neo4j-memorydb

A repackaging of the in-memory database classes from Neo4j. This avoids the need to depend on the test artifacts from the Neo4j project.

Setup

Gradle

dependencies {
    compile group: 'com.github.jasoma', name: 'neo4j-memorydb', version: neoVersion
}

Maven

<dependency> 
   <groupId>com.github.jasoma</groupId>
   <artifactId>neo4j-memorydb</artifactId>   
   <version>${neoVersion}</version>
</dependency>

Usage

As this is just a repackaging all examples from the main project remain valid, simply use the alternative dependencies shown above.

Usage and examples from the main project can be found here: http://neo4j.com/docs/stable/tutorials-java-unit-testing.html

Gotchas

Although not unique to the in-memory database two errors are common if using the in-memory database for testing but a remote server in production.

1. org.neo4j.kernel.impl.util.UnsatisfiedDependencyException: No dependency satisfies type class org.neo4j.kernel.api.index.SchemaIndexProvider
2. java.lang.UnsupportedOperationException: No query engine installed.

Both of these are due to neo4j looking up components at runtime. Both can be solved by adding additional dependencies:

dependencies {
    // adds an index provider for error [1]
    compile group: 'org.neo4j', name: 'neo4j-lucene-index', version: neoVersion
    // adds a query engine for error [2]
    compile group: 'org.neo4j', name: 'neo4j-cypher', version: neoVersion
}