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POHow to identify a missing method (Binary Compatibility) in a JAR statically
 

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  1. POHow to identify a missing method (Binary Compatibility) in a JAR statically
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    <p>I want to verify binary compatibility between 2 JARs. </p> <p>Following the suggestions in this <a href="https://stackoverflow.com/questions/972087/how-can-i-visualize-jar-not-plugin-dependencies/972199#972199">answer</a> I used <a href="http://www.jboss.org/tattletale" rel="nofollow noreferrer">jboss tattletale</a> but it can find only missing classes.</p> <p>How can I find if there are missing methods? Is it possible at all?</p> <p>E.g.</p> <p><strong>"Depends - on" class</strong> Foo depends on Bar (like many other middle class workers)</p> <pre><code>import org.overlyusedclassnames.Bar public class Foo{ public void someMethod(){ Bar tender = new Bar(); tender.getJohnnyRedLabel(); tender.getJohnnyBlueLabel(); //this method is new in the Bar class } } </code></pre> <p><strong>"Compile time" class</strong></p> <pre><code>package org.overlyusedclassnames; /** * @Since 1992 * Changes: added blue and gold Johnny Walker labels */ public class Bar { public Drink getJohnnyRedLabel(){ return new JohnyWalkerFactory.get(RedLabel.class); } public Drink getJohnnyBlackLabel(){ return new JohnyWalkerFactory.get(BlackLabel.class); } public Drink getJohnnyGoldLabel(){ return new JohnyWalkerFactory.get(GoldLabel.class); } public Drink getJohnnyBlueLabel(){ return new JohnyWalkerFactory.get(BlueLabel.class); } } </code></pre> <p>Now imagine an <strong>old</strong> Bar jar is accedently replacing the compiled time bar: </p> <p><strong>"Runtime time" class</strong></p> <pre><code>package org.overlyusedclassnames; /** * @Since 1909 * Changes: added red and black Johnny Walker labels */ public class Bar { public Drink getJohnnyRedLabel(){ return new JohnyWalkerFactory.get(RedLabel.class); } public Drink getJohnnyBlackLabel(){ return new JohnyWalkerFactory.get(BlackLabel.class); } } </code></pre> <p>Is there a way to identify the missing method without running it and getting a <code>NoSuchMethodError</code>?</p> <hr> <p><strong>Disclaimer</strong>: This is a major rephrasing of my own <a href="https://stackoverflow.com/questions/2037157/how-to-identify-a-potential-nosuchmethoderror-or-a-linkageerror-in-a-closed-jar">related question</a>, which is undeletable. I chose asking a new question because the rephrasing will render the current 2 answers as quite unrelated to the topic.</p>
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    1. COyou can comment on the other question that it should be closed, and super users can close it for you
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    2. CO@Yoni - already did that
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    3. CO"without running it"=="statically" (in the title of question)
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