Java – how to run methods asynchronously using spring?

The following code assumes asynchronous work, but waits for the async part to complete and then continues How do I make the blah () method run asynchronously?

spring. xml

<?xml version="1.0" encoding="UTF-8"?>
<beans 
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:task="http://www.springframework.org/schema/task"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/task
        http://www.springframework.org/schema/task/spring-task-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
    ">

    <!-- Activates @Scheduled and @Async annotations for scheduling -->  
    <task:annotation-driven />

    <bean id="test"
        class="com.spring.test.Test">
</beans>

Test. java

@Path("/test")
public class Test
{
  @GET
  @Path("/test")
  @Produces("text/plain")
  public String tester()
  {
    return "Running...";
  }

  @GET
  @Path("/triggerNew")
  @Produces("text/plain")
  public String triggerNew()
  {
    System.out.println("BEFORE " + new Date() + " BEFORE");

    new Process().blah();

    System.out.println("AFTER " + new Date() + " AFTER");
    return "TRIGGERED";
  }
}

Process. java

@Component
    public class Process
    {
      @Async
      public void blah()
      {
        try
        {
          Thread.currentThread().sleep(5000);
        }
        catch (InterruptedException e)
        {
          e.printStackTrace(); 
        }
        System.out.println("NEW THREAD " + new Date() + " NEW THREAD");
      }
    }

Solution

@Async is only valid when annotating spring managed beans instead of arbitrary classes You need to define process as a spring bean and inject it into your controller class, such as

<bean id="test" class="com.spring.test.Test">
   <property name="process">
      <bean class="com.spring.test.Process"/>
   </property>
</bean>

public class Test {
   private Process process;

   public void setProcess(Process process) {
      this.process = process;
   }

   ...

   public String triggerNew() {  
      process.blah();
   }
}