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Editorial Team
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Asked: 2026-06-13T11:10:14+00:00

I am trying to port to YABE in play1.2.4 to play 2.0.4 Java. For

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I am trying to port to YABE in play1.2.4 to play 2.0.4 Java. For that I created a initial-data.yml and tried to load it with Global.java

#Users
users:
    - !!models.User
        email:      bob@gmail.com
        password:   secret
        fullname:   Bob
        isAdmin:    true
#Posts

posts:

    - !!models.Post
        id:         1
        title:      About the model layer
        postedAt:   2009-06-14
        author:     
            - !!models.User
                email: bob@gmail.com
        content:    >
                    The model has a central position in a Play! application. Cut....

My Global.java is below

public void onStart(Application app) {
        InitialData.insert(app);
    }

    static class InitialData {
        public static void insert(Application app) {
            if(Ebean.find(User.class).findRowCount() == 0) {
                Map<String, List<Object>> all = (Map<String, List<Object>>)Yaml.load("initial-data.yml");
                Ebean.save(all.get("users"));
                Ebean.save(all.get("posts"));
                Ebean.save(all.get("comments"));
            }
        }
    }

While loading I am getting following errors

ConstructorException: null; Can’t construct a java object for tag:yaml.org,2002:models.Post; exception=Cannot create property=author for JavaBean=models.Post@1; No suitable constructor with 3 arguments found for class models.User 

org.yaml.snakeyaml.constructor.ConstructorException: null; Can't construct a java object for tag:yaml.org,2002:models.Post; exception=Cannot create property=author for JavaBean=models.Post@1; No suitable constructor with 3 arguments found for class models.User

     org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:333)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructSequenceStep2(BaseConstructor.java:277)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructSequence(BaseConstructor.java:248)

     org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlSeq.construct(SafeConstructor.java:440)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:326)

     org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:143)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:307)

     org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:459)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)

     org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:142)

     org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:128)

     org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)

     org.yaml.snakeyaml.Yaml.load(Yaml.java:411)

Any Idea why this happens?

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1 Answer

  1. Editorial Team

    Manuel, Thanks for the help.

    When I slightly modified the YAML i got it working, I just removed the “-“, which is in front of the “model.class” 

    #Users
users:
    - !!models.User
        email:      bob@gmail.com
        password:   secret
        fullname:   Bob
        isAdmin:    true
#Posts

posts:

    - !!models.Post
        id:         1
        title:      About the model layer
        postedAt:   2009-06-14
        author: !!models.User
                email: bob@gmail.com
        content:    >
                    The model has a central position in a Play! application. Cut....

    Any idea what “-” stands for?

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