Snakeyaml: Cannot create property for

I've a yaml fileto be passed as an argument to the java class. But it throws below exception:

Logs

Caused by: Cannot create property=heartbeatThreshold for JavaBean=UdsConfigurationBean{jdbcDriverClassString='org.mariadb.jdbc.Driver', sparkConfigFile='spark/spark-local.conf'}
 in 'reader', line 15, column 3:
      jdbcDriverClassString: org.maria ... 
      ^
Unable to find property 'heartbeatThreshold' on class: MyClass
 in 'reader', line 36, column 23:
      heartbeatThreshold: 60000000
                          ^

	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:292)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:171)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:230)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:219)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:269)
	... 12 more
Caused by: org.yaml.snakeyaml.error.YAMLException: Unable to find property 'heartbeatThreshold' on class: MyClass
	at org.yaml.snakeyaml.introspector.PropertyUtils.getProperty(PropertyUtils.java:159)
	at org.yaml.snakeyaml.introspector.PropertyUtils.getProperty(PropertyUtils.java:148)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.getProperty(Constructor.java:309)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:230)
	... 16 more

My Analysis:

1. MyClass is packaged as jar and it works for another project,so there should be problem with my yaml file.
2. Yaml validations has passed and seems all the variables are using camelCase.
3. As per my findings, PropertyUtils has 2 checks for this exception to be thrown, if property value is null(which it is not as per logs) and isWritable(I didn't get this part)
4. for jdbcDriverClassString, error indication is at name and for heartbeatThreshold value, its at value.

Can you please help me figure it out. I would be really grateful.

Yaml file:

kafka:
  kafkaServers: ${udsKafkaEpfConfigurationBean.kafka.kafkaServers}
  kafkaPrincipal: ${udsKafkaEpfConfigurationBean.kafka.kafkaPrincipal}
  kafkaKeytab: ${udsKafkaEpfConfigurationBean.kafka.kafkaKeytab}
  kafkaEnvironment: ${udsKafkaEpfConfigurationBean.kafka.kafkaEnvironment}
  

storage:
  jdbcDriverClassString: ${memsql.driver}   
  initializationStoresGeneration: true
  heartbeatThreshold: ${MyCLass.kafka.heartbeatThreshold}

For me, add Skip Missing Properties property to the yaml fixes the problem:

Yaml = new Yaml()

change to

Representer represent = new Representer()
represent.getPropertyUtils().setSkipMissingProperties(true)
Yaml yaml = new Yaml(represent)