Context loader control with Phased interface in Spring - spring

Question

I am trying to take under control the context loading process. As I can read in Spring reference documentation I determined to use Phased interface provided by Spring.
When starting, the objects with the lowest phase start first, and when
stopping, the reverse order is followed. Therefore, an object that
implements SmartLifecycle and whose getPhase() method returns
Integer.MIN_VALUE would be among the first to start and the last to
stop. At the other end of the spectrum, a phase value of
Integer.MAX_VALUE would indicate that the object should be started
last and stopped first (likely because it depends on other processes
to be running). When considering the phase value, it’s also important
to know that the default phase for any "normal" Lifecycle object that
does not implement SmartLifecycle would be 0. Therefore, any negative
phase value would indicate that an object should start before those
standard components (and stop after them), and vice versa for any
positive phase value.
public interface Phased {
int getPhase();
}
public interface SmartLifecycle extends Lifecycle, Phased {
boolean isAutoStartup();
void stop(Runnable callback);
}
Only I want load two controllers in phased after all others have been initialized.
To achieve this behaviour I have implemented the Phased Interface in both Spring Components.
#Service to be initialized at firstly.
#Service
public class BatchTaskController implements Phased{
#Autowired
private ActorService actorService;
#Autowired
private SessionFactory sessionFactory;
public BatchTaskController(){
this.batch();
}
public void batch(){
//TO DO...
}
#Override
public int getPhase() {
return 1;
}
}
#Controller to be initialized after batch task #Service.
#Controller
public class MainController implements Phased{
#Autowired
private ActorService actorService;
#Autowired
private SessionFactory sessionFactory;
#RequestMapping(value = {"/", "/index"})
public String showHome(HttpServletRequest request) {
//TO DO
return "index";
}
#Override
public int getPhase() {
return 2;
}
}
ActorService #Service not implement Phased Interface. Therefore I guess as I could read in the Spring Reference article exposed above that ActorService #Service is starting before than previous #Controllers because ActorService #Service phase valor was 0 by default.
But, when I deploy my app i get the next NullPointerException error.
04-04-2014 08:34:10,286 AM ERROR ContextLoader:331 - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'batchTaskController' defined in file [E:\Desarrollo\Spring\pjcomspringehcache\target\pjcomspringehcache-1.0-SNAPSHOT\WEB-INF\classes\com\pjcom\pjcomspringehcache\BatchTaskController.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.pjcom.pjcomspringehcache.BatchTaskController]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1076)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1021)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5158)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:579)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1744)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.uti
l.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.pjcom.pjcomspringehcache.BatchTaskController]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:164)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1069)
... 26 more
Caused by: java.lang.NullPointerException
at com.pjcom.pjcomspringehcache.BatchTaskController.batch(BatchTaskController.java:32)
at com.pjcom.pjcomspringehcache.BatchTaskController.<init>(BatchTaskController.java:23)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148)
... 28 more
Why?
SOLUTION
#Service to be initialized at firstly.
#Service
public class BatchTaskController implements Phased{
#Autowired
private ActorService actorService;
#Autowired
private SessionFactory sessionFactory;
#PostConstruct
public void batch(){
//TO DO...
}
#Override
public int getPhase() {
return 1;
}
}