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    Jackson 1.x and Jackson 2.x annotations are in different places inside Java, so this can be either import related (check if you imported the right one) or you might have different versions in your classpath causing conflict.

Solutions on the web

via Jenkins JIRA by ajpurkiss, 1 year ago
via Jenkins JIRA by ajpurkiss, 1 year ago
via Jenkins JIRA by Sean DeNigris, 1 year ago
via Jenkins JIRA by Sean DeNigris, 1 year ago
via 1987.io by Unknown author, 2 years ago
net.sf.json.JSONException: null object	at net.sf.json.JSONObject.verifyIsNull(JSONObject.java:2498)	at net.sf.json.JSONObject.get(JSONObject.java:1712)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:285)