[jboss-dev-forums] [JBoss Microcontainer Development] - Dependency on non-existant bean when trying to create

[kabir.khan@jboss.com]

What's wrong with this? Attempting to add the intermediate bean mentioned in http://www.jboss.org/index.html?module=bb&op=viewtopic&t=162791. I found that adding BeanMetaData as a property to a bean seems to cause an unresolved dependency:

  | public class ThrowawayTestCase extends MicrocontainerTest
  | {
  | 
  |    public ThrowawayTestCase(String name)
  |    {
  |       super(name);
  |    }
  | 
  |    
  |    public void testIndirectBean() throws Throwable
  |    {
  |       BeanMetaDataBuilder builder = BeanMetaDataBuilder.createBuilder("Bean", MyBean.class.getName());
  |       BeanMetaData bmd = builder.getBeanMetaData();
  |       
  |       builder = BeanMetaDataBuilder.createBuilder("BeanInstaller", MyBeanInstaller.class.getName());
  | //      builder.addPropertyMetaData("context", builder.createFromContextInject(FromContext.CONTEXT));	//1
  |       builder.addPropertyMetaData("beanMetaData", builder.createValue(bmd));	//2
  |       KernelControllerContext ctx = deploy(builder.getBeanMetaData());
  |       try
  |       {
  |          System.out.println("----------> " + ctx.getDependencyInfo().getIDependOn(null));
  |          MyBeanInstaller myBeanInstaller = assertBean("BeanInstaller", MyBeanInstaller.class);
  | 
  | //         MyBean myBean = assertBean("MyBean", MyBean.class);
  | //         assertNotNull(myBean);
  |       }
  |       finally
  |       {
  |          undeploy(ctx);
  |       }
  |    }
  | 
  |    public static class MyBeanInstaller
  |    {
  |       KernelControllerContext context;
  |       
  |       BeanMetaData beanMetaData;
  |       
  |       boolean started;
  |       
  |       public BeanMetaData getBeanMetaData()
  |       {
  |          return beanMetaData;
  |       }
  | 
  |       public void setBeanMetaData(BeanMetaData beanMetaData)
  |       {
  |          this.beanMetaData = beanMetaData;
  |       }
  | 
  |       public KernelControllerContext getContext()
  |       {
  |          return context;
  |       }
  | 
  |       public void setContext(KernelControllerContext context)
  |       {
  |          this.context = context;
  |       }
  | 
  |       public boolean isStarted()
  |       {
  |          return started;
  |       }
  | 
  |       public void start() throws Exception
  |       {
  | 	//Use context.getController() and beanmetadata to install indirect bean
  |       }      
  |    }
  |    
  |    public static class MyBean
  |    {
  |    }
  | }
  | 
The output dependency info is shown as:

  | ----------> [AbstractDependencyItem at 5f49d886{name=BeanInstaller dependsOn=Bean whenRequired=Configured dependentState=Installed resolved=false}]
  | 
Looking at the stack trace of AbstractDependencyItem's constructor it looks like the property value gets visited as well? 

  | Thread [main] (Suspended (breakpoint at line 78 in AbstractDependencyItem))	
  | 	AbstractDependencyItem.<init>(Object, Object, ControllerState, ControllerState) line: 78	
  | 	AbstractBeanMetaData.initialVisit(MetaDataVisitor) line: 669	
  | 	PreprocessMetaDataVisitor(AbstractMetaDataVisitor).internalInitialVisit(MetaDataVisitorNode) line: 111	
  | 	PreprocessMetaDataVisitor(AbstractMetaDataVisitor).initialVisit(MetaDataVisitorNode) line: 74	
  | 	AbstractValueMetaData.initialVisit(MetaDataVisitor) line: 116	
  | 	PreprocessMetaDataVisitor(AbstractMetaDataVisitor).internalInitialVisit(MetaDataVisitorNode) line: 111	
  | 	PreprocessMetaDataVisitor(AbstractMetaDataVisitor).initialVisit(MetaDataVisitorNode) line: 74	
  | 	AbstractPropertyMetaData(AbstractFeatureMetaData).initialVisit(MetaDataVisitor) line: 101	
  | 	AbstractPropertyMetaData.initialVisit(MetaDataVisitor) line: 287	
  | 	PreprocessMetaDataVisitor(AbstractMetaDataVisitor).internalInitialVisit(MetaDataVisitorNode) line: 111	
  | 	PreprocessMetaDataVisitor(AbstractMetaDataVisitor).initialVisit(MetaDataVisitorNode) line: 74	
  | 	AbstractBeanMetaData(AbstractFeatureMetaData).initialVisit(MetaDataVisitor) line: 101	
  | 	AbstractBeanMetaData.initialVisit(MetaDataVisitor) line: 680	
  | 	PreprocessMetaDataVisitor.run() line: 53	
  | 	AccessController.doPrivileged(PrivilegedAction<T>) line: not available [native method]	
  | 	AbstractKernelControllerContext.preprocessMetaData() line: 232	
  | 	AbstractKernelControllerContext.setController(Controller) line: 198	
  | 	AbstractKernelController(AbstractController).install(ControllerContext, boolean) line: 778	
  | 	AbstractKernelController(AbstractController).install(ControllerContext) line: 564	
  | 	AbstractKernelController.install(BeanMetaData, Object) line: 107	
  | 	AbstractKernelController.install(BeanMetaData) line: 101	
  | 	MicrocontainerTestDelegate.deploy(BeanMetaData) line: 329	
  | 	ThrowawayTestCase(MicrocontainerTest).deploy(BeanMetaData) line: 358	
  | 	ThrowawayTestCase.testIndirectBean() line: 54	
  | 

I'm not sure this is something we should fix, without a better understanding of how the value metadata is visited. I can work around it by creating an intermediate class

  |    public static class BeanMetaDataWrapper
  |    {
  |       private final BeanMetaData beanMetaData;
  |       
  |       public BeanMetaDataWrapper(BeanMetaData beanMetaData)
  |       {
  |          this.beanMetaData = beanMetaData;
  |       }
  | 
  |       public BeanMetaData getBeanMetaData()
  |       {
  |          return beanMetaData;
  |       }
  |    }
  |  
and to set that instead when creating BeanInstaller

  |       builder.addPropertyMetaData("beanMetaDataWrapper", builder.createValue(wrapper));
  | 



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