No content to map due to end-of-input jackson parser
Don’t know how it worked and why it worked? 🙁 but it worked
jackson
JsonMappingException: No suitable constructor found for type [simple type, class ]: can not instantiate from JSON object
So, finally I realized what the problem is. It is not a Jackson configuration issue as I doubted. Actually the problem was in ApplesDO Class: There was a custom constructor defined for the class making it the default constructor. Introducing a dummy constructor has made the error to go away:
Jackson with JSON: Unrecognized field, not marked as ignorable
I need to convert a certain JSON string to a Java object. I am using Jackson for JSON handling. I have no control over the input JSON (I read from a web service). This is my input JSON: Here is a simplified use case: My entity class is: My Wrapper class is basically a container … Read more
An established connection was aborted by the software in your host machine tomcat jackson
Eh… after hours of debugging and thinking – the answer turned out to be the most obvious one – both clients I have been using were closing the connection (probably timeout). It worked in wget and postman while using swagger and advanced rest client caused the exception to be thrown.
How to convert the following json string to java object?
No need to go with GSON for this; Jackson can do either plain Maps/Lists: or more convenient JSON Tree: By the way, there is no reason why you could not actually create Java classes and do it (IMO) more conveniently:
Only using @JsonIgnore during serialization, but not deserialization
Exactly how to do this depends on the version of Jackson that you’re using. This changed around version 1.9, before that, you could do this by adding @JsonIgnore to the getter. Which you’ve tried: Add @JsonIgnore on the getter method only Do this, and also add a specific @JsonProperty annotation for your JSON “password” field name to the setter method for the … Read more
Converting JSON data to Java object
I looked at Google’s Gson as a potential JSON plugin. Can anyone offer some form of guidance as to how I can generate Java from this JSON string? Google Gson supports generics and nested beans. The [] in JSON represents an array and should map to a Java collection such as List or just a plain Java array. The {} in JSON … Read more
When is the @JsonProperty property used and what is it used for?
Here’s a good example. I use it to rename the variable because the JSON is coming from a .Net environment where properties start with an upper-case letter. This correctly parses to/from the JSON:
Representing null in JSON
Let’s evaluate the parsing of each: http://jsfiddle.net/brandonscript/Y2dGv/ The tl;dr here: The fragment in the json2 variable is the way the JSON spec indicates null should be represented. But as always, it depends on what you’re doing — sometimes the “right” way to do it doesn’t always work for your situation. Use your judgement and make an informed decision. JSON1 {} This returns an empty … Read more
When is the @JsonProperty property used and what is it used for?
Here’s a good example. I use it to rename the variable because the JSON is coming from a .Net environment where properties start with an upper-case letter. This correctly parses to/from the JSON: