[jira] [Created] (CXF-8750) Swagger UI not working in Karaf 4.4.0 due to a double slash

["Aleksy Wróblewski (Jira)" <ji...@apache.org>]

Aleksy Wróblewski created CXF-8750:
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             Summary: Swagger UI not working in Karaf 4.4.0 due to a double slash
                 Key: CXF-8750
                 URL: https://issues.apache.org/jira/browse/CXF-8750
             Project: CXF
          Issue Type: Bug
          Components: JAX-RS
    Affects Versions: 3.5.3
         Environment: Karaf 4.4.0

Apache CXF 3.5.3
            Reporter: Aleksy Wróblewski


Hello,

we've been using Apache CXF for the REST API in our OSGi/Karaf project, deploying it via the [cxf feature|https://github.com/apache/cxf/blob/main/osgi/karaf/features/src/main/resources/features.xml] together with the webjars bundle for Swagger UI as described [here|https://cxf.apache.org/docs/openapifeature.html]. It was working fine, however at some point (I think when migrating to a newer Karaf version), the UI stopped working.

I investigated this a little and it turns out that this is because of a double slash when locating the webjars resource via [OsgiSwaggerUiResolver|https://github.com/apache/cxf/blob/main/rt/rs/description-swagger-ui/src/main/java/org/apache/cxf/jaxrs/swagger/ui/OsgiSwaggerUiResolver.java]:
{code:java}
    private String getSwaggerUiRoot(Bundle b, String swaggerUiVersion) {
        if (swaggerUiVersion == null) { 
            swaggerUiVersion = b.getVersion().toString();
        }
        URL entry = b.getEntry(SwaggerUiResolver.UI_RESOURCES_ROOT_START + swaggerUiVersion);
        if (entry != null) {
            return entry.toString() + "/";
        }
        return null;
    }
{code}
If the _entry_ returned from _Bundle.getEntry_ already contains a trailing slash, adding another one in the if block stops the webjars resources from being accessed because the URL is then incorrect. I think this depends on the OSGi implementation, whether it returns the entry with the trailing slash or not. Apache Felix in Karaf 4.4.0 returns it.

In our case, what was returned from the method was:

_bundle://c51ac79e-eaa5-4d6a-9456-35ff46a4fc9b_226.0:0/META-INF/resources/webjars/swagger-ui/4.13.2//_

while it should be:
_bundle://c51ac79e-eaa5-4d6a-9456-35ff46a4fc9b_226.0:0/META-INF/resources/webjars/swagger-ui/4.13.2/_


With the double slash, SwaggerUiService gets IOExceptions when trying to read the resources (index.html, swagger js/css files).

I tested and without the extra slash it works fine again, will submit a pull request shortly.



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