java - Validate model when it is created from json string in spring -


i preparing model json string using json jackson object mapper in spring.

my code 

   objectmapper mapper = new objectmapper();    string empvalue =  mapper.writevalueasstring(employeemap);    employees employee = mapper.readvalue(empvalue, employees.class);

before preparing object of employee want validate json because if mismatched data set through exception while preparing model.how can it?

you can valuable information out of exception out of jsonmappingexception class , sub classes (under com.fasterxml.jackson.databind.exc package) using getpath , getpathreference methods

here 2 examples:

public class objectmappertest {     private   objectmapper objectmapper;      @before     public void setup() {         objectmapper = new objectmapper();     }      @test     public void testwrongdatatype() {         string personstr = "{\"age\":\"100y\",\"firstname\":\"jackson\",\"lastname\":\"pollock\",\"gender\":\"m\"}";         try {             objectmapper.readvalue(personstr, person.class);         } catch (jsonmappingexception jme) {                 system.out.println(jme.getmessage());                 if(jme instanceof invalidformatexception) {                     invalidformatexception ife = (invalidformatexception)jme;                     system.out.println("mapping failure on field:" + ife.getpathreference());                     system.out.println("expected type: " + ife.gettargettype());                     system.out.println("provided value: " + ife.getvalue());                 }         }catch (exception  e){             system.out.println(e.getmessage());         }     }      @test     public void testunrecognizedproperty() {         string personstr = "{\"gae\":\"100\",\"firstname\":\"jackson\",\"lastname\":\"pollock\",\"gender\":\"m\"}";         try {             objectmapper.readvalue(personstr, person.class);         } catch (jsonmappingexception jme) {             system.out.println(jme.getmessage());             if(jme instanceof propertybindingexception) {                 propertybindingexception pbe = (propertybindingexception) jme;                 system.out.println("mapping failure on field:" + pbe.getpathreference());                 system.out.println("unexpected field: " + pbe.getpropertyname());             }         }catch (exception  e){             system.out.println(e.getmessage());         }     } }

the output 

testunrecognizedproperty: ======================== unrecognized field "gae" (class person), not marked ignorable (4 known properties: "lastname", "gender", "firstname", "age"])  @ [source: {"gae":"100","firstname":"jackson","lastname":"pollock","gender":"m"}; line: 1, column: 9] (through reference chain: person["gae"]) mapping failure on field:person["gae"] unexpected field: gae testwrongdatatype: ========================  can not construct instance of java.lang.integer string value '100y': not valid integer value  @ [source: {"age":"100y","firstname":"jackson","lastname":"pollock","gender":"m"}; line: 1, column: 2] (through reference chain: person["age"]) mapping failure on field:person["age"] expected type: class java.lang.integer provided value: 100y

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