NPE when loading componentType side file with callbackInterface attribute 
defined  
-----------------------------------------------------------------------------------

                 Key: TUSCANY-967
                 URL: http://issues.apache.org/jira/browse/TUSCANY-967
             Project: Tuscany
          Issue Type: Bug
            Reporter: Lou Amodeo


A Remote service that has a callback interface defined in a componentType file 
receives a NPE when loading the componentType side file. . 

[INFO] [tuscany-itest:start {execution: start}]
[INFO] Starting Tuscany...
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
        at 
org.apache.tuscany.core.implementation.processor.ServiceProcessor.visitField(ServiceProcessor.java:149)
        at 
org.apache.tuscany.core.implementation.IntrospectionRegistryImpl.introspect(IntrospectionRegistryImpl.java:97)
        at 
org.apache.tuscany.core.implementation.java.JavaComponentTypeLoader.loadByIntrospection(JavaComponentTypeLoader.java:79)
        at 
org.apache.tuscany.core.implementation.java.JavaComponentTypeLoader.load(JavaComponentTypeLoader.java:66)
        at 
org.apache.tuscany.core.implementation.java.JavaComponentTypeLoader.load(JavaComponentTypeLoader.java:44)
        at 
org.apache.tuscany.core.loader.LoaderRegistryImpl.loadComponentType(LoaderRegistryImpl.java:163)
        at 
org.apache.tuscany.core.implementation.java.JavaImplementationLoader.load(JavaImplementationLoader.java:58)
        at 
org.apache.tuscany.core.loader.LoaderRegistryImpl.load(LoaderRegistryImpl.java:94)
        at 
org.apache.tuscany.core.loader.ComponentLoader.loadImplementation(ComponentLoader.java:184)
        at 
org.apache.tuscany.core.loader.ComponentLoader.load(ComponentLoader.java:128)
        at 
org.apache.tuscany.core.loader.ComponentLoader.load(ComponentLoader.java:70)
        at 
org.apache.tuscany.core.loader.LoaderRegistryImpl.load(LoaderRegistryImpl.java:94)
        at 
org.apache.tuscany.core.implementation.composite.CompositeLoader.load(CompositeLoader.java:81)
        at 
org.apache.tuscany.core.implementation.composite.CompositeLoader.load(CompositeLoader.java:55)
        at 
org.apache.tuscany.core.loader.LoaderRegistryImpl.load(LoaderRegistryImpl.java:94)
        at 
org.apache.tuscany.core.loader.LoaderRegistryImpl.load(LoaderRegistryImpl.java:112)
        at 
org.apache.tuscany.core.implementation.composite.CompositeComponentTypeLoader.loadFromSidefile(CompositeComponentTypeLoader.java:65)
        at 
org.apache.tuscany.core.implementation.composite.CompositeComponentTypeLoader.load(CompositeComponentTypeLoader.java:57)
        at 
org.apache.tuscany.core.implementation.composite.CompositeComponentTypeLoader.load(CompositeComponentTypeLoader.java:39)
        at 
org.apache.tuscany.core.loader.LoaderRegistryImpl.loadComponentType(LoaderRegistryImpl.java:163)
        at 
org.apache.tuscany.core.deployer.DeployerImpl.load(DeployerImpl.java:101)
        at 
org.apache.tuscany.core.deployer.DeployerImpl.deploy(DeployerImpl.java:76)
        at 
org.apache.tuscany.core.runtime.AbstractRuntime.deployApplicationScdl(AbstractRuntime.java:136)
        at 
org.apache.tuscany.sca.plugin.itest.MavenEmbeddedRuntime.initialize(MavenEmbeddedRuntime.java:85)
        at 
org.apache.tuscany.sca.plugin.itest.TuscanyStartMojo.execute(TuscanyStartMojo.java:102)
        at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:412)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:534)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:475)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:454)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:306)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:273)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:140)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:615)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7 seconds
[INFO] Finished at: Fri Dec 01 08:03:06 EST 2006
[INFO] Final Memory: 6M/19M
[INFO] ------------------------------------------------------------------------


ComponentType file:   CallBackCTypeServiceImpl.componentType

<?xml version="1.0" encoding="ASCII"?>
<componentType xmlns="http://www.osoa.org/xmlns/sca/1.0"; >
  <service name="CallBackCTypeService">
     <interface.java 
interface="org.apache.tuscany.sca.test.CallBackCTypeService" 
         
callbackInterface="org.apache.tuscany.sca.test.CallBackCTypeCallBack"/> 
  </service>
</componentType>  


package org.apache.tuscany.sca.test;
import org.osoa.sca.annotations.Remotable;

@Remotable
 
public interface CallBackCTypeService {  

    public void knockKnock(String aString);
    public void noCallBack(String aString);
    public void multiCallBack(String aString); 
   
}

package org.apache.tuscany.sca.test;

import org.osoa.sca.annotations.Callback;
import org.osoa.sca.annotations.Remotable;
import org.osoa.sca.annotations.Service;

@Service(CallBackCTypeService.class)

public class CallBackCTypeServiceImpl implements CallBackCTypeService {

        @Callback 
        protected CallBackCTypeCallBack callback; 


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