Parsing yaml using jackson databind causes MismatchedInputException

The format of yaml I am trying to read is as follows

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

My model is simple

public class Requirementsyml {

    //setter and getter in place

    private List<Requirement> items;

}



public class Requirement {

    private String name;

    private String scm;

    private String src;

    private String version;

}

I am trying to read the yaml contents as follows:

ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

Requirementsyml req = mapper.readValue(yaml_file_content, Requirementsyml.class);

However I am getting the following exception
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of Requirementsyml out of START_ARRAY token

Since the model has a list I think the input should not be mismatched.
I tried to provide yaml file as a java file object, instead of its content as string. The result remains the same. What am I missing?

asked Nov 20 at 4:56

kbang

372421

add a comment |

The format of yaml I am trying to read is as follows

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

My model is simple

public class Requirementsyml {

    //setter and getter in place

    private List<Requirement> items;

}



public class Requirement {

    private String name;

    private String scm;

    private String src;

    private String version;

}

I am trying to read the yaml contents as follows:

ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

Requirementsyml req = mapper.readValue(yaml_file_content, Requirementsyml.class);

However I am getting the following exception
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of Requirementsyml out of START_ARRAY token

asked Nov 20 at 4:56

kbang

372421

add a comment |

The format of yaml I am trying to read is as follows

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

My model is simple

public class Requirementsyml {

    //setter and getter in place

    private List<Requirement> items;

}



public class Requirement {

    private String name;

    private String scm;

    private String src;

    private String version;

}

I am trying to read the yaml contents as follows:

ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

Requirementsyml req = mapper.readValue(yaml_file_content, Requirementsyml.class);

However I am getting the following exception
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of Requirementsyml out of START_ARRAY token

asked Nov 20 at 4:56

kbang

372421

The format of yaml I am trying to read is as follows

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

My model is simple

public class Requirementsyml {

    //setter and getter in place

    private List<Requirement> items;

}



public class Requirement {

    private String name;

    private String scm;

    private String src;

    private String version;

}

I am trying to read the yaml contents as follows:

ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

Requirementsyml req = mapper.readValue(yaml_file_content, Requirementsyml.class);

However I am getting the following exception
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of Requirementsyml out of START_ARRAY token

java jackson yaml fasterxml

asked Nov 20 at 4:56

kbang

372421

asked Nov 20 at 4:56

kbang

372421

asked Nov 20 at 4:56

kbang

372421

asked Nov 20 at 4:56

kbang

372421

asked Nov 20 at 4:56

kbang

372421

add a comment |

1 Answer
1

active

oldest

votes

yaml structure should be having items array/list

items:

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

or else you can read it as list of requirements with no change to yaml

@Test

void test() throws IOException {

    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

    List<Requirement> requirements = mapper.readValue(new File("src/test/resources/requirements.yml"), new TypeReference<List<Requirement>>() {});

    assertEquals(2, requirements.size());

}

also make sure Requirement and other class has no args constructor, otherwise set appropriate flags on ObjectMapper

edited Nov 20 at 5:20

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

Duh!... thanks for looking into this.
– kbang
Nov 20 at 7:57

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

yaml structure should be having items array/list

items:

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

or else you can read it as list of requirements with no change to yaml

@Test

void test() throws IOException {

    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

    List<Requirement> requirements = mapper.readValue(new File("src/test/resources/requirements.yml"), new TypeReference<List<Requirement>>() {});

    assertEquals(2, requirements.size());

}

also make sure Requirement and other class has no args constructor, otherwise set appropriate flags on ObjectMapper

edited Nov 20 at 5:20

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

Duh!... thanks for looking into this.
– kbang
Nov 20 at 7:57

add a comment |

yaml structure should be having items array/list

items:

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

or else you can read it as list of requirements with no change to yaml

@Test

void test() throws IOException {

    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

    List<Requirement> requirements = mapper.readValue(new File("src/test/resources/requirements.yml"), new TypeReference<List<Requirement>>() {});

    assertEquals(2, requirements.size());

}

also make sure Requirement and other class has no args constructor, otherwise set appropriate flags on ObjectMapper

edited Nov 20 at 5:20

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

Duh!... thanks for looking into this.
– kbang
Nov 20 at 7:57

add a comment |

yaml structure should be having items array/list

items:

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

or else you can read it as list of requirements with no change to yaml

@Test

void test() throws IOException {

    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

    List<Requirement> requirements = mapper.readValue(new File("src/test/resources/requirements.yml"), new TypeReference<List<Requirement>>() {});

    assertEquals(2, requirements.size());

}

also make sure Requirement and other class has no args constructor, otherwise set appropriate flags on ObjectMapper

edited Nov 20 at 5:20

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

yaml structure should be having items array/list

items:

- name: storage

  scm: git

  src: git+https://bitbucket.org/cer/linux_storage_jenkins.git

  version: '5'

- name: linux_jenkins

  scm: git

  src: git+https://bitbucket.org/cer/linux_jenkins.git

  version: '8'

or else you can read it as list of requirements with no change to yaml

@Test

void test() throws IOException {

    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

    List<Requirement> requirements = mapper.readValue(new File("src/test/resources/requirements.yml"), new TypeReference<List<Requirement>>() {});

    assertEquals(2, requirements.size());

}

also make sure Requirement and other class has no args constructor, otherwise set appropriate flags on ObjectMapper

edited Nov 20 at 5:20

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

edited Nov 20 at 5:20

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

answered Nov 20 at 5:08

Ruwanka Madhushan

1,57032036

Duh!... thanks for looking into this.
– kbang
Nov 20 at 7:57

add a comment |

Duh!... thanks for looking into this.
– kbang
Nov 20 at 7:57

Duh!... thanks for looking into this.
– kbang
Nov 20 at 7:57

add a comment |

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