Re: InstructionHandle to Declared Exceptions

Hi Elliot

You could try using 'Repository.loadClass' to load a class (which should 
use your existing class loading hierarchy) this will produce a 
'JavaClass' object from which you will be able to create a 'ClassGen' to 
get a 'MethodGen', or create a 'MethodGen' from the 'Method' 
(JavaClass.getMethods() then search for name or signature) your 
concerned with. From there 'MethodGen' has a method 'getExceptions()' 
which returns an array of Strings for the exception names. I think 
Repository uses the normal java class loading mechanisms so if these 
were causing your troubles this may still be the case if so have a look 
at the interface 'org.apache.bcel.util.Repository' implementations of 
which allow you to specify a classloader or generally have other options.

Hope this helps

Bye Arrin

Elliot Barlas wrote:

>I have an InstructionHandle containing an InvokeVirtual
>instruction and I would like to get the list of all
>declared exceptions thrown by the virtual method
>invocation.  I have tried the following:
>
>1. Get the InvokeVirtual instruction from handle
>2. Get the ReferenceType from the instruction
>3. Cast the ReferenceType to an ObjectType when safe to
>do so.
>4. Get the class name from the ObjectType
>5. Get the Class object from the class name via
>Class.forName(className)
>6. Get an array of methods for the Class
>7. Get the method name from the InvokeVirtual instruction
>8. Find the java.lang.reflect.Method in the array with
>the given name
>9. Get an array of exception Classes from the method
>
>This should be sufficient, but in the environment that I
>am working in, there are multiple class loaders and the
>class lookup (Class.forName) is failing.  Does anyone
>know how to do something equivalent in BCEL alone without
>requiring the use of Java reflection or class lookups?
>
>Thanks,
>Elliot
>
>  
>

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