unit testing - Getting java.lang.NullPointerException for mvc.perform() -


i new unit testing in spring boot. trying test service , have used mockito it. when mvc.perform() null value. have used when() specify return. not sure why fails. please provide valuable inputs. here fe snippets:

@test public void testall() throws exception {      /*mockito.when(sensordao.findall()).thenreturn((iterable<sensor>) s2);     assertequals(200,expect().statuscode(200));*/      collection<sensor>list =  getentityliststubdata();     when(sensorserviceimpl.findall()).thenreturn(list);     when(sensorservice.findall()).thenreturn(list);     when(sensordao.findall()).thenreturn(list);     string uri="/sensor";     //system.out.print("gfnjhkjjhhg");     system.out.println("helllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllloooooooooooooooooooooooooooooooooooooooooooo");     system.out.println(mockmvcrequestbuilders.get(uri).accept(mediatype.application_json));     mvcresult result = mvc.perform(mockmvcrequestbuilders.get(uri).accept(mediatype.application_json)).andreturn();     string content = result.getresponse().getcontentasstring();     int status = result.getresponse().getstatus();  }

here output:

2017-08-18 19:11:45.030  info 21424 --- [           main] o.s.t.c.transaction.transactioncontext   : rolled transaction test context [defaulttestcontext@35083305 testclass = sensorservicestandaloneapplicationtests, testinstance = com.bny.sr.sensorservicestandalone.sensorservicestandaloneapplicationtests@482cd91f, testmethod = testall@sensorservicestandaloneapplicationtests, testexception = java.lang.nullpointerexception, mergedcontextconfiguration = [webmergedcontextconfiguration@8e0379d testclass = sensorservicestandaloneapplicationtests, locations = '{}', classes = '{class com.bny.sr.sensorservicestandalone.sensorservicestandaloneapplication}', contextinitializerclasses = '[]', activeprofiles = '{}', propertysourcelocations = '{}', propertysourceproperties = '{eureka.client.enabled:false, org.springframework.boot.test.context.springboottestcontextbootstrapper=true, server.port=0}', contextcustomizers = set[org.springframework.boot.test.context.springboottestcontextcustomizer@167fdd33, org.springframework.boot.test.context.filter.excludefiltercontextcustomizer@53f65459, org.springframework.boot.test.json.duplicatejsonobjectcontextcustomizerfactory$duplicatejsonobjectcontextcustomizer@74650e52, org.springframework.boot.test.mock.mockito.mockitocontextcustomizer@0, org.springframework.boot.test.autoconfigure.properties.propertymappingcontextcustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.webdrivercontextcustomizerfactory$customizer@80503], resourcebasepath = 'src/main/webapp', contextloader = 'org.springframework.boot.test.context.springbootcontextloader', parent = [null]]].  java.lang.nullpointerexception     @ com.bny.sr.sensorservicestandalone.sensorservicestandaloneapplicationtests.testall(sensorservicestandaloneapplicationtests.java:163)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:497)     @ org.junit.runners.model.frameworkmethod$1.runreflectivecall(frameworkmethod.java:50)     @ org.junit.internal.runners.model.reflectivecallable.run(reflectivecallable.java:12)     @ org.junit.runners.model.frameworkmethod.invokeexplosively(frameworkmethod.java:47)     @ org.junit.internal.runners.statements.invokemethod.evaluate(invokemethod.java:17)     @ org.junit.internal.runners.statements.runbefores.evaluate(runbefores.java:26)     @ org.springframework.test.context.junit4.statements.runbeforetestmethodcallbacks.evaluate(runbeforetestmethodcallbacks.java:75)     @ org.springframework.test.context.junit4.statements.runaftertestmethodcallbacks.evaluate(runaftertestmethodcallbacks.java:86)     @ org.springframework.test.context.junit4.statements.springrepeat.evaluate(springrepeat.java:84)     @ org.junit.runners.parentrunner.runleaf(parentrunner.java:325)     @ org.springframework.test.context.junit4.springjunit4classrunner.runchild(springjunit4classrunner.java:252)     @ org.springframework.test.context.junit4.springjunit4classrunner.runchild(springjunit4classrunner.java:94)     @ org.junit.runners.parentrunner$3.run(parentrunner.java:290)     @ org.junit.runners.parentrunner$1.schedule(parentrunner.java:71)     @ org.junit.runners.parentrunner.runchildren(parentrunner.java:288)     @ org.junit.runners.parentrunner.access$000(parentrunner.java:58)     @ org.junit.runners.parentrunner$2.evaluate(parentrunner.java:268)     @ org.springframework.test.context.junit4.statements.runbeforetestclasscallbacks.evaluate(runbeforetestclasscallbacks.java:61)     @ org.springframework.test.context.junit4.statements.runaftertestclasscallbacks.evaluate(runaftertestclasscallbacks.java:70)     @ org.junit.runners.parentrunner.run(parentrunner.java:363)     @ org.springframework.test.context.junit4.springjunit4classrunner.run(springjunit4classrunner.java:191)     @ org.junit.runner.junitcore.run(junitcore.java:137)     @ com.intellij.junit4.junit4ideatestrunner.startrunnerwithargs(junit4ideatestrunner.java:68)     @ com.intellij.rt.execution.junit.ideatestrunner$repeater.startrunnerwithargs(ideatestrunner.java:47)     @ com.intellij.rt.execution.junit.junitstarter.preparestreamsandstart(junitstarter.java:242)     @ com.intellij.rt.execution.junit.junitstarter.main(junitstarter.java:70)  2017-08-18 19:11:45.046  info 21424 --- [       thread-5] ationconfigembeddedwebapplicationcontext : closing org.springframework.boot.context.embedded.annotationconfigembeddedwebapplicationcontext@5386659f: startup date [fri aug 18 19:11:34 ist 2017]; root of context hierarchy 2017-08-18 19:11:45.054  info 21424 --- [       thread-5] j.localcontainerentitymanagerfactorybean : closing jpa entitymanagerfactory persistence unit 'default'  process finished exit code -1

here debug result:

debug results

since spring-boot 1.4.0 can use @webmvctest auto-configure mockmvc. also, use @mockbean mock dependency in controller.

@runwith(springrunner.class) @webmvctest(mycontroller.class) public class mycontrollertest {      @autowired     private mockmvc mvc;      @mockbean     private sensordao sensordao;  }

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