How to run custom code before database connection establish in spring boot?

Question

in my source code I need to set some properties, Database connection certifications on code level before the database connection establishes.

        System.setProperty("javax.net.ssl.trustStorePassword", keystorePassword);

edit - I tried it using java -Djavax.net.ssl.trustStorePassword=yourPassword on runtime, but I want to do it in code level.

thopaw · Accepted Answer · 2019-10-14 07:26:47Z

2

I would suggest that you set this with a -D parameter when starting the JVM like in

java -Djavax.net.ssl.trustStorePassword=yourPassword ...

This goes along with the 12-factor-apps and makes your app easier to maintain

answered Oct 14, 2019 at 7:26

thopaw

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8 Comments

Akalanka Hewawasam Over a year ago

That works, but my requirement is to do that in code level.

thopaw Over a year ago

You could perhaps use @PostContruct within your @Config class like described here. But then you should not create a connection before the initialization is finished. Or when using spring boot you can do this in the main method of your app before starting Spring Boot. My advise would be to refactor the app so that it can work with System Properties from the environment

Akalanka Hewawasam Over a year ago

Really appreciate your help. In my project I do not use any configuration class for connecting to the db. I used persistent entity and spring repositories. I wrote and @postconstruct method in my persistent entity. but it did not work.

thopaw Over a year ago

How do you start your application? You should be able to do something before you init the spring context.

Akalanka Hewawasam Over a year ago

currently I set them in main method before SpringApplication.run(SomeApplication.class, args); and It works perfectly. Im looking for a better way. and setting them through application properties.

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