Recently I needed to call a stored procedure which had Oracle’s XMLType as IN and OUT parameters.

The first thing to do is add xdb.jar and xmlparserv2.jar file to your application lib. These contain the required class files for Oracle XML API. the jars can be found under your installation of oracle client lib folders. Also don’t forget to add oracle jdbc driver files – ojdbc6 or ojdbc14.

The code I setup was this –

[sourcecode language=”java”]
XMLType reqInXml;
XMLType reqOutXML;
String atpInStr = "";
OpResponse output = null;

try {
reqInStr = jaxbMarshalRequestToString(input);
System.out.println("Input : " + reqInStr);
} catch (JAXBException ex) {
logger.log(Level.SEVERE, null, ex);
} catch (IOException ex) {
logger.log(Level.SEVERE, null, ex);
}

//input.getHeader().setNotes("THIS VALUE RETURNED BY FACADE : " + XXDS);
try {
Connection con = XXDS.getConnection();
//The IN parameter for stored proc is Oracle XDB XMLType
reqInXml = XMLType.createXML(con, reqInStr);
OracleCallableStatement stmt = (OracleCallableStatement) con.prepareCall("call DEMO_PROC.ProcessXMLRequest(?, ?, ?, ?)");
stmt.setObject(1, reqInXml);

//set out parameters
stmt.registerOutParameter (2, OracleTypes.OPAQUE,"SYS.XMLTYPE");
stmt.registerOutParameter(3, Types.INTEGER);
stmt.registerOutParameter(4, Types.VARCHAR);

stmt.executeQuery();
int resultCode = stmt.getInt(3);
String resultMsg = stmt.getString(4);
System.out.println("result code : " + resultCode);
System.out.println("result msg : " + resultMsg);
if (resultCode == 101 || resultCode == 100){
reqOutXML = XMLType.createXML(stmt.getOPAQUE(2));
System.out.println("Output from ERP :" + reqOutXML.getStringVal());
output = jaxbUnmarshalFromString(reqOutXML.getStringVal());
}
}
….
[/sourcecode]

This gave me “java.lang.ClassCastException: com.sun.gjc.spi.jdbc40.ConnectionHolder40 cannot
be cast to oracle.jdbc.OracleConnection” Exception. The connection was being returned from GlassFish JDBC ConnectionPool and was instance of OracleConnectionPooldataSource.
The FIX proved tricky, but in the end it was simple –
Do this –

[sourcecode language=”java”]
OracleConnection oraCon = con.unwrap(OracleConnection.class);
//The IN parameter for stored proc is Oracle XDB XMLType
atpInXml = XMLType.createXML(oraCon, atpInStr);
[/sourcecode]

Pass the cast instance of OracleConnection to the XMLType API.