Load parsing exception

This object will fail to load with exception:

---
tbl_test:
- ! 'Testtext'
- ! '!'
tbl_temp:
- value
- number

Here is exception:

Exception in thread "main" Can't construct a java object for tag:yaml.org,2002:yaml; exception=Class not found: yaml
 in 'string', line 4, column 3:
    - ! '!'
      ^

    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:336)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:230)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:219)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructSequenceStep2(BaseConstructor.java:390)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructSequence(BaseConstructor.java:374)
    at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlSeq.construct(SafeConstructor.java:534)
    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.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:479)
    at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:190)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:460)
    at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:556)
    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.BaseConstructor.constructDocument(BaseConstructor.java:173)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:157)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:490)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:416)

Code used:

Yaml yaml = new Yaml();
LinkedHashMap<String, ArrayList<Object>> data = yaml.load(str);

‌

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