[JENA-2034] adding GraphNode (N3 formula) to Model (ARQInternalErrorException)

• Type: Question
• Status: Closed
• Priority: Minor
• Resolution: Information Provided
• Affects Version/s: Jena 3.17.0
• Component/s: ARQ, Jena, RDF API

Environment

• Ubuntu 20.04
• Using Eclipse EE
• Project is running a Tomcat 9 server

• Assignee: Unassigned
• Reporter: Calum Mackervoy
• Created: 06/Feb/21 13:56
• Updated: 14/Feb/21 12:02
• Resolved: 06/Feb/21 20:54

Description

I'm attempting to add a Graph node to a Model (N3 formula)

The output should be roughly like the below:
```
<http://localhost:8080/patches/#cf0ba48fa8b0421c8b025c3ea6b41a4f>
a <http://www.w3.org/ns/solid/terms#Patch> ;
<http://www.w3.org/ns/solid/terms#patches>
<http://example.com/#me> ;
<http://www.w3.org/ns/solid/terms#inserts> { http://example.com/#me http://example.com/#property http://example.com/#resource } .
```
Note that the `#inserts` property here is a "GraphNode" or N3 formula, I'm modelling a graph of the triples to write when a `Task` is complete

I tried the code below:
```
Model out = ModelFactory.createDefaultModel();
out.add(endState, SolidTerms.inserts, out.asRDFNode(NodeFactory.createGraphNode(inserts.getGraph())));
```

but this throws `[org.apache.jena.sparql.ARQInternalErrorException: Unknown node type: \{http://example.com/#me @http://example.com/#property http://example.com/#resource}]`

I've tried many other ways of putting the `Graph` in the model with no success, posting this one because it was my first and I think the most rational. I think it's a bug unless Jena just doesn't support the GraphNode type in `RDFNode` ? I spent a few hours searching the documentation and the web before opening this issue

The `@` in the error output puzzled me a bit, but I checked that it's not included in my property definition, it's maybe added in by the `createGraphNode` or the error serialization