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https://issues.apache.org/jira/browse/FELIX-6791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17993157#comment-17993157
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Jonathan Wright edited comment on FELIX-6791 at 7/3/25 9:15 PM:
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[~paulrutter] - Thank you for picking this up so quickly. I'm unable to test
this as Karaf ships with Pax Web 8.30.0, which is still using
{{{}javax.servlet{}}}. I'm happy to backport your fix to a new 2.0.18 branch
for those limited to 2.0.x due to the move to {{jakarta.servlet}} in 2.1.0.
I have tested Pax Web 8.30.0 by registering multiple instances of the same
{{Servlet}} class by specifying a unique {{osgi.http.whiteboard.servlet.name}}
value for each instance, and it does work. So I'm pretty certain your fix is
correct.
was (Author: JIRAUSER310126):
[~paulrutter] - Thank you for picking this up so quickly. I'm unable to test
this as Karaf ships with Pax Web 8.30.0, which is still using
{{{}javax.servlet{}}}. I'm happy to backport your fix to a new 2.0.18 branch
for those limited to 2.0.x due to the move to {{jakarta.servlet}} in 2.1.0.
I have tested Pax Web 8.30.0 by registering multiple instances of the same
{{Servlet}} class by specifying {{osgi.http.whiteboard.servlet.name}} and it
does work. So I'm pretty certain your fix is correct.
> Only a single format can be allowed when using Pax Web
> ------------------------------------------------------
>
> Key: FELIX-6791
> URL: https://issues.apache.org/jira/browse/FELIX-6791
> Project: Felix
> Issue Type: Bug
> Components: Health Checks
> Affects Versions: healthcheck.core 2.0.14, healthcheck.core 2.3.0
> Environment: org.apache.felix.healthcheck.core 2.0.14
> org.ops4j.pax.web.pax-web-spi 8.30.0
> Reporter: Jonathan Wright
> Assignee: Paul Rütter
> Priority: Minor
> Attachments: org.apache.felix.healthcheck.core-2.3.1-SNAPSHOT.jar,
> stacktrace.txt
>
>
> {{HealthCheckExecutorServlet}} registers a new instance of
> {{HealthCheckExecutorServlet$ProxyServlet}} for each allowed format. However,
> it does not supply a unique name for each instance. This violates [Section
> 102.2|https://docs.osgi.org/specification/osgi.cmpn/8.0.0/service.http.html#i1223311]
> of the OSGi Http Service Specification, which includes the following
> statement:
> {quote}All {{Servlet}} objects and resource registrations share the same
> name-space. If an attempt is made to register a resource or {{Servlet}}
> object under the same name as a currently registered resource or {{Servlet}}
> object, a {{NamespaceException}} is thrown.
> {quote}
> Pax Web enforces the above mentioned requirement (see [^stacktrace.txt]). As
> a result, only one instance of {{HealthCheckExecutorServlet$ProxyServlet}} is
> registered. To prevent {{Servlet}} registration errors when using Pax Web,
> you have to set the {{allowed.formats}} configuration property to a single
> value, e.g. {{{}allowed.formats=["json"]{}}}.
> You cannot specify a name when registering a {{Servlet}} via the
> {{org.osgi.service.http.HttpService}} API, so the 2.0.14 version of
> {{HealthCheckExecutorServlet}} would need to be updated to use the Whiteboard
> Pattern. The 2.1.0 version, which does use the Whiteboard Pattern, simply
> needs to specify a unique {{osgi.http.whiteboard.servlet.name}} property
> value for each {{HealthCheckExecutorServlet$ProxyServlet}} instance.
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