[Solved] Consider this bean definition:@Bean @ConditionalOnProperty(name = "app.... }If the property app.mode is not set in application.properties, what happens? | Spring Boot

Spring Boot - Advanced Patterns

Consider this bean definition:

@Bean
@ConditionalOnProperty(name = "app.mode", havingValue = "prod", matchIfMissing = false)
public DataSource prodDataSource() { return new DataSource(); }

If the property app.mode is not set in application.properties, what happens?

AThe bean <code>prodDataSource</code> is created

BThe bean is created with default values

CThe bean <code>prodDataSource</code> is NOT created

DAn error occurs due to missing property

Step-by-Step Solution

Solution:

Step 1: Understand matchIfMissing behavior
matchIfMissing = false means the bean is created only if the property exists and matches the value.
Step 2: Analyze property absence
Since app.mode is not set, the condition fails and the bean is not created.
Final Answer:
The bean prodDataSource is NOT created -> Option C
Quick Check:
matchIfMissing=false prevents bean creation if property missing [OK]

Quick Trick: matchIfMissing=false skips bean if property missing [OK]

Common Mistakes:

Assuming bean creates by default if property missing
Confusing matchIfMissing default value
Expecting error on missing property

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More Spring Boot Quizzes

Consider this bean definition:

Step 1: Understand matchIfMissing behavior

Step 2: Analyze property absence

Final Answer:

Quick Check:

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