[jaxb-impl-dev] Error while parsing rnc

[Pasha Finkelshteyn <me@xxxxxxxxxxxx>]

Hi everybody,

I'm not sure where to report issues — the link on the site leads 
nowhere, so I have to ask here and hope that somebody will guide me to 
the correct solution.

I'm trying to parse opds.rnc[1], which includes atom.rnc[2] with 
ModelLoader.load from `com.sun.xml.bind:jaxb-xjc:4.0.3`

I've got a following exception:

```
Exception in thread "main" java.lang.NullPointerException: Cannot invoke 
"com.sun.tools.rngom.ast.builder.CommentList.addComment(String, 
com.sun.tools.rngom.ast.om.Location)" because "comments" is null
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.getComments(CompactSyntax.java:330)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.noteTopLevelComments(CompactSyntax.java:294)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.NamespaceDecl(CompactSyntax.java:789)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.Preamble(CompactSyntax.java:770)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.IncludedGrammar(CompactSyntax.java:714)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.parseInclude(CompactSyntax.java:150)
    at 
com.sun.tools.rngom.parse.compact.CompactParseable.parseInclude(CompactParseable.java:63)
    at 
com.sun.tools.rngom.digested.IncludeImpl.endInclude(IncludeImpl.java:59)
    at 
com.sun.tools.rngom.parse.host.IncludeHost.endInclude(IncludeHost.java:52)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.Include(CompactSyntax.java:1663)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.GrammarComponent(CompactSyntax.java:1563)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.GrammarBody(CompactSyntax.java:1546)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.TopLevelGrammar(CompactSyntax.java:747)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.Input(CompactSyntax.java:442)
    at 
com.sun.tools.rngom.parse.compact.CompactSyntax.parse(CompactSyntax.java:135)
    at 
com.sun.tools.rngom.parse.compact.CompactParseable.parse(CompactParseable.java:55)
    at com.sun.tools.xjc.ModelLoader.loadRELAXNG(ModelLoader.java:580)
    at 
com.sun.tools.xjc.ModelLoader.loadRELAXNGCompact(ModelLoader.java:568)
    at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:134)
    at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:88)
    at 
org.redundent.kotlin.xml.gen.DslGenerator.generate(DslGenerator.kt:55)
    at org.redundent.kotlin.xml.gen.DslGeneratorKt.main(DslGenerator.kt:23)
```

Indeed, sometimes the following lines:

```
          if (comments == null)
            comments = sb.makeCommentList();
```
returns the `null` comments. It seems to me that it happens when 
SchemaBuilder contains a `[#document: null]`.

It seems that it happens when `CompactSyntax` handles `include`. This 
statement is supported by the fact that when I parse just atom.rnc[2] no 
errors happens.

What is the best way to report this issue?

[1] https://github.com/opds-community/specs/blob/master/schema/1.2/opds.rnc
[2] https://gist.github.com/tommorris/3725394#file-atom-rnc

--
Pasha Finkelshteyn
Developer Advocate @ JetBrains