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https://issues.apache.org/jira/browse/CAMEL-24110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24110.
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Resolution: Fixed
> camel-xslt-saxon: saxonReaderProperties null-guard is always true -
> stylesheets parsed by raw unhardened SAXParser, URIResolvers returning
> DOMSource broken
> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-24110
> URL: https://issues.apache.org/jira/browse/CAMEL-24110
> Project: Camel
> Issue Type: Bug
> Components: camel-xslt
> Affects Versions: 4.21.0
> Reporter: Federico Mariani
> Assignee: Claus Ibsen
> Priority: Minor
> Labels: code-review
> Fix For: 4.22.0
>
> Attachments: XsltSaxonUriResolverDomSourceTest.java
>
>
> h3. Problem
> {{XsltSaxonEndpoint}} initializes {{saxonReaderProperties}} to an *empty
> HashMap*, so the guards {{if (this.saxonReaderProperties != null)}} in
> {{loadResource()}} and {{createBuilderForCustomStylesheet()}} - clearly meant
> as "only when the user configured reader properties" - are always true. Every
> stylesheet load is unconditionally re-wrapped by {{createReaderForSource()}}.
> Consequences:
> # A custom {{URIResolver}} returning a {{DOMSource}} (or a {{SAXSource}}
> without reader) gets {{SAXSource.sourceToInputSource(source)}} -> {{null}},
> producing a {{SAXSource}} with a null {{InputSource}} and the endpoint fails
> to start with {{SaxonApiException: I/O error reported by XML parser
> processing null}}. The identical route on plain {{xslt:}} works.
> # Every stylesheet (and every {{allowTemplateFromHeader}} template) is parsed
> through {{SAXParserFactory.newInstance()}} with zero features configured -
> ignoring the hardened parser setup used everywhere else in Camel.
> # In {{loadResource()}} the wrap happens *before* the {{source == null}}
> check, and {{createReaderForSource()}} returns a non-null wrapper (or null on
> parser-creation failure), so the intended {{IOException("Cannot load schema
> resource ...")}} can never fire for a null resolver result.
> h3. Reproducer
> Attached {{XsltSaxonUriResolverDomSourceTest.java}} - a registry-bound
> {{URIResolver}} returning a {{DOMSource}}; the xslt-saxon route fails at
> context startup on current main.
> h3. Fix direction
> Guard with {{!saxonReaderProperties.isEmpty()}}, keep the null-source check
> first, and harden the created XMLReader (secure processing, external entities
> off) since it also parses header-supplied templates when
> {{allowTemplateFromHeader=true}}.
> ----
> _This issue was researched and filed by Claude Code on behalf of [~fmariani]
> (GitHub: Croway), as part of a code review of camel-xslt and
> camel-xslt-saxon. The attached JUnit reproducer fails deterministically on
> current main (4.22.0-SNAPSHOT); place it in
> {{components/camel-xslt-saxon/src/test/java/org/apache/camel/component/xslt/saxon/}}._
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