I want to make applicationContext inside scheduler method. it is possible ? )
<task:annotation-driven executor="executor" scheduler="scheduler"/>
<task:executor id="executor" pool-size="5"/>
<task:scheduler id="scheduler" pool-size="10"/>
And my class :
#Scheduled(fixedDelay=100)
public void doSomething() {
}
How me add that ? :
private ApplicationContext applicationContext;
#Override
public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
That use it code :
JDBCEntityDAO obj = (JDBCEntityDAO) applicationContext.getBean("taEntityDAO");
Help please
Just add #Autowired or any other dependency injection annotation to your job classes (the ones with #Scheduled - annotated methods). If you need a reference to the ApplicationContext, make your job implement the ApplicationContextAware interface.
This will work with the Spring native scheduler.
If you use Quartz, you'll have to do a little more work, see here inject bean reference into a Quartz job in Spring? .
By the way, you can use #Resourse annotation to inject beans by name.
Related
I am fairly new to Spring Boot and it is my sense from looking at sample applications that if a Bean Factory is ever used, it is used "under the covers" by Spring Boot. Or are there cases when using Spring Boot that you would in fact want to explicitly obtain a bean using the Bean Factory?
Every once in a while, I access Spring ApplicationContext from a bean that I initialize with new (basically a non-Spring managed bean) as follows:
#Component
public class ApplicationContextProvider implements ApplicationContextAware {
private static ApplicationContext context;
public static ApplicationContext getApplicationContext() {
return context;
}
#Override
public void setApplicationContext(ApplicationContext ac)
throws BeansException {
context = ac;
}
}
and in wherever I need it:
SomeBean someBean = ApplicationContextProvider.getApplicationContext().getBean("testBean", TestBean.class);
This is because:
I have to access a singleton (say, a #Service or a #Repository) from a bean I initialize (new) and I cannot make my bean Spring managed for that case. (so no #Autowired).
I don't want to introduce #Configurable to the project because it brings in AspectJ, which might be overkill to introduce for this simple case.
If I do
#Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
myBeans = applicationContext.getBeansOfType(MyBean.class).values();
}
does that have exactly the same effect as putting this in my constructor?
#Inject
public MyClass(Collection<MyBean> myBeans) {
this.myBeans = myBeans;
}
in commot case yes (without #Lazy ,#Value , required...), they are do the same effect.
In a Spring application, the two annotations works the same way as Spring has decided to support some JSR-299 annotations in addition to their own.
But there are some annotation that doen't hendled by #Inject like - laze , required as it's part of spring but not part of jsr.
Looks like if - all that you get by #Inject for Collection myBeans you get in spring also , but it's not true for all getted by spring also loaded by #inject
here is blog about comparison #AUTOWIRED AND #INJECT SPRING INJECTION WITH #RESOURCE, #AUTOWIRED AND #INJECT
I am dynamically adding contexts to the application context with the following code:
#Component
#Scope("singleton")
public class DynamicContextLoader implements ApplicationContextAware {
private static ApplicationContext context;
private Map<String, InterfacePropertyDto> contextMap;
#Autowired
IJpaDao jpaDao;
#PostConstruct
public void init() {
contextMap = (Map<String, InterfacePropertyDto>) context.getBean("contextMap");
contextMap.forEach((contextName, property) -> {
String p = jpaDao.getProperty(property.getPropertyName(), property.getPropertyType());
if (p != null) {
ConfigurableApplicationContext ctx = new ClassPathXmlApplicationContext(
new String[]{"/META-INF/spring/integration/" + contextName},
false, context);
ctx.refresh();
}
});
}
#Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
context = applicationContext;
}
}
This works well and all the beans defined in the new context are created. However the #Autowired does not work for any of these new beans.
For example a bean defined in the new context as:
<bean id="outboundContractJdbcFileMapper" class="com.......integration.model.contract.ContractMapper"/>
has the following autowiring:
public class ContractMapper implements RowMapper<ContractFile> {
#Autowired
IIntegrationDao integrationDao;
#Override
public ContractFile mapRow(ResultSet rs, int rowNum) throws SQLException {
......
}
}
At runtime the outboundContractJdbcFileMapper property integrationDao is null.
Is there a way to force the autowiring to occur when the beans are created? I was hoping that ctx.refresh() would do this.
That doesn't work automatically for the ClassPathXmlApplicationContext. You have to add <context:annotation-config/> to that child context as well:
<xsd:element name="annotation-config">
<xsd:annotation>
<xsd:documentation><![CDATA[
Activates various annotations to be detected in bean classes: Spring's #Required and
#Autowired, as well as JSR 250's #PostConstruct, #PreDestroy and #Resource (if available),
JAX-WS's #WebServiceRef (if available), EJB 3's #EJB (if available), and JPA's
#PersistenceContext and #PersistenceUnit (if available). Alternatively, you may
choose to activate the individual BeanPostProcessors for those annotations.
Note: This tag does not activate processing of Spring's #Transactional or EJB 3's
#TransactionAttribute annotation. Consider the use of the <tx:annotation-driven>
tag for that purpose.
See javadoc for org.springframework.context.annotation.AnnotationConfigApplicationContext
for information on code-based alternatives to bootstrapping annotation-driven support.
]]></xsd:documentation>
</xsd:annotation>
</xsd:element>
I have the following spring configuration:
<context:component-scan base-package="uk.co.mysite.googlecontactsync.aop"/>
<bean name="simpleEmailSender" class="uk.co.mysite.util.email.simple.SimpleEmailSenderImplementation"/>
<aop:aspectj-autoproxy/>
Then I have an aspect:
#Aspect
public class SyncLoggingAspect {
#Autowired
private SimpleEmailSender simpleEmailSender
#AfterReturning(value="execution(* uk.co.mysite.datasync.polling.Poller+.doPoll())", returning="pusher")
public void afterPoll(Pusher pusher) {
simpleEmailSender.send(new PusherEmail(pusher));
}
}
This aspect works (I can hit a breakpoint on afterPoll) but simpleEmailSender is null. Unfortunately I cannot find clear documentation on why this is. (For the record, my simpleEmailSender bean exists and is correctly wired into other classes) The following things confuse me:
Is context:component-scan supposed to be picking up #Aspect? If it is then surely it would be a spring managed bean, thus autowired should work?
If context:component-scan isn't for creating aspects, how is my aspect being created? I thought aop:aspectj-autoproxy just creates a beanPostProcessor to proxy my #Aspect class? How would it do this if it isn't a spring managed bean?
Obviously you can tell I don't have an understanding of how things should be working from the ground up.
The aspect is a singleton object and is created outside the Spring container. A solution with XML configuration is to use Spring's factory method to retrieve the aspect.
<bean id="syncLoggingAspect" class="uk.co.demo.SyncLoggingAspect"
factory-method="aspectOf" />
With this configuration the aspect will be treated as any other Spring bean and the autowiring will work as normal.
You have to use the factory-method also on Enum objects and other objects without a constructor or objects that are created outside the Spring container.
For Spring Boot to use #Autowired with AspectJ I have found the following method.
In configuration class add your aspect:
#Configuration
#ComponentScan("com.kirillch.eqrul")
public class AspectConfig {
#Bean
public EmailAspect theAspect() {
EmailAspect aspect = Aspects.aspectOf(EmailAspect.class);
return aspect;
}
}
Then you can successfully autowire your services in your aspect class:
#Aspect
public class EmailAspect {
#Autowired
EmailService emailService;
Another option is to add #Configurable to your aspect class instead of messing around with XML.
Configuring #Autowired with java config only (so no XML based configuration) requires a bit of extra work than just adding #Configuration to the class, as it also needs the aspectOf method.
What worked for me was creating a new class:
#Component
public class SpringApplicationContextHolder implements ApplicationContextAware {
private static ApplicationContext applicationContext = null;
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
#Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
}
And then use that in you aspect in conjunction with using #DependsOn #Configured and #Autowired:
#DependsOn("springApplicationContextHolder")
#Configuration
#Aspect
public class SomeAspect {
#Autowired
private SomeBean someBean;
public static SomeAspect aspectOf() {
return SpringApplicationContextHolder.getApplicationContext().getBean(SomeAspect.class);
}
The #DependsOn is needed because spring can't determine the dependency because the bean is used staticly.
I dont have 50 rep to comment on a question so here is another answer relating to #
Jitendra Vispute answer.
The official Spring doc mentions:
You may register aspect classes as regular beans in your Spring XML configuration, or autodetect them through classpath scanning - just like any other Spring-managed bean. However, note that the #Aspect annotation is not sufficient for autodetection in the classpath: For that purpose, you need to add a separate #Component annotation (or alternatively a custom stereotype annotation that qualifies, as per the rules of Spring’s component scanner).Source: Spring '4.1.7.Release' documentation.
This would mean that adding a #Component annotation and adding the #ComponentScan on your Configuration would make #Jitendra Vispute's example work. For the spring boot aop sample it worked, though I did not mess around with context refreshing.Spring boot aop sample:
Application:
package sample.aop;
#SpringBootApplication
public class SampleAopApplication implements CommandLineRunner {
// Simple example shows how an application can spy on itself with AOP
#Autowired
private HelloWorldService helloWorldService;
#Override
public void run(String... args) {
System.out.println(this.helloWorldService.getHelloMessage());
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleAopApplication.class, args);
}
}
The application should also run as plain Spring Framework application with the following annotations instead of #SpringBootApplication:
#Configuration
#EnableAspectJAutoProxy
#ComponentScan
and an AnnotationConfigApplicationContext instead of SpringApplication.
Service:
package sample.aop.service;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
#Component
public class HelloWorldService {
#Value("${name:World}")
private String name;
public String getHelloMessage() {
return "Hello " + this.name;
}
}
Monitor Aspect:
package sample.aop.monitor;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
#Aspect
#Component
public class ServiceMonitor {
#AfterReturning("execution(* sample..*Service.*(..))")
public void logServiceAccess(JoinPoint joinPoint) {
System.out.println("Completed: " + joinPoint);
}
}
This blog post explains it really well. Due to the fact that aspect singleton is created outside spring container you'd need to use factory-method=”aspectOf” that is only available after it is woven in by AspectJ ( not Spring AOP ) :
Notice factory-method=”aspectOf” that tells Spring to use a real
AspectJ ( not Spring AOP ) aspect to create this bean. So that after
the aspect is woven in it has an
“aspectOf” method.
So that :
No matching factory method found: factory method 'aspectOf()' - That
would mean that the aspect was not woven by AspectJ weaver.
From my experience with spring 3.1, if I don't use #Autowired but traditional setter for dependency injection, it gets injected and works as expected without aspectJ weaver. Although I'm encountering problems with the aspect being singleton... It results in 'perthis' instantiation model.
.
Add #Component to aspect class and your dependencies should get injected automatically.
and add context:component-scan for package where your aspect is in spring context file.
#Component
#Aspect
public class SomeAspect {
/* following dependency should get injected */
#Autowired
SomeTask someTask;
/* rest of code */
}
Use compile time weaving, see for plugin example at: https://github.com/avner-levy/minimal_spring_hibernate_maven_setup/blob/master/pom.xml
The following combination of annotation and Spring config works for me thanks to notes above by Tobias/Willie/Eric:
Class:
package com.abc
#Configurable
#Aspect
public class MyAspect {
#Autowired
protected SomeType someAutoWiredField;
}
XML:
<context:spring-configured />
<context:component-scan base-package="com.abc" />
#Configurable(autowire = Autowire.BY_TYPE)
Add this annotation to your Aspectj class. Then it will be handled by Spring IOC.
For Spring Boot using #Autowired in #Aspect,
my way is using spring.factories configuration file
create a file named spring.factories in src/main/resources
the file content is as following
org.springframework.boot.autoconfigure.EnableAutoConfiguration=pack.age.to.YourAspect,pack.age.to.YourDAO
I'm new to Spring/Spring Mvc and here's my problem. In my webapp, besides the spring-servlet.xml , I have a jdbc.xml which define beans like datasource, dao ... Before using contextloaderlistener , I load my jdbc.xml inside the Controller's constructor like this ApplicationContext context = new ClassPathXmlApplicationContext("jdbcbeans.xml") then get the beans from that. But since I'm using contextloaderlistener to load the file, how can I get the reference to the context ? I was able to set up everything using those #Autowired things but I just want to know is there any way to do that ?
You can use WebApplicationContextUtils.
ApplicationContext context;
context = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
See here for details.
You can do the following to get an instance of Application Context
in case of a container managed bean use ApplicationContextAware interface
public class MyBean implements ApplicationContextAware {
private static ApplicationContext context;
public void setApplicationContext(ApplicationContext acontext) throws BeansException {
context = context;
}
public static ApplicationContext getApplicationContext() {
return context;
}
}
Or you can write the following
#Autowired
private ApplicationContext Context;
An instance of the Application Context will be autowired.