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    <p>First of all, overriding <code>Object.metaClass.invokeMethod</code> doesn't work because when Groovy tries to resolve a method call for a type X, it checks the metaClass of X, but not the metaClass of its parent class(es). For example, the following code will print "method intValue intercepted"</p> <pre><code>Integer.metaClass.invokeMethod = {def name, def args -&gt; System.out.println("method $name intercepted") } 6.intValue() // Reset the metaClass Integer.metaClass = null </code></pre> <p>But this code will not:</p> <pre><code>Object.metaClass.invokeMethod = {def name, def args -&gt; System.out.println("method $name intercepted") } 6.intValue() // Reset the metaClass Object.metaClass = null </code></pre> <p>Your question was "Is it possible to intercept all the methods called in a application?", but could you be a bit more precise about whether you want to:</p> <ul> <li>Intercept calls to Groovy methods, Java methods, or both</li> <li>Intercept calls to only <em>your</em> Groovy/Java methods or also intercept calls to Groovy/Java library classes</li> </ul> <p>For example, if you only want to intercept calls to your Groovy classes, you could change your classes to implement <a href="http://groovy.codehaus.org/api/groovy/lang/GroovyInterceptable.html" rel="nofollow noreferrer">GroovyInterceptable</a>. This ensures that invokeMethod() is invoked for every method called on those classes. If the nature of the interception (i.e. the stuff you want to do before/after invoking the called method) is the same for all classes, you could define <code>invokeMethod()</code> in a separate class and use <code>@Mixin</code> to apply it to all your classes.</p> <p>Alternatively, if you also want to intercept calls to Java classes, you should check out the <a href="http://groovy.codehaus.org/Using+the+Delegating+Meta+Class" rel="nofollow noreferrer">DelegatingMetaClass</a>.</p>
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    1. POHow can I intercept execution of all the methods in a Java application using Groovy?
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    1. COI'd like to be able to intercept both Groovy and Java methods calls.
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    2. COThen you should use DelegatingMetaClass or a full-blown AOP framework such as groovy-aop or AspectJ
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    3. COYou can't intercept *all* method calls with a metaClass, because Java methods called from Java wont go through Groovy dispatch. So if you have a Java class calling another Java class, you can't intercept that call without using some sort of AOP or something like that.
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