Most wrongly answered Question Spring boot | Spring boot profiles Interview Questions | Code Decode

Spring boot profile management for different environment is a very important spring boot interview question.
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How do you segregate your environment specific properties in Spring Boot?
Spring Profiles provide a way to segregate parts of your application configuration and make it only available in certain environments.
Example : how to configure different databases at runtime based on the specific environment by their respective profiles. As the DB connection is better to be kept in a property file, it remains external to an application and can be changed.
How To create profiles in Spring boot?
Spring Boot - by default - provides just one property file ( application.properties).
So, how will we segregate the properties based on the environment?
The solution would be to create more property files and add the "profile" name as the suffix and configure Spring Boot to pick the appropriate properties based on the profile. For example :
The application.properties will remain as a master properties file, but if we override any key in the profile-specific file, the latter will gain precedence.
How To Pick specific profile like Dev in Spring boot?
Spring only acts on a profile if it’s activated. Let’s look at the different ways to activate a profile.
The default profile is always active. Spring Boot loads all properties in application.properties into the default profile. We could rename the configuration file to application-default.properties and it would work the same.
This profile is a fallback property file. This means that if a property is defined in the default profile, but not in the foo profile, the property value will be populated from the default profile. This is very handy for defining default values that are valid across all profiles.
To activate other profiles than the default profile, we have to let Spring know which profiles we want to activate.
spring.profiles.active=dev
-Dspring.profiles.active=dev
SpringApplication application = new SpringApplication(.class)
SpringApplication.setAdditionalProfiles("dev");
application.run(args);
Multiple sources too can be active using -
spring.profiles.active=prod, dev
-Dspring.profiles.active=prod,dev
If common properties are there in both then last one will override - here Dev will override
How Can we configure A bean to be created only in a certain Profile?
With profiles, we can also control which beans are loaded into Spring’s application context.
@Component
@Profile("Test")
class TestBean {
This bean will automatically be picked up by Spring Boot’s classpath scan because we used the @Component annotation.
The bean will not be instantiated and not be added to the application context if profile is not Test.
Use Profile-Specific Beans Responsibly!
Adding certain beans to the application context for one profile, but not for another, can quickly add complexity in application! We always have to pause and think if a bean is available in a particular profile or not, otherwise, this may cause NoSuchBeanDefinitionExceptions when other beans depend on it!
What is @Profile Annotation used for?
@Profile annotation associates a bean to a particular profile
The @Profile annotation simply takes the names of one or multiple profiles.
Ex: We need a bean that should only be active during development, but not production
@Profile("!dev")
@Component
What is @PropertySource Annotation used for?

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[@balakrishnasoftware2666]

Can you please make video for connecting with multiple database in spring boot

[@CodeDecode]

Sure 👍

[@kids-plays]

Don't add ads in between

[@sheikh_mohd_Uzair]

Create video on unit testing for service layer and controller using TDD(test driven development).

[@CodeDecode]

Sure we will create it soon

[@gayatrideshpande5456]

Plz create it

[@sundaraV-k8l]

Hi, I have created the same demo, but message is not printing, just showing as started SpringBootApplicaiton, no error. how to debug?

[@gattemvenkatvijay]

Q: How will find a particular controller in a spring boot application.. if I have some 1000s of controller classes.. how to debug?find a easiest solution

[@PJ-oz2pg]

Thanks for sharing the knowledge. Its very helpful.

[@CodeDecode]

Thanks 😊👍

[@NMK255]

Very crisp and clear. Thank you so much ❤ keep rocking🎉

[@CodeDecode]

Thanks 😊

[@techieadi4377]

bravo , they have ask me the same question if QA has two data base property how you can define

[@anilsingh-gt7yd]

Hi.. are there any paid batches also going on?

[@CodeDecode]

Not yet Anil. Will let you know if there is any🙂

[@devmantras5587]

Wow, all thing at one place. Thanks a lot.

[@CodeDecode]

😊👍

[@varunb2453]

Hi, Can you please create videos on spring could config and shows us with different environments with it.. thank you

[@amitnilajkar6272]

make a nice video on dynamic forms where u connect from nosql. just basic is enough

[@CodeDecode]

Ui + backend?

[@amitnilajkar6272]

@@CodeDecode dynamic forms ( standalone components), nodejs , loading controls from mongodb (like metadata form structure ). something like that. great videos you have done very clear logical flow explanation.

[@amitnilajkar6272]

@@CodeDecode u can check this video where he is loading from json files as http cors... i think mongodb nobody has done much n it will be unique. check this link
ruclips.net/video/25IPuO_8hxg/видео.html

[@ruchajoshi1517]

Good explanation

[@CodeDecode]

Thanks

[@arpitsik4649]

💯❤️

[@CodeDecode]

🙂🙂

[@lunatichigh2896]

Thank you

[@CodeDecode]

You're welcome

[@LuminalLife2808]

awesome, cleared lot of concepts

[@CodeDecode]

thanks

[@Ashibha]

Please make series on gemfire implementation

[@zabhashdamha]

Superb. Simple and crisp 👍

[@CodeDecode]

Thanks 🙂🙂

[@NikhilR07]

Nice video ☺️

[@CodeDecode]

Thanks nikhil

[@padmapriya6880]

Hi, please do file handling concept for interview preparation

[@praveenn7001]

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[@praveenn7001]

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[@praveenn7001]

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[@hamednikbakht9708]

hi please add subtitle

[@akashyadav-fp7re]

try to watch video in laptop you can find transcript in 3 dotted icon. where you can easily get subtitles.

[@CodeDecode]

Thanks Akash👍🙂

[@hamednikbakht9708]

@@akashyadav-fp7re Thankful

[@santosh0513]

Teaching skill is simple and super, thank you 😊

[@CodeDecode]

Thanks Santosh 🙂🙂