[news.eclipse.newcomer] Re: Delete HelloWorld.class file, won't run agai

[Eric Rizzo <eclipse@xxxxxxxxxxxx>]

Diviner wrote:
> Eric Rizzo,
>
> I don't know do compile/re-compile in a separate operation. I do
> it in Run->Run from context menu of Project in Package Explorer
> or Run->Run Application then select particular project.

If you deleted the .class file, you have to re-compile it. As I said 
below, you can do that by either touching the source code and saving it, 
or by choosing Project > Clean from the menu.



> > Diviner wrote:
> >
> > > Hi all,
> > >
> > > I tried to write a simple console application "HelloWorld" and
> > > work well in a development cycle. Then I tried to delete the
> > > HelloWorld.class to let Eclipse make it for me again, but
> > > always failed. It gave me the error:
> > >    java.lang.NoClassDefFoundError: HelloWorld
> > >    Exception in thread "main"
> > >    (with a dialog -- "Could not find the main class. Program will exit")
> >
> >
> >
> > After you deleted the .class file, how did you tell Eclipse to 
> > re-compile it for you? In a standard configuration, Eclipse will 
> > re-build the project (re-compile all Java source files) when you make 
> > a change to the source and save it, or if you select Project > Clean 
> > from the menu.
> >
> > HTH,
> >     Eric