[snakeyaml] How to hide bean type in snakeyaml?

Problem
I try to serialize a Java object into a YAML String, the expected YAML content looks like:

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intents: - greet - inform - others - question entities: - userid - is_account_locked - pass_company_check actions: - utter_default - utter_greet - confirm: dependency: slots: - userid - unlock: dependency: slots: - userid - is_account_locked

But the actual YAML content is:

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intents: - greet - inform - others - question entities: - userid - is_account_locked - pass_company_check actions: - utter_default - utter_greet - confirm: !!test.albert.snakeyaml.SnakeYamlTest$ActionAttribute dependency: slots: - userid - unlock: !!test.albert.snakeyaml.SnakeYamlTest$ActionAttribute dependency: slots: - userid - is_account_locked

How to hide bean type in snakeyaml?


Here has sample code:

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package test.albert.snakeyaml; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Map; import org.yaml.snakeyaml.DumperOptions; import org.yaml.snakeyaml.Yaml; import org.yaml.snakeyaml.representer.Representer; import lombok.AllArgsConstructor; import lombok.Data; import lombok.extern.slf4j.Slf4j; @Slf4j public class SnakeYamlTest { public static void main(String[] args) { // Set DumperOptions options DumperOptions options = new DumperOptions(); options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK); options.setPrettyFlow(true); // Create Yaml instance with DumperOptions Yaml yaml = new Yaml(options); // Prepare map data for YAML Map<String, Object> actionMap1 = new HashMap<>(); actionMap1.put("confirm", new ActionAttribute(new Dependency(Arrays.asList("userid")))); Map<String, Object> actionMap2 = new HashMap<>(); actionMap2.put("unlock", new ActionAttribute(new Dependency(Arrays.asList("userid", "is_account_locked")))); Map<String, Object> map = new HashMap<>(); map.put("intents", Arrays.asList("greet", "inform", "others", "question")); map.put("entities", Arrays.asList("userid", "is_account_locked", "pass_company_check")); map.put("actions", Arrays.asList("utter_default", "utter_greet", actionMap1, actionMap2)); // Serialize a Java object into a YAML String String output = yaml.dump(map); log.info("\n" + output); } @Data @AllArgsConstructor private static class ActionAttribute { Dependency dependency; } @Data @AllArgsConstructor private static class Dependency { private List<String> slots; } }

How-To
Here has updated source code:

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package test.albert.snakeyaml; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Map; import org.yaml.snakeyaml.DumperOptions; import org.yaml.snakeyaml.Yaml; import org.yaml.snakeyaml.nodes.Tag; import org.yaml.snakeyaml.representer.Representer; import lombok.AllArgsConstructor; import lombok.Data; import lombok.extern.slf4j.Slf4j; @Slf4j public class SnakeYamlTest { public static void main(String[] args) { // Set DumperOptions options DumperOptions options = new DumperOptions(); options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK); options.setPrettyFlow(true); // overwrite Representer Representer representer = new Representer(); representer.addClassTag(ActionAttribute.class, Tag.MAP); // Create Yaml instance with Representer and DumperOptions Yaml yaml = new Yaml(representer, options); // Prepare map data for YAML Map<String, Object> actionMap1 = new HashMap<>(); actionMap1.put("confirm", new ActionAttribute(new Dependency(Arrays.asList("userid")))); Map<String, Object> actionMap2 = new HashMap<>(); actionMap2.put("unlock", new ActionAttribute(new Dependency(Arrays.asList("userid", "is_account_locked")))); Map<String, Object> map = new HashMap<>(); map.put("intents", Arrays.asList("greet", "inform", "others", "question")); map.put("entities", Arrays.asList("userid", "is_account_locked", "pass_company_check")); map.put("actions", Arrays.asList("utter_default", "utter_greet", actionMap1, actionMap2)); // Serialize a Java object into a YAML String String output = yaml.dump(map); log.info("\n" + output); } @Data @AllArgsConstructor private static class ActionAttribute { Dependency dependency; } @Data @AllArgsConstructor private static class Dependency { private List<String> slots; } }