Apex Intermediate Progress | ( Lessons)

Lesson: 11 Catching Different Exception Types

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try {
    Account ac = [SELECT Name FROM Account LIMIT 1];
    String Site2 = ac.Site;
} catch(Exception e) {
    System.debug('The following exception has occurred: ' + e.getMessage());    
}

You can have several catch blocks—a catch block for each exception type, and a final catch block that catches the generic Exception type.

try {
    Account m = [SELECT Name FROM Account LIMIT 1];
    String Site2 = m.Site;
} catch(DmlException e) {
    System.debug('DmlException caught: ' + e.getMessage());    
} catch(SObjectException e) {
    System.debug('SObjectException caught: ' + e.getMessage());    
} catch(Exception e) {
    System.debug('Exception caught: ' + e.getMessage());    
}

DEBUG|SObjectException caught: SObject row was retrieved via SOQL without querying the requested field: Account.Site

Remember that only one catch block gets executed and the remaining ones are bypassed.

More Examples:

Causes a NullPointerException

try {
    String s;
    Boolean b = s.contains('abc');
} catch(DmlException e) {
    System.debug('DmlException caught: ' + e.getMessage());    
} catch(SObjectException e) {
    System.debug('SObjectException caught: ' + e.getMessage());    
} catch(Exception e) {
    System.debug('Exception caught: ' + e.getMessage());    
}

DEBUG|Exception caught: Attempt to de-reference a null object

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Apex Intermediate

A. Apex DML Operations (8 lessons)

B. Apex Classes (17 lessons)

C. Apex Triggers (9 lessons)

D. Apex Exceptions (11 lessons)

E. Asynchronous Apex (6 lessons)

F. SOSL (10 lessons)

G. Testing Apex (9 lessons)

H. Apex Fast Recap (142 lessons)

I. Build Apex Coding Skills (64 lessons)

J. Miscellaneous (17 lessons)

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Lesson: 11 Catching Different Exception Types

Notes

Apex Intermediate