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 Post subject: File size is twice the real size at insert request in a blob
PostPosted: Thu Jan 07, 2016 9:18 am 
Newbie

Joined: Thu Jan 07, 2016 8:56 am
Posts: 1
We user MySQL + Hibernate 4.3.8 + JPA (+ Spring) for our project.

We have created an entity which is mapped to a table with a blob column, declared as a JPA @Lob.
MySQL
Code:
max_allowed_packet
parameter is set to 16Mb.

When trying to insert a file of 10Mb (serialized size = 13Mb) in this table, we have the following error :
Code:
Caused by: org.hibernate.exception.GenericJDBCException: could not execute statement
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
...

Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (
26667037 > 16777216). You can change this value on the server by setting the max_allowed_packet' variable.
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3540)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2417)


It seems that Hibernate generates a request with an object that has twice the size of the original object.

The only solution we have found is to set MySQL
Code:
max_allowed_packet
to 32Mb but it's an ugly one.

Does anyone have encountered the same problem ?


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