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<runtime> <library name="contribjunitjar"> <export name="*"/> <packages prefixes="orgeclipsecontributionjunit"/> </library> </runtime> With this additional information the plug-in class loader only starts the class look-up for its own classes when the class matches the prefix string However, keep in mind that a typo in the prefix or forgetting to update the prefixes when adding a package with a new prefix will result in a ClassNotFoundException Such exceptions can be tricky to debug Therefore, when getting a ClassNotFoundException, you will want to check the package prefixes definition
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293 Separating Published from Internal Packages
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We need to arrange our plug-in so readers will know what is important and what is not, what is stable and what is likely to change The Invitation Rule tells us to invite contributions One way to invite contributions is to publish extension points, la the Explicit Extension Rule Another form of contribution is to expose some of your programmatic interface for others to use Published APIs should also be explicit: EXPLICIT API RULE Separate the API from internals Designers need freedom If you publish all functionality as potentially useful APIs, when you want to change the internal structure you break all clients If you don't carefully define the API, you as a designer gradually lose your freedom to innovate
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STABILITY RULE Once you invite others to contribute, don't change the rules Once you have published an API, it is rude to change it without a compelling reason If I have written a plug-in based on your version 10, I'd like it to work without modification on your version 11 Keeping the API stable is to both of our benefits, except if it's wrong The need to balance stability and growth leads us to the third API-related rule:
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DEFENSIVE API RULE Reveal only the API in which you have confidence, but be prepared to reveal more API as clients ask for it The convention for combining these rules in Eclipse is for every plug-in intended for external use to have two name spaces If a package name contains internal, the classes it contains are not intended to be used outside the plug-in Other packages can be considered published, available for subsequent extenders to use The nice, short package name is for the API, the long name is for internals Using package-private classes and interfaces is another way of satisfying the Explicit API Rule We have already chosen the API we want to publish To follow the Eclipse convention we keep our API classes ITestRunListener and JUnitCore in orgeclipsecontributionjunit We move all the other packages to the internal namespace: orgeclipsecontributionjunitinternal*
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When you define the API, you often have to move classes and rename packages JDT provides refactoring support to do so However, by default, Java source code is refactored When doing plug-in development you have to remember that fully qualified class names also occur in the pluginxml file Therefore, when renaming or moving a Java element, these class references need to be updated as well Fortunately, the Rename and Move refactorings provide an option to update fully qualified names in non-Java files When doing plug-in development, add pluginxml to the list of file name patterns to be considered during a refactoring See the following dialog for an example
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In the package restructuring we just did in orgeclipsecontributionjunit updating the pluginxml wasn't sufficient We are also referring to class names in strings To update the references in strings you can check the Update references in string literals There are two class references in strings: The path to the resource bundle inJUnitMessagesBUNDLE_NAME The name of the main class to launch in theTestRunner
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