Java Agent is sending empty? Transations/Span

Elastic Observability APM
4

Here the full agent log on log level TRACe

The error comes in the APM UI -> Traces -> and selecting an entry.
Side Fact: if i select the service in the APM UI I get a white screen with the following error in the browser console

TypeError: Cannot read property 'transaction' of undefined
    at render (/bundles/apm.bundle.js:2)
    at EuiBasicTable.renderItemFieldDataCell (/dlls/vendors.bundle.dll.js:89)
    at /dlls/vendors.bundle.dll.js:89
    at Array.forEach (<anonymous>)
    at EuiBasicTable.renderItemRow (/dlls/vendors.bundle.dll.js:89)
    at /dlls/vendors.bundle.dll.js:89
    at Array.map (<anonymous>)
    at EuiBasicTable.renderTableBody (/dlls/vendors.bundle.dll.js:89)
    at EuiBasicTable.renderTable (/dlls/vendors.bundle.dll.js:89)
    at EuiBasicTable.render (/dlls/vendors.bundle.dll.js:89)
    at l (/dlls/vendors.bundle.dll.js:212)
    at beginWork (/dlls/vendors.bundle.dll.js:212)
    at e (/dlls/vendors.bundle.dll.js:212)
    at f (/dlls/vendors.bundle.dll.js:212)
    at G (/dlls/vendors.bundle.dll.js:212)
    at x (/dlls/vendors.bundle.dll.js:212)

Here the documents that are in elasticsearch:
curl http://drs-s-els01:9200/apm-6.6.2-span*/_search?pretty

  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 4,
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "apm-6.6.2-span-2019.04.29",
        "_type" : "doc",
        "_id" : "9ZbhaGoB5YyhnPC3MMCU",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-span-2019.04.29",
        "_type" : "doc",
        "_id" : "95bhaGoB5YyhnPC3MMCU",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-span-2019.04.29",
        "_type" : "doc",
        "_id" : "GaToaGoB5YyhnPC3tr5n",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-span-2019.04.29",
        "_type" : "doc",
        "_id" : "G6ToaGoB5YyhnPC3tr5n",
        "_score" : 1.0
      }
    ]
  }
}

curl http://drs-s-els01:9200/apm-6.6.2-tran*/_search?pretty

"hits" : [
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "9pbhaGoB5YyhnPC3MMCU",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "-JbhaGoB5YyhnPC3MMCU",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "GqToaGoB5YyhnPC3tr5n",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "HKToaGoB5YyhnPC3tr5n",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "V6vuaGoB5YyhnPC3rZTk",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "HKvuaGoB5YyhnPC31N71",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "zeIiaWoB5YyhnPC3akeI",
        "_score" : 1.0
      },
      {
        "_index" : "apm-6.6.2-transaction-2019.04.29",
        "_type" : "doc",
        "_id" : "xOIiaWoB5YyhnPC3kXne",
        "_score" : 1.0
      }
    ]