Example JCo code to call SAP function module

//package ws; //Replace with name of your package

import com.sap.mw.jco.*;

public class CallFunction extends Object {

	public static void main(String args[]) {
		CallFunction app = new CallFunction();
	}
	int count;
	JCO.Client mConnection;
	JCO.Repository mRepository;
	String[] SAPInterfaces;
	public CallFunction() {
		try {
			// Logon info
				mConnection = JCO.createClient("500", // SAP client
	 	                                    "username", // userid
		                                     "password", // password
		                                        null, // language
		                               "server name", // application server host name
	                                           "00"); // system number
			mConnection.connect();
			mRepository = new JCO.Repository("ARAsoft", mConnection);
		} catch (Exception ex) {
			ex.printStackTrace();
			System.exit(1);
		}

		JCO.Function function = null;
		JCO.Table codes = null;
		//		codes.firstRow();

		try {
			function = this.createFunction("BAPI_MATERIAL_GETLIST");
			
			if (function == null) {
				System.out.println(
					"BAPI_MATERIAL_GETLIST" + " not found in SAP.");
				System.exit(1);
			}

			codes = function.getTableParameterList().getTable("MATNRSELECTION");

			codes.appendRows(2); // Add two rows to internal table
			codes.setValue("I", "SIGN");
			codes.setValue("EQ", "OPTION");
			codes.setValue("P1001087", "MATNR_LOW");
			codes.setValue("", "MATNR_HIGH");

			codes.nextRow(); // Move onto next row
			codes.setValue("I", "SIGN");
			codes.setValue("EQ", "OPTION");
			codes.setValue("P1001088", "MATNR_LOW");
			codes.setValue("", "MATNR_HIGH");

			mConnection.execute(function);

//			JCO.Table returnTable1 =
//				function.getTableParameterList().getTable("MATERIALSHORTDESCSEL");
//			System.out.println(returnTable1);

//			JCO.Table returnTable2 =
//				function.getTableParameterList().getTable("MATNRLIST");
//			System.out.println(returnTable2);

			// Output result Material list table
			System.out.println(
				function.getTableParameterList().getValue("MATNRLIST"));
			System.out.println(
				function.getTableParameterList().getString("MATNRLIST"));

//			System.out.println(
//				function.getTableParameterList().getValue("MATERIALSHORTDESCSEL"));
//
//			System.out.println(
//				function.getTableParameterList().getString("MATERIALSHORTDESCSEL"));

			// Output Selection table
			System.out.println(
				function.getTableParameterList().getValue("MATNRSELECTION"));
			System.out.println(
				function.getTableParameterList().getString("MATNRSELECTION"));

		} catch (Exception ex) {
			ex.printStackTrace();
			System.exit(1);
		}
	}

	public JCO.Function createFunction(String name) throws Exception {
		try {
			IFunctionTemplate ft =
				mRepository.getFunctionTemplate(name.toUpperCase());
			if (ft == null)
				return null;
			return ft.getFunction();
		} catch (Exception ex) {
			throw new Exception("Problem retrieving JCO.Function object.");
		}
	}
}