SomeClass.java

package com.hubspot;

import java.io.Serializable;
import java.util.Objects;

public class SomeClass implements Serializable {
  private final long id;
  private final String name;

  private SomeClass(long id, String name) {
    this.id = id;
    this.name = name;
  }

  public static Builder builder() {
    return new Builder();
  }

  public long getId() {
    return id;
  }

  public String getName() {
    return name;
  }

  public static final class Builder {
    private Long id = null;
    private String name = null;

    private Builder() {}

    public Builder setId(Long id) {
      this.id = id;
      return this;
    }

    public Builder setName(String name) {
      this.name = name;
      return this;
    }

    public SomeClass build() {
      Objects.requireNonNull(id, "id");
      Objects.requireNonNull(name, "name");
      return new SomeClass(id, name);
    }
  }
}