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Create own bean [message #1857357]

Wed, 01 February 2023 15:38

Miloslav Frajdl

Messages: 48
Registered: June 2018

Member

Hello.

It is possible create my own bean?
I created interface and class in client part:

@Bean
interface MyInterface {
...
}

class MyClass implements MyInterface {
...
}

And I wanted to use it:

MyInterface cl = BEANS.get(MyInterface.class);
...

But this not works. The app didn't launch but froze on launch. When I removed @Bean, it started.

Am I doing something wrong or does it not work?

Thank you for response.

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Re: Create own bean [message #1857360 is a reply to message #1857357]

Wed, 01 February 2023 16:49

Stephan Merkli

Messages: 40
Registered: April 2012

Member

Hi Miloslav

Yes, you can create own beans that way, your code seems to be okay.

A deadlock could occur when you reference another bean in our MyClass that reference MyClass again. Example:

@Bean
public class A {

  private static final B VALUE = BEANS.get(B.class);
}

@Bean
public class B {

  private static final A VALUE = BEANS.get(A.class);
}

Avoid such code or use LazyValue instead. You might take a thread dump and see what is the blocking operation if there is a different reason for your freeze.

Regards
Stephan

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Re: Create own bean [message #1857382 is a reply to message #1857360]

Thu, 02 February 2023 20:32

Miloslav Frajdl

Messages: 48
Registered: June 2018

Member

Thank you for reponse. It works. The deadlock was caused by this:

class MyClass implements MyInterface {
	private static final String LOGINTYPES = CONFIG.getPropertyValue(LoginTypes.class);
	private static final String ICON_WIDTH = CONFIG.getPropertyValue(LoginIconWidth.class);

...
}

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