Jira (PUP-8547) MRI and JRuby Yaml parsers not compliant with spec wrt. errors

Title: Message Title

I believe, the main problem is PuppetServer which runs in JRuby. So, it seems "snakeyaml" should be used internally by "psych" wrapper.

I've tried a quick test of Java version and immediately found that it DOES properly handle invalid documents.

Exception in thread "main" expected '<document start>', but found BlockMappingStart

 in 'reader', line 5, column 1:

    somevar: 3

        at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentStart.produce(ParserImpl.java:225)

        at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:157)

        at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:147)

        at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:108)

        at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:120)

        at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:450)

        at org.yaml.snakeyaml.Yaml.load(Yaml.java:381)

        at LoadFile.main(LoadFile.java:7)

It seems Ruby uses "loadAll()" API, treating the YAML as list of concatenated documents. That's why no error is risen.

Will look further.

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