how can I reload/refresh properties in spring at runtime without jvm restart?

Question

how can I reload/refresh properties in spring at runtime without jvm restart?

I am looking for something elegant and it should be applicable in Prod. Therefore, JRebel is off the table I guess.

Currently, I have my properties in MYProject.properties

oms.url=abbc.com
checkin.enabled=true

and my java file is autowired to search and use these properties from applicationContext provided different property files:

<bean id="applicationProperties" class="myproject.config.CustomPropertyPlaceHolder">
        <property name="ignoreResourceNotFound" value="true" />
        <property name="locations">
            <list>
                <value>classpath:MyProject.properties</value>
                <value>file:${CATALINA_BASE}/lib/MyProject.properties</value>
                <!--<value>file:///appl/conf/outlet.properties</value>-->
                <value>classpath:db.password</value>
                <value>file:${CATALINA_BASE}/lib/db.password</value>
                <!-- <ref bean="applPropertiesFromDb" /> -->
            </list>
        </property>
    </bean>

and Java file as:

@Value("${checkin.enabled}")
    private String checkinEnabled;

Answer 1

Use ReloadableResourceBundleMessageSource .

But this will not be refreshed.

private String checkinEnabled;

You must reload checkinEnabled variable.

Answer 2

Consider implementing MessageSource Spring bean like this:
1.Update applicationContext.xml

<bean id="messageSource" class="com.mycompany.service.DynamicMessageSource" />

2.Write your own MessageSource implementation

public class DynamicMessageSource extends AbstractMessageSource {

    // Autowire propertiesService

    @Override
    protected MessageFormat resolveCode(String code, Locale locale) {
        String result = propertiesService.getProperty(code);
        return new MessageFormat(result, locale);
    }
}

3.Implement your custom service to read properties from some place (DB, properties file, etc).
4.Enjoy dynamic updates of properties when updating the properties source.