org.quartz-scheduler nullify the reference of repository in the executeInternal(JobExecutionContext executionContext) why? - quartz-scheduler

Question

Its an observation and would like to share the information to know why executeInternal() nullify the reference of customerRepository? I was developing Spring + Quartz + Spring Data JPA example. In this example I was looking to run the multiple jobs at the same time by providing implementation of JobDetailFactoryBean. In jobA.java class I experience an issue....
JobA.java
#Service
public class JobA extends QuartzJobBean {
private CustomerRepository customerRepository = null;
#Autowired
public JobA(CustomerRepository customerRepository) {
this.customerRepository = customerRepository;
}
public JobA() { }
#Override
protected void executeInternal(JobExecutionContext executionContext) throws JobExecutionException {
System.out.println("~~~~~~~ Job A is runing ~~~~~~~~");
Trigger trigger = executionContext.getTrigger();
System.out.println(trigger.getPreviousFireTime());
System.out.println(trigger.getNextFireTime());
getCustomerList();
}
private List<Customer> getCustomerList(){
List<Customer> customers = customerRepository.findAll();
for (Customer customer : customers) {
System.out.println("------------------------------");
System.out.println("ID : "+customer.getId());
System.out.println("NAME : "+customer.getName());
System.out.println("STATUS : "+customer.getStatus());
}
return customers;
}
}
I can't use the customerRepository instance in the executeInternal() why ? If I getCustomerList() from public JobA(CustomerRepository customerRepository) { it works fine there, but if I use from executeInternal(), it nullify the reference of customerRepository why ?
Spring-Quartz.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:repository="http://www.springframework.org/schema/data/repository"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/data/repository http://www.springframework.org/schema/data/repository/spring-repository.xsd">
<import resource="classpath:dataSourceContext.xml"/>
<jpa:repositories base-package="com.mkyong.repository" />
<context:component-scan base-package="com.mkyong.*" />
<context:annotation-config />
<bean id="jobA" class="com.mkyong.job.JobA" />
<bean id="jobB" class="com.mkyong.job.JobB" />
<bean id="jobC" class="com.mkyong.job.JobC" />
<!-- ~~~~~~~~~ Quartz Job ~~~~~~~~~~ -->
<bean name="JobA" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
<property name="jobClass" value="com.mkyong.job.JobA" />
</bean>
<bean name="JobB" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
<property name="jobClass" value="com.mkyong.job.JobB" />
</bean>
<bean name="JobC" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
<property name="jobClass" value="com.mkyong.job.JobC" />
</bean>
<!-- ~~~~~~~~~~~ Cron Trigger, run every 5 seconds ~~~~~~~~~~~~~ -->
<bean id="cronTriggerJobA" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
<property name="jobDetail" ref="JobA" />
<property name="cronExpression" value="0/5 * * * * ?" />
</bean>
<bean id="cronTriggerJobB" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
<property name="jobDetail" ref="JobB" />
<property name="cronExpression" value="0/5 * * * * ?" />
</bean>
<bean id="cronTriggerJobC" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
<property name="jobDetail" ref="JobC" />
<property name="cronExpression" value="0/5 * * * * ?" />
</bean>
<!-- ~~~~~~~~~~~~~~~~ Scheduler bean Factory ~~~~~~~~~~~~~~~~ -->
<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
<ref bean="cronTriggerJobA" />
<!-- <ref bean="cronTriggerJobB" />
<ref bean="cronTriggerJobC" /> -->
</list>
</property>
</bean>
</beans>
dataSourceContext.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:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">
<context:property-placeholder location="classpath:database.properties"/>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"/>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${mysql.driver.class.name}" />
<property name="url" value="${mysql.url}" />
<property name="username" value="${mysql.username}" />
<property name="password" value="${mysql.password}" />
</bean>
<bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"/>
<property name="generateDdl" value="true"/>
<property name="database" value="${database.vendor}"/>
</bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>
<!-- spring based scanning for entity classes-->
<property name="packagesToScan" value="com.mkyong.*"/>
</bean>
</beans>
App.java
public class App {
public static void main(String[] args) throws Exception {
ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Quartz.xml");
}
}

Answer 1

Where are you define the customerRepository bean? you should define it in the xml file, or add #Repository annonation in the class.