No problem Luca, but still the same problem. Here are my JSON's. Just in 
case I have something missing there. I braked it down to the things I 
really need:

Person ETL:
{
  "config": {
    "verbose": true

  },
  "extractor" : {
    "jdbc": { "driver": "com.mysql.jdbc.Driver",
              "url": "jdbc:mysql://localhost/test",
              "userName": "root",
              "userPassword": "",
              "query": "select * from person" }
  },
  "transformers" : [
   { "vertex": { "class": "Person"} }
  ],
   "loader" : {
    "orientdb": {
      "dbURL": "plocal:D:\Eclipse LaTeX\DB - orientdb\databases\Test5",
      "tx": true,
      "batchCommit": 5000,
      "wal" : true,
      "dbType": "graph"
    }
  }
}


Post and edge Wrote ETL:
{
  "config": {
    "verbose": true

  },
  "extractor" : {
    "jdbc": { "driver": "com.mysql.jdbc.Driver",
              "url": "jdbc:mysql://localhost/test",
              "userName": "root",
              "userPassword": "",
              "query": "select * from post" }
  },
  "transformers" : [
   { "vertex": { "class": "Post"} },
   { "edge": { "class": "Wrote", "direction" : "in", 
            "joinFieldName": "person_id",
            "lookup":"Person.id", "unresolvedLinkAction":"CREATE"} }
  ],
  "loader" : {
    "orientdb": {
      "dbURL": "plocal:D:\Eclipse LaTeX\DB - orientdb\databases\Test5",
      "tx": true,
      "batchCommit": 5000,
      "wal" : true,
      "dbType": "graph"
    }
  }
}

And Luca, no the Edge problem was already fixed be meself =)

not it's this here take I can't handle to fix =/

Exception in thread "main" java.lang.IllegalArgumentException: Property 
value can not be null




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