JAVA_HOME% is C:j2sdk1.4.2_03 HTH, La'ie Techie My problem was I didn't know about java's boot classpath and, for convenience, stuck all compiled java in c:javacompiled. Seemed simpler than using that crazy directory name. Thanks for the clarification. 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