Issue
I'm using Spring for DI. I write as follows at applicationContext.xml for Wicket, Hibernate and JMS. The issue is caused by jmsListener start before wicketApplication.<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<!-- The wicket application bean -->
<bean id="wicketApplication" class="my.project.MyWicketApplication" />
<!-- specifies the place holder for resources of the project -->
<bean id="placeholderConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="ignoreUnresolvablePlaceholders" value="false" />
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
<property name="ignoreResourceNotFound" value="false" />
<property name="locations">
<list>
<value>classpath*:/application.properties</value>
</list>
</property>
</bean>
<!-- JMS beans -->
<bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL" value="tcp://localhost:61616"/>
</bean>
<bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
<property name="connectionFactory" ref="connectionFactory"/>
</bean>
<bean id="destination" class="org.apache.activemq.command.ActiveMQQueue">
<constructor-arg index="0" value="ServerReceiveQueue"/>
</bean>
<bean id="jmsListener" class="my.project.jms.JmsListener"/>
<bean id="jmsContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
<property name="connectionFactory" ref="connectionFactory"/>
<property name="destination" ref="destination"/>
<property name="messageListener" ref="jmsListener"/>
</bean>
<!-- Data source, specifies the jdbc connection-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName">
<value>${jdbc.driver}</value>
</property>
<property name="url">
<value>${jdbc.url}</value>
</property>
<property name="username">
<value>${jdbc.username}</value>
</property>
<property name="password">
<value>${jdbc.password}</value>
</property>
</bean>
<!-- Transaction manager -->
<tx:annotation-driven transaction-manager="txManager" />
<!-- setup transaction manager -->
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<!-- Hibernate session factory -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.connection.pool_size">5</prop>
<prop key="hibernate.show_sql">false</prop>
</props>
</property>
<property name="packagesToScan">
<list>
<value>my.project.domain</value>
</list>
</property>
</bean>
<context:component-scan base-package="my.project" />
</beans>
The detail of issues..
"jmsListener" is instanciated before PropertyPlaceholderConfigurer start. When jmsListener start it receives some messages. And register some information at another class which has @Service annotation. But, after wicket application start, *maybe* Spring DI by PropertyPlaceholderConfigurer also instanciate several beans which have @Service annotation. And two instance which is instanciated not by PropertyPlaceholderConfigurer and by PropertyPlaceholderConfigurer seems to have different name. That means, even if the data was stored in a static object, it is not shared among them. So the wicket application can not access the data which jmsListener receives.Solution
I delay the start of jmsListener. Set autoStartup to "false" and call start() inside WicketApplication#init().<bean id="jmsContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
<property name="connectionFactory" ref="connectionFactory"/>
<property name="destination" ref="destination"/>
<property name="messageListener" ref="jmsListener"/>
<property name="autoStartup" value="false"/>
</bean>
public class MyWicketApplication extends WebApplication
{
@SpringBean
private DefaultMessageListenerContainer jmsContainer;
@Override
protected void init() {
super.init();
InjectorHolder.getInjector().inject(this);
jmsContainer.start();
}
}
Are there more smarter ways to solve the issue?
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