JSON Object serialization failed

[Ingo Richtsmeier]

Hi,

I try to save my result from the business rules task as a JSON object, but it fails with this exception:

org.camunda.bpm.engine.ProcessEngineException: Cannot find serializer for value 'Untyped value 'DroolsCountry(name=Nigeria, hint=counterparty is in a high risk country, highRisk=true)''.

at org.camunda.bpm.engine.impl.variable.serializer.DefaultVariableSerializers.findSerializerForValue(DefaultVariableSerializers.java:69)

at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.setValue(VariableInstanceEntity.java:264)

This is the most important code from my delegate class:

Class<?> clazz = Class.forName(factClassName);

Object country = clazz.newInstance();

Field setName = clazz.getDeclaredField("name");

setName.setAccessible(true);

setName.set(country, countryName);

// DroolsCountry droolsCountry = new DroolsCountry();

// droolsCountry.setName((String) countryName);

StatefulKnowledgeSession workingMemory = createWorkingMemory(decisionTablePath);

workingMemory.insert(country);

// workingMemory.insert(droolsCountry);

int numberOfRules = workingMemory.fireAllRules();

log.info("Number of Rules fired from the decisionTable " + decisionTablePath + ": " + numberOfRules);

// ObjectValue typedDroolsCountry =

//  Variables.objectValue(country)

//  .serializationDataFormat("application/json")

//  .create();

// log.info("object type name: " + typedDroolsCountry.getObjectTypeName());

// execution.setVariable("droolsCountry", typedDroolsCountry);

// execution.setVariable("droolsCountry", droolsCountry);

execution.setVariable("droolsCountry", country);

I even played around with typed Objects without reflection, but I get the same exception.

The default serialization format is set in process engine plugin:

log.info("set default serialzation to JSON");

processEngineConfiguration.setDefaultSerializationFormat("application/json");

log.info("default serialization format now " + processEngineConfiguration.getDefaultSerializationFormat());

What is missing?

Regards, Ingo

[Melissa Palmer]

Hi Ingo 

Did you try including Camunda Spin? 

See http://docs.camunda.org/latest/guides/user-guide/#process-engine-process-variables search for "Object Value Serialization" you'll see the following info: 

Serializing Objects to XML and JSON:

The camunda Spin plugin provides serializers that are capable of serializing object values to XML and JSON. They can be used when it is desired that the serialized objects values can be interpreted by humans or when the serialized value should be meaningful without having the corresponding Java class.

When using a pre-built camunda distribution, camunda Spin is already preconfigured and you can try these formats without further configuration.

You might need to go through the steps at: http://docs.camunda.org/latest/guides/user-guide/#data-formats-xml-json-other-configuring-spin-integration 

Cheers

Melissa

[Ingo Richtsmeier]

Hi Melissa,

 

Yes, my pom.xml has the dependencies for spin.

 

   

       <dependency>

             <groupId>org.camunda.spin</groupId>

             <artifactId>camunda-spin-core</artifactId>

             <version>1.0.1</version>

             <scope>provided</scope>

       </dependency>

       <dependency>

             <groupId>org.camunda.spin</groupId>

             <artifactId>camunda-spin-dataformat-json-jackson</artifactId>

             <version>1.0.1</version>

             <scope>provided</scope>

       </dependency>

       <dependency>

             <groupId>org.camunda.bpm</groupId>

             <artifactId>camunda-engine-plugin-spin</artifactId>

             <version>${camunda.version}</version>

             <scope>provided</scope>

       </dependency>

      

Any special library missing?

 

Regards, Ingo

 

 

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[thorben....@camunda.com]

Hi Ingo,

Did you also register the spin engine plugin as described in the user guide linked by Melissa?

What is your deployment scenario? Does this fail within a unit test or when you deploy it to an application server with a shared engine? If the latter is the case, did you make sure the Spin libraries are in the engine's classpath, e.g. on Tomat in the global lib folder (as described in [1] and analogous for the other servers in their respective installation guides)?

If it is none of the above, would you be able to provide a failing test case?

Thanks and best regards,
Thorben

[1] http://docs.camunda.org/latest/guides/installation-guide/tomcat/#bpm-platform-install-optional-camunda-dependencies-install-camunda-spin

[Ingo Richtsmeier]

Thank you, I missed the plugin registration in my camunda.cfg.xml for the unit test.

Now the tests are fine.

Regards, Ingo