REST API Json Cast Command Error

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Vicente Hidalgo Santamaria

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Apr 20, 2016, 7:02:44 AM4/20/16
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I'm getting a cast error when calling the Rest API with Json commands. The request body is very simple. The same request with XStream works perfectly. 

I'm using the following headers:
X-KIE-ContentType: json
Content-Type: application/json 

Json Request body:
{
   "batch-execution":{
      "lookup":"ksession1",
      "commands":[
         {
            "insert":{  
               "object":{  
                  "com.vicente.auto.Car":{  
                     "brand":"john",
                     "wheels":"25"
                  }
               }
            }
         },
         {
            "fire-all-rules":""
         }
      ]
   }
}

Java Class:
package com.vicente.auto;


import javax.annotation.Generated;

@Generated("org.jsonschema2pojo")
public class Car {

    private String brand;
    private String wheels;

    /**
     * No args constructor for use in serialization
     *
     */
    public Car() {
    }

    /**
     *
     * @param wheels
     * @param brand
     */
    public Car(String brand, String wheels) {
        this.brand = brand;
        this.wheels = wheels;
    }

    /**
     *
     * @return
     * The brand
     */
    public String getBrand() {
        return brand;
    }

    /**
     *
     * @param brand
     * The brand
     */
    public void setBrand(String brand) {
        this.brand = brand;
    }

    /**
     *
     * @return
     * The wheels
     */
    public String getWheels() {
        return wheels;
    }

    /**
     *
     * @param wheels
     * The wheels
     */
    public void setWheels(String wheels) {
        this.wheels = wheels;
    }

}

Drl:
package com.vicente.auto;


rule "count Wheels"
dialect "mvel"
    when
        Car( $numWheels : getWheels())
    then
        System.out.println("Num Wheels: "+ $numWheels);
end




Error Trace:
12:14:02,741 ERROR [org.kie.server.services.drools.DroolsKieContainerCommandServiceImpl] (default task-10) Error calling container 'car': java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to org.kie.api.command.Command
at org.kie.server.services.drools.DroolsKieContainerCommandServiceImpl.callContainer(DroolsKieContainerCommandServiceImpl.java:59) [kie-server-services-drools-6.4.0.Final.jar:6.4.0.Final]
at org.kie.server.remote.rest.drools.CommandResource.manageContainer(CommandResource.java:72) [kie-server-rest-drools-6.4.0.Final.jar:6.4.0.Final]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_65]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_65]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_65]
at java.lang.reflect.Method.invoke(Method.java:497) [rt.jar:1.8.0_65]
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:137) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:296) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:250) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:237) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:179) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56) [resteasy-jaxrs-3.0.10.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51) [resteasy-jaxrs-3.0.10.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_65]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_65]


Vicente Hidalgo Santamaria

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Apr 20, 2016, 7:04:25 AM4/20/16
to Drools Usage
Using KIE 6.4.0

Maciej Swiderski

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Apr 20, 2016, 7:24:07 AM4/20/16
to drools...@googlegroups.com
the payload of your request should be:

{
      "lookup":"ksession1",
      "commands":[
         {
            "insert":{  
               "object":{  
                  "com.vicente.auto.Car":{  
                     "brand":"john",
                     "wheels":"25"
                  }
               }
            }
         },
         {
            "fire-all-rules":""
         }
      ]
   }
just skip the batch-execution part and it should work

Maciej
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Diego Mendez

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Jun 29, 2016, 10:29:40 AM6/29/16
to Drools Usage
Hi,
I came across with the same problem. 
I have reassembled your code, and I'm still having the same error:
{
"org.kie.server.api.model.ServiceResponse": {
"type": "FAILURE"
"msg": "Error calling container vicenteDrools: java.util.LinkedHashMap cannot be cast to org.kie.api.command.Command"
"result": null
}-
}

I'm using wildfly 8.2.0 + kie-server-6.4.0.Final-ee7.war.

Here's my proyect and the server log. Please, take a look 
thx.

srinivas rao

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Oct 16, 2016, 1:45:11 AM10/16/16
to Drools Usage
hey even ia m facing same issue from past 2 months maciej can u help on this  changed payload how u said but still the same error.

srinivas rao

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Oct 16, 2016, 2:02:12 AM10/16/16
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Maciej Swiderski

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Oct 16, 2016, 12:24:33 PM10/16/16
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Describe what you have now and what errors 

Maciej 
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Alok Singh

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Oct 27, 2016, 7:26:48 AM10/27/16
to Drools Usage

My Input to the KIE Server(ver: 6.4) is:
<batch-execution>
  <insert out-identifier="productBeanList" return-object="true" entry-point="DEFAULT">
    <hmorgunit.Discount>
      <userRole>C1</userRole>
      <organization>HM</organization>
    </hmorgunit.Discount>
  </insert>
</batch-execution>

and getting response as:


The filteredProductJson:<org.kie.server.api.model.ServiceResponse>
  <type>FAILURE</type>
  <msg>Error calling container Test:  : input contained no data</msg>
</org.kie.server.api.model.ServiceResponse>


Please suggest.

Marco De Luca

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May 14, 2017, 5:36:41 PM5/14/17
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same exception on my kie-server, even using the suggested json, such as

{     "lookup":"ksession1",
      "commands":[
       
         {
            "fire-all-rules":""
         }
      ]}

Emmanuel Bonnet

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May 26, 2017, 10:45:00 AM5/26/17
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Hi guys,
I ran into exactly the same problem and it took me a while to understand it. Basically it all comes to this : you model must be perfectly serializable.
  • implement properly serializable for classes
  • If you have fancy stuff like enum with codes or whatever, annotated them with jackson properties for ex.

I had the same symptom and it disappeared when I solved that model issue.

Best,
Emmanuel

trying drools

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Aug 16, 2018, 6:00:45 PM8/16/18
to Drools Usage
Hi All,

I am also getting similar error.

"{
  "type" : "FAILURE",
  "msg" : "Error calling container drools_1.0.0: java.util.LinkedHashMap cannot be cast to org.kie.api.command.Command",
  "result" : null
}"

Please suggest.Thanks in advance.

Thanks,
Pradeep

Chris Taylor

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Sep 17, 2018, 3:39:53 PM9/17/18
to Drools Usage
Have you received or determined a resolution for this?

Chris Taylor

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Sep 19, 2018, 1:10:03 PM9/19/18
to Drools Usage
Not certain if all occurrences of the error "java.util.LinkedHashMap cannot be cast to org.kie.api.command.Command" when invoking rules over Rest/JSON API are the same cause, but in my case I believe it was due to some classloader issues. My project had Maven drools dependencies which I had to scope specifically as "provided" so my app did not build and provide them. This resolved the issue
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