[SOLVED] org.jboss.resteasy.spi.UnhandledException: org.codehaus.jackson.JsonGenerationException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?)

Error added: 2016-05-09T11:01:06Z

0 people waiting for the answer...

1 answers found.

Answer 2385 (100.0% helpful)

Check your map keys for nulls before putting

if (key != null) {
  map.put(key, foo);

Add an answer/solution

If you know the answer, please add your own solution below.
If you don't know, but find out later, please come back and share your answer - there will be other people struggling with this too.

Please enter 61948 here

If you want to be notified via email when this is solved, enter your email address here: