dkuppitz / sparql-gremlin Goto Github PK

Hi,

I try to use this library. It would be great for my project if it works :)

My running env: Ubuntu 16.04, Java: openjdk version "1.8.0_111"
I succeeded at building the proejct by "mvn install".
However when I do "./bin/sparql-gremlin.sh -f example.sparql", it gives the following error:
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.5.0:java (default-cli) on project sparql-gremlin: An exception occured while executing the Java class. null: InvocationTargetException: Unexpected predicate: http://www.w3.org/1999/02/22-rdf-syntax-ns#type -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Can I get some help on this error?

Thanks!

running gremlin-console-3.1.0-incubating
on ububtu 14 java 1.8

gremlin> :install com.datastax sparql-gremlin 0.1
==>Error grabbing Grapes -- [unresolved dependency: com.datastax#sparql-gremlin;0.1: not found]

Sorry just a beginner in this . So lot of confusion .

Hi,

I'm interested to make some queries from SPARQL and translate it to gremlin.
So I'm trying to compile sparql-gremlin using eclipse (after mvn eclipse:eclipse) and I got this exception.

Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method reduce(GraphTraversal<capture#25-of ?,capture#26-of ?>, BinaryOperator<GraphTraversal<capture#25-of ?,capture#26-of ?>>) in the type Stream<GraphTraversal<capture#25-of ?,capture#26-of ?>> is not applicable for the arguments (GraphTraversal<Vertex,capture#33-of ?>, BinaryOperator<GraphTraversal<capture#25-of ?,capture#26-of ?>>) at com.datastax.sparql.gremlin.SparqlToGremlinCompiler.visit(SparqlToGremlinCompiler.java:122) at org.apache.jena.sparql.algebra.op.OpFilter.visit(OpFilter.java:103) at org.apache.jena.sparql.algebra.OpWalker$WalkerVisitor.visit1(OpWalker.java:85) at org.apache.jena.sparql.algebra.OpWalker$WalkerVisitor.visitFilter(OpWalker.java:91) at org.apache.jena.sparql.algebra.OpVisitorByType.visit(OpVisitorByType.java:112) at org.apache.jena.sparql.algebra.op.OpFilter.visit(OpFilter.java:103) at org.apache.jena.sparql.algebra.OpWalker$WalkerVisitor.visit1(OpWalker.java:83) at org.apache.jena.sparql.algebra.OpVisitorByType.visitModifer(OpVisitorByType.java:44) at org.apache.jena.sparql.algebra.OpVisitorByType.visit(OpVisitorByType.java:160) at org.apache.jena.sparql.algebra.op.OpProject.visit(OpProject.java:47) at org.apache.jena.sparql.algebra.OpWalker.walk(OpWalker.java:43) at org.apache.jena.sparql.algebra.OpWalker.walk(OpWalker.java:33) at com.datastax.sparql.gremlin.SparqlToGremlinCompiler.convertToGremlinTraversal(SparqlToGremlinCompiler.java:59) at com.datastax.sparql.gremlin.SparqlToGremlinCompiler.convertToGremlinTraversal(SparqlToGremlinCompiler.java:96) at com.datastax.sparql.gremlin.SparqlToGremlinCompiler.convertToGremlinTraversal(SparqlToGremlinCompiler.java:100) at com.datastax.sparql.ConsoleCompiler.main(ConsoleCompiler.java:105)
And I am using OS X 10.12.1

My version of java is
java version "1.8.0_101" Java(TM) SE Runtime Environment (build 1.8.0_101-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

Can someone give a little help to get this running please?

Cheers!

https://github.com/dkuppitz/sparql-gremlin

These are valid property names. Provide another selector for the tokens, like:

SELECT ?id ?label
 WHERE { ?element t:id ?id . ?element t:label ?label }

I don't know if this will break the SPARQL specification, but it would be nice to be able to do:

SELECT ?x WHERE {
  1 e:knows ?x
}

That is 1 is v[1]. This this makes it REALLY nice for RDF-based graph systems that support the Gremlin virtual machine as its just a URI.

SELECT ?x WHERE {
  http://blah#1 e:knows ?x
}

https://github.com/dkuppitz/sparql-gremlin/blob/master/src/main/java/com/datastax/sparql/gremlin/plugin/SparqlRemoteAcceptor.java#L49-L53

Currently, it looks like SPARQL-Gremlin only works for OLTP.

Hello,

What is the status of this project?

Best