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javassist and interfaces defining a method which throws an exception question
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created by <a href="https://community.jboss.org/people/amitabakoptier">ami tabak</a> in <i>Javassist Development</i> - <a href="https://community.jboss.org/message/777034#777034">View the full discussion</a>
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<div class="jive-rendered-content"><p> <span style="font-size: 10.0pt; font-family: 'Courier New';">A Question regarding the JVM spec and how javassist is expected to handle it.</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">I’ve an interface IMyFactory extending the Remote interface.</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">It declares a method foo() which declares throws RemoteException so will be deemed as remotable API</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">The implementing class implements the method but <strong style="text-decoration: underline;">doesn’t</strong> declare itself as throwing the remote.</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">Code wise the JVM picked this method as valid Remote API</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">Javassist when interrogated class MyFactory.foo() method doesn’t provide any data on its being a throwing RemoteException </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong style=": ; font-size: 10.0pt; font-family: 'Courier New'; text-decoration: underline;">Questions</strong></p><ol style="list-style-type: decimal;"><li><span style="font-size: 10.0pt; font-family: 'Courier New';">The JVM spec defines a method by its name and properties, not by its exception throwing.</span></li></ol><p><span style="font-size: 10.0pt; font-family: 'Courier New';">In addition it allows an implementing method to declare less “throws” then its super / defining interface without loss of polymorphism</span></p><ol style="list-style-type: lower-alpha;"><li><span style="font-size: 10.0pt; font-family: 'Courier New';">e.g. this foo() implementer is deemed the same as in the interface.</span></li></ol><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">Why wont javassist provide me the exception data defined in the Interface’s CtClass ? </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">   2) Is there a “recoursive” API in javassist that will wllow me to intergoate a method up to its interface definition to see if some one above it has defined it to be an   </span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">      Throwable thrower or do I need to implement such search myself ? </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong style=": ; font-size: 10.0pt; font-family: 'Courier New'; text-decoration: underline;">Code example: </strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><ol style="list-style-type: decimal;"><li><span style="font-size: 10.0pt; font-family: 'Courier New';">1. MyFactory implements IMyFactory</span></li></ol><p><span style="font-size: 10.0pt; font-family: 'Courier New';">   {...</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">     @Override</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">     public int foo() //on purpose didn’t declare “throws java.rmi.RemoteException”</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">     { </span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">       // TODO Auto-generated method stub</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">       return 0;</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">     }   </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><ol style="list-style-type: decimal;"><li><span style="font-size: 10.0pt; font-family: 'Courier New';">2. public interface IMyFactory extends Remote</span></li></ol><p><span style="font-size: 10.0pt; font-family: 'Courier New';">   {</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">     public int foo() throws RemoteException;</span></p><p><span style="font-size: 10.0pt; font-family: 'Courier New';">   }</span></p></div>
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