SQL> desc blob_test; 
Name           Type 
--------------------
ID            NUMBER(3) 
NAME          VARCHAR2(10) 
JAVAOBJ       BLOB 

public class OracleBlob 
{ 
public static void main(String[] args) 
{ 
try 
{ 
OracleOCIConnectionPool pool = new OracleOCIConnectionPool(); 
pool.setUser("tbx"); 
pool.setPassword("tbx"); 
pool.setURL("jdbc:oracle:oci:@test26"); 

Properties p = new Properties(); 

p.put(OracleOCIConnectionPool.CONNPOOL_MAX_LIMIT,"1"); 
p.put(OracleOCIConnectionPool.CONNPOOL_MIN_LIMIT,"0"); 
p.put(OracleOCIConnectionPool.CONNPOOL_INCREMENT,"0"); 

pool.setPoolConfig(p); 

Connection con = pool.getConnection(); 

Obj obj = new Obj(); 
obj.setVal(141.344); 

PreparedStatement prms = con.prepareStatement("insert into blob_test values (?,?,?)"); 

prms.setString(1,"00"); 
prms.setObject(2,"name"); 
prms.setObject(3,(Object)obj,Types.JAVA_OBJECT); 

prms.executeUpdate(); 
prms.close(); 
con.close(); 
pool.close(); 

} 
catch (Exception e) 
{ 
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. 
} 

} 

}

public class Obj implements java.io.Serializable 
{ 

private double amount; 

public void setVal(double amount){ 

this.amount = amount; 
} 

public double getVal(){ 
return this.amount; 
} 
}