title: Test Unit Controller Rest Pageable
body: <p>I am trying to perform a unit test on a call from my Controller but I get a <strong>NullPointerException</strong>. The callback returns a <code>ResponseEntity &lt;Page&gt;</code> object as exemplified below:</p>
  
  <pre><code>@GetMapping
  public ResponseEntity&lt;Page&lt;CentroDeCusto&gt;&gt; centrosDeCustos(Pageable paginacao) {
      Page&lt;CentroDeCusto&gt; centrosDeCustos = centroDeCustoRepository.departamentosPorDataDeAtualizacao(paginacao);
  
      if (centrosDeCustos.hasContent())
          return new ResponseEntity&lt;&gt;(centrosDeCustos, HttpStatus.OK);
      else
          return new ResponseEntity&lt;&gt;(centrosDeCustos, HttpStatus.NOT_FOUND);
  }
  </code></pre>
  
  <p>This is my controller test class:</p>
  
  <pre><code>@RunWith(SpringRunner.class)
  @SpringBootTest
  @AutoConfigureMockMvc
  public class CentroDeCustoRestControllerTeste {
  
  @Autowired
  private MockMvc mvc;
  
  @MockBean
  private CentroDeCustoRepository repository;
  
  @Test
  @WithMockUser(username = "teste-app-@teste.com", authorities = {"ADMIN"})
  public void aoBuscarCentrosDeCustoRetornarUmaListaComVariosCentrosDeCusto() throws Exception {
      PageRequest paginacao = PageRequest.of(1, 10);
      List&lt;CentroDeCusto&gt; centrosDeCustos = Arrays.asList(new CentroDeCusto(), new CentroDeCusto());
      Page&lt;CentroDeCusto&gt; centrosDeCustosPage = new PageImpl&lt;&gt;(centrosDeCustos, paginacao, centrosDeCustos.size());
  
      given(repository.departamentosPorDataDeAtualizacao(paginacao)).willReturn(centrosDeCustosPage);
  
      mvc.perform(get("/centrosdecustos").contentType(MediaType.APPLICATION_JSON))
              .andExpect(status().isOk());
  }
  </code></pre>
  
  <p><strong>The error occurs in this Controller call: if (centrosDeCustos.hasContent())</strong></p>
  
  <p>Follow the error details:</p>
  
  <pre><code>org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
  
  at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
  at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
  at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
  at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:71)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
  at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166)
  at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
  at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
  at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
  at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
  at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
  at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
  at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
  at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
  at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
  at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
  at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
  at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
  at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:165)
  at br.com.tete.unidade.centrodecusto.CentroDeCustoRestControllerTeste.aoBuscarCentrosDeCustoRetornarUmaListaComVariosCentrosDeCusto(CentroDeCustoRestControllerTeste.java:72)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
  at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
  at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
  at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
  at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
  at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
  at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
  at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
  at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
  Caused by: java.lang.NullPointerException
  at br.com.tete.centrocusto.CentroDeCustoController.centrosDeCustos(CentroDeCustoController.java:31)
  at br.com.tete.centrocusto.CentroDeCustoController$$FastClassBySpringCGLIB$$d47fb791.invoke(&lt;generated&gt;)
  at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
  at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
  at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:69)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
  at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
  at br.com.tete.centrocusto.CentroDeCustoController$$EnhancerBySpringCGLIB$$398ebec1.centrosDeCustos(&lt;generated&gt;)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
  at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
  at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
  at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877)
  at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783)
  at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
  at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
  at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
  at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
  ... 83 more
  </code></pre>
  
  <p>Could someone please help me?</p>