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From: Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Compile Problem involving Dependencies
Date: Sat, 29 Oct 2011 17:24:42 +0000 (UTC)
Organization: UK Free Software Network
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On Sat, 29 Oct 2011 17:06:46 +0000, Novice wrote:

> I'm having a problem compiling some Java code which I _think_ has to do
> with a dependency issue that I don't fully understand. I wonder if
> someone here can enlighten me?
> 
> I have a class named FooApplet which is defined as public and extends
> JApplet. FooApplet makes use of a class I wrote called WrapUtils, which
> is simply a public class. WrapUtils in turn makes use of other classes I
> wrote called ErrorUtils and CountUtils, both of which are simply public
> classes.
> 
> I'm using Eclipse 3.7 and FooApplet compiles just fine. However,
> WrapUtils shows compile errors at every mention of ErrorUtils and
> CountUtils. ErrorUtils and CountUtils both compile cleanly.
> 
> The suggested fixes for the errors in WrapUtils include generating an
> import statement for ErrorUtils and CountUtils, even though they are in
> the same package as WrapUtils. When I click on the option to generate
> those imports, the import statement is NOT added to WrapUtils and the
> errors for ErrorUtils and CountUtils remain. The red "x" remains on
> WrapUtils both in the editor and in Package Explorer. Why does Eclipse
> not see the ErrorUtils and CountUtils? All of the classes are public and
> all of WrapUtils, CountUtils and ErrorUtils are in the same package,
> although it is a different package than the one containing FooApplet?
> 
> So, to recap, we have:
> 
> com.foo.FooApplet (public extends JApplet)
>   - invokes com.foo.utilities.WrapUtils (public)
>     - invokes com.foo.utilities.CountUtils (public)
>     - invokes com.foo.utilities.ErrorUtils (public)
> 
> All references to CountUtils and ErrorUtils in WrapUtils are flagged as
> compile errors: "CountUtils cannot be resolved".
> 
> What stupid mistake am I making? Is this a dependency error? Or is the
> fact that the methods in WrapUtils, CountUtils and ErrorUtils are all
> static that are the source of the problem?

You don't mention where the classes are in your directory structure or 
the package name of FooApplet. I would assume that, relative to where 
Eclipse is run you'd find that

- FooApplet contains the "package com.foo;" declaration

- all three other sources contain the "package com.foo.utilities;"
  declaration.

- the path names of the .java files relative to the Eclipse root are:

  com/foo/FooApplet.java
  com/foo/utilities/WrapUtils.java 
  com/foo/utilities/CountUtils.java 
  com/foo/utilities/WrapUtils.java 

If your package declarations and relative pathnames differ, thats most 
likely the cause.
 

-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |