Proxy classes and reflection (IllegalAccessException)

[Stephane Epardaud]

IIRC RestEasy needs to add a module read to that Class's module it wants 
to create a Proxy of.

On 07/04/16 14:05, Alan Bateman wrote:
> On 07/04/2016 12:39, Dawid Weiss wrote:
>> I don't want to hijack the other thread, so here's a new one I'm stuck
>> with. I get this exception (simplified stack trace a bit):
>>
>> Caused by: java.lang.IllegalAccessException: class
>> org.jboss.resteasy.core.ContextParameterInjector cannot access class
>> com.sun.proxy.jdk.proxy2.$Proxy65 (in module jdk.proxy2) because
>> module jdk.proxy2 does not export com.sun.proxy.jdk.proxy2 to unnamed
>> module @79ca92b9
>> at 
>> sun.reflect.Reflection.throwIllegalAccessException(java.base at 9-ea/Reflection.java:411)
>> at 
>> sun.reflect.Reflection.throwIllegalAccessException(java.base at 9-ea/Reflection.java:402)
>> at 
>> sun.reflect.Reflection.ensureMemberAccess(java.base at 9-ea/Reflection.java:99)
>> at 
>> java.lang.reflect.AccessibleObject.slowCheckMemberAccess(java.base at 9-ea/AccessibleObject.java:355)
>> at 
>> java.lang.reflect.AccessibleObject.checkAccess(java.base at 9-ea/AccessibleObject.java:347)
>> at 
>> java.lang.reflect.Constructor.newInstance(java.base at 9-ea/Constructor.java:444)
>> at 
>> org.jboss.resteasy.core.ContextParameterInjector.createProxy(ContextParameterInjector.java:94)
>> ... 53 more
>>
>> I think RestEasy attempts to do create a new instance of a proxy class
>> here (the complete process here eludes my understanding for now). Any
>> clues how this can be solved?
> I assume it should be using newProxyInstance rather that trying to 
> instantiate the proxy class directly. The reason it can't instantiate 
> it directly is because it has been generated into a "dynamic module" 
> (jdk.proxy2 in this case). I assume you'll find that the proxy was 
> created with an interface that is not in an exported package.
>
> The "Package and Module Membership of Proxy Class" and "Dynamic 
> Modules" sections of the Proxy javadoc [1] has all the details.
>
> -Alan.
>
> [1] 
> http://download.java.net/java/jdk9/docs/api/java/lang/reflect/Proxy.html
>
>