v1.5.6 breaks Builder namespaced attributes

[avinmathew]

I found that upgrading to 1.5.6 breaks functionality that existed in 1.5.5 around building namespaced attributes.

Test code:

Nokogiri::XML::Builder.new { |xml|
  xml.root('xmlns:a' => 'a') {
    xml.element('a:b' => 'a:c')
  }
}

Error:

Java::JavaLang::ClassCastException: org.jruby.RubyNil cannot be cast to nokogiri.XmlNode
    from nokogiri.XmlNode.findNamespaceHref(XmlNode.java:1215)
    from nokogiri.XmlNode.set(XmlNode.java:1192)
    from nokogiri.XmlNode$INVOKER$i$2$0$set.call(XmlNode$INVOKER$i$2$0$set.gen)
    from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:202)
    from org.jruby.ast.FCallTwoArgNode.interpret(FCallTwoArgNode.java:38)
    from org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
    from org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
    from org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
    from org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:204)
    from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:202)
    from org.jruby.ast.AttrAssignTwoArgNode.interpret(AttrAssignTwoArgNode.java:42)
    from org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
    from org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
    from org.jruby.evaluator.ASTInterpreter.INTERPRET_BLOCK(ASTInterpreter.java:112)
    from org.jruby.runtime.Interpreted19Block.evalBlockBody(Interpreted19Block.java:209)
    from org.jruby.runtime.Interpreted19Block.yield(Interpreted19Block.java:160)
...

Versions:

> java -version
java version "1.7.0_05"
Java(TM) SE Runtime Environment (build 1.7.0_05-b06)
Java HotSpot(TM) Server VM (build 23.1-b03, mixed mode)

> jruby -v
jruby 1.7.1 (1.9.3p327) 2012-12-03 30a153b on Java HotSpot(TM) Server VM 1.7.0_05-b06 [linux-i386]

[jmcnevin]

I'm encountering this as well.

[flavorjones]

@jvshahid or @yokolet - can you take a look?

[flavorjones]

This has been fixed at some point in the intervening years. I'm using:

# Nokogiri (1.10.0)
    ---
    warnings: []
    nokogiri: 1.10.0
    ruby:
      version: 2.5.0
      platform: java
      description: jruby 9.2.5.0 (2.5.0) 2018-12-06 6d5a228 OpenJDK 64-Bit Server VM 10.0.2+13-Ubuntu-1ubuntu0.18.04.4
        on 10.0.2+13-Ubuntu-1ubuntu0.18.04.4 [linux-x86_64]
      engine: jruby
      jruby: 9.2.5.0
    xerces: Xerces-J 2.12.0
    nekohtml: NekoHTML 1.9.21

[flavorjones]

Clarification: this was fixed by #846 in v1.5.7