You have three options to update singleton bean in spring context, you can chose one suitable for your use case: Reload method In the Bean Create a method in your bean which will update/reload its properties. Based on your trigger, access the bean from spring context, and then call the reload method to update bean … Read more
For the benefit of others, I will present below what I have gathered from my investigations: As long as the prototype bean does not itself hold a reference to another resource such as a database connection or a session object, it will get garbage collected as soon as all references to the object have been … Read more
Below should be possible sequence beanb starts to get autowired During class initialization of Beanb, beana starts to get autowired Once beana gets created the @PostConstruct i.e. init() of beana gets called Inside init(), System.out.println(“bean a is called”); gets called Then b.printMe(); gets called causing System.out.println(“print me is called in Bean B”); to execute Having … Read more
You can use a prototype bean along with a BeanFactory. @Configuration public class AppConfig { @Autowired Dao dao; @Bean @Scope(value = “prototype”) public FixedLengthReport fixedLengthReport(String sourceSystem) { return new TdctFixedLengthReport(sourceSystem, dao); } } @Scope(value = “prototype”) means that Spring will not instantiate the bean right on start, but will do it later on demand. Now, … Read more
What you are asking is already available in Spring reference By default, configuration classes use a @Bean method’s name as the name of the resulting bean. This functionality can be overridden, however, with the name attribute. @Configuration public class AppConfig { @Bean(name = “myFoo”) public Foo foo() { return new Foo(); } }
JavaBeans: At a basic level, JavaBeans are simply Java classes which adhere to certain coding conventions. Specifically, classes that have public default (no argument) constructors allow access to their properties using accessor (getter and setter) methods implement java.io.Serializable Spring Beans: A Spring bean is basically an object managed by Spring. More specifically, it is an … Read more
1. Implement a custom Condition public class LinuxCondition implements Condition { @Override public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) { return context.getEnvironment().getProperty(“os.name”).contains(“Linux”); } } Same for Windows. 2. Use @Conditional in your Configuration class @Configuration public class MyConfiguration { @Bean @Conditional(LinuxCondition.class) public MyService getMyLinuxService() { return new LinuxService(); } @Bean @Conditional(WindowsCondition.class) public MyService getMyWindowsService() { return … Read more
You need the @Value annotation. A common use case is to assign default field values using “#{systemProperties.myProp}” style expressions. public class SimpleMovieLister { private MovieFinder movieFinder; private String defaultLocale; @Autowired public void configure(MovieFinder movieFinder, @Value(“#{ systemProperties[‘user.region’] }”) String defaultLocale) { this.movieFinder = movieFinder; this.defaultLocale = defaultLocale; } // … } See: Expression Language > Annotation … Read more
What is the correct way to specify that @Value is not required? Working on the assumption that by ‘not required’ you mean null then… You have correctly noted that you can supply a default value to the right of a : character. Your example was @Value(“${myValue:DEFAULT}”). You are not limited to plain strings as default … Read more