Just
use [] to define an empty array.
Example
emptyArray: []Employee.java
package com.sample.model; import java.util.Arrays; public class Employee { private int id; private String firstName; private String lastName; private String[] hobbies; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String[] getHobbies() { return hobbies; } public void setHobbies(String[] hobbies) { this.hobbies = hobbies; } @Override public String toString() { return "Employee [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", hobbies=" + Arrays.toString(hobbies) + "]"; } }
YAMLUtil.java
package com.sample.util; import java.io.IOException; import java.util.ArrayList; import java.util.List; import com.fasterxml.jackson.core.JsonGenerationException; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.type.CollectionType; import com.fasterxml.jackson.dataformat.yaml.YAMLFactory; public class YAMLUtil { private static ObjectMapper mapper = new ObjectMapper(new YAMLFactory()); public static void printYAML(Object obj) throws JsonGenerationException, JsonMappingException, IOException { mapper.writeValue(System.out, obj); } public static <T> T getObject(String yaml, Class<T> clazz) throws JsonParseException, JsonMappingException, IOException { return mapper.readValue(yaml, clazz); } public static <T> List<T> getListOfObjects(String yaml, Class<T> clazz) throws JsonParseException, JsonMappingException, IOException { CollectionType listType = mapper.getTypeFactory().constructCollectionType(ArrayList.class, clazz); List<T> ts = mapper.readValue(yaml, listType); return ts; } }
Test.java
package com.sample.app; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Paths; import com.fasterxml.jackson.core.JsonGenerationException; import com.fasterxml.jackson.databind.JsonMappingException; import com.sample.model.Employee; import com.sample.util.YAMLUtil; public class Test { private static final String filePath = "C:\\Users\\krishna\\Documents\\Study\\YAML\\yaml files\\employee.yml"; public static void main(String args[]) throws JsonGenerationException, JsonMappingException, IOException { String fileString = new String(Files.readAllBytes(Paths.get(filePath)), StandardCharsets.UTF_8); Employee emp = YAMLUtil.getObject(fileString, Employee.class); System.out.println(emp); } }
Output
Employee [id=1, firstName=Krishna, lastName=Gurram, hobbies=[]]
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