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Asked: 2026-05-26T20:18:56+00:00

I have a byte[] that I am persisting to a Lob as follows: @Basic(fetch

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I have a byte[] that I am persisting to a Lob as follows:

@Basic(fetch = FetchType.LAZY)
@Column(name = "ABF", length = Integer.MAX_VALUE)
@Lob
private byte[] abf;

Seems simple enough, but when I attempt to store anything sizable in it (more than 4000 characters) I get the following exception when I try to commit:

java.sql.SQLException: ORA-01460: unimplemented or unreasonable conversion requested

None of the files I am attempting to store are anywhere near 32,000 characters. Is there some other gotcha here?

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1 Answer

  1. Editorial Team

    See this post.

    Nutshell: 

    <property name="hibernate.connection.SetBigStringTryClob">true</property>
<property name="hibernate.jdbc.batch_size">0</property>

    It can also be:

    • Old Oracle JDBC driver (although I think then the limit was 2k)
    • Driver/DB version mismatch
    • Wrong Oracle dialect specified in Hibernate config

    For DB stuff it’s always helpful to supply driver and DB version info 🙂

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