Titan's IllegalArgumentException on Graph creation

I'm getting an initialization error when I try to instantiate my graph in blueprints. Here's the code that I'm using to create a new graph:

String path = "conf/titan-cassandra-" + System.getProperty("env") + ".properties";
Graph graph = TitanFactory.open(path);

The system property is being set and the file exists. The error is being thrown in TitanFactory:

final Pattern p = Pattern.compile("(" + 
Pattern.quote(GraphDatabaseConfiguration.STORAGE_NS.getName()) + "\\..*" + "(" + 
Pattern.quote(GraphDatabaseConfiguration.STORAGE_DIRECTORY.getName()) + "|" + 
Pattern.quote(GraphDatabaseConfiguration.STORAGE_CONF_FILE.getName()) + ")" + "|" + 
Pattern.quote(GraphDatabaseConfiguration.INDEX_NS.getName()) + "\\..*" + "(" + 
Pattern.quote(GraphDatabaseConfiguration.INDEX_DIRECTORY.getName()) + "|" + 
Pattern.quote(GraphDatabaseConfiguration.INDEX_CONF_FILE.getName()) + ")" + ")");

Evaluating the expression GraphDatabaseConfiguration.STORAGE_NS yields 'null'. Why might this be?

Edit:

I'm including the stack trace as well

Exception in thread "main" java.lang.NoSuchMethodError: org.apache.commons.lang.StringUtils.containsAny(Ljava/lang/String;[C)Z
    at com.thinkaurelius.titan.diskstorage.configuration.ConfigElement.<init>(ConfigElement.java:26)
    at com.thinkaurelius.titan.diskstorage.configuration.ConfigNamespace.<init>(ConfigNamespace.java:19)
    at com.thinkaurelius.titan.diskstorage.configuration.ConfigNamespace.<init>(ConfigNamespace.java:24)
    at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.<clinit>(GraphDatabaseConfiguration.java:81)
    at com.thinkaurelius.titan.core.TitanFactory.getLocalConfiguration(TitanFactory.java:240)
    at com.thinkaurelius.titan.core.TitanFactory.getLocalConfiguration(TitanFactory.java:170)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:61)
    at io.fama.api.service.GraphHolder.populateGraph(GraphHolder.java:28)
    at io.fama.api.service.GraphHolder.graph(GraphHolder.java:21)
    at io.fama.api.DebugTests.main(DebugTests.java:7)

When maven runs the test it throws a different error. This one looks like it's related to dependencies.

You didn't include the stack trace, but it is easily reproducible from the Gremlin shell. When running gremlin.sh, it is usually best to run it from the $TITAN_HOME directory, not $TITAN_HOME/bin.

gremlin> graph = TitanFactory.open('conf/titan-cassandra-test.properties')
Backend shorthand unknown: conf/titan-cassandra-test.properties
Display stack trace? [yN] y
java.lang.IllegalArgumentException: Backend shorthand unknown: conf/titan-cassandra-test.properties
    at com.google.common.base.Preconditions.checkArgument(Preconditions.java:120)
    at com.thinkaurelius.titan.core.TitanFactory.getLocalConfiguration(TitanFactory.java:175)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:61)

You need to watch out for the relative path. Most likely you are running the program from a different directory such that the relative path to the properties file does not resolve. Either run the program from the correct parent directory or use an absolute path.