title: jackson cannot deserialize (spring cloud stream kafka)
body: <p>I am trying to read a json message from kafka and got an exception, which says Jackson cannot deserialize the json to POJO.</p>
  
  <p>The json is like <code>{"code":"500","count":22,"from":1528343820000,"to":1528343880000}</code>, which is an output of kafka stream.</p>
  
  <p>The POJO declares all attributes of the json, and is exactly the same POJO to produce the json message. So I have no idea why it would happen.</p>
  
  <p>I am using spring cloud stream 2.0.0.RELEASE.</p>
  
  <p>Any help would be appreciated. Thanks.</p>
  
  <p>POJO:</p>
  
  <pre><code>public class CodeCount {
      private String code;
      private long count;
      private Date from;
      private Date to;
  
      @Override
      public String toString() {
          return "CodeCount [code=" + code + ", count=" + count + ", from=" + from + ", to=" + to + "]";
      }
  
      public CodeCount(String code, long count, Date from, Date to) {
          super();
          this.code = code;
          this.count = count;
          this.from = from;
          this.to = to;
      }
  
      public String getCode() {
          return code;
      }
  
      public void setCode(String code) {
          this.code = code;
      }
  
      public long getCount() {
          return count;
      }
  
      public void setCount(long count) {
          this.count = count;
      }
  
      public Date getFrom() {
          return from;
      }
  
      public void setFrom(Date from) {
          this.from = from;
      }
  
      public Date getTo() {
          return to;
      }
  
      public void setTo(Date to) {
          this.to = to;
      }
  }
  </code></pre>
  
  <p>Stacktrace:</p>
  
  <pre><code>2018-06-07 15:18:51.572 ERROR 1 --- [container-0-C-1] o.s.integration.handler.LoggingHandler   : org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Cannot construct instance of `com.example.CodeCount` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
   at [Source: (byte[])"{"code":"500","count":22,"from":1528343820000,"to":1528343880000}"; line: 1, column: 2]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.example.CodeCount` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
  at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1451) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1027) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1275) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:325) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4001) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3109) ~[jackson-databind-2.9.3.jar!/:2.9.3]
  at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:221) ~[spring-messaging-5.0.6.RELEASE.jar!/:5.0.6.RELEASE]
  ... 37 common frames omitted
  </code></pre>