Software environment：
oracle 9i
hibernate 3.0.5

hibernate.cfg.xml

<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.connection.datasource">jdbc/pool/lbs</property>
<property name="hibernate.jdbc.batch_size">0</property>
<property name="hibernate.connection.provider_class">org.hibernate.connection.DatasourceConnectionProvider</property>
<property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>

java file
import java.sql.Blob;
public void setHEADPICIMAGE(Blob HEADPICIMAGE) {
this.HEADPICIMAGE = HEADPICIMAGE;
}
public Blob getHEADPICIMAGE() {
return HEADPICIMAGE;
}
Map file：
<property
name="HEADPICIMAGE"
type="java.sql.Blob"
column="HEADPICIMAGE"
/>

The mistake hint：
java.lang.NullPointerException
at oracle.sql.LobPlsqlUtil.plsql_getChunkSize(LobPlsqlUtil.java:1215)
at oracle.sql.LobPlsqlUtil.plsql_getChunkSize(LobPlsqlUtil.java:121)
at oracle.jdbc.dbaccess.DBAccess.getLobChunkSize(DBAccess.java:955)
at oracle.sql.LobDBAccessImpl.getChunkSize(LobDBAccessImpl.java:111)
at oracle.sql.BLOB.getChunkSize(BLOB.java:228)
at oracle.sql.BLOB.getBufferSize(BLOB.java:242)
at oracle.sql.BLOB.getBinaryStream(BLOB.java:124)

Analyze：
Blob blob = ih.getHEADPICIMAGE() ;
Time blob adjusted to try of object is not for empty.But adjust to use
InputStream in = blob.getBinaryStream();
ot time throw a NullPointerException