org.hibernate.HibernateException：无法访问 lob stream Postgresql 9.6

Question

Please, help me with this strange thing.

Yesterday without having any changes in code and DB I got an error when I'd tried to call endpoint: org.hibernate.HibernateException: Unable to access lob stream.

In the project:

• Hibernate v. 5.3.10.Final
• Spring-jdbc v. 5.1.8.RELEASE
• PostgreSQL JDBC Driver - JDBC 4.2
  42.2.5
• Postgers DB - 9.6

Entity like this:

@Lob
@Column(nullable = true)
@Basic(fetch = FetchType.EAGER)
private String payload;

I found in hibernate logs that possible problem may be in ohtdescriptor.sql.BasicExtractor in extracting CLOB. The strangest thing that on dev-stage all works correct, but on dev stage we have postgres 10.1.

I've tried:

1. Added @Type(type="text") - main problem was solved, but I got CLOB id instead of real info in CLOB;
2. Added to @Column() columnDefinition = TEXT/CLOB - doesn't work;

3. Added @Type(type="materialized_clob") or @Type(type="clob") - doesn't work;

4. Removed @Transactional from method that uses this entity - doesn't work;

On dev stage I see in logs:

TRACE o.h.t.descriptor.sql.BasicExtractor - extracted value ([payload4_0_1_] : [CLOB]) - [{"adId":2,"syncStatus":2,"syncErrorCode":0,"syncErrorText":"","crdate":"Sep 25, 2017, 7:16:25 PM","upddate":"Aug 28, 2019, 2:19:00 PM"}]

On another stage I see that if CLOB is null - it works, if not null - I get an error.

I hope somebody can help me, if info isn't enough I am ready to give additional info.

Thanks in advance!

Answer 1

I found possible root cause: Something was happened in DB and CLOBs were deleted and only relation ids stayed in DB. For previous rows I get in the CLOB field something like 2341535, for current - real json-object.