How can I store a complex type in Java? Using JSON Spin, get error 'Cannot find serializer for value null'

Environment (Required on creation):

Java tomcat

 

Description (Required on creation; please attach any relevant screenshots, stacktraces, log files, etc. to the ticket):

 

Basically what I am trying to do is store a complex type (containing like 6 name, value pairs) in a variable in the database and retrieve them later.

 

I'm trying to write a JSON object as a string into a SpinValue and getting an error when setting the variable.

Here's my code:

==============================================
String json = "{\"name\" : \"jonny\","
+ "\"address\" :

{" + "\"street\" : \"12 High Street\"," + "\"post code\" : 1234" + "}

"
+ "}";

JsonValue jsonValue = SpinValues.jsonValue(json).create();

execution.setVariable("customerJonny", jsonValue);

=============================================

 

It throws this exception:

org.camunda.bpm.engine.ProcessEngineException: Cannot find serializer for value 'Value 'null' of type 'json', isTransient=false'.org.camunda.bpm.engine.ProcessEngineException: Cannot find serializer for value 'Value 'null' of type 'json', isTransient=false'. at org.camunda.bpm.engine.impl.variable.serializer.DefaultVariableSerializers.findSerializerForValue(DefaultVariableSerializers.java:88) at org.camunda.bpm.engine.impl.persistence.entity.util.TypedValueField.setValue(TypedValueField.java:122) at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.<init>(VariableInstanceEntity.java:129) at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.create(VariableInstanceEntity.java:148) at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntityFactory.build(VariableInstanceEntityFactory.java:31) at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntityFactory.build(VariableInstanceEntityFactory.java:25) at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariableLocal(AbstractVariableScope.java:369) at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:342) at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:335) at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:310) at jpl.cws.engine.CwsEngineProcessApplication$2.notify(CwsEngineProcessApplication.java:442)

 

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