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https://issues.apache.org/jira/browse/FELIX-6015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16737389#comment-16737389
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Cristiano Gavião commented on FELIX-6015:
-----------------------------------------
Ah, I understood better your question.
In the snapshot version that I got the error, I have informed the type
attribute "osgi.fragment":
{noformat}
{
"symbolicName": "org.eclipse.equinox.region",
"type": "osgi.fragment",
"version": "1.4.300.v20181116-1551"
},
{noformat}
> IndexOutOfBoundsException due a missing HostNamespace.HOST_NAMESPACE
> --------------------------------------------------------------------
>
> Key: FELIX-6015
> URL: https://issues.apache.org/jira/browse/FELIX-6015
> Project: Felix
> Issue Type: Bug
> Components: Resolver
> Affects Versions: resolver-1.16.0
> Reporter: Cristiano Gavião
> Priority: Major
>
> When creating a custom ResolveContext we need to build a collection of
> mandatory resources using the method getMandatoryResources().
> Normally we will create such collection using a custom built Resource
> containing only a IdentityNamespace.IDENTITY_NAMESPACE capability, because it
> is enough in order to search for more details of such resource in the
> installed bundles/fragments or in the registered bundle repositories inside
> the findProviders() method.
> The error that I'm getting is due the fact that the resolver, most precisely,
> the Candidates class is using getMandatoryResources() after the
> getInitialCandidates(session) been executed and inferring that it has a
> information about fragments that it doesn't have.
> {code:java}
> public Map<Resource, Resource> getRootHosts()
> {
> Map<Resource, Resource> hosts = new LinkedHashMap<Resource,
> Resource>();
> for (Resource res : *m_session.getMandatoryResources()*)
> {
> addHost(res, hosts);
> }
> for (Resource res : m_session.getOptionalResources())
> {
> if (isPopulated(res)) {
> addHost(res, hosts);
> }
> }
> return hosts;
> }
> {code}
> {code:java}
> private void addHost(Resource res, Map<Resource, Resource> hosts) {
> if (res instanceof WrappedResource)
> {
> res = ((WrappedResource) res).getDeclaredResource();
> }
> if (!Util.isFragment(res))
> {
> hosts.put(res, getWrappedHost(res));
> } else {
> // The error is happening here:
> *Requirement hostReq =
> res.getRequirements(HostNamespace.HOST_NAMESPACE).get(0);*
> Capability hostCap = getFirstCandidate(hostReq);
> // If the resource is an already resolved fragment and can not
> // be attached to new hosts, there will be no matching host,
> // so ignore this resource
> if (hostCap != null) {
> res = getWrappedHost(hostCap.getResource());
> if (res instanceof WrappedResource) {
> hosts.put(((WrappedResource) res).getDeclaredResource(),
> res);
> }
> }
> }
> }
> {code}
> Wouldn't be possible to use the processed initial candidates resources
> instead ?
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