logo
down
shadow

When do I have to create new instance while using @Autowired


When do I have to create new instance while using @Autowired

Content Index :

When do I have to create new instance while using @Autowired
Tag : java , By : unfool
Date : November 23 2020, 04:01 AM

I hope this helps you . When you instantiate a bean itself, it does not make it managed anymore and thus all of the @Autowired dependencies will not be processed. In order to make sure that dependencies are injected properly, you will need to instantiate the bean through the Spring context. Spring needs to instantiate the whole beans trail in order to perform the dependency injection properly. Please check the IoC details in this link: https://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/beans.html#beans-factory-class-ctor
Looking at your code, there are two ways to do this
@SpringBootApplication
public class RestApiApplication implements CommandLineRunner {

    @Autowired
    private TaskScheduler ts;

    public static void main(String[] args) {
        SpringApplication.run(RestApiApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        ts.<your-code>
    }

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

AutoWired Setters rather than AutoWired instance variables in Spring


Tag : java , By : barefootChild
Date : March 29 2020, 07:55 AM
may help you . Some observations from me (actually 3 years in Java EE):
Advantages:

@Autowired service is null but I need create new instance


Tag : java , By : Praetoriansentry
Date : March 29 2020, 07:55 AM
wish of those help I'm developing an app with Spring boot, I'm using the MVC model. I have an entity called A, which has its controller, service and repository. all right up here. , If you need to do some task periodically:
@SpringBootApplication
@EnableScheduling
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application .class, args);
    }
}

@Component
class Runner {

    @Autowired
    private Service service;

    @Scheduled(cron = "0 */2 * * * ?") // execute every 2 hours
    public void run() {
        // put your logic here
    }
}

@Autowired not work inside class that class instance create using reflection


Tag : java , By : user119985
Date : March 29 2020, 07:55 AM
should help you out Spring can't inject anything in an instance that you create yourself with new or via reflection.
One of the ways to do what you want would be to request the beans from the application context, something along the following lines:

@Autowired 
private ApplicationContext applicationContext;

public void createUser(Class<?> beanClass) {
    ILogic logic = applicationContext.getBean(beanClass);
    logic.saveUser();
}

Is there way to reload autowired instance or replace autowired behavior in spring


Tag : java , By : Patastroph
Date : March 29 2020, 07:55 AM
wish helps you Your approach is very wrong. Autowiring is for connecting dependencies at startup. (It is actually discouraged these days, in favour of constructor argument injection.)
What you probably need is to have a @Service which retrieves the data model from the remote service. You then inject this service in the classes that need it to get the model.
@Service
public class ModelService {

  private final RestTemplate restTemplate;

  public ModelService(RestTemplate restTemplate) {
    this.restTemplate = restTemplate;
  }

  @Cacheable(value = "model", key = "#root.methodName")
  public Model getModel() {

    MetadataReader metadataReader = new MetadataReader();
    String prismFormatJson = null;
    if (!isHasLatestTransformedJson()) {
        prismFormatJson = metadataReader.transformToPrismJson(restTemplate, environment);
        setLastGoodPrismConfiguration(prismFormatJson);
    } else {
        prismFormatJson = getLastGoodPrismConfiguration();
    }
    if (model != null) {
        return model;
    } else {
        return metadataReader.createModelForPrism(prismFormatJson);
    }
  }

  //... the rest of the code
}
<config
  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
  xmlns='http://www.ehcache.org/v3'
  xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
  xsi:schemaLocation="
  http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
  http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

  <service>
    <jsr107:defaults>
      <jsr107:cache name="model" template="model-cache"/>
    </jsr107:defaults>
  </service>

  <cache-template name="model-cache">
    <expiry>
      <ttl unit="minutes">10</ttl>
    </expiry>
  </cache-template>
</config>

How can i create constructor with autowired and non autowired fields simultaniosly?


Tag : java , By : Fahad
Date : January 02 2021, 06:48 AM
like below fixes the issue You need to create your bean explicitly in the configuration. You don't need any autowiring inside your class:
public class EditSite{
  private final A a;
  private final B b;
  private final C c;

  private Site site;

  public EditSite(Site site, A a, B b , C c) {
      this.site=site;
      this.a = a;
      this.b = b;
      this.c = c;
  }

  public void run(){ check(); }
  public void check(){}
}
@Configuration
public class EditSiteConfig {

  @Bean
  public EditSite editSite(A a, B b, C c){
    Site site = getSite(); //since site is not a bean, you need to get it manually
    return new EditSite(site, a, b, c);
  }

}
Related Posts Related QUESTIONS :
  • Assert progress of ProgressBar in Espresso test
  • How to detect if gson.fromjson() has excess elements
  • I cant generate the proper code to select the a specific filter on a BI dashboard I am working on
  • How to Inject Dependencies into a Servlet Filter with Spring Boot Filter Registration Bean?
  • Thrift types as a Generic
  • Effective algorithm to random 4 unique integers less than a big max such as 100_000
  • Combining or and negation in Java regex?
  • Unable to instantiate default tuplizer Exception
  • Multi-tenant migration to work with quarkus
  • Ignite persisting a Set: Cannot find metadata for object with compact footer
  • Maven cannot resolve Jacob dependency using eclipse
  • testcontainers oracle database container starts before database user is created
  • Launching two spring boot apps in integration test
  • Is there a way to add a HashMap's value that is a integer array into a ArrayList?
  • Is there any way that I can get a parameter in paintComponent?
  • Empty stack with one recursive method and one iterative method
  • What's the behavior of onBackpressureBuffer in RxJava2
  • Java regex can only use 1 quantifier in a lookback (need 2)
  • How to fix error in native query : it is showing syntax error near or at
  • How to retrieve nested object from a document and display it in FirestoreRecyclerOptions?
  • Why not use ListIterator for full LinkedList Operation?
  • Android Webview EvaluateJavascript sometimes does not return a response
  • Matcher java doesn't work but regex seems to be good
  • Finding dimensions of a .gif file
  • Java Number format how to change +/- sign to custom text
  • Entity partially saved when using JOINED inheritance strategy and setting spring.jpa.properties.hibernate.jdbc.batch_siz
  • Stored Procedure in Java Spring Boot Project returns null as Output
  • How to solve org.hibernate.MappingException which is causing due to inheriting a class
  • Clean Archtecture. Understanding of scheme
  • Processing 3 triangle not showing in Javafx 8 Window tab
  • How to specify a sequence-based generated value in Hibernate 5 via legacy mapping
  • Spring-boot application not getting auto-deployed on startup
  • How to only pass strings that the user select
  • Is there a way to SELECT using "GREATEST(field1, field2)" where field1 and field2 are aggregate sums in the sa
  • How to handle JSON objects wrapped into one JSON object with retrofit2?
  • Configure Hazelcast CPSubsystem Retries Timeout
  • how to use onBindViewHolder with multiple items in android RecyclerView
  • No ParameterResolver registered for parameter in BeforeAll method
  • Finding the path in a graph with the least casualties according to the lanchester square law
  • MongoWriteException when inserting into Mongodb with composite custom _id
  • Fetch Oracle procedure metadata with Java when multiple procedure signatures
  • Value modification of key-pair in HashMap and impact for a HashCode
  • Migration from solrj to spring-data-solr
  • How to check if you're still connected to the database with jpa
  • Use Date type in the graphql scheme
  • Split and add the string based on length
  • Is "main" method of spring boot application required when deploy as war
  • Getting the average within specific numbers in an array
  • how to use izpack to make my jar application to installer?
  • What is meant by src in Java Eclipse?
  • Create a mirrored linked list in Java
  • Examples of good JPA Java Desktop Application
  • Translate Java to Python -- signing strings with PEM certificate files
  • Algorithm Analysis tool for java
  • Java serial comm API - what does inputstream.read() return if a timeout occurs?
  • How do I make a background thread in Java that allows the main application to exit completely? This works in Linux, but
  • How to add an image dynamically at runtime in java
  • Java App on Mac asking for allow network connections everytime
  • Best actively maintained Java XMPP Library?
  • Multi-Threaded Application - Help with some pseudo code!
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com