{"action":"opened","issue":{"url":"https://api.github.com/repos/FasterXML/jackson-core/issues/218","labels_url":"https://api.github.com/repos/FasterXML/jackson-core/issues/218/labels{/name}","comments_url":"https://api.github.com/repos/FasterXML/jackson-core/issues/218/comments","events_url":"https://api.github.com/repos/FasterXML/jackson-core/issues/218/events","html_url":"https://github.com/FasterXML/jackson-core/issues/218","id":107348237,"number":218,"title":"Question: How to exclude all type information for collections","user":{"login":"fzakaria","id":605070,"avatar_url":"https://avatars.githubusercontent.com/u/605070?v=3","gravatar_id":"","url":"https://api.github.com/users/fzakaria","html_url":"https://github.com/fzakaria","followers_url":"https://api.github.com/users/fzakaria/followers","following_url":"https://api.github.com/users/fzakaria/following{/other_user}","gists_url":"https://api.github.com/users/fzakaria/gists{/gist_id}","starred_url":"https://api.github.com/users/fzakaria/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fzakaria/subscriptions","organizations_url":"https://api.github.com/users/fzakaria/orgs","repos_url":"https://api.github.com/users/fzakaria/repos","events_url":"https://api.github.com/users/fzakaria/events{/privacy}","received_events_url":"https://api.github.com/users/fzakaria/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-09-19T18:14:46Z","updated_at":"2015-09-19T18:14:46Z","closed_at":null,"body":"I have a jackson annotated class with a Map<String,Object> parameter.\r\n\r\nIt is being set to a SingletonMap\r\n\r\n{\"attributes\":{\"@class\":\"java.util.Collections$SingletonMap\",\"PARAMETER_INPUT\":{\"@class\":\"com.github.fzakaria.sample.wf.SimpleParameterWorkflow$WorkflowParameter\",\"name\":\"INPUT\",\"time\":\"2015-09-19T14:47:23.491Z[America/Los_Angeles]\",\"count\":343}}}\r\n\r\n\r\nJackson cannot seem to build a SingletonMap (no default constructor).\r\nIs there a way to instruct Jackson to exclude TypeInfo for all Collection interfaces (non-concrete) "}}