Error while parsing rnc

[asm0dey]

Hi everybody,

I'm trying to parse opds.rnc, which includes atom.rnc 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 no errors happens.

[laurentschoelens]

Hi @asm0dey

Since you provided the schema you try to generate java classes from, I'll try to provide a PR that fixes the error.

Regards

[asm0dey]

@laurentschoelens thank you very much! The generation of a correct code model from this schema is very interesting thing by itself because of complex hierarchies

[laurentschoelens]

By curiosity : which tool do you use to generate java classes ?

[asm0dey]

Do you mean source code? I actually generate Kotlin with KotlinPoet

[laurentschoelens]

Yes sorry, generate the source code from the rnc schema

[asm0dey]

JavaPoet and KotlinPoet are always my tools of choice for the code generation

[laurentschoelens]

Reproduced
Working on PR 😄