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Java Forum / First Aid / October 2006Newbie - Hello World
Hi I know this is the most simple of things to do but for some reason it does not work for me. I have created the wonder Hello World App and it complies fine, but when i run the class it does not work it comes up with the following error: Exception in thread "main" java.lang.NoClassDefFoundError: HelloApp/Class the code that i created is the following: public class HelloApp { public static void main(String[] args) { System.out.println("Hello, World!"); } } Thanks for the help, i really want to learn java, so if anyone can point be to any good tutes tht would also be a great help. G > Hi > [quoted text clipped - 20 lines] > > G Try running it using java HelloApp (instead of java.HelloApp.class) >>Hi >> [quoted text clipped - 26 lines] > > (instead of java.HelloApp.class) Thats how i ran it and it comes up with that error, any idea? could it be the way i have set up the java enviroment on my computer? > Exception in thread "main" java.lang.NoClassDefFoundError: HelloApp/Class Papastefanos Serafeim wrote: > Try running it using > java HelloApp > > (instead of java.HelloApp.class) > Thats how i ran it and it comes up with that error, any idea? You are contradicting yourself. If that's really how you ran it, then the error message you posted earlier is not the error message you received. Post the real error message, or check the command line again. /gordon  Signature[ don't email me support questions or followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >>Exception in thread "main" java.lang.NoClassDefFoundError: HelloApp/Class > [quoted text clipped - 13 lines] > > /gordon hi gordon sorry take the /class off the error line i ran it two ways java HelloApp and java HelloApp.class the only difference that i got in the error message was the /class sorry does this make more sense? I cant post a screen shot here can i to show what i am doing? >>> Exception in thread "main" java.lang.NoClassDefFoundError: >>> HelloApp/Class [quoted text clipped - 3 lines] >>> Try running it using >>> java HelloApp > sorry take the /class off the error line > [quoted text clipped - 11 lines] > > I cant post a screen shot here can i to show what i am doing? May be you forgot to run java compiler? javac HelloApp.java Glenn Coyle schrieb: >>> Exception in thread "main" java.lang.NoClassDefFoundError: >>> HelloApp/Class [quoted text clipped - 32 lines] > > I cant post a screen shot here can i to show what i am doing? try "java -cp . HelloApp" in the directory containing HelloApp.class > i ran it two ways > [quoted text clipped - 5 lines] > > the only difference that i got in the error message was the /class In that case try: java -cp . HelloApp /gordon Signature[ don't email me support questions or followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >>i ran it two ways >> [quoted text clipped - 11 lines] > > /gordon winner gold mate that works, can you let me know why it works this way and not the other sorry to be a pain > gold mate that works, can you let me know why it works this way and > not the other The argument to "java" isn't a filename, it's a classname. Java searches the classpath for the class, and "-cp ." adds the current directory to the classpath. You could also set CLASSPATH=. in your environment. /gordon Signature[ don't email me support questions or followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >> gold mate that works, can you let me know why it works this way and >> not the other [quoted text clipped - 3 lines] > directory to the classpath. You could also set CLASSPATH=. in your > environment. This means that for all code you write or use, java searches all the paths in classpath to find the classes it is looking. A CLASSPATH or -cp can look like this: CLASSPATH=.:/my/project/lib:/my/project/module1 In all these paths you can store any classfiles or jar files (Java class ARchives) you need. This is basically a way to organise your code into modules and allow access to external libraries. tom > >> gold mate that works, can you let me know why it works this way and > >> not the other [quoted text clipped - 15 lines] > > tom And don't forget that the package name acts as a sort of folder or directory as well... Getting a simply Java program running with the JDK is always a challenge. I put together some free multimedia tutorials on my website that show exactly what you need to do to get your simply Hello World Java programs working with javac and the java utility. www.scja.com Cheers! -Cameron McKenzie Author of What is WebSphere? For Free Java Certification Mock Exams: www.scja.com Free Java and J2EE Multimedia Tutorials: www.mcnz.com www.pulpjava.com www.technicalfacilitation.com > Hi > [quoted text clipped - 20 lines] > > G 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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