A developer sets spring.datasource.url=jdbc:mysql://localhost:3306/db in application.properties but the app fails to connect. What could be a configuration mistake?

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Spring Boot - Application Configuration

A developer sets spring.datasource.url=jdbc:mysql://localhost:3306/db in application.properties but the app fails to connect. What could be a configuration mistake?

AUsing wrong port number 3306

BMissing username and password properties

CDatabase URL must be in uppercase

DDatasource URL should be in YAML format

Step-by-Step Solution

Solution:

Step 1: Check required datasource properties
Besides URL, username and password are needed to connect to DB.
Step 2: Evaluate other options
Port 3306 is default for MySQL, URL case does not matter, and properties file format is correct.
Final Answer:
Missing username and password properties -> Option B
Quick Check:
DB connection needs URL, username, and password [OK]

Quick Trick: DB connection needs URL plus username and password [OK]

Common Mistakes:

Forgetting username/password
Changing default port unnecessarily
Confusing file formats

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A developer sets spring.datasource.url=jdbc:mysql://localhost:3306/db in application.properties but the app fails to connect. What could be a configuration mistake?

Step 1: Check required datasource properties

Step 2: Evaluate other options

Final Answer:

Quick Check:

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