Tag Archives: Neo4J

JRuby + Neo4J Problems

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I have JRuby on Rails app, which is using an ueber JAR to access Neo4J. The Neo4J database is in the rails root directory unter “data/”. By starting the HTTP Server I got today this Exception:

IllegalArgumentException: No index provider 'lucene' found. Maybe the intended provider (or one more of its dependencies) aren't on the classpath or it failed to load.

The problem was in the “data/”. In some way it was corrupt. I am not sure. After I exchanged the “data/” directory with an older version, the HTTP Server started without any problems.

JRuby + Spring + AspectJ + Neo4J

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I am playing around with JRuby and Neo4j as Graph Engine. My set up on the backend side contains a Java Application with Spring Annotations, AspectJ and Neo4J. In the frontend I have a Rails App with JRuby.

Any time I try to access a class that have an annotation like “@NodeEntity”, I get an Exception. It seems that Spring and AspectJ is to much in this chain. I should get rid of Spring and AspectJ.