Add includeNoArgsConstructor option

jsonschema2pojo-ant/src/main/java/org/jsonschema2pojo/ant/Jsonschema2PojoTask.java

@@ -153,6 +153,8 @@ public class Jsonschema2PojoTask extends Task implements GenerationConfig {
 
  boolean includeCopyConstructor = false;
 
+ boolean includeNoArgsConstructor = true;
+
  private boolean includeAdditionalProperties = true;
 
  private boolean includeGetters = true;
@@ -192,7 +194,7 @@ public class Jsonschema2PojoTask extends Task implements GenerationConfig {
  private SourceSortOrder sourceSortOrder = SourceSortOrder.OS;
 
  private Map<String, String> formatTypeMapping = new HashMap<>();
- 
+
  private boolean includeGeneratedAnnotation = true;
 
  private boolean useJakartaValidation = false;
@@ -342,6 +344,20 @@ public void setIncludeCopyConstructor(boolean includeCopyConstructor) {
  this.includeCopyConstructor = includeCopyConstructor;
  }
 
+ /**
+ * Sets the 'includeNoArgsConstructor' configuration option. This property works in collaboration with the {@link
+ * #isIncludeConstructors()} configuration option, and will have no effect if {@link #isIncludeConstructors()}
+ * is not set to true. If {@link #isIncludeConstructors()} is set to true then this configuration determines
+ * whether the resulting object should include the no-args constructor. This option is compatible with any
+ * of the other constructor related options, but will be ignored if no other constructor is to be generated -
+ * this is because java will always infer the no-args constructor if no other constructors are present.
+ *
+ * @param includeNoArgsConstructor controls whether the resulting class will include the no-args constructor
+ */
+ public void setIncludeNoArgsConstructor(boolean includeNoArgsConstructor) {
+ this.includeNoArgsConstructor = includeNoArgsConstructor;
+ }
+
  /**
  * Sets the 'generateBuilders' property of this class.
  *
@@ -1209,6 +1225,11 @@ public boolean isIncludeCopyConstructor() {
  return includeCopyConstructor;
  }
 
+ @Override
+ public boolean isIncludeNoArgsConstructor() {
+ return includeNoArgsConstructor;
+ }
+
  @Override
  public boolean isIncludeAdditionalProperties() {
  return includeAdditionalProperties;
@@ -1313,7 +1334,7 @@ public String getRefFragmentPathDelimiters() {
  public SourceSortOrder getSourceSortOrder() {
  return sourceSortOrder;
  }
- 
+
  @Override
  public Map<String, String> getFormatTypeMapping() {
  return formatTypeMapping;

jsonschema2pojo-ant/src/site/Jsonschema2PojoTask.html

@@ -285,6 +285,19 @@ <h3>Parameters</h3>
  </td>
  <td align="center" valign="top">No (default <code>false</code>)</td>
  </tr>
+ <tr>
+ <td valign="top">includeNoArgsConstructor</td>
+ <td valign="top">The 'includeNoArgsConstructor' configuration option
+ works in collaboration with the {@link #isIncludeConstructors()} configuration option and is
+ incompatible with {@link #isConstructorsRequiredPropertiesOnly()}, and will have no effect if
+ {@link #isIncludeConstructors()} is not set to true. If {@link #isIncludeConstructors()} is
+ set to true then this configuration determines whether the resulting object should include the
+ no-args constructor. This option is compatible with any of the other constructor related options,
+ but will be ignored if no other constructor is to be generated - this is because java will
+ always infer the no-args constructor if no other constructors are present.
+ </td>
+ <td align="center" valign="top">No (default <code>true</code>)</td>
+ </tr>
  <tr>
  <td valign="top">includeHashcodeAndEquals</td>
  <td valign="top">Whether to use include <code>hashCode</code> and <code>equals</code> methods in

jsonschema2pojo-cli/src/main/java/org/jsonschema2pojo/cli/Arguments.java

@@ -89,6 +89,9 @@ public class Arguments implements GenerationConfig {
  @Parameter(names = { "--constructors-include-copy-constructor" }, description = "Generate constructors with a copy oriented parameter")
  private boolean includeCopyConstructor = false;
 
+ @Parameter(names = { "--constructors-include-no-args-constructor" }, description = "Generate constructor with no arguments")
+ private boolean includeNoArgsConstructor = false;
+
  @Parameter(names = { "-P", "--use-primitives" }, description = "Use primitives instead of wrapper types for bean properties")
  private boolean usePrimitives = false;
 
@@ -503,6 +506,9 @@ public boolean isPrintLogLevels() {
  @Override
  public boolean isIncludeCopyConstructor() { return includeCopyConstructor; }
 
+ @Override
+ public boolean isIncludeNoArgsConstructor() { return includeNoArgsConstructor; }
+
  @Override
  public boolean isIncludeAdditionalProperties() {
  return isIncludeAdditionalProperties;

jsonschema2pojo-core/src/main/java/org/jsonschema2pojo/DefaultGenerationConfig.java

@@ -324,6 +324,12 @@ public boolean isConstructorsRequiredPropertiesOnly() {
  @Override
  public boolean isIncludeCopyConstructor() { return false; }
 
+ /**
+ * @return <code>true</code>
+ */
+ @Override
+ public boolean isIncludeNoArgsConstructor() { return true; }
+
  /**
  * @return <code>true</code>
  */

jsonschema2pojo-core/src/main/java/org/jsonschema2pojo/GenerationConfig.java

@@ -416,6 +416,18 @@ public interface GenerationConfig {
  */
  boolean isIncludeCopyConstructor();
 
+ /**
+ * Gets the 'includeNoArgsConstructor' configuration option. This property works in collaboration with the {@link
+ * #isIncludeConstructors()} configuration option, and will have no effect if {@link #isIncludeConstructors()}
+ * is not set to true. If {@link #isIncludeConstructors()} is set to true then this configuration determines
+ * whether the resulting object should include the default constructor. This option is compatible with any
+ * of the other constructor related options, but will be ignored if no other constructor is to be generated -
+ * this is because java will always infer the default constructor if no other constructors are present.
+ *
+ * @return whether the resulting object should not include the default a constructor.
+ */
+ boolean isIncludeNoArgsConstructor();
+
  /**
  * Gets the 'includeAdditionalProperties' configuration option.
  *

jsonschema2pojo-core/src/main/java/org/jsonschema2pojo/rules/ConstructorRule.java

@@ -81,10 +81,14 @@ private void handleLegacyConfiguration(JsonNode node, JDefinedClass instanceClas
 
  // Only generate the constructors if there are actually properties to put in them
  if (!requiredClassProperties.isEmpty() || !requiredCombinedSuperProperties.isEmpty()) {
+ final GenerationConfig generationConfig = ruleFactory.getGenerationConfig();
 
- // Generate the no arguments constructor - we'll need this even if there is a property
- // constructor available, because it is used by the serialization and deserialization
- generateNoArgsConstructor(instanceClass);
+ // If there are no properties to put on the constructor than we don't need
+ // the no-args constructor as java infers it, so we can make this computation
+ // only if the required properties constructor is being generated
+ if (generationConfig.isIncludeNoArgsConstructor()) {
+ generateNoArgsConstructor(instanceClass);
+ }
 
  // Generate the actual constructor taking in only the required properties
  addFieldsConstructor(instanceClass, requiredClassProperties, requiredCombinedSuperProperties);
@@ -125,9 +129,12 @@ private void handleMultiChoiceConstructorConfiguration(JsonNode node, JDefinedCl
 
  // Only generate the constructors if there are actually properties to put in them
  if (requiresConstructors) {
- // Generate the no arguments constructor - we'll need this even if there is a property
- // constructor available, because it is used by the serialization and deserialization
- generateNoArgsConstructor(instanceClass);
+ // If there are no other constructors to generate then the no-args constructor is
+ // not needed as java infers it, so we can make this computation only if the required
+ // properties constructor is being generated
+ if (generationConfig.isIncludeNoArgsConstructor()) {
+ generateNoArgsConstructor(instanceClass);
+ }
 
  if (includeCopyConstructor) {
  addCopyConstructor(instanceClass, classProperties, combinedSuperProperties);

jsonschema2pojo-gradle-plugin/README.md

@@ -229,6 +229,9 @@ jsonSchema2Pojo {
  // This property is irrelevant if constructorsRequiredPropertiesOnly = true
  includeCopyConstructor = false
 
+ // Whether to *add* the no-args constructor, alongside other constructors.
+ includeNoArgsConstructor = false
+
  // Whether to make the generated types Parcelable for Android
  parcelable = false
 

jsonschema2pojo-gradle-plugin/src/main/groovy/org/jsonschema2pojo/gradle/JsonSchemaExtension.groovy

@@ -60,6 +60,7 @@ public class JsonSchemaExtension implements GenerationConfig {
  boolean includeRequiredPropertiesConstructor;
  boolean includeAllPropertiesConstructor;
  boolean includeCopyConstructor;
+ boolean includeNoArgsConstructor;
  boolean includeHashcodeAndEquals
  boolean includeJsr303Annotations
  boolean includeJsr305Annotations
@@ -117,6 +118,7 @@ public class JsonSchemaExtension implements GenerationConfig {
  constructorsRequiredPropertiesOnly = false
  includeRequiredPropertiesConstructor = false
  includeAllPropertiesConstructor = true
+ includeNoArgsConstructor = true
  includeToString = true
  toStringExcludes = [] as String[]
  annotationStyle = AnnotationStyle.JACKSON
@@ -247,6 +249,7 @@ public class JsonSchemaExtension implements GenerationConfig {
  |includeRequiredPropertiesConstructor = ${includeRequiredPropertiesConstructor}
  |includeAllPropertiesConstructor = ${includeAllPropertiesConstructor}
  |includeCopyConstructor = ${includeCopyConstructor}
+ |includeNoArgsConstructor = ${includeNoArgsConstructor}
  |includeToString = ${includeToString}
  |toStringExcludes = ${Arrays.toString(toStringExcludes)}
  |annotationStyle = ${annotationStyle.toString().toLowerCase()}