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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