Conditional Beans

Quartz supports fine-grained bean activation control through several conditional annotations:

@Environment

Defines in which environments the bean should be active. Accepts single or multiple names, and negation with !:

@Environment("dev")
public class DevOnlyFeature { }

@Environment("!prod")
public class NotInProduction { }

@Environment({"prod", "!mysql", "psql"})
public class ComplexRuleBean { }

@ActivateWhen

Activates the bean only if a custom condition passes. The condition must implement GenericCondition:

@Injectable
public class SaturnAlignedWithJupiter implements GenericCondition {

    public boolean test() { 
        return true; 
    }
}

@ActivateWhen(SaturnAlignedWithJupiter.class)
public class CosmicBean { }

@ActivateWhenAnnotationPresent

Activates the bean if another bean with a specific annotation exists in the container:

@ActivateWhenAnnotationPresent(SpecialFeature.class)
public class DependsOnSpecialFeature { }

@ActivateWhenBeanPresent / @ActivateWhenBeanMissing

Activates the bean only if a specific bean is present or not:

@ActivateWhenBeanMissing(MyFallback.class)
public class UseFallbackIfMissing { }

@ActivateWhenBeanPresent(MyService.class)
public class DependentBean { }

@ActivateWhenClassPresent / @ActivateWhenClassMissing

Checks if a class exists or not on the classpath:

@ActivateWhenClassPresent(classNames = {"com.example.SomeClass"})
public class OptionalIntegration { }

@ActivateWhenClassMissing(classNames = {"com.example.SomeClass"})
public class OptionalIntegration { }

@ActivateWhenPropertyEquals

Activates if a configuration property has a specific value:

@ActivateWhenPropertyEquals(
value = @Property("${feature.enabled:true}"),
expected = "true"
)
public class FeatureFlaggedBean { }

These conditions allow you to dynamically register or ignore beans depending on environment, presence of other beans, classpath inspection, or configuration properties.