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I'm using spring 3 with PropertyPlaceholderConfigurator.
My properties code looks like as following:
@Configuration public class MyProps { @Value("${prop1}") public String prop1; ... } If I do not have a prop1 in my .properties file the spring fails to initialize it's context.
The question is how can I define that this property is not mandatory? some annotation, configuration?
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Spring @Configuration annotation is part of the spring core framework. Spring Configuration annotation indicates that the class has @Bean definition methods. So Spring container can process the class and generate Spring Beans to be used in the application.
So in a spring boot application, application. properties file is used to write the application-related property into that file. This file contains the different configuration which is required to run the application in a different environment, and each environment will have a different property defined by it.
Spring @Value annotation is used to assign default values to variables and method arguments. We can read spring environment variables as well as system variables using @Value annotation. Spring @Value annotation also supports SpEL.
You could use a default value:
@Value("${prop1:}") public String prop1; and spring will inject an empty string if the property isn't defined. The syntax is ${property:defaultValue}.
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