Parsing yaml using jackson databind causes MismatchedInputException












0















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?






java jackson yaml fasterxml







share|improve this question



























    0















    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?






    java jackson yaml fasterxml







    share|improve this question

























      0












      0








      0








      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?






      java jackson yaml fasterxml







      share|improve this question














      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?






      java jackson yaml fasterxml




      java jackson yaml fasterxml






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 20 '18 at 4:56









      kbangkbang

      372421




      372421
























          1 Answer
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          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






          share|improve this answer


























          • Duh!... thanks for looking into this.

            – kbang
            Nov 20 '18 at 7:57











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          active

          oldest

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          0














          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






          share|improve this answer


























          • Duh!... thanks for looking into this.

            – kbang
            Nov 20 '18 at 7:57
















          0














          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






          share|improve this answer


























          • Duh!... thanks for looking into this.

            – kbang
            Nov 20 '18 at 7:57














          0












          0








          0







          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






          share|improve this answer















          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







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 20 '18 at 5:20

























          answered Nov 20 '18 at 5:08









          Ruwanka MadhushanRuwanka Madhushan

          1,58232036




          1,58232036













          • Duh!... thanks for looking into this.

            – kbang
            Nov 20 '18 at 7:57



















          • Duh!... thanks for looking into this.

            – kbang
            Nov 20 '18 at 7:57

















          Duh!... thanks for looking into this.

          – kbang
          Nov 20 '18 at 7:57





          Duh!... thanks for looking into this.

          – kbang
          Nov 20 '18 at 7:57


















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