org.hibernate.LazyInitializationException: could not initialize proxy - no Session

I want to use to hibernate level2 cache as flow config.

@Getter @Entity public class Personnel{ @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @Column private String name; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; private String name; @ManyToOne(fetch = FetchType.LAZY) private Post post; }

Now for get object at the first time, all things are ok! (that means I want to load ‘post’ from personnel) But when I call this function for a second time, in my personnel object the ‘post’ is null and I get an error as below:

Caused by: java.lang.reflect.InvocationTargetException: null at sun.reflect.GeneratedMethodAccessor167.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.dozer.util.ReflectionUtils.invoke(ReflectionUtils.java:323) ... 132 common frames omitted Caused by: org.hibernate.LazyInitializationException: could not initialize proxy - no Session at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:146) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:259) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:73) at org.model.core.Post_$$_jvstb54_2a.getId(Post_$$_jvstb54_2a.java)

Hibernate 5.2 Radisson 3.12.5 spring-boot 2.1.1

[siedmohsen2]

thanks It works very fine

[mrniko]

Unable to reproduce, below is my test code:

public class LazeTest extends BaseCoreFunctionalTestCase {

    @Entity
    public static class A implements Serializable {
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private Long id;

      private String firstName;
      private String lastName;
      private String code;
      private String fatherName;
      @Enumerated
      private PersonelKind kind;
      @ManyToOne(fetch = FetchType.LAZY)
      private B post;

        public Long getId() {
            return id;
        }

        public void setId(Long 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 getCode() {
            return code;
        }

        public void setCode(String code) {
            this.code = code;
        }

        public String getFatherName() {
            return fatherName;
        }

        public void setFatherName(String fatherName) {
            this.fatherName = fatherName;
        }

        public PersonelKind getKind() {
            return kind;
        }

        public void setKind(PersonelKind kind) {
            this.kind = kind;
        }

        public B getPost() {
            return post;
        }

        public void setPost(B post) {
            this.post = post;
        }
    }

    public enum PersonelKind {
        A, B;
    }

    @Entity
    @Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
    public static class B implements Serializable {
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private Long id;

      private String firstName;
      private String lastName;

        public Long getId() {
            return id;
        }

        public void setId(Long 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;
        }
    }

    @Override
    protected Class<?>[] getAnnotatedClasses() {
        return new Class[] { A.class, B.class };
    }

    @Override
    protected void configure(Configuration cfg) {
        super.configure(cfg);
        cfg.setProperty(Environment.DRIVER, org.h2.Driver.class.getName());
        cfg.setProperty(Environment.URL, "jdbc:h2:mem:db1;DB_CLOSE_DELAY=-1;");
        cfg.setProperty(Environment.USER, "sa");
        cfg.setProperty(Environment.PASS, "");
        cfg.setProperty(Environment.CACHE_REGION_PREFIX, "");
        cfg.setProperty(Environment.GENERATE_STATISTICS, "true");

        cfg.setProperty(Environment.SHOW_SQL, "true");
        cfg.setProperty(Environment.USE_SECOND_LEVEL_CACHE, "true");
        cfg.setProperty(Environment.USE_QUERY_CACHE, "true");
        cfg.setProperty(Environment.CACHE_REGION_FACTORY, RedissonRegionFactory.class.getName());
    }
    
    @Before
    public void before() {
        sessionFactory().getCache().evictEntityRegions();
        sessionFactory().getStatistics().clear();
    }

    @Test
    public void test() {
        Session s = openSession();
        s.beginTransaction();

        A a = new A();
        a.setFatherName("nameA");
        B b = new B();
        b.setFirstName("nameB");
        a.setPost(b);
        s.save(b);
        Serializable id = s.save(a);
        s.flush();
        s.getTransaction().commit();

        s = openSession();
        s.beginTransaction();
        A a1 = s.load(A.class, id);
        assertThat(a1.getPost().getFirstName()).isEqualTo("nameB");
        s.getTransaction().commit();
    }
    
}