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POChanging function prototype generates "cannot be resolved. It is indirectly referenced" error
 

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    <p>In researching this problem, I've run into a lot of posts that have seen errors similar to the title of this post. This problem is different in that the error only shows up when I try to pass <em>String</em> to functions of a plugin class I'm developing.</p> <p>I did find one post <a href="https://stackoverflow.com/questions/12221594/rap-how-to-access-object-in-viewpart">RAP: How to access Object in ViewPart</a> that may be hinting at my issue.</p> <p>Although I'm running Eclipse 3.6.1, I think this question is about general Java. My main issue is that I have a class (class A) in one Eclipse project that uses another class (class B) in an Eclipse plug-in project. A cannot call any functions of class B that require a <em>String</em> as one of the arguments. I generated a dummy class C (along with a dummy Java project) that uses class B and I still have the same issues. Let me elaborate some.</p> <p>I have two projects in Eclipse. One of them is an Eclipse plugin project that contains a class that is essentially a plotter and that extends <em>org.eclipse.ui.part.ViewPart</em>. I am instantiating this plotter class from another non-plugin project which cannot call any member functions from the plotter class that expect a <em>String</em> as one of the arguments.</p> <p>For example, the following code snippet:</p> <pre><code>Plotter myPlotter = new Plotter(); myPlotter.plot(); </code></pre> <p>works correctly when run from my non-plugin project. If, however, I modify <em>plot</em> to expect a <em>String</em> (say, for a label), or even create a new function that prints a <em>String</em>:</p> <pre><code>Plotter myPlotter = new Plotter(); String theString = "I'm the String"; myPlotter.plot(theString); myPlotter.printMe(theString); </code></pre> <p>Eclipse gives me red underlines under <em>printMe</em> and <em>plot</em> indicating an error. When I hover over <em>printMe</em>, I get the error: <em>The type org.eclipse.ui.part.ViewPart cannot be resolved. It is indirectly referenced from required .class files</em></p> <p>To try to understand this problem a little better, I built another two classes in the plugin project to test the issue, one whose superclass is <em>java.lang.Object</em>, the other whose superclass is <em>org.eclipse.ui.part.ViewPart</em>. I can call functions with <em>String</em> arguments from the <em>Object</em>-based class but I cannot call functions with String as arguments from the <em>ViewPart</em>-based class. So it has something to do with <em>ViewPart</em> (I can drill down to subsequent superclasses and still have the problem if the class inherits from <em>EventManager</em>). Just for kicks, I tried changing the class so it extends <em>Vector</em> and my problem disappears. It looks to me like the problem is related to <em>EventManager</em> and/or <em>ViewPart</em>.</p> <p>Any insights would be greatly appreciated.</p>
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    1. USMrMas
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    1. COPerform a clean on all projects (Project -> Clean). That might help.
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      1. USChris Gerken
    2. CO@ChrisGerken -- I thought that was a good idea which I hadn't tried. Unfortunately, it didn't improve my situation.
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      1. USMrMas
 

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