Re: T5 IoC: EagerLoad and ApplicationGlobals

Thu, 23 Jun 2011 05:52:06 -0700 

 I created a small app with which the problem occurs, too.
Here the snippet from AppModule:

public class AppModule {

    public static void contributeSymbolSource(
            final OrderedConfiguration<SymbolProvider> configuration,
@InjectService("TestSymbolProvider") SymbolProvider semedicoSymbolProvider) { 
        configuration.add("TestSymbolProvider", semedicoSymbolProvider);
    }
public static void contributeTestSymbolProvider(Configuration<Properties> conf, @InjectService("ApplicationGlobals")ApplicationGlobals applicationGlobals) { 
        Properties properties = null;
        ServletContext context = applicationGlobals.getServletContext();
InputStream is = context.getResourceAsStream("/WEB-INF/configuration.properties"); // NPE (sometimes) 
        properties = new Properties();
        try {
            properties.load(is);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        properties.setProperty("my.value", "A value.");
        conf.add(properties);
    }

    @EagerLoad
    @ServiceId("TestSymbolProvider")
    public static SymbolProvider buildTestSymbolProvider(
            final Collection<Properties> configurations) {
        Properties properties = null;
        Iterator<Properties> it = configurations.iterator();
        if (it.hasNext())
            properties = it.next();
        return new TestSymbolProvider(properties);
    }
If you would like to have a look on my exact code, I could send this example to you. It's barely more than the T5 Quickstart. I try to EagerLoad the SymbolSource (in lack of another eager loaded service which would simply rely on the TestSymbolProvider). contributeTestSymbolProvider is called and sometimes the NPE is thrown. 
Stack trace:
java.lang.RuntimeException: Error invoking service contribution method tests.mytapestrytest.services.AppModule.contributeTestSymbolProvider(Configuration, ApplicationGlobals): java.lang.NullPointerException at org.apache.tapestry5.ioc.internal.ContributionDefImpl.invokeMethod(ContributionDefImpl.java:139) at org.apache.tapestry5.ioc.internal.ContributionDefImpl.contribute(ContributionDefImpl.java:76) at org.apache.tapestry5.ioc.internal.RegistryImpl$8.run(RegistryImpl.java:615) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(OperationTrackerImpl.java:50) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(OperationTrackerImpl.java:48) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.run(OperationTrackerImpl.java:46) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.run(PerThreadOperationTracker.java:56) at org.apache.tapestry5.ioc.internal.RegistryImpl.addToUnorderedConfiguration(RegistryImpl.java:611) at org.apache.tapestry5.ioc.internal.RegistryImpl.getUnorderedConfiguration(RegistryImpl.java:475) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl$1.invoke(ServiceResourcesImpl.java:88) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl$1.invoke(ServiceResourcesImpl.java:86) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl.getUnorderedConfiguration(ServiceResourcesImpl.java:82) at org.apache.tapestry5.ioc.internal.AbstractServiceCreator.getUnorderedConfiguration(AbstractServiceCreator.java:132) at org.apache.tapestry5.ioc.internal.AbstractServiceCreator.access$100(AbstractServiceCreator.java:35) at org.apache.tapestry5.ioc.internal.AbstractServiceCreator$1.findResource(AbstractServiceCreator.java:99) at org.apache.tapestry5.ioc.internal.util.DelegatingInjectionResources.findResource(DelegatingInjectionResources.java:38) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateInjection(InternalUtils.java:254) at org.apache.tapestry5.ioc.internal.util.InternalUtils.access$000(InternalUtils.java:86) at org.apache.tapestry5.ioc.internal.util.InternalUtils$2.invoke(InternalUtils.java:303) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParameters(InternalUtils.java:307) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParametersForMethod(InternalUtils.java:270) at org.apache.tapestry5.ioc.internal.ServiceBuilderMethodInvoker.createObject(ServiceBuilderMethodInvoker.java:56) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29) at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46) at org.apache.tapestry5.ioc.internal.AdvisorStackBuilder.createObject(AdvisorStackBuilder.java:60) at org.apache.tapestry5.ioc.internal.InterceptorStackBuilder.createObject(InterceptorStackBuilder.java:52) at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.obtainObjectFromCreator(JustInTimeObjectCreator.java:68) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.createObject(JustInTimeObjectCreator.java:57) at $SymbolProvider_130bc880a66.delegate($SymbolProvider_130bc880a66.java) at $SymbolProvider_130bc880a66.valueForSymbol($SymbolProvider_130bc880a66.java) at org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl$SymbolExpansion.expandSymbol(SymbolSourceImpl.java:123) at org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl$SymbolExpansion.valueForSymbol(SymbolSourceImpl.java:99) at org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl.valueForSymbol(SymbolSourceImpl.java:214) at $SymbolSource_130bc880a63.valueForSymbol($SymbolSource_130bc880a63.java) at org.apache.tapestry5.ioc.internal.services.SymbolObjectProvider.provide(SymbolObjectProvider.java:49) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl$1.invoke(MasterObjectProviderImpl.java:48) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl.provide(MasterObjectProviderImpl.java:41) at $MasterObjectProvider_130bc880a5f.provide($MasterObjectProvider_130bc880a5f.java) at org.apache.tapestry5.ioc.internal.RegistryImpl.getObject(RegistryImpl.java:811) at org.apache.tapestry5.ioc.internal.ObjectLocatorImpl.getObject(ObjectLocatorImpl.java:50) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateInjection(InternalUtils.java:263) at org.apache.tapestry5.ioc.internal.util.InternalUtils.access$000(InternalUtils.java:86) at org.apache.tapestry5.ioc.internal.util.InternalUtils$2.invoke(InternalUtils.java:303) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParameters(InternalUtils.java:307) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParametersForMethod(InternalUtils.java:270) at org.apache.tapestry5.ioc.internal.ServiceBuilderMethodInvoker.createObject(ServiceBuilderMethodInvoker.java:56) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29) at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46) at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.obtainObjectFromCreator(JustInTimeObjectCreator.java:68) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.createObject(JustInTimeObjectCreator.java:57) 
    at $Alias_130bc880a60.delegate($Alias_130bc880a60.java)
    at $Alias_130bc880a60.getObjectProvider($Alias_130bc880a60.java)
at org.apache.tapestry5.services.TapestryModule$1.provide(TapestryModule.java:880) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl$1.invoke(MasterObjectProviderImpl.java:48) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl.provide(MasterObjectProviderImpl.java:41) at $MasterObjectProvider_130bc880a5f.provide($MasterObjectProvider_130bc880a5f.java) at org.apache.tapestry5.ioc.internal.RegistryImpl.getObject(RegistryImpl.java:811) at org.apache.tapestry5.ioc.internal.ObjectLocatorImpl.getObject(ObjectLocatorImpl.java:50) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateInjection(InternalUtils.java:263) at org.apache.tapestry5.ioc.internal.util.InternalUtils.access$000(InternalUtils.java:86) at org.apache.tapestry5.ioc.internal.util.InternalUtils$2.invoke(InternalUtils.java:303) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParameters(InternalUtils.java:307) at org.apache.tapestry5.ioc.internal.ModuleImpl.instantiateModuleInstance(ModuleImpl.java:442) at org.apache.tapestry5.ioc.internal.ModuleImpl.access$1200(ModuleImpl.java:61) at org.apache.tapestry5.ioc.internal.ModuleImpl$6$1.invoke(ModuleImpl.java:372) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.ModuleImpl$6.run(ModuleImpl.java:367) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier$2.invoke(ConcurrentBarrier.java:200) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier$2.invoke(ConcurrentBarrier.java:198) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withWrite(ConcurrentBarrier.java:140) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withWrite(ConcurrentBarrier.java:206) at org.apache.tapestry5.ioc.internal.ModuleImpl$7.invoke(ModuleImpl.java:383) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85) at org.apache.tapestry5.ioc.internal.ModuleImpl.getModuleBuilder(ModuleImpl.java:391) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl.getModuleBuilder(ServiceResourcesImpl.java:138) at org.apache.tapestry5.ioc.internal.ServiceBuilderMethodInvoker.createObject(ServiceBuilderMethodInvoker.java:47) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29) at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46) at org.apache.tapestry5.ioc.internal.AdvisorStackBuilder.createObject(AdvisorStackBuilder.java:60) at org.apache.tapestry5.ioc.internal.InterceptorStackBuilder.createObject(InterceptorStackBuilder.java:52) at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.obtainObjectFromCreator(JustInTimeObjectCreator.java:68) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.createObject(JustInTimeObjectCreator.java:57) at $ServletApplicationInitializer_130bc880a5e.delegate($ServletApplicationInitializer_130bc880a5e.java) at $ServletApplicationInitializer_130bc880a5e.initializeApplication($ServletApplicationInitializer_130bc880a5e.java) 
    at org.apache.tapestry5.TapestryFilter.init(TapestryFilter.java:102)
at org.eclipse.jetty.servlet.FilterHolder.doStart(FilterHolder.java:110) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:747) at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:250) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1179) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:598) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:496) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:36) at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:180) at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:481) at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:137) at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:137) at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:50) 
    at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:470)
    at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:382)
    at org.eclipse.jetty.util.Scanner.scan(Scanner.java:339)
    at org.eclipse.jetty.util.Scanner.start(Scanner.java:275)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:114) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:542) at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:214) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) 
    at org.eclipse.jetty.server.Server.doStart(Server.java:227)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1061) 
    at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:994) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.eclipse.jetty.start.Main.invokeMain(Main.java:476)
    at org.eclipse.jetty.start.Main.start(Main.java:618)
    at org.eclipse.jetty.start.Main.parseCommandLine(Main.java:272)
    at org.eclipse.jetty.start.Main.main(Main.java:80)
Caused by:
java.lang.NullPointerException
at tests.mytapestrytest.services.AppModule.contributeTestSymbolProvider(AppModule.java:44) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tapestry5.ioc.internal.ContributionDefImpl.invokeMethod(ContributionDefImpl.java:127) at org.apache.tapestry5.ioc.internal.ContributionDefImpl.contribute(ContributionDefImpl.java:76) at org.apache.tapestry5.ioc.internal.RegistryImpl$8.run(RegistryImpl.java:615) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(OperationTrackerImpl.java:50) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(OperationTrackerImpl.java:48) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.run(OperationTrackerImpl.java:46) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.run(PerThreadOperationTracker.java:56) at org.apache.tapestry5.ioc.internal.RegistryImpl.addToUnorderedConfiguration(RegistryImpl.java:611) at org.apache.tapestry5.ioc.internal.RegistryImpl.getUnorderedConfiguration(RegistryImpl.java:475) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl$1.invoke(ServiceResourcesImpl.java:88) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl$1.invoke(ServiceResourcesImpl.java:86) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl.getUnorderedConfiguration(ServiceResourcesImpl.java:82) at org.apache.tapestry5.ioc.internal.AbstractServiceCreator.getUnorderedConfiguration(AbstractServiceCreator.java:132) at org.apache.tapestry5.ioc.internal.AbstractServiceCreator.access$100(AbstractServiceCreator.java:35) at org.apache.tapestry5.ioc.internal.AbstractServiceCreator$1.findResource(AbstractServiceCreator.java:99) at org.apache.tapestry5.ioc.internal.util.DelegatingInjectionResources.findResource(DelegatingInjectionResources.java:38) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateInjection(InternalUtils.java:254) at org.apache.tapestry5.ioc.internal.util.InternalUtils.access$000(InternalUtils.java:86) at org.apache.tapestry5.ioc.internal.util.InternalUtils$2.invoke(InternalUtils.java:303) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParameters(InternalUtils.java:307) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParametersForMethod(InternalUtils.java:270) at org.apache.tapestry5.ioc.internal.ServiceBuilderMethodInvoker.createObject(ServiceBuilderMethodInvoker.java:56) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29) at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46) at org.apache.tapestry5.ioc.internal.AdvisorStackBuilder.createObject(AdvisorStackBuilder.java:60) at org.apache.tapestry5.ioc.internal.InterceptorStackBuilder.createObject(InterceptorStackBuilder.java:52) at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.obtainObjectFromCreator(JustInTimeObjectCreator.java:68) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.createObject(JustInTimeObjectCreator.java:57) at $SymbolProvider_130bc880a66.delegate($SymbolProvider_130bc880a66.java) at $SymbolProvider_130bc880a66.valueForSymbol($SymbolProvider_130bc880a66.java) at org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl$SymbolExpansion.expandSymbol(SymbolSourceImpl.java:123) at org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl$SymbolExpansion.valueForSymbol(SymbolSourceImpl.java:99) at org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl.valueForSymbol(SymbolSourceImpl.java:214) at $SymbolSource_130bc880a63.valueForSymbol($SymbolSource_130bc880a63.java) at org.apache.tapestry5.ioc.internal.services.SymbolObjectProvider.provide(SymbolObjectProvider.java:49) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl$1.invoke(MasterObjectProviderImpl.java:48) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl.provide(MasterObjectProviderImpl.java:41) at $MasterObjectProvider_130bc880a5f.provide($MasterObjectProvider_130bc880a5f.java) at org.apache.tapestry5.ioc.internal.RegistryImpl.getObject(RegistryImpl.java:811) at org.apache.tapestry5.ioc.internal.ObjectLocatorImpl.getObject(ObjectLocatorImpl.java:50) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateInjection(InternalUtils.java:263) at org.apache.tapestry5.ioc.internal.util.InternalUtils.access$000(InternalUtils.java:86) at org.apache.tapestry5.ioc.internal.util.InternalUtils$2.invoke(InternalUtils.java:303) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParameters(InternalUtils.java:307) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParametersForMethod(InternalUtils.java:270) at org.apache.tapestry5.ioc.internal.ServiceBuilderMethodInvoker.createObject(ServiceBuilderMethodInvoker.java:56) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29) at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46) at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.obtainObjectFromCreator(JustInTimeObjectCreator.java:68) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.createObject(JustInTimeObjectCreator.java:57) 
    at $Alias_130bc880a60.delegate($Alias_130bc880a60.java)
    at $Alias_130bc880a60.getObjectProvider($Alias_130bc880a60.java)
at org.apache.tapestry5.services.TapestryModule$1.provide(TapestryModule.java:880) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl$1.invoke(MasterObjectProviderImpl.java:48) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl.provide(MasterObjectProviderImpl.java:41) at $MasterObjectProvider_130bc880a5f.provide($MasterObjectProvider_130bc880a5f.java) at org.apache.tapestry5.ioc.internal.RegistryImpl.getObject(RegistryImpl.java:811) at org.apache.tapestry5.ioc.internal.ObjectLocatorImpl.getObject(ObjectLocatorImpl.java:50) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateInjection(InternalUtils.java:263) at org.apache.tapestry5.ioc.internal.util.InternalUtils.access$000(InternalUtils.java:86) at org.apache.tapestry5.ioc.internal.util.InternalUtils$2.invoke(InternalUtils.java:303) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.util.InternalUtils.calculateParameters(InternalUtils.java:307) at org.apache.tapestry5.ioc.internal.ModuleImpl.instantiateModuleInstance(ModuleImpl.java:442) at org.apache.tapestry5.ioc.internal.ModuleImpl.access$1200(ModuleImpl.java:61) at org.apache.tapestry5.ioc.internal.ModuleImpl$6$1.invoke(ModuleImpl.java:372) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.ModuleImpl$6.run(ModuleImpl.java:367) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier$2.invoke(ConcurrentBarrier.java:200) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier$2.invoke(ConcurrentBarrier.java:198) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withWrite(ConcurrentBarrier.java:140) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withWrite(ConcurrentBarrier.java:206) at org.apache.tapestry5.ioc.internal.ModuleImpl$7.invoke(ModuleImpl.java:383) at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85) at org.apache.tapestry5.ioc.internal.ModuleImpl.getModuleBuilder(ModuleImpl.java:391) at org.apache.tapestry5.ioc.internal.ServiceResourcesImpl.getModuleBuilder(ServiceResourcesImpl.java:138) at org.apache.tapestry5.ioc.internal.ServiceBuilderMethodInvoker.createObject(ServiceBuilderMethodInvoker.java:47) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.SingletonServiceLifecycle.createService(SingletonServiceLifecycle.java:29) at org.apache.tapestry5.ioc.internal.LifecycleWrappedServiceCreator.createObject(LifecycleWrappedServiceCreator.java:46) at org.apache.tapestry5.ioc.internal.AdvisorStackBuilder.createObject(AdvisorStackBuilder.java:60) at org.apache.tapestry5.ioc.internal.InterceptorStackBuilder.createObject(InterceptorStackBuilder.java:52) at org.apache.tapestry5.ioc.internal.RecursiveServiceCreationCheckWrapper.createObject(RecursiveServiceCreationCheckWrapper.java:60) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator$1.invoke(OperationTrackingObjectCreator.java:45) at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:65) at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:68) at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1063) at org.apache.tapestry5.ioc.internal.OperationTrackingObjectCreator.createObject(OperationTrackingObjectCreator.java:49) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.obtainObjectFromCreator(JustInTimeObjectCreator.java:68) at org.apache.tapestry5.ioc.internal.services.JustInTimeObjectCreator.createObject(JustInTimeObjectCreator.java:57) at $ServletApplicationInitializer_130bc880a5e.delegate($ServletApplicationInitializer_130bc880a5e.java) at $ServletApplicationInitializer_130bc880a5e.initializeApplication($ServletApplicationInitializer_130bc880a5e.java) 
    at org.apache.tapestry5.TapestryFilter.init(TapestryFilter.java:102)
at org.eclipse.jetty.servlet.FilterHolder.doStart(FilterHolder.java:110) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:747) at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:250) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1179) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:598) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:496) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:36) at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:180) at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:481) at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:137) at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:137) at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:50) 
    at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:470)
    at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:382)
    at org.eclipse.jetty.util.Scanner.scan(Scanner.java:339)
    at org.eclipse.jetty.util.Scanner.start(Scanner.java:275)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:114) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:542) at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:214) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) 
    at org.eclipse.jetty.server.Server.doStart(Server.java:227)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55) at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1061) 
    at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:994) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.eclipse.jetty.start.Main.invokeMain(Main.java:476)
    at org.eclipse.jetty.start.Main.start(Main.java:618)
    at org.eclipse.jetty.start.Main.parseCommandLine(Main.java:272)
    at org.eclipse.jetty.start.Main.main(Main.java:80)


Am 23.06.2011 12:32, schrieb Josh Canfield:

Can you provide some more stack trace?

Here is the code from TapestryFilter:

         registry = appInitializer.createRegistry();

         context.setAttribute(REGISTRY_CONTEXT_NAME, registry);

         ServletApplicationInitializer ai =
registry.getService("ServletApplicationInitializer",
                 ServletApplicationInitializer.class);

// Sets request globals
         ai.initializeApplication(filterConfig.getServletContext());

// collects eager load services and creates the underlying objects.
         registry.performRegistryStartup();

Can you create a small example app that reproduces the problem?

On Thu, Jun 23, 2011 at 7:37 AM, Erik Fäßler<erik.faess...@uni-jena.de>  wrote:

  Hi everyone!

I build a web app using T5.2.5 and employing the T5 IoC container.
I have a contribution to a service which gets the ApplicationGlobals service
injected. Everything works fine - until I want to eagerload the service with
the afore mentioned contribution.
When I eagerload the service, sometimes everything is alright. But sometimes
I get a NullPointerException here:

ServletContext context = applicationGlobals.getServletContext();
InputStream is = context.getResourceAsStream("/WEB-INF" +
SemedicoSymbolProvider.CONFIG_FILE_NAME); // Here sometimes null pointer

Thus, the ServletContext is null (I have tested that). I'm not sure how this
works, it seems to me the eager load is so fast sometimes, that the servlet
container (Jetty) has not started its services yet.
In the stack trace there is this snippet:
---------------- SNIP -----------------------
at org.apache.tapestry5.TapestryFilter.init(TapestryFilter.java:102)
    at org.eclipse.jetty.servlet.FilterHolder.doStart(FilterHolder.java:110)
    at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at
org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:747)
    at
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:250)
---------------- SNAP -----------------------

This sounds like it would be tried to initialize the context. Perhaps this
is a concurrency thing, I really don't know. Does anyone of you have some
ideas on how to avoid this error? For me it would suffice if I could delay
the eagerload until a later point where the ServletContext is surely
initialized.
But I wouldn't like to abandon the eager load at all, because then the first
call to my web app takes quite some time (30sec or so). But again, when not
using eager load, no errors are thrown.

Best regards,

    Erik

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