Neo4j Import: java.lang.IllegalStateException: Mixing specified and unspecified group belongings in a single import isn’t supported
I’ve been working with the Neo4j Import Tool recently after a bit of a break and ran into an interesting error message that I initially didn’t understand.
I had some CSV files containing nodes that I wanted to import into Neo4j. Their contents look like this:
$ cat people_header.csv name:ID(Person) $ cat people.csv "Mark" "Michael" "Ryan" "Will" "Jennifer" "Karin" $ cat companies_header.csv name:ID(Company) $ cat companies.csv "Neo4j"
I find it easier to use separate header files because I often make typos with my column names and it’s easier to update a single line file than to open a multi-million line file and change the first line.
I ran the following command to create a new Neo4j database from these files:
$ ./bin/neo4j-admin import \ --database=blog.db \ --mode=csv \ --nodes:Person people_header.csv,people.csv \ --nodes:Company companies_heade.csv,companies.csv
which resulted in this error message:
Neo4j version: 3.3.3 Importing the contents of these files into /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/data/databases/blog.db: Nodes: :Person /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/people_header.csv /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/people.csv :Company /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/companies.csv ... Import error: Mixing specified and unspecified group belongings in a single import isn't supported Caused by:Mixing specified and unspecified group belongings in a single import isn't supported java.lang.IllegalStateException: Mixing specified and unspecified group belongings in a single import isn't supported at org.neo4j.unsafe.impl.batchimport.input.Groups.getOrCreate(Groups.java:52) at org.neo4j.unsafe.impl.batchimport.input.csv.InputNodeDeserialization.initialize(InputNodeDeserialization.java:60) at org.neo4j.unsafe.impl.batchimport.input.csv.InputEntityDeserializer.initialize(InputEntityDeserializer.java:68) at org.neo4j.unsafe.impl.batchimport.input.csv.ParallelInputEntityDeserializer.lambda$new$0(ParallelInputEntityDeserializer.java:104) at org.neo4j.unsafe.impl.batchimport.staging.TicketedProcessing.lambda$submit$1(TicketedProcessing.java:103) at org.neo4j.unsafe.impl.batchimport.executor.DynamicTaskExecutor$Processor.run(DynamicTaskExecutor.java:237)
The output actually helpfully indicates which files it’s importing from and we can see under the ‘Company’ section that the header file is missing.
As a result of the typo I made when trying to type companies_header.csv, the tool now treats the first line of companies.csv as the header and since we haven’t specified a group (e.g. Company, Person) on that line we receive this error.
Let’s fix the typo and try again:
$ ./bin/neo4j-admin import \ --database=blog.db \ --mode=csv \ --nodes:Person people_header.csv,people.csv \ --nodes:Company companies_header.csv,companies.csv Neo4j version: 3.3.3 Importing the contents of these files into /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/data/databases/blog.db: Nodes: :Person /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/people_header.csv /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/people.csv :Company /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/companies_header.csv /Users/markneedham/Library/Application Support/Neo4j Desktop/Application/neo4jDatabases/database-b59e33d5-2060-4a5d-bdb8-0b9f6dc919fa/installation-3.3.3/companies.csv ... IMPORT DONE in 1s 5ms. Imported: 7 nodes 0 relationships 7 properties Peak memory usage: 480.00 MB
Success!
| Published on Java Code Geeks with permission by Mark Needham, partner at our JCG program. See the original article here: Neo4j Import: java.lang.IllegalStateException: Mixing specified and unspecified group belongings in a single import isn’t supported Opinions expressed by Java Code Geeks contributors are their own. |
