[KARAF-6076] Blueprint loading fails with Saxon or Xalan

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.2.2
• Fix Version/s: 4.2.3
• Component/s: karaf
• Labels: blueprint saxon xslt
• Assignee: Jean-Baptiste Onofré
• Reporter: Jean-Baptiste Onofré
• Created: 08/Jan/19 05:11
• Updated: 11/Jan/19 05:13
• Resolved: 11/Jan/19 05:13

Description

Reported on the mailing list:

I use Karaf as a runtime to host my Apache Camel routes. They are
mostly plain blueprint .xmls that are installed and deployed with the
blueprint handler.  I make heavy use of xsl tranformations and have in
the past used Xalan but am moving to Saxon for xslt/xpath 2.0.

On 4.2.1 I don't have any issues installing and using either Xalan or
Saxon bundles, but on 4.2.2, once either are installed I can no longer
install through blueprint. It looks to be the result of the change for
"Set the secure processing feature on TransformerFactory instances" in
XmlUtils in commit de4c413925379913ffb3bf96ead7edc2dba98d4b. That
commit sets XMLConstants.ACCESS_EXTERNAL_DTD and neither Xalan nor
Saxon support that property. From what I've read searching for that
error I believe external DTD isn't in the purview of transformation
but in the document parser.

Note that it is after a restart of Karaf after installing Saxon that I
get the exception when trying to install another blueprint bundle. I
believe a transfomer is already created from the default
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImp.

Has anyone else seen this?

Thanks.
-John


2018-12-31T16:17:31,853 | ERROR |
fileinstall-/opt/sgscamel/karaf/apache-karaf-4.2.2/deploy |
BlueprintURLHandler              | 63 -
org.apache.karaf.deployer.blueprint - 4.2.2 | Error opening blueprint
xml url
java.lang.IllegalArgumentException: Unknown configuration property
http://javax.xml.XMLConstants/property/accessExternalDTD
        at net.sf.saxon.Configuration.setConfigurationProperty(Configuration.java:4644)
~[?:?]
        at net.sf.saxon.s9api.Processor.setConfigurationProperty(Processor.java:352)
~[?:?]
        at net.sf.saxon.jaxp.SaxonTransformerFactory.setAttribute(SaxonTransformerFactory.java:306)
~[?:?]
        at org.apache.karaf.util.XmlUtils.transformer(XmlUtils.java:154)
~[63:org.apache.karaf.deployer.blueprint:4.2.2]
        at org.apache.karaf.util.XmlUtils.transform(XmlUtils.java:96)
~[63:org.apache.karaf.deployer.blueprint:4.2.2]
        at org.apache.karaf.deployer.blueprint.BlueprintTransformer.analyze(BlueprintTransformer.java:129)
~[63:org.apache.karaf.deployer.blueprint:4.2.2]
        at org.apache.karaf.deployer.blueprint.BlueprintTransformer.transform(BlueprintTransformer.java:71)
~[63:org.apache.karaf.deployer.blueprint:4.2.2]
        at org.apache.karaf.deployer.blueprint.BlueprintURLHandler$Connection.getInputStream(BlueprintURLHandler.java:73)
[63:org.apache.karaf.deployer.blueprint:4.2.2]
        at java.net.URL.openStream(URL.java:1045) [?:?]
        at org.apache.felix.fileinstall.internal.DirectoryWatcher.install(DirectoryWatcher.java:962)
[10:org.apache.felix.fileinstall:3.6.4]
        at org.apache.felix.fileinstall.internal.DirectoryWatcher.install(DirectoryWatcher.java:884)
[10:org.apache.felix.fileinstall:3.6.4]
        at org.apache.felix.fileinstall.internal.DirectoryWatcher.doProcess(DirectoryWatcher.java:489)
[10:org.apache.felix.fileinstall:3.6.4]
        at org.apache.felix.fileinstall.internal.DirectoryWatcher.process(DirectoryWatcher.java:365)
[10:org.apache.felix.fileinstall:3.6.4]
        at org.apache.felix.fileinstall.internal.DirectoryWatcher.run(DirectoryWatcher.java:316)
[10:org.apache.felix.fileinstall:3.6.4]

Issue Links

• links to: GitHub Pull Request #715