GetInputPera return null when declare outside ExecuteBusinessLogic : How to Solve It

Q&A
1

i m creating one custom connector .
in this connector i want to use method calling structure.
but when i declare variables with get parameter it always return null.
i have to declare parameter into
ExecutebusinessLogic()
but that can’t be reference outside that method .
so i want to publicly define variable
i tried different , but still same : null return .
pl do something

code :

package org.mycompany.connector;

import java.util.logging.Logger;

import org.bonitasoft.engine.connector.AbstractConnector;
import org.bonitasoft.engine.connector.ConnectorException;
import org.bonitasoft.engine.connector.ConnectorValidationException;

public class Log_TestImpl extends AbstractConnector {

Logger logger = Logger.getLogger("org.bonitasoft");
private Logger LOGGER = Logger.getLogger(this.getClass().getName());
protected final static String IP1_INPUT_PARAMETER = "ip1";
protected final static String IP2_INPUT_PARAMETER = "ip2";
protected final static String IP3_INPUT_PARAMETER = "ip3";
String s1 = (String) getInputParameter(IP1_INPUT_PARAMETER);
String s2 = (String) getInputParameter(IP2_INPUT_PARAMETER);
String s3 = (String) getInputParameter(IP3_INPUT_PARAMETER);

@Override
public void validateInputParameters() throws ConnectorValidationException {
	try {
		getInputParameter(IP1_INPUT_PARAMETER);
	} catch (ClassCastException cce) {
		throw new ConnectorValidationException("ip1 type is invalid");
	}
	try {
		getInputParameter(IP2_INPUT_PARAMETER);

	} catch (ClassCastException cce) {
		throw new ConnectorValidationException("ip2 type is invalid");
	}
	try {
		getInputParameter(IP3_INPUT_PARAMETER);
	} catch (ClassCastException cce) {
		throw new ConnectorValidationException("ip3 type is invalid");
	}

}

@Override
protected void executeBusinessLogic() throws ConnectorException {
	// Get access to the connector input parameters
	// getIp1();
	// getIp2();
	// getIp3();

	logger.severe("THIS IS FROM WITH OUT ABSTRACT ");
	logger.severe(s1);
	logger.severe(s2);
	logger.severe(s3);

	// TODO execute your business logic here

	// WARNING : Set the output of the connector execution. If outputs are
	// not set, connector fails
	try {
		validateInputParameters();
	} catch (ConnectorValidationException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	logger.severe("CALLING LOG PERA");
	logInputParameters();
	logger.severe("BACK TO ORGINAL CLASS IT DONE ");
}

private void logInputParameters() {
	logInputParameter(IP1_INPUT_PARAMETER);
	logInputParameter(IP2_INPUT_PARAMETER);
	logInputParameter(IP3_INPUT_PARAMETER);

}

private void logInputParameter(String parameterName) {
	LOGGER.severe(parameterName + " "
			+ String.valueOf(getInputParameter(parameterName)));
}

@Override
public void connect() throws ConnectorException {
	// [Optional] Open a connection to remote server

}

@Override
public void disconnect() throws ConnectorException {
	// [Optional] Close connection to remote server

}

}