Spring JDBC lob insertion fails: Invalid column type - oracle

Question

The code:
jdbcTemplate.update("MERGE INTO app_role_data x USING (select ? name, ? xml FROM dual) d ON (x.app_name = d.name) WHEN MATCHED THEN UPDATE SET x.xml_blob = d.xml WHEN NOT MATCHED THEN INSERT(app_name, xml_blob) VALUES(d.name, d.xml)",
new AbstractLobCreatingPreparedStatementCallback(lobHandler) {
protected void setValues(PreparedStatement ps, LobCreator lobCreator) throws SQLException {
ps.setString(1, appName);
lobCreator.setClobAsString(ps, 2, xmlBlob);
}
});
lobHandler is an instance of OracleLobHandler that's injected in the context.
The exception:
Caused by: java.sql.SQLException: Invalid column type
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)
at oracle.jdbc.driver.OraclePreparedStatement.setObjectCritical(OraclePreparedStatement.java:9231)
at oracle.jdbc.driver.OraclePreparedStatement.setObjectInternal(OraclePreparedStatement.java:8812)
at oracle.jdbc.driver.OraclePreparedStatement.setObjectInternal(OraclePreparedStatement.java:9534)
at oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java:9517)
at org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:351)
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:216)
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:144)
at org.springframework.jdbc.core.ArgPreparedStatementSetter.doSetValue(ArgPreparedStatementSetter.java:65)
at org.springframework.jdbc.core.ArgPreparedStatementSetter.setValues(ArgPreparedStatementSetter.java:46)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:815)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:1)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:586)
This is Spring framework 3.0.5.RELEASE.
Our oracle driver dependency is
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.3.0</version>
</dependency>
The table:
SQL> desc app_role_data
Name Null? Type
----------------------------------------- -------- ----------------------------
APP_NAME VARCHAR2(64)
XML_BLOB CLOB
I'm not even sure what other information I can add, but I'll be happy to do so if I've left something out.

Answer 1

Turns out, execute() takes a PreparedStatementCallback, while update() takes a PreparedStatementSetter. But both have overloads that take Object, so the compiler doesn't complain.
Grumble. That's a day of my life I'll never get back.

Answer 2

I am being a little skeptical about the column names here
Can you try something like below in your MERGE
select ? as name, ? as xml FROM dual
But I am skeptical of that too since the way you can have dynamic column names is by creating a dynamic sql and executing it with EXECUTE IMMEDIATE.
Or may be something like this (not best in terms of Oracle)-
jdbcTemplate.update("MERGE INTO app_role_data x USING dual d ON (x.app_name = ?) WHEN MATCHED THEN UPDATE SET x.xml_blob = ? WHEN NOT MATCHED THEN INSERT(app_name, xml_blob) VALUES(?, ?)",......