Explanation of Error: db fails to start with Caused by: org.neo4j.token.api.NonUniqueTokenException: The PropertyKey NamedToken
When attempting to start Neo4j and one is running a Neo4j 4.0.x release and where
x is ⇐2 the following error may be
encountered and logged in
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.internal.recordstorage.RecordStorageEngine$2@783ae61f' failed to initialize. Please see the attached cause exception "The PropertyKey NamedToken[name:prop1, id:321, internal:false] is not unique, it existed as null.". at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:426) at org.neo4j.kernel.lifecycle.LifeSupport.init(LifeSupport.java:66) at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:102) at org.neo4j.kernel.database.Database.start(Database.java:462) ... 13 more Caused by: org.neo4j.token.api.NonUniqueTokenException: The PropertyKey NamedToken[name:prop1, id:321, internal:false] is not unique, it existed as null.
This error has only been reported if your environment was previously on a Neo4j 3.5.x release and then later upgraded to 4.0.x, where
This error is addressed in Neo4j 4.0.3 forward.
If you have encountered this error the workaround is to utilize neo4j-admin copy
which is an offline activity and will read a database and create a new copy of the database without the errors in the underlying
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