Needing help with neo4jHaGraph

[Richard Andrews]

Hello,

We have a java app in jar format using tinkerpop to an embedded neo4j instance.  We're trying to setup multiple instances of the java app with db replication but our app is throwing the following exception:

Exception in thread "main" java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph].

        at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:48)

        at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:62)

Caused by: java.lang.reflect.InvocationTargetException

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

        at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:41)

        ... 2 more

Caused by: java.lang.IllegalArgumentException: Missing mandatory setting 'ha.server_id'

        at org.neo4j.helpers.Settings$DefaultSetting.apply(Settings.java:759)

        at org.neo4j.helpers.Settings$DefaultSetting.apply(Settings.java:702)

        at org.neo4j.kernel.configuration.ConfigurationValidator.validate(ConfigurationValidator.java:50)

        at org.neo4j.kernel.configuration.Config.applyChanges(Config.java:121)

        at org.neo4j.kernel.configuration.Config.<init>(Config.java:89)

        at org.neo4j.kernel.InternalAbstractGraphDatabase.<init>(InternalAbstractGraphDatabase.java:219)

        at org.neo4j.kernel.ha.HighlyAvailableGraphDatabase.<init>(HighlyAvailableGraphDatabase.java:149)

        at org.neo4j.graphdb.factory.HighlyAvailableGraphDatabaseFactory$1.newDatabase(HighlyAvailableGraphDatabaseFactory.java:47)

        at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:207)

        at com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph.<init>(Neo4jHaGraph.java:22)

        at com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph.<init>(Neo4jHaGraph.java:30)

Despite the following config parameters.

blueprints.graph=com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph

blueprints.neo4jha.directory=/data/neo/

blueprints.neo4jha.config.ha.server_id=1

blueprints.neo4jha.config.ha.server=xxx.xxx.xxx.xxx:6001

blueprints.neo4jha.config.ha.cluster_server=xxx.xxx.xxx.xxx:5001

blueprints.neo4jha.config.ha.initial_hosts=xxx.xxx.xxx.xxx:5001,xxx.xxx.xxx.xxx:5002

I'm stuck at the fact the exception is allegedly caused by a Missing ha.server_id parameter, yet it is there in my config.  Any ideas what I might be doing wrong here?

[Stephen Mallette]

There was a mistype in the documentation.  I've fixed that now.  Please try:

blueprints.neo4jha.conf

as your configuration prefix instead of what you are using now ("blueprints.neo4jha.config").  

Stephen

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[Richard Andrews]

Hi Stephen,

Thank you for getting back to me on that one.  That has moved us past that exception onto another one.   Hopefully you have some insight into this one as well:

Collabinate Server Version 0.2.0

Exception in thread "main" java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph].

        at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:48)

        at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:62)

Caused by: java.lang.reflect.InvocationTargetException

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

        at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:41)

        ... 2 more

Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String

        at org.neo4j.graphdb.factory.GraphDatabaseBuilder.setConfig(GraphDatabaseBuilder.java:134)

        at com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph.<init>(Neo4jHaGraph.java:22)

        at com.tinkerpop.blueprints.impls.neo4j.Neo4jHaGraph.<init>(Neo4jHaGraph.java:30)

        ... 7 more

[Stephen Mallette]

Looks like the apache ConfigurationConverter is getting fancy with how it is treating the conversion of your comma separated lists.  

gremlin> c = new BaseConfiguration()

==>org.apache.commons.configuration.BaseConfiguration@171183d8

gremlin> c.setProperty("test","1,2,3,4")

==>null

gremlin> import org.apache.commons.configuration.ConfigurationConverter

==>import com.tinkerpop.gremlin.*

==>import com.tinkerpop.gremlin.java.*

==>import com.tinkerpop.gremlin.pipes.filter.*

==>import com.tinkerpop.gremlin.pipes.sideeffect.*

...

==>import org.apache.commons.configuration.ConfigurationConverter

gremlin> m = ConfigurationConverter.getMap(c)                          

==>org.apache.commons.configuration.ConfigurationMap$ConfigurationSet$Entry@48cb68d8

gremlin> m.values()

==>[1, 2, 3, 4]

gremlin> m.collect{k,v->v.class}

==>class java.util.ArrayList

Since Neo4jHaGraph just wants flat strings we need to make this conversion some other way.

https://github.com/tinkerpop/blueprints/commit/69661db5e857f94dfaa61f7d72669c472c252c2d

The above is deployed to sonatype snapshot repo for 2.5.0-SNAPSHOT.  Until 2.5.0 is released, the workaround would be to to instantiate Neo4jHaGraph directly with a constructed Map and take GraphFactory out of the picture.  Sorry for the inconvenience.  Didn't test well enough around GraphFactory in relation to Neo4jHA.

Stephen