Develop Reference

Spring RabbitMQ SimpleRabbitListenerContainerFactory usage

From the docs, I want to use consume from queues by dynamically changing the consumers without restarting the application.
I do see that Spring RabbitMQ latest version supports the same, but no clue/example/explanation to change the same. I couldn't see proper source code for the same or how to pass params like maxConcurrentConsumers
I am using XML based configuration of Spring RabbitMQ along with Spring integration
<bean id="rabbitListenerContainerFactory"
class="org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory">
<property name="connectionFactory" ref="rabbitConnectionFactory"/>
<property name="concurrentConsumers" value="3"/>
<property name="maxConcurrentConsumers" value="10"/>
<property name="acknowledgeMode" value="AUTO" />
</bean>
<int-amqp:inbound-channel-adapter channel="lowInboundChannel" queue-names="lowLoadQueue" advice-chain="retryInterceptor" acknowledge-mode="AUTO" listener-container="rabbitListenerContainerFactory" />
<int-amqp:inbound-channel-adapter channel="highInboundChannel" queue-names="highLoadQueue" advice-chain="retryInterceptor" acknowledge-mode="AUTO" listener-container="rabbitListenerContainerFactory" />
Can anyone guide me how to dynamically configure the consumers?

First of all you shouldn't share the same rabbitListenerContainerFactory for different <int-amqp:inbound-channel-adapter>s, because they do this:
protected void onInit() {
this.messageListenerContainer.setMessageListener(new ChannelAwareMessageListener() {
So, only last adapter wins.
From other side there is even no reason to have several adapters. You can specify queue-names="highLoadQueue,lowLoadQueue" for a single adapter.
Although in case of listener-container you must specify queues on the SimpleRabbitListenerContainerFactory.
If you want to change some rabbitListenerContainerFactory options at runtime, you can just inject it to some service and invoke its setters.
Let me know if I have missed anything.

Spring MVC - How can I use different timeouts for my resttemplates?

I am using Spring MVC with Spring 3.1. I have a web application that uses many REST services. One of these REST services takes up to an hour to respond - which I can not change. I have my timeout for the RestTemplate set up like this with the timeout set to 60 minutes:
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate ">
<constructor-arg>
<bean class="org.springframework.http.client.CommonsClientHttpRequestFactory">
<property name="readTimeout" value="3600000" />
<property name="connectTimeout" value="3600000" />
</bean>
</constructor-arg>
</bean>
I would like to be able to set all of my other REST calls to a different set of timeouts. Any ideas on how to do this?
Thanks,
Tim

You can't do this on a method call basis. In other words, all calls on the restTemplate bean will use the same underlying ClientHttpRequestFactory. If you want different requests to use different timeout values, declare multiple RestTemplate beans and inject the appropriate ones in your beans.

Concatenate strings within a Spring XML configuration file?

I have a String value in a Spring configuration file that comes to be as the result of a JNDI lookup -- it happens to be a path name:
<jee:jndi-lookup id="myAppHomeDir" jndi-name="myAppHomeDir" />
Now I need to concatenate on to the end of this path another string and hand it off to another Spring bean as follows (which of course doesn't work):
<bean id="LogPath" class="org.mystuff.initBean">
<property name="logDirectory">
<jee:jndi-lookup id="myAppHomeDir"
jndi-name="myAppHomeDir" /> + "/logs"
</property>
</bean>
Is there a simple way to do this without me having to write a utility class in Java?

Try using Spring EL (expression language). I would try the following (not tested):
<jee:jndi-lookup id="myAppHomeDir" jndi-name="myAppHomeDir" />
<bean id="LogPath" class="org.mystuff.initBean">
<property name="logDirectory" value="#{myAppHomeDir+'/logs'}"/>
</bean>
Not quite sure if it would work. The thing that troubles me is the cast from File (I guess) to String when concatenating. So if the previous one didn't work, I would try:
#{myAppHomeDir.canonicalPath+'/logs'}
Let us know if it works.

Spring Security 3.0 with jdbc

I read the "Spring Security 3 database authentication with Hibernate"! But I don't know how I should implementate it into my project!
In which document I have to set the password/username/drivers/url for the database?
I have different column titles like OPERATOR_ID/USR_ID/PASSWORD
OPERATOR_ID should be the login name, USR_ID the role and the password for the login
Please, maybe you could post an example which implements my questions? Maybe for a checkout or a *.war file?

I dont think there is any configuration as such for doing this. You have to implement the UserDetailsService which has only one method loadUserByUsername to load the user and you have to implement the same to load your user information from your database using hibernate.
See here

You would need to configure a JDBCDaoImpl bean which takes a Datasource as a parameter. How you retrieve the Datasource is up to you, you may grab it from the app server or use something like Spring's DriverManagerDatasource Here is some (pseudo) config
<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName"><value>your.driver.classname</value></property>
<property name="url"><value>yourDatabaseUrl</value></property>
<property name="username"><value>yourUsername</value></property>
<property name="password"><value>yourPassword</value></property>
</bean>
<bean id="dao" class="org.springframework.security.core.userdetails.jdbc.JdbcDaoImpl">
<property name="DataSource" ref="datasource" />
...
</bean>

conditional beans using spring

I am trying to write a ValidatorFactory which will give me a validator based on its type
public Validator getNewValidator(ValidatorType type){
switch:
case a : new Validator1();
break;
case b : new Validator2();
break;
}
I want to write using spring xml beans definition
I can use method injection but it will let me create only one object and the method does
not take any arguments.
I don't want to use FactoryBean.. I am just looking whether we can do this using spring xml
bean definition.

you can do conditional bean injection with plain xml. The "ref" attribute can be triggered by property values from a property file and thus create conditional beans depending on property values. This feature is not documented but it works perfect.
<bean id="validatorFactory" class="ValidatorFactory">
<property name="validator" ref="${validatorType}" />
</bean>
<bean id="validatorTypeOne" class="Validator1" lazy-init="true" />
<bean id="validatorTypeTwo" class="Validator2" lazy-init="true" />
And the content of the property file would be:
validatorType=validatorTypeOne
To use the property file in your xml just add this context to the top of your spring config
<context:property-placeholder location="classpath:app.properties" />

For complex cases (more complex than the one exposed), Spring JavaConfig could be your friend.

If you are using annotation (#Autowired, #Qualifier etc) instead of xml, you are not able to make conditional beans work (at least at current version 3). This is due to #Qualifier does not support expression
#Qualifier(value="${validatorType}")
More information is at https://stackoverflow.com/a/7813228/418439

I had an slightly different requirements. In my case I wanted to have encoded password in production but plain text in development. Also, I didn't have access to parent bean parentEncoder. This is how I managed to achieve that:
<bean id="plainTextPassword" class="org.springframework.security.authentication.encoding.PlaintextPasswordEncoder"/>
<bean id="shaPassword" class="org.springframework.security.authentication.encoding.ShaPasswordEncoder">
<constructor-arg type="int" value="256"/>
</bean>
<bean id="parentEncoder" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="targetSource">
<bean class="org.springframework.aop.target.HotSwappableTargetSource">
<constructor-arg ref="${password.encoding}Password"/>
</bean>
</property>
</bean>
Of course, I defined password.encoding in a property file with possible values as sha or plainText.

You should be able to do this:
<bean id="myValidator" factory-bean="validatorFactory" factory-method="getNewValidator" scope="prototype">
<constructor-arg><ref bean="validatorType"/></constructor-arg>
</bean>
<bean id="validatorType" ... />
Of course, it uses an automatically configured FactoryBean underneath but you avoid any Spring dependency in your code.