junit - Unit test mock for RestTemplate -

i have service method resttemplate. part of unit test, trying mock how failing.

service method:

@autowired private resttemplate getresttemplate;  return getresttemplate.getforobject(restdiagnosisgeturl, sfdccustomerresponsetype.class); 

test method:

private carestosfdcresponseconverter carestosfdcresponseconverter;      @before     public void setup() throws exception {         carestosfdcresponseconverter = new carestosfdcresponseconverter();      }     @test     public void testconvert(){     resttemplate mock = mockito.mock(resttemplate.class);          mockito.when(mock.getforobject(matchers.anystring(), matchers.eq(sfdccustomerresponsetype.class))).thenreturn(sfdccustomerresponsetype); } sfdcrequest = carestosfdcresponseconverter.convert(responseforsfdcandhybris); 

it giving nullpointerexception. looks failing mock rest template , breaking there rest template null. appreciated.thanks

it's not failing mock rest template, it's not injecting mocked rest template production class. there @ least 2 ways fix this.

you can change production code , use constructor injection. move resttemplate constructor parameter , can pass mock in test:

@service public class myservice {     @autowired     public myservice(resttemplate resttemplate) {         this.resttemplate = resttemplate;     } } 

in test create service other object , pass mocked rest template.

or can change test inject service using following annotation:

@runwith(mockitojunitrunner.class) public class myservicetest {     @injectmocks     private myservice myservice;      @mock     private resttemplate resttemplate;      @test     public void testconvert(){          mockito.when(mock.getforobject(matchers.anystring(), matchers.eq(sfdccustomerresponsetype.class))).thenreturn(sfdccustomerresponsetype);     } } 

you can see example in question: using @mock , @injectmocks

i prefer constructor injection.