Exception Errors

Question 1

AsyncException

Answer 1

Any problem with an asynchronous operation, such as failing to enqueue an asynchronous call.

Question 2

BigObjectException

Answer 2

Any problem with big object records, such as connection timeouts during attempts to access or insert big object records.

Question 3

CalloutException

Answer 3

Any problem with a Web service operation, such as failing to make a callout to an external system.

Question 4

DmlException

Answer 4

Any problem with a DML statement, such as an insert statement missing a required field on a record.

Question 5

EmailException

Answer 5

Any problem with email, such as failure to deliver. For more information, see Outbound Email.

Question 6

ExternalObjectException

Answer 6

Any problem with external object records, such as connection timeouts during attempts to access the data that’s stored on external systems.

Question 7

IllegalArgumentException

Answer 7

An illegal argument was provided to a method call. For example, a method that requires a non-null argument throws this exception if a null value is passed into the method.

Question 8

InvalidParameterValueException

Answer 8

An invalid parameter was supplied for a method or any problem with a URL used with Visualforce pages. For more information on Visualforce, see the Visualforce Developer’s Guide.

Question 9

LimitException

Answer 9

A governor limit has been exceeded. This exception can’t be caught.

Question 10

JSONException

Answer 10

Any problem with JSON serialization and deserialization operations. For more information, see the methods of System.JSON, System.JSONParser, and System.JSONGenerator.

Question 11

ListException

Answer 11

Any problem with a list, such as attempting to access an index that is out of bounds.

Question 12

MathException

Answer 12

Any problem with a mathematical operation, such as dividing by zero.

Question 13

NoAccessException

Answer 13

Any problem with unauthorized access, such as trying to access an sObject that the current user does not have access to. This exception is used with Visualforce pages. For more information on Visualforce, see the Visualforce Developer’s Guide.

Question 14

NoDataFoundException

Answer 14

Any problem with data that does not exist, such as trying to access an sObject that has been deleted. This exception is used with Visualforce pages. For more information on Visualforce, see the Visualforce Developer’s Guide.

Question 15

NoSuchElementException

Answer 15

This exception is thrown if you try to access items that are outside the bounds of a list. This exception is used by the Iterator next method. For example, if iterator.hasNext() == false and you call iterator.next(), this exception is thrown. This exception is also used by the Apex Flex Queue methods and is thrown if you attempt to access a job at an invalid position in the flex queue.

Question 16

NullPointerException

Answer 16

Any problem with dereferencing null, such as in the following code:

String s;
s.toLowerCase(); // Since s is null, this call causes
// a NullPointerException

Question 17

QueryException

Answer 17

Any problem with SOQL queries, such as assigning a query that returns no records or more than one record to a singleton sObject variable.

Question 18

RequiredFeatureMissing

Answer 18

A Chatter feature is required for code that has been deployed to an organization that does not have Chatter enabled.

Question 19

SearchException

Answer 19

Any problem with SOSL queries executed with SOAP API search() call, for example, when the searchString parameter contains fewer than two characters. For more information, see the SOAP API Developer Guide.

Question 20

SecurityException

Answer 20

Any problem with static methods in the Crypto utility class. For more information, see Crypto Class.

Question 21

SerializationException

Answer 21

Any problem with the serialization of data. This exception is used with Visualforce pages. For more information on Visualforce, see the Visualforce Developer’s Guide.

Question 22

SObjectException

Answer 22

Any problem with sObject records, such as attempting to change a field in an update statement that can only be changed during insert.

Question 23

StringException

Answer 23

Any problem with Strings, such as a String that is exceeding your heap size.

Question 24

TypeException

Answer 24

Any problem with type conversions, such as attempting to convert the String ‘a’ to an Integer using the valueOf method.

Question 25

VisualforceException

Answer 25

Any problem with a Visualforce page. For more information on Visualforce, see the Visualforce Developer’s Guide.

Question 26

XmlException

Answer 26

Any problem with the XmlStream classes, such as failing to read or write XML.

Question 27

Exceptions show errors and other events that disrupt the normal flow of code execution. Which of the following statements are true about Apex Exception Handling?

Choose 3

A. You can have multiple Catch blocks to catch all different kinds of exceptions. If you use a generic exception catcher, it must be the first Catch block.
B. The finally statement is required and gets executed after the catch block executes.
C. The try statement identifies a block of code in which an exception could occur.
D. The try statement identifies a block of code in which an exception could occur.
E. Comparatively, a throw statement allows you to signal that an error has occurred, while try, catch, and finally can be used to pull through from an exception

Answer 27

C. The try statement identifies a block of code in which an exception could occur.

D. The try statement identifies a block of code in which an exception could occur.

E. Comparatively, a throw statement allows you to signal that an error has occurred, while try, catch, and finally can be used to pull through from an exception

Question 28

True or False

A finally block is required in a try, catch, finally statement

Answer 28

False

Question 29

What does a throw statement do?

Answer 29

A throw statement allows you to signal that an error has occurred

Question 30

Try-catch-finally statements are used to…

Answer 30

The try, catch, and finally statements can be used to gracefully recover from a thrown exception

Question 31

what does the ‘try’ in a try-catch-finally statement do?

Answer 31

The try statement identifies a block of code in which an exception can occur.

Question 32

what does the ‘catch’ in a try-catch-finally statement do?

Answer 32

The catch statement identifies a block of code that can handle a particular type of exception.

Question 33

True or False

Each catch statement must have a unique exception type?

Answer 33

True

Question 34

True or False

In try-catch-finally statements, once a particular exception type is caught in one catch block, the remaining catch blocks, if any, aren’t executed.

Answer 34

True

Question 35

what does the ‘catch’ in a try-catch-finally statement do?

Answer 35

The finally statement identifies a block of code that is guaranteed to execute and allows you to clean up your code.

Question 36

True or False

the finally block in a try-catch-finally statement only executes when an exception is thrown.

Answer 36

False

Code in the finally block always executes regardless of whether an exception was thrown or the type of exception that was thrown.