休息片刻之后，我最近一直在使用Neo4j导入工具 ，并遇到了我最初不理解的有趣的错误消息。

我有一些CSV文件，其中包含要导入Neo4j的节点。 它们的内容如下所示：

$ 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"

我发现使用单独的头文件更容易，因为我经常使用列名进行拼写错误，并且更新单个行文件比打开数百万行文件并更改第一行更容易。

我运行以下命令从这些文件创建新的Neo4j数据库：

$ ./bin/neo4j-admin import \--database=blog.db \--mode=csv \--nodes:Person people_header.csv,people.csv \--nodes:Company companies_heade.csv,companies.csv

导致此错误消息：

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 supportedat 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)

输出实际上有助于指出要从中导入哪些文件，我们可以在“公司”部分下看到头文件丢失。

由于试图输入companies_header.csv当我做了错字的结果，该工具现在会将companies.csv的第一行作为标题，并因为我们还没有在该行指定的一组（如公司，个人）我们收到这个错误。

让我们修复打字错误，然后重试：

$ ./bin/neo4j-admin import \--database=blog.db \--mode=csv \--nodes:Person people_header.csv,people.csv \--nodes:Company companies_header.csv,companies.csvNeo4j 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 nodes0 relationships7 properties
Peak memory usage: 480.00 MB

成功！

翻译自: https://www.javacodegeeks.com/2018/03/neo4j-import-java-lang-illegalstateexception-mixing-specified-unspecified-group-belongings-single-import-isnt-supported.html