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What does the @Value annotation in method do?


What does the @Value annotation in method do?

By : jjoo3333
Date : November 21 2020, 04:03 PM
hope this fix your issue Basically it tells Spring's AutowiredAnnotationBeanPostProcessor to call the setSomething method with the resolved value of some.property as the argument... but only if you have a PropertySourcesPlaceholderConfigurer in your bean definitions; if you haven't configured one the post processor will only inject the string "${some.property}"(without quotes) to your method.
An IllegalArgumentException will be thrown if the value could not be resolved unless you have used a default e.g. "${some.property:default}".
code :


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Java annotation execute a method within the annotation declaration(usage for android)

Java annotation execute a method within the annotation declaration(usage for android)


By : user8675309
Date : March 29 2020, 07:55 AM
Does that help Annotations are meta data. What you need to write is an annotation processor. An annotation in itself cannot accomplish the validation logic. The annotation processor will look at the annotations and then do the validation and control the application flow. This SO answer has a good explanation Can Java Annotations help me with this?
You also need to annotate the annotation with @Retention(RetentionPolicy.RUNTIME) so that the annotation information is preserved till the runtime.
code :
@Retention(RetentionPolicy.RUNTIME) 
public @interface Validate() {
}
RequestMapping annotation leads to empty RequestMethod array when looking up annotation for the controller method

RequestMapping annotation leads to empty RequestMethod array when looking up annotation for the controller method


By : Malik Jezi
Date : March 29 2020, 07:55 AM
hope this fix your issue I created a little sample project out of my own curiosity and fiddled a little with the MetadataReader provided by Spring. For the demo I created a very simple controller which looked like this:
code :
@Controller
public class SomeAnnotatedController {

   @RequestMapping(method = {RequestMethod.GET}, value = "/someUrl")
   public void someMethod() {
       // do something later
   }

}
@Test
public void shouldReturnMethodArrayWithSpringMetadataReader() throws Exception {
    MetadataReader metadataReader = new CachingMetadataReaderFactory().getMetadataReader(SomeAnnotatedController.class.getName());
    Set<MethodMetadata> annotatedMethods = metadataReader.getAnnotationMetadata().getAnnotatedMethods(RequestMapping.class.getName());
    assertEquals(1, annotatedMethods.size());
    MethodMetadata methodMetadata = annotatedMethods.iterator().next();
    assertEquals("someMethod", methodMetadata.getMethodName());
    Map<String, Object> annotationAttributes = methodMetadata.getAnnotationAttributes(RequestMapping.class.getName());
    assertTrue(annotationAttributes.containsKey("method"));
    RequestMethod[] methodAttribute = (RequestMethod[]) annotationAttributes.get("method");
    assertEquals(1, methodAttribute.length);
}
java.lang.AssertionError: 
Expected :1
Actual   :0
@Test
public void shouldReturnMethodArrayWithPlainJava() throws Exception {
    Method method = SomeAnnotatedController.class.getDeclaredMethod("someMethod");
    RequestMapping annotation = method.getAnnotation(RequestMapping.class);
    assertEquals(1, annotation.method().length);
    assertEquals(RequestMethod.GET, annotation.method()[0]);
}
@AspectJ Class level Annotation Advice with Annotation as method argument

@AspectJ Class level Annotation Advice with Annotation as method argument


By : Mickel.Malik
Date : March 29 2020, 07:55 AM
like below fixes the issue The solution is actually quite simple. I am writing my code in native AspectJ style, I prefer it for clarity. You will be easily able to adjust it to @AspectJ annotation style:
code :
public aspect LogTimeAspect {
    pointcut publicMethod() : execution(public * *(..));

    before(LogExecutionTime logAnn) : publicMethod() && @annotation(logAnn) {
        System.out.println(thisJoinPointStaticPart + " -> " + logAnn.level());
    }

    before(LogExecutionTime logAnn) : publicMethod() && @within(logAnn) {
        System.out.println(thisJoinPointStaticPart + " -> " + logAnn.level());
    }
}
execution(void Operator.operate()) -> Method_Level_Invocation
execution(void Operator.operate()) -> Class_Level_Invocation
execution(void Operator.operate1()) -> Class_Level_Invocation
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class LogTimeAspect {
    @Pointcut("execution(public * *(..))")
    public void publicMethod() {}

    @Around("publicMethod() && @annotation(logAnn)")
    public Object LogExecutionTimeByMethod(ProceedingJoinPoint joinPoint, LogExecutionTime logAnn) throws Throwable {
        System.out.println(joinPoint + " -> " + logAnn.level());
        return joinPoint.proceed();
    }

    @Around("publicMethod() && @within(logAnn)")
    public Object LogExecutionTimeByClass(ProceedingJoinPoint joinPoint, LogExecutionTime logAnn) throws Throwable {
        System.out.println(joinPoint + " -> " + logAnn.level());
        return joinPoint.proceed();
    }
}
JetBrains ReSharper C# Annotation StringFormatMethodAttribute I need an extension method form or custom annotation

JetBrains ReSharper C# Annotation StringFormatMethodAttribute I need an extension method form or custom annotation


By : Rupinder Kaur
Date : March 29 2020, 07:55 AM
Hope that helps Stuartd provided the answer, the coding example should have the parameter to StringFormatMethod changed to be "format". He provides link to ReSharper documentation for this as well.
code :
[StringFormatMethod("format")]
public static void FinestFormat(this ILog log, string format, params object[] args)
{
    log.DoLogFormat(log4net.Core.Level.Finest, format, args);
}
Spring AOP : Interface method with Parameter annotation captured, but annotation is not present

Spring AOP : Interface method with Parameter annotation captured, but annotation is not present


By : Moe
Date : March 29 2020, 07:55 AM
wish of those help I'm using Spring AOP to intercept a method execution. , The answers to your questions:
code :
@Override
public Response doThings(int id, @AwesomeAnnotation SomeClass instance) {
    // ...
}
@Aspect
@Component
public class MyAwesomeAspect {
    @Pointcut("execution(public * *..MyAwesomeService.*(*, @*..AwesomeAnnotation (*), ..)) && args(*, instance, ..)")
    static void myPointcut(SomeClass instance) {}

    @Around("myPointcut(instance)")
    public Object doAwesomeStuff(Object instance, ProceedingJoinPoint proceedingJoinPoint) {
        System.out.println(proceedingJoinPoint);
        System.out.println("  instance = " + instance);
        MethodSignature methodSignature = (MethodSignature) proceedingJoinPoint.getSignature();
         Annotation[][] annotationMatrix = methodSignature.getMethod().getParameterAnnotations();
         for (Annotation[] annotations : annotationMatrix) {
             for (Annotation annotation : annotations) {
                 System.out.println("  annotation = " + annotation);
             }
         }
         return proceedingJoinPoint.proceed();
    }
}
execution(Response de.scrum_master.app.MyAwesomeServiceImpl.doThings(int, SomeClass))
  instance = de.scrum_master.app.SomeClass@23fc625e
  annotation = @de.scrum_master.app.AwesomeAnnotation()
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