C3P0, rawConnectionOperation() & java.lang.IllegalArgumentException - sql

Question

I am attempting to use a non-standard method, getServerJobIdentifier(), that is part of the IBM Java Tool Box (jt400.jar) and class com.ibm.as400.access.AS400JDBCConnection with C3P0 & rawConnectionOperation(). I am getting "java.lang.IllegalArgumentException: object is not an instance of declaring class". I have tried numerous options but have not stumbled upon the correct parameters to pass. I am using C3P0 0.9.5.4. Code snippet follows:
// The method I want to call.
// getServerJobIdentifier, public abstract java.lang.String com.ibm.as400.access.AS400JDBCConnection.getServerJobIdentifier()
String driverClassName = "com.ibm.as400.access.AS400JDBCDriver";
String m_DatabaseConnectionString = "jdbc:db2:*local;naming=sql;extended metadata=true";
Connection m_dbConnection;
ComboPooledDataSource m_cpds;
m_cpds = new ComboPooledDataSource();
try {
m_cpds.setDriverClass(driverClassName); //loads the jdbc driver
}
catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
m_cpds.setJdbcUrl(m_DatabaseConnectionString);
m_dbConnection = m_cpds.getConnection();
String qualifiedName = "";
C3P0ProxyConnection castCon = (C3P0ProxyConnection)m_dbConnection;
Method m = AS400JDBCConnection.class.getDeclaredMethod("getServerJobIdentifier");
// This does return what I want. getServerJobIdentified() has no parameters.
System.out.println("method=" + m.toString());
Object[] args = new Object[] {};
System.out.println("calling rawConnectionOperation");
qualifiedName = (String) castCon.rawConnectionOperation(m, C3P0ProxyConnection.RAW_CONNECTION, args);
// never gets here
System.out.println("qualifiedName=" + qualifiedName);
I know I'm that close or I think I am. Thanks!
import java.util.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import com.mchange.v2.c3p0.*;
import com.ibm.as400.access.AS400;
import com.ibm.as400.access.AS400JDBCConnection;
import com.ibm.as400.access.AS400SecurityException;
import com.ibm.db2.jdbc.app.DB2Connection;
// javac -cp :./c3p0-0.9.5.4.jar:./mchange-commons-java-0.2.15.jar:./jt400.jar C3P0Main.java
// /QIBM/ProdData/OS400/jt400/lib/jt400Native.jar
// java -cp :./c3p0-0.9.5.4.jar:./mchange-commons-java-0.2.15.jar:./jt400.jar C3P0Main
// or
// java -cp :./c3p0-0.9.5.4.jar:./mchange-commons-java-0.2.15.jar:/QIBM/ProdData/OS400/jt400/lib/jt400Native.jar C3P0Main
// c3p0.acquireRetryAttempts=0
// c3p0.acquireRetryDelay=5000
// c3p0.breakAfterAcquireFailure=false
// c3p0.maxConnectionAge=10800
// c3p0.maxIdleTime=3600
// c3p0.maxIdleTimeExcessConnections=600
// c3p0.automaticTestTable=c3p0test
// c3p0.idleConnectionTestPeriod=600
// c3p0.testConnectionOnCheckout=true
// java -cp :./c3p0-0.9.5.4.jar:./mchange-commons-java-0.2.15.jar:./jt400.jar -Dc3p0.acquireRetryAttempts=0 -Dc3p0.acquireRetryDelay=5000 -Dc3p0.breakAfterAcquireFailure=false -Dc3p0.maxConnectionAge=10800 -Dc3p0.maxIdleTime=3600 -Dc3p0.maxIdleTimeExcessConnections=600 -Dc3p0.automaticTestTable=c3p0test -Dc3p0.idleConnectionTestPeriod=600 -Dc3p0.testConnectionOnCheckout=true C3P0Main
public class C3P0Main {
private Connection m_dbConnection;
private ComboPooledDataSource m_cpds;
private String driverClassName = "com.ibm.as400.access.AS400JDBCDriver";
//private String m_DatabaseConnectionString = "jdbc:as400:BNADEV;naming=sql;extended metadata=true;user=beak;password=roatan12";
private String m_DatabaseConnectionString = "jdbc:as400:BNADEV;naming=sql;extended metadata=true";
private String m_databaseServerJobID;
public C3P0Main() throws SQLException
{
m_cpds = new ComboPooledDataSource();
try {
m_cpds.setDriverClass(driverClassName); //loads the jdbc driver
}
catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
m_cpds.setJdbcUrl(m_DatabaseConnectionString);
}
public void run(String[] args) throws Exception
{
m_dbConnection = m_cpds.getConnection();
System.out.println("m_dbConnection=" + m_dbConnection.toString());
String qualifiedName = "";
try {
// To use it, first cast the returned Connection to a C3P0ProxyConnection.
// Then call the method rawConnectionOperation, supplying the java.lang.reflect.Method object
// for the non-standard method you wish to call as an argument. The Method you supply will
// be invoked on the target you provide on the second argument (null for static methods),
// and using the arguments you supply in the third argument to that function. For the target,
// and for any of the method arguments, you can supply the special token
// C3P0ProxyConnection.RAW_CONNECTION, which will be replaced with the
// underlying vendor-specific Connection object before the Method is invoked.
//
// C3P0ProxyConnection castCon = (C3P0ProxyConnection) c3p0DataSource.getConnection();
// Method m = CLOB.class.getMethod("createTemporary", new Class[]{Connection.class, boolean.class, int.class});
// Object[] args = new Object[] {C3P0ProxyConnection.RAW_CONNECTION, Boolean.valueOf( true ), new Integer( 10 )};
// CLOB oracleCLOB = (CLOB) castCon.rawConnectionOperation(m, null, args);
// getServerJobIdentifier, public abstract java.lang.String com.ibm.as400.access.AS400JDBCConnection.getServerJobIdentifier()
System.out.println("Is a wrapper for DB2Connection=" + m_dbConnection.isWrapperFor(com.ibm.db2.jdbc.app.DB2Connection.class));
System.out.println("Is a wrapper for AS400JDBCConnection=" + m_dbConnection.isWrapperFor(AS400JDBCConnection.class));
C3P0ProxyConnection castCon = (C3P0ProxyConnection)m_dbConnection;
System.out.println("C3P0ProxyConnection.RAW_CONNECTION=" + C3P0ProxyConnection.RAW_CONNECTION.getClass().getName());
Method method = AS400JDBCConnection.class.getMethod("getServerJobIdentifier");
System.out.println("method=" + method.toString());
Object[] method_args = new Object[] {};
System.out.println("calling rawConnectionOperation");
try {
qualifiedName = (String) castCon.rawConnectionOperation(method, m_dbConnection, method_args);
System.out.println("qualifiedName=" + qualifiedName);
}
catch (IllegalArgumentException | SQLException | InvocationTargetException | IllegalAccessException e) {
System.out.println(e);
System.out.println("oh well #1.");
}
try {
Object[] method_args = new Object[] {};
qualifiedName = (String) castCon.rawConnectionOperation(method, m_dbConnection, method_args);
System.out.println("qualifiedName=" + qualifiedName);
}
catch (IllegalArgumentException | SQLException | InvocationTargetException | IllegalAccessException e) {
System.out.println(e);
System.out.println("oh well #2.");
}
if (castCon instanceof AS400JDBCConnection) {
System.out.println("YES");
qualifiedName = ((AS400JDBCConnection)C3P0ProxyConnection.RAW_CONNECTION).getServerJobIdentifier();
String jobName = qualifiedName.substring(0, 10).trim();
String jobUser = qualifiedName.substring(10, 20).trim();
String jobNumber = qualifiedName.substring(20).trim();
m_databaseServerJobID = jobNumber + '/' + jobUser + '/' + jobName;
System.out.println("SQL Server Job ID: " + m_databaseServerJobID);
}
else {
System.out.println("m_dbConnection is not an instance of DB2Connection.");
}
}
catch (IllegalArgumentException | SQLException | NoSuchMethodException e) {
System.out.println(e);
System.out.println("oh well.");
}
}
public static void main(java.lang.String args[])
{
try {
C3P0Main app = new C3P0Main();
app.run(args);
}
catch (Exception e) {
e.printStackTrace();
}
}
}