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egonw / rrdf

R package for handling RDF data.
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Unsupported major.minor version 51.0 #37

Closed rlzijdeman closed 8 years ago

rlzijdeman commented 9 years ago

Hi,

I'm trying to run the examples from the sparql.remote help page, but in both cases I am treated to a warning and get no output: "In .jcall("com/github/egonw/rrdf/RJenaHelper", "Lcom/github/egonw/rrdf/StringMatrix;", : java.lang.UnsupportedClassVersionError: com/github/egonw/rrdf/RJenaHelper : Unsupported major.minor version 51.0"

I'm not sure what that means. Any ideas how I can resolve it?

Best,

Richard

konradzdeb commented 8 years ago

I've experience the same problem when trying to execute load.rdf command. I'm guessing that problem may be concerned with Java versions, as discussed here on StackOverflow.

egonw commented 8 years ago

It practically means that you're using Java6 or older. You need Java7 or better even Java8 (which is also just faster). More info about the major.minor versioning in Java can be found in this StackOverflow post.

egonw commented 8 years ago

I have added a note in the README.md to indicate the Java7 (or higher) requirement.