Spring Questions and Answers – Transformation and Error handling

This set of Java Spring Multiple Choice Questions & Answers (MCQs) focuses on “Transformation and Error handling”.

1. To send a message into the bus and transform it before working with it further.
a) adding extra headers or augmenting the payload
b) transformer
c) all of the mentioned
d) none of the mentioned
View Answer

2. Spring Integration provides a transformer message endpoint to permit the augmentation of the message headers.
a) True
b) False
View Answer

3.The output is constructed dynamically using MessageBuilder to create a message that has the same payload as the input message as well as copy the existing headers and adds an extra header:

import org.springframework.integration.annotation.Transformer;
import org.springframework.integration.core.Message;
import org.springframework.integration.message.MessageBuilder;
import java.util.Map;
public class InboundJMSMessageToCustomerWithExtraMetadataTransformer {
	@Transformer
	public Message<Customer> transformJMSMapToCustomer(
	Message<Map<String, Object>> inboundSpringIntegrationMessage) {
	Map<String, Object> jmsMessagePayload =
	inboundSpringIntegrationMessage.getPayload();
	Customer customer = new Customer();
	customer.setFirstName((String) jmsMessagePayload.get("firstName"));
	customer.setLastName((String) jmsMessagePayload.get("lastName"));
	customer.setId((Long) jmsMessagePayload.get("id"));
	return MessageBuilder.withPayload(customer)
	.copyHeadersIfAbsent( inboundSpringIntegrationMessage.getHeaders())
	.setHeaderIfAbsent("randomlySelectedForSurvey", Math.random() > .5)
	.build();
	}
}

a) randomlySelected
b) randomlySelectedForSurvey
c) randomly
d) none of the mentioned
View Answer

4. Spring Integration provides the ability to catch exceptions and send them to an error channel of your choosing. By default, it’s a global channel called :-
a) error
b) exceptionChannel
c) exception
d) errorChannel
View Answer

5. The errorChannel doesn’t need to be a service-activator.
a) True
b) False
View Answer

6. All errors thrown from Spring Integration components will be a subclass of:-
a) Messaging
b) MessagingException
c) Exception
d) None of the mentioned
View Answer

7. One way to discriminate by Exception type is to use:-
a) org.springframework.integration.router.ErrorMessageExceptionType
b) org.springframework.integration.router.ErrorMessageException
c) org.springframework.integration.router.ErrorMessageExceptionTypeRouter
d) none of the mentioned
View Answer

8. Sending all the errors to the same channel can eventually lead to a large switch-laden class that’s too complex to maintain.
a) True
b) False
View Answer

9. You can explicitly specify on what channel errors for a given integration should go.
a) True
b) False
View Answer

10. Spring Integration will use that header and forward errors encountered in the processing of this message to that channel.
a) True
b) False
View Answer

import org.apache.log4j.Logger;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.core.Message;
import org.springframework.integration.core.MessageHeaders;
import org.springframework.integration.message.MessageBuilder;
public class ServiceActivatorThatSpecifiesErrorChannel {
private static final Logger logger = Logger.getLogger(
	ServiceActivatorThatSpecifiesErrorChannel.class);
	@ServiceActivator
	public Message<?> startIntegrationFlow(Message<?> firstMessage)
	throws Throwable {
	return MessageBuilder.fromMessage(firstMessage).
	setHeaderIfAbsent( MessageHeaders.ERROR_CHANNEL,
	"errorChannelForMySolution").build();
	}
}

11. All errors that come from the integration in which this component is used will be directed to:-

import org.apache.log4j.Logger;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.core.Message;
import org.springframework.integration.core.MessageHeaders;
import org.springframework.integration.message.MessageBuilder;
public class ServiceActivatorThatSpecifiesErrorChannel {
private static final Logger logger = Logger.getLogger(
	ServiceActivatorThatSpecifiesErrorChannel.class);
	@ServiceActivator
	public Message<?> startIntegrationFlow(Message<?> firstMessage)
	throws Throwable {
	return MessageBuilder.fromMessage(firstMessage).
	setHeaderIfAbsent( MessageHeaders.ERROR_CHANNEL,
	"errorChannelForMySolution").build();
	}
}

a) customErrorChannel
b) customError
c) errorChannel
d) none of the mentioned
View Answer

Sanfoundry Global Education & Learning Series – Java Spring.
To practice all areas of Java Spring, here is complete set of 1000+ Multiple Choice Questions and Answers.