Unhelpful exception when user forgets to put @Remotable on Java service 
interface when it is wired to a WSDL interface (or used over WS binding).
-------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: TUSCANY-1663
                 URL: https://issues.apache.org/jira/browse/TUSCANY-1663
             Project: Tuscany
          Issue Type: Bug
          Components: Java SCA Problem Determination
            Reporter: Rashmi Hunt


Unhelpful exception when user forgets to put @Remotable on Java service 
interface when it is wired to a WSDL interface (or used over WS binding).

If I had a Java impl with an @Service pointing to a Java interface on which I 
forget the @Remotable annotation, and for which I had exposed the service via 
the WS binding with an <interface.wsdl> in SCDL I ended up with:


                  java.lang.NullPointerException
        at 
org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceUtil.findMethod(JavaInterfaceUtil.java:52)
        at 
org.apache.tuscany.sca.implementation.java.invocation.JavaComponentInfo.createTargetInvoker(JavaComponentInfo.java:388)
        at 
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationProvider.createInvoker(JavaImplementationProvider.java:132)
        at 
org.apache.tuscany.sca.core.runtime.CompositeActivatorImpl.addImplementationInterceptor(CompositeActivatorImpl.java:510)
        at 
org.apache.tuscany.sca.core.runtime.CompositeActivatorImpl.createWires(CompositeActivatorImpl.java:385)
        at 
org.apache.tuscany.sca.core.runtime.CompositeActivatorImpl.createRuntimeWires(CompositeActivatorImpl.java:269)
        at 
org.apache.tuscany.sca.core.runtime.CompositeActivatorImpl.activate(CompositeActivatorImpl.java:578)
        at 
org.apache.tuscany.sca.host.embedded.impl.EmbeddedSCADomain$DomainCompositeHelper.addComposite(EmbeddedSCADomain.java:124)



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