JRuby NPE parsing an invalid XML instruction

[bhollis]

Under JRuby 1.7.2, this:

Nokogiri::XML("<? ?>")

Causes:

null:-1:in `scanPIData': java.lang.NullPointerException
    from null:-1:in `scanPIData'
    from null:-1:in `scanPI'
    from null:-1:in `dispatch'
    from null:-1:in `scanDocument'
    from null:-1:in `parse'
    from null:-1:in `parse'
    from null:-1:in `parse'
    from null:-1:in `parse'
    from NokogiriDomParser.java:94:in `parse'
    from XmlDomParserContext.java:249:in `do_parse'
    from XmlDomParserContext.java:236:in `parse'
    from XmlDocument.java:325:in `newFromData'
    from XmlDocument.java:339:in `read_memory'
    from XmlDocument$INVOKER$s$0$0$read_memory.gen:-1:in `call'
    from CachingCallSite.java:296:in `cacheAndCall'
    from CachingCallSite.java:72:in `call'
    from FCallManyArgsNode.java:60:in `interpret'
    from NewlineNode.java:105:in `interpret'
    from BlockNode.java:71:in `interpret'
    from IfNode.java:118:in `interpret'
    from LocalAsgnNode.java:123:in `interpret'
    from NewlineNode.java:105:in `interpret'
    from BlockNode.java:71:in `interpret'
    from ASTInterpreter.java:75:in `INTERPRET_METHOD'
    from InterpretedMethod.java:112:in `call'
    from DefaultMethod.java:154:in `call'
    from CachingCallSite.java:286:in `cacheAndCall'
    from CachingCallSite.java:81:in `callBlock'
    from CachingCallSite.java:85:in `call'
    from CallManyArgsBlockPassNode.java:57:in `interpret'
    from NewlineNode.java:105:in `interpret'
    from ASTInterpreter.java:75:in `INTERPRET_METHOD'
    from InterpretedMethod.java:182:in `call'
    from DefaultMethod.java:188:in `call'
    from CachingCallSite.java:326:in `cacheAndCall'
    from CachingCallSite.java:170:in `call'
    from ./noko2.rb:7:in `__file__'
    from ./noko2.rb:-1:in `load'
    from Ruby.java:810:in `runScript'
    from Ruby.java:803:in `runScript'
    from Ruby.java:674:in `runNormally'
    from Ruby.java:523:in `runFromMain'
    from Main.java:390:in `doRunFromMain'
    from Main.java:279:in `internalRun'
    from Main.java:221:in `run'
    from Main.java:201:in `main'

I know it's not valid XML, but I'd rather get an error or an empty document (like how MRI version does) than an NPE.

[bhollis]

Thanks!