annotations

问题 This question already has answers here : How to write an annotation/aspect to not enter a method but return null if a given condition is false? (2 answers) Closed last year . Is there a Spring AOP annotation which lets us go inside a method only if that annotation returns true? I want something like this: @CustomAnnotation public String foo(){ System.out.println("Hello World"); return "foo"; } So now only when the @CustomAnnotation returns true is when we will go inside the foo() method &

问题 How RuntimeAnnotationReader can be used for JAXB annotations to read Custom Annotations and control class fields at runtime.While searching on google i found this link http://glassfish.10926.n7.nabble.com/injecting-JAXB-annotations-at-runtime-td59852.html but i couldn't gather much information about RuntimeAnnotationReader. I have the following reqirement: Suppose I have a class name Person.java import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType;

问题 I try to made simple JSF example and have several filers. I use Maven, and have stored in META-INF flolder faces-confid.xml.. In output when try to execute i see : Welcome to JSF. #{test.test} But I think it must be somthing else. Here they are: Bean file import java.io.Serializable; import javax.enterprise.context.RequestScoped; import javax.inject.Named; @Named("test") @RequestScoped public class TestBean implements Serializable{ private String test = "test"; public String getTest() {

问题 Using annotations; how do i pass arguments values to a method ? Example in the below code "How can i pass arguments (2 strings) values for loadProperties API method" through annotations when Autowiring of confProps instance? I can use @javax.inject.Named at method argument level; but is there any equivalent for this in Spring to use at method argument level? I am not able to use @Component at the argument level. Can i use these @Value("#{XXX}") OR @Qualifier("") to resolve my issue? These two

问题 I will implement an entity class, something like: @Entity public class XXXEntity { @Id private Long id; private Object entity; } But I am not sure how to map the Object type field? Actually, in my project the object types contain several other entities, like A, B, C. (all A,B, and C implement Serilizable interface) I want to annotate it as @Lob, but I am not sure it is correct? Because Object doesn't implement Serilizable interface. Any ideas about that? Thanks. 回答1: You can not annotate

问题 Using Symfony annotation for example for routing is quite amazing, but I wonder how this framework parse the comments and extract the annotation? For example: /** * @Route("/tehran", name="tehran") */ and then use it as a route to next controller method. 回答1: Symfony uses the Doctrine Annotations module to parse the docblock from your class. See: https://github.com/doctrine/annotations https://doctrine-common.readthedocs.io/en/latest/reference/annotations.html It uses Reflection class to read

问题 i have a map and the map have annotation , and i can see these annotation in table view as a cells then i can see the details for any cell i selected like the master details project in the xcode like this - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([[segue identifier] isEqualToString:@"showDetail"]) { NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; Object *object = [self.objects objectAtIndex:indexPath.row]; DetailsViewController

问题 Hello guys i am new to hibernate. while i was surfing stack overflow for hibernate related topics i found this Need clarification about mapping objects to database, annotations, and one to many relationships after reading the solution i was a bit confused and started building the exact scenario to understand the actual mechanism behind many to one, where i used oracle 11g database. When i am running my project hibernate is generating the tables and FK relations automatically but in the time

问题 HiAll, I was confused by the EclipseLink for Tomcat documentation saying: Limitations to JPA: No @PersistenceContext injection of a container managed persistence unit is available - use Persistence.createEntityManagerFactory(JTA_PU_NAME) and, also by this question&answer: but the typical JPA configuration in Spring looks like this, so you don't need to create EntityManager manually : @PersistenceContext private EntityManager em; So, the question is: may I use this annotation

问题 Repeating Annotations as @Scheduled allow multiple annotations But it also allows duplicated values in different annotation which can cause unexpected results Simple example using Scheduled with duplicated fixedRate values: private static final long TIME = 1000 * 60 * 1L; // 1 minute private static final long TIME2 = 1000 * 60 * 1L; // 1 minute @Scheduled(fixedRate = TIME) @Scheduled(fixedRate = TIME2) public synchronized void refresh() { It will execute twice per minute the schedule task