My research so far on this issue makes me think that this is related to the Jackson JAXB support. For some reason the JAXB annotations works for JDK 1.8 and they are recognized. Jackson has this JAXB annotation introspector that due this change makes it work on JDK 1.8. Hence prevent this "annotation introspector" registration would solve this:

• One way to prevent it from being registered is create a custom ObjectMapper (entry point to configure Jackson/JSON resteasy output) in RESTeasy. To do this we create a JAR with a simply ObjectMapper:

  import javax.ws.rs.Consumes;
  import javax.ws.rs.Produces;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.ext.ContextResolver;
  import javax.ws.rs.ext.Provider;
  import org.codehaus.jackson.map.ObjectMapper;
  
  @Provider
  @Produces(MediaType.APPLICATION_JSON)
  @Consumes(MediaType.APPLICATION_JSON)
  public class CustomObjectMapper implements ContextResolver<ObjectMapper> {
  
          private final ObjectMapper objectMapper;
  
          public CustomObjectMapper() {
                  System.out.println("== Creating Custom Object Mapper ==");
                  objectMapper = new ObjectMapper();
          }
  
          public ObjectMapper getContext(Class<?> type) {
                  return objectMapper;
          }
  }
  

• Another solution is simply remove the `jackson-jaxrs- {version}

  .jar` from `business-central.war/WEB-INF/lib` because in this jackson jaxrs is the JAXB annotation introspector registration.

• Start BPM Suite using JDK 1.7;
• Create instances of a process that has human tasks;
• Use the `task/query` to query the tasks for a given process instance, see:
  ***$ curl -X GET -u 'bpmsAdmin:redhat2014!' -H 'Accept: application/json' http://localhost:8080/business-central/rest/task/query?processInstanceId=1***

  {"status":null,"url":null,"index":null,"commandName":null,"taskSummaryList":[{"@class":"org.kie.services.client.serialization.jaxb.impl.task.JaxbTaskSummary","id":1,"name":"Task_1","subject":"","description":"","status":"Reserved","priority":0,"skipable":true,"actualOwnerId":"bpmsAdmin","createdById":"bpmsAdmin","createdOn":1478042168434,"activationTime":1478042168434,"expirationTime":null,"processInstanceId":1,"processId":"test.test","processSessionId":2,"deploymentId":"example:test:1.0","quickTaskSummary":false,"parentId":-1,"potentialOwners":null}],"pageNumber":null,"pageSize":null}
  

Notice the fields has no hyphen

• Start BPM Suite using JDK 1.8
• Check the same endpoint output. Check the hyphens on this version, for example:

  {
      "index": null,
      "taskSummaryList": [
          {
              "@class": "org.kie.services.client.serialization.jaxb.impl.task.JaxbTaskSummary",
              "id": 135,
              "status": "Created",
              "priority": 0,
              "skipable": true,
              "created-on": 1477603386560,
              "activation-time": 1477603386560,
              "process-instance-id": 390,
              "process-id": "my-process",
              "process-session-id": 311,
              "deployment-id": "com.mycompany:my_proj:1.0",
              "quick-task-summary": false,
              "parent-id": -1
          }
      ]
  }