title: Spring Boot Restfull api get : nesting excepion
body: <p>I want to use @RestController and  @RequestMapping make a restfull api service project, but when I use appDao.findAll() to get all apps, get nesting excepion, code like:</p>
  
  <p>App.java</p>
  
  <pre><code>@Entity
  @Table(name = "apps")
  public class App {
  
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private long id;
  
  
      @NotNull
      private String name;
  
      public App() { }
  
      public App(String name, User user) {
          this.name = name;
          this.user = user;
      }
  
      public long getId() {
          return id;
      }
  
      public void setId(long id) {
          this.id = id;
      }
  
      public String getName() {
          return name;
      }
  
      public void setName(String name) {
          this.name = name;
      }
  
      @ManyToOne(fetch=FetchType.LAZY)
      @JoinColumn(name = "user_id")
      private User user;
  
      public User getUser(){
          return user;
      }
  
      public void setUser(User user) {
          this.user = user;
      }
  
      @Override
      public String toString(){
  
          return "AppName: " + name;
      }
  
  
  }
  </code></pre>
  
  <p>User.java</p>
  
  <pre><code>@Entity
  @Table(name = "users")
  public class User {
  
      // ------------------------
      // PRIVATE FIELDS
      // ------------------------
  
      // An autogenerated id (unique for each user in the db)
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private long id;
  
  
      // The user's email
      @NotNull
      private String email;
  
      // The user's name
      @NotNull
      private String name;
  
      @NotNull
      private Integer age;
  
      // ------------------------
      // PUBLIC METHODS
      // ------------------------
  
      public User() { }
  
      public User(long id) {
          this.id = id;
      }
  
      public User(String name) {
          this.name = name;
      }
  
      public User(String email, String name, Integer age) {
          this.email = email;
          this.name = name;
          this.age = age;
      }
  
      // Getter and setter methods
  
      public long getId() {
          return id;
      }
  
      public void setId(long value) {
          this.id = value;
      }
  
      public String getEmail() {
          return email;
      }
  
      public void setEmail(String value) {
          this.email = value;
      }
  
      public String getName() {
          return name;
      }
  
      public void setName(String value) {
          this.name = value;
      }
  
      public Integer getAge() {
          return age;
      }
  
      public void setAge(Integer value) {
          this.age = value;
      }
  
      @OneToOne(cascade = CascadeType.ALL)
      @JoinColumn(name = "car_id")
      private Car car;
      public Car getCar() {
          return car;
      }
  
      public void setCar(Car car) {
          this.car = car;
      }
  
      @OneToMany(targetEntity=App.class, mappedBy="user", fetch=FetchType.EAGER, cascade=CascadeType.ALL)
      private Set&lt;App&gt; apps;
  
      public Set&lt;App&gt; getApps() {
          return apps;
      }
  
      public void setApps(Set&lt;App&gt; apps) {
          this.apps= apps;
      }
  
      public void addApps(Set&lt;App&gt; apps) {
          this.apps.addAll(apps);
      }
  
      @Override
      public String toString() {
          String result = String.format(
                  "User[id=%d, name='%s']%n",
                  id, name);
          if (apps != null) {
              for(App app : apps) {
                  result += String.format(
                          "app[id=%d, name='%s']%n",
                          app.getId(), app.getName());
              }
          }
  
          return result;
      }
  } // class User
  </code></pre>
  
  <p>AppDao.java</p>
  
  <pre><code>@Transactional
  public interface AppDao extends JpaRepository&lt;App, Long&gt; {
  
      /**
       * This method will find an User instance in the database by its email.
       * Note that this method is not implemented and its working code will be
       * automagically generated from its signature by Spring Data JPA.
       */
  
  }
  </code></pre>
  
  <p>AppController.java</p>
  
  <pre><code>@RestController
  @RequestMapping("/apps")
  public class AppController {
  
      @Autowired
      private AppDao appDao;
  
      @RequestMapping("/")
      public List&lt;App&gt; getAll() {
          List&lt;App&gt; apps = appDao.findAll();
          return apps;
      }
  }
  </code></pre>
  
  <p>Main Java:</p>
  
  <pre><code>@SpringBootApplication
  @EnableAutoConfiguration 
  public class MysqlDemoApplication implements CommandLineRunner {
  
      public static void main(String[] args) {
          SpringApplication.run(MysqlDemoApplication.class, args);
      }
  
      @Override
      @Transactional
      public void run(String... strings) throws Exception {
      }
  
  }
  </code></pre>
  
  <p>then visit :<a href="http://localhost:8080/apps/" rel="nofollow">http://localhost:8080/apps/</a> get nested exception: why?</p>
  
  <p>backtrace: </p>
  
  <pre><code>com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:24) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:675) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:675) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:149) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:111) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:24) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:675) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:675) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:149) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:111) ~[jackson-databind-2.6.6.jar:2.6.6]
          at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:24) ~[jackson-databind-2.6.6.jar:2.6.6]
  
      2016-06-28 11:01:18.675 ERROR 90592 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet dispatcherServlet threw exception
  
      java.lang.IllegalStateException: getOutputStream() has already been called for this response
          at org.apache.catalina.connector.Response.getWriter(Response.java:564) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:212) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView.render(ErrorMvcAutoConfiguration.java:195) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1246) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1029) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:973) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:720) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:584) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:523) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:439) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:304) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:399) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:179) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_65]
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_65]
          at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
  
      2016-06-28 11:01:18.678 ERROR 90592 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost]           : Exception Processing ErrorPage[errorCode=0, location=/error]
  
      org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: getOutputStream() has already been called for this response
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:979) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:720) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:584) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:523) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:439) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:304) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:399) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:179) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_65]
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_65]
          at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.33.jar:8.0.33]
          at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
      Caused by: java.lang.IllegalStateException: getOutputStream() has already been called for this response
          at org.apache.catalina.connector.Response.getWriter(Response.java:564) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:212) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
          at org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView.render(ErrorMvcAutoConfiguration.java:195) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1246) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1029) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:973) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) ~[spring-webmvc-4.2.6.RELEASE.jar:4.2.6.RELEASE]
          ... 37 common frames omitted
  </code></pre>