Find entity in jpa by primary key

Use the find method of the EntityManager, where the primary key is provided as the second parameter:

public class PartnerRepository {

  @Inject private EntityManager em;

  public Optional<Partner> find(String partnerNumber) {
    return Optional.ofNullable(em.find(Partner.class, partnerNumber));

The entity looks something like the following, with partnerNumber as primary key:

@Table(name = "T_PARTNER")
public class Partner {

  @Column(name = "PARTNER_NUMBER", nullable = false)
  private Integer partnerNumer;

  //other fields ignored for readability

Shared with from 👉 Use the Copy to mine functionality to copy this snippet to your own personal collection and easy manage your code snippets.

Subscribe to our newsletter for more code resources and news

Adrian Matei

Adrian Matei
Life force expressing itself as a coding capable human being

Default value for jax-rs query parameter

Default value for jax-rs query parameter code snippet Continue reading

Unmarshalling xml string to java object with JAXB

Published on February 20, 2022

Execute delete statement with jpa query

Published on February 19, 2022