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There is a newer version: 7.9.0
public static class Builder {{#parentModel}}extends {{classname}}.Builder {{/parentModel}}{

    private {{classname}} instance;

    public Builder() {
      this(new {{classname}}());
    }

    protected Builder({{classname}} instance) {
    {{#parentModel}}
      super(instance);
    {{/parentModel}}
      this.instance = instance;
    }

    {{#vars}}
    public {{classname}}.Builder {{name}}({{{datatypeWithEnum}}} {{name}}) {
    {{#vendorExtensions.x-is-jackson-optional-nullable}}
      this.instance.{{name}} = JsonNullable.<{{{datatypeWithEnum}}}>of({{name}});
    {{/vendorExtensions.x-is-jackson-optional-nullable}}
    {{^vendorExtensions.x-is-jackson-optional-nullable}}
      this.instance.{{name}} = {{name}};
    {{/vendorExtensions.x-is-jackson-optional-nullable}}
      return this;
    }
    {{#vendorExtensions.x-is-jackson-optional-nullable}}
    public {{classname}}.Builder {{name}}(JsonNullable<{{{datatypeWithEnum}}}> {{name}}) {
      this.instance.{{name}} = {{name}};
      return this;
    }
    {{/vendorExtensions.x-is-jackson-optional-nullable}}
    {{/vars}}

{{#parentVars}}
    public {{classname}}.Builder {{name}}({{{datatypeWithEnum}}} {{name}}) { // inherited: {{isInherited}}
      super.{{name}}({{name}});
      return this;
   }
    {{#vendorExtensions.x-is-jackson-optional-nullable}}
    public {{classname}}.Builder {{name}}(JsonNullable<{{{datatypeWithEnum}}}> {{name}}) {
      this.instance.{{name}} = {{name}};
      return this;
    }
    {{/vendorExtensions.x-is-jackson-optional-nullable}}

    {{/parentVars}}

    /**
    * returns a built {{classname}} instance.
    *
    * The builder is not reusable.
    */
    public {{classname}} build() {
      try {
        return this.instance;
      } finally {
        // ensure that this.instance is not reused{{#parentModel}}
        super.build();{{/parentModel}}
        this.instance = null;
      }
    }

    @Override
    public String toString() {
      return getClass() + "=(" + instance + ")";
    }
  }

  /**
  * Create a builder with no initialized field.
  */
  public static {{classname}}.Builder builder() {
    return new {{classname}}.Builder();
  }

  /**
  * Create a builder with a shallow copy of this instance.
  */
  public {{classname}}.Builder toBuilder() {
    return new {{classname}}.Builder(){{#allVars}}
      .{{name}}({{getter}}()){{/allVars}};
  }