[MNG-7662] Proxy session scoped components so that they can be injected into singletons beans

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-9
• Assignee: Guillaume Nodet
• Reporter: Christoph Läubrich
• Created: 04/Jan/23 14:31
• Updated: 08/Dec/23 16:42
• Resolved: 09/Nov/23 13:34

Description

The SessionScope will now create proxies to wrap beans when there's a need to inject a bean while the session scope is not yet available. Such proxies require the use of a Typed annotation, either the org.eclipse.sisu.Typed or javax.enterprise.inject.Typed annotation, to be put on the bean that requires to be wrapped by a proxy.

    @Named
    static class MySingletonBean {
        @Inject
        BeanItf myBean;
    }

    interface BeanItf {
        Session getSession();
    }

    @SessionScoped
    @Typed
    static class MySessionScopedBean implements BeanItf {
        @Inject
        Session session;

        public Session getSession() {
            return session;
        }
    }

=======

Original problem:

Currently DefaultMaven gets the Graphbuilder injected as a strict requirement at a very early stage. This leads to the problem, that a GraphBuilder implementation can not use any SessionScoped Components (because the session scope is not setup yet).

The error then is

1) Error in custom provider, com.google.inject.OutOfScopeException: Cannot access Key[type=org.apache.maven.execution.MavenSession, annotation=[none]] outside of a scoping block
  at org.apache.maven.session.scope.internal.SessionScopeModule.configure(SessionScopeModule.java:64) (via modules: org.eclipse.sisu.wire.WireModule -> org.apache.maven.session.scope.internal.SessionScopeModule)
  while locating org.apache.maven.execution.MavenSession
    for the 1st parameter of org.eclipse.tycho.helper.PluginRealmHelper.<init>(Unknown Source)
  at ClassRealm[coreExtension>org.eclipse.tycho:tycho-build:${tycho-version}, parent: ClassRealm[plexus.core, parent: null]] (via modules: org.eclipse.sisu.wire.WireModule -> org.eclipse.sisu.plexus.PlexusBindingModule)
  while locating org.eclipse.tycho.helper.PluginRealmHelper
  at ClassRealm[coreExtension>org.eclipse.tycho:tycho-build:${tycho-version}, parent: ClassRealm[plexus.core, parent: null]] (via modules: org.eclipse.sisu.wire.WireModule -> org.eclipse.sisu.plexus.PlexusBindingModule)
  while locating org.eclipse.tycho.p2maven.InstallableUnitGenerator
  at ClassRealm[coreExtension>org.eclipse.tycho:tycho-build:${tycho-version}, parent: ClassRealm[plexus.core, parent: null]] (via modules: org.eclipse.sisu.wire.WireModule -> org.eclipse.sisu.plexus.PlexusBindingModule)
  while locating org.eclipse.tycho.p2maven.MavenProjectDependencyProcessor
  while locating org.eclipse.tycho.build.TychoGraphBuilder

Issue Links

• links to: GitHub Pull Request #948
• links to: GitHub Pull Request #950