Cannot deserialize object in variable 'test1': SPIN/JACKSON-JSON-01007 Cannot construct java type from string 'java.util.ArrayList<groovy.sql.GroovyRowResult<java.lang.Object,java.lang.Object>>'

Camunda 7 Topics Discussion & Questions
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@Ali_Titan For deserialization, you should have the below class in camunda classpath.

com.camunda.demo.test.PersonnelModel

Serialization:

ObjectValue typedObjectValue = Variables
  .objectValue(order)
  .serializationDataFormat(Variables.SerializationDataFormats.JAVA)
  .create();

Access serialized properties:

// returns true
boolean isDeserialized = retrievedTypedObjectValue.isDeserialized();

// returns the format used by the engine to serialize the value into the database
String serializationDataFormat = retrievedTypedObjectValue.getSerializationDateFormat();

// returns the serialized representation of the variable; the actual value depends on the serialization format used
String serializedValue = retrievedTypedObjectValue.getValueSerialized();

// returns the class com.example.Order
Class<com.example.Order> valueClass = retrievedTypedObjectValue.getObjectType();

// returns the String "com.example.Order"
String valueClassName = retrievedTypedObjectValue.getObjectTypeName();

Deserialization:

String serializedOrder = "...";
ObjectValue serializedValue =
  Variables
    .serializedObjectValue(serializedOrder)
    .serializationDataFormat(Variables.SerializationDataFormats.JAVA)
    .objectTypeName("com.example.Order")
    .create();

runtimeService.setVariableLocal(execution.getId(), "order", serializedValue);

ObjectValue retrievedTypedObjectValue = runtimeService.getVariableTyped(execution.getId(), "order");
com.example.Order retrievedOrder = (com.example.Order) retrievedTypedObjectValue.getValue();

Read about Serializing Process Variables

Custom Java objects can be serialized with the value type object:
https://docs.camunda.org/manual/latest/user-guide/process-engine/variables/#object-values

Object Value Serialization:
https://docs.camunda.org/manual/latest/user-guide/process-engine/variables/#object-value-serialization