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| <h1>Proxies |
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| <p><a name="Proxies-Where'stheJavasourcefortheproxies?"></a></p> |
| |
| <h1>Where's the Java source for the proxies?</h1> |
| |
| <p>The short answer is we do not generate java code containing any ejb logic |
| at all as other platforms like WebSphere and WebLogic do. We use dynamic |
| proxy generation via java.lang.reflect.Proxy.</p> |
| |
| <p>Most of the commercial platforms predate dynamic proxy generation and not |
| only statically generate java files which are then compiled and included in |
| the app but decided as long as they were generating java files that they |
| would jam-pack them with as many optimizations as they could. The result |
| was that significant portions of your application data such as transaction |
| attributes and database queries were stuck in generated vendor code. We |
| don't have any equivalent to that.</p> |
| |
| <p>Dynamic proxies such as java.lang.reflect.Proxy or cglib byte code in |
| memory, not java source, which is immediately turned into a class |
| definition and used. The basic paradigm is that you give the library the |
| interfaces you want implemented and some sort of Handler object. The |
| library will give you back a proxy instance that does nothing more than |
| call your handler every time a method is called. Now it's possible with |
| some trickery to pull the byte code for any java.lang.Class instance out of |
| the classloader and then use some sort of java decompiler library to turn |
| that into some sort of java source file, however there's no real motivation |
| to do so as the VM generated proxies are quite dumb and the code that does |
| all the work is not generated and available for download or svn checkout.</p> |
| |
| <p>If you are coming from a commercial vendor and simply looking for a good |
| place to begin your debugging, look for implementations |
| java.lang.reflect.InvocationHandler and slap a breakpoint in the "invoke" |
| method and you'll be all set.</p> |
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