Logstash parse failure with TCP input and JSON codec. LS 1.3.3.

logstash.conf

input {
  log4j {
    port  => 4560
    type  => "log4j"
    codec => plain { charset => "ISO-8859-1" }
  }

  tcp {
    codec => oldlogstashjson
    port  => 4561
    type  => "lsold"
  }

  tcp {
    codec => json
    port  => 4563
    type  => "lsnew"
  }

  tcp {
    codec => json_lines
    port  => 4564
    type  => "lsnew_nl"
  }

}

output {
  elasticsearch_http {
    host => "eslog01.example.com"
    template_overwrite => true
  }
}

logstash.log

{
:timestamp=>"2014-03-06T10:53:18.496000+0100",
:message=>"JSON parse failure. Falling back to plain-text",
:error=>#<JSON::ParserError: unexpected token at
'{
"app":"core",
"class":null,
"logger_name":"core",
"file":"parameterset",
"line":172,
"message":"Loaded 2 parameter set release definitions",
"thread":"main",
"hostname":"coredev01.dev.example.at",
"method":"load_releases",
"priority":"INFO",
"ecTxId":null,
"@timestamp":"2014-03-06T10:53:18.492526+01"
}'
>,
 
:data=>"{\"app\":\"core\",
\"class\":null,
\"logger_name\":\"core\",
\"file\":\"entity\",
\"line\":365,
\"message\":\"ParameterRelease DB load: 2 entries\",
\"thread\":\"main\",
\"hostname\":\"coredev01.dev.example.at\",
\"method\":\"load_from\",
\"priority\":\"DEBUG2\",
\"ecTxId\":null,
\"@timestamp\":\"2014-03-06T10:53:18.492232+01\"}{\"app\":\"core\",
\"class\":null,
\"logger_name\":\"core\",
\"file\":\"parameterset\",
\"line\":172,
\"message\":\"Loaded 2 parameter set release definitions\",
\"thread\":\"main\",
\"hostname\":\"coredev01.dev.example.at\",
\"method\":\"load_releases\",
\"priority\":\"INFO\",
\"ecTxId\":null,
\"@timestamp\":\"2014-03-06T10:53:18.492526+01\"}",
 
:level=>:info, 
:file=>"/opt/logstash/logstash.jar!/logstash/codecs/json.rb", 
:line=>"38"
}