AT:

• I can use the RuntimeService to get variables in their serialized format, e.g. the json representation in case I have a java object that is serialized by using the json default serialization
• I can use the RuntimeService/TaskService to set a variable by providing its serialized value (e.g. json), its corresponding java root type
• I can do the above actions in JavaDelegates via execution.getVariable(..) and execution.setVariable(..) (more generalized: everywhere in VariableScopes if possible)