Develop Reference

Get Hostname during tomcat-application deployment

I have a task to use hostname in Spring-database-configuration.
For example, when app deployed on localhost db-requests to be send at localhost:5432/database, othewise - on (for example) 172.18.0.2:5432/database.
I'am trying to use Spring SpEL for this purpose:
<bean id="dataSource"
class="org.apache.tomcat.jdbc.pool.DataSource"
p:driverClassName="org.postgresql.Driver"
p:url="#{'jdbc:postgresql://' + #bUrl.getHost=='localhost'?'localhost':'172.18.0.2' + ':5432/infostock'}"
/>
In this expression I need to identify bUrl. It must containt info about hostname.
But how could I get this info:
<bean class="java.net.URI" id="bUrl">
<constructor-arg value="${???????}"/>
</bean>
Is there are special variables?
I tried to get hostname from HttpServletRequest, but the problem is that application able to fullfill requests after stage of deploying.

IBM MQ and Spring Integration - security settings

I've got a Spring Integration flow which uses an inbound gateway to get messages from an IBM MQ queue:
<int-jms:inbound-gateway id="InputGateway"
request-destination="RequestQueue"
request-channel="RequestChannel"
reply-channel="ReplyChannel"
/>
However I'm not capable of assigning security settings. In particular, I need an username, password and userAuthenticationMQCSP = false (for reasons beyond the scope of this post, I won't get into details but my broker will throw a MQRC = 2009 otherwise).
I've followed the IBM guide to connect with jmsTemplate and works just fine. This uses the official Spring boot starter from IBM MQ which will kindly create a connection factory and will autoconfigure it with some defaults from application.properties:
ibm.mq.queueManager=myQMName
ibm.mq.channel=myChannel
ibm.mq.connName=myhostname(myPort)
ibm.mq.user=username
ibm.mq.password=*******
ibm.mq.userAuthenticationMQCSP=false
Now, back to the Spring Integration case. According to the int-jms:inbound-gateway spec, a connectionFactory will be injected to the gateway, by name (attribute: connection-factory) which is set up to be "jmsConnectionFactory" by default
By default, all of the JMS adapters that require a reference to the
ConnectionFactory automatically look for a bean named
jmsConnectionFactory. That is why you do not see a connection-factory
attribute in many of the examples. However, if your JMS
ConnectionFactory has a different bean name, you need to provide that
attribute.
I don't see any way to set up a predictable name for the connection factory that I can plug into the int-jms:inbound-gateway.
Now, taking a different approach, as per this example I've created my connectionFactory with an adecuate name:
<bean id="jmsConnectionFactory" class="com.ibm.mq.jms.MQQueueConnectionFactory">
<property name="transportType" value="1"/>
<property name="queueManager" value="myQMName"/>
<property name="hostName" value="myhostname"/>
<property name="port" value="myPort" />
<property name="channel" value="myChannel"/>
</bean>
But now I need somewhere to put the credentials and the security parameters. Looking at the example above, it looks like I need to plug something like:
<bean id="secureJmsConnectionAdapter" class="**yourpackages.SecureJMSConnectionAdapter**">
<property name="targetConnectionFactory" ref="${jms.mq.connection.factory}" />
<property name="userName" value="${jms.username}"/>
<property name="pwdAlias" value="${jms.alias}"/>
</bean>
However it is unclear to me how to implement this SecureJMSConnectionAdapter.
Additionally, if I set up my own connection factory, I will lose all of MQ boot starter automagic thanks to this annotation on the MQAutoConfiguration class:
#ConditionalOnMissingBean(value=javax.jms.ConnectionFactory.class)
Any ideas on how to put these pieces together?
EDIT: Just to avoid any possible red herrings to anyone, the MQRC2009 was irrelevant to ibm.mq.userAuthenticationMQCSP=false.

Some of my old projects I used a bean like this:
<bean id="jmsQueueConnectionFactory"
class="org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter">
<property name="targetConnectionFactory" ref="jmsConnectionFactory"/>
<property name="username" value="${jms.username}"/>
<property name="password" value="${jms.alias}"/>
</bean>
Should work well as a wrapper for your com.ibm.mq.jms.MQQueueConnectionFactory, but you have to use this jmsQueueConnectionFactory in the target components.
Although it looks like the mentioned IBM MQ JMS Spring doesn't that for us properly exposing a jmsConnectionFactory bean. You can rely on the default from Spring Integration in this case or use that jmsConnectionFactory explicitly for the connection-factory.
Also with Spring Boot you should consider to go away from XML configuration and give a chance for Spring Integration Java DSL: https://docs.spring.io/spring-integration/docs/5.1.7.RELEASE/reference/html/#java-dsl

Spring + RMI how to limit concurrent connection from client to server

Hi i work on java project with spring framework and implement client-server side with Spring RMI is there anyway to limit concurrent client call to server? i try google around and found that spring provide Security container package that can limit number of concurrent per authenticated user which i don't thik it is what i look for
here is server-side config provided in spring's website i wonder if i could config it to limit concurrent connection ?
<bean id="checkingAccountService"
class="org.springframework.jms.remoting.JmsInvokerServiceExporter">
<property name="serviceInterface" value="com.foo.CheckingAccountService"/>
<property name="service">
<bean class="com.foo.SimpleCheckingAccountService"/>
</property>
</bean>
thx for your reply

service properties in CAS client

I wanted to connect one of my web apps with CAS server. I successfully created my CAS server also with SSL setting. but there is an ambiguity when I wanted to set up my CAS client.
In spring web site there is a bean like this which they say we should initialize and create it.
<bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties">
<property name="service" value="https://localhost:8443/cas-sample/j_spring_cas_security_check" />
<property name="sendRenew" value="false" />
</bean>
The problem here I can't understand what is "service" and what URL it is referred to? I mean in my web app, what the value of "service" should be?

From the Spring Security 3 book:
The service property indicates to CAS the service to which the user will be
authenticated.
For example: https://localhost:8443/your-web-application/j_spring_cas_security_check

Spring, CXF: Loose coupling between web service client and server

I have two webapps: a web-service client and a server (both CXF-based, using the Simple Front-End approach).
This is the server definition:
<simple:server id="server" bindingId="http://schemas.xmlsoap.org/soap/"
address="/thingy" transportId="http://schemas.xmlsoap.org/soap/"
serviceName="cs:thingyService"
serviceClass="com.mycompany.thingy.api.service.ThingyService"
endpointName="cs:thingyServicePort">
<simple:serviceBean>
<bean class="com.mycompany.thingy.server.service.ThingyServiceDelegate">
<property name="thingyService" ref="thingyService"></property>
</bean>
</simple:serviceBean>
<simple:dataBinding>
<bean class="org.apache.cxf.aegis.databinding.AegisDatabinding" />
</simple:dataBinding>
<simple:binding>
<soap:soapBinding version="1.1" mtomEnabled="true" />
</simple:binding>
</simple:server>
And here the client:
<http-conf:conduit name="*.http-conduit">
<http-conf:client AllowChunking="false" />
</http-conf:conduit>
<simple:client id="thingyService" wsdlLocation="${wsdl.url}?wsdl"
serviceName="cs:thingyService"
endpointName="cs:thingyServicePort"
transportId="http://schemas.xmlsoap.org/soap/"
address="${wsdl.url}"
bindingId="http://schemas.xmlsoap.org/soap/"
serviceClass="com.mycompany.thingy.api.service.ThingyService">
<simple:dataBinding>
<bean class="org.apache.cxf.aegis.databinding.AegisDatabinding" />
</simple:dataBinding>
<simple:binding>
<soap:soapBinding mtomEnabled="true" version="1.1" />
</simple:binding>
</simple:client>
I have an interface called ThingyService (the names have been changed ...) that is known to both client and server and the above client definition creates a proxy client that can be injected using this interface.
Everything works beautifully when both webapps are running, specifically when I deploy the server first and then the client. But when the server webapps does not start correctly, the client webapp hangs in an infinite loop trying to create the proxy from the non-existent WSDL.
Basically what I'd like is a proxy around the service proxy that lets the calls pass through when the service is available and throws an adequate exception when the service is down, which I can catch and show a "sorry, we're offline" page in the gui and resumes service when the web service is available again. I have access to the WSDL in static form through the build process (generated automatically through cxf maven plugins), so I could use this for the initial configuration, so from that point of view I am independent of the server.
Does anybody have any pointers in how to implement this functionality? The server is tomcat. The webapps may or may not be deployed onto the same server during production. The backend uses spring / jpa / cxf, the front end uses spring / wicket.

Instead of generating a proxy at runtime, it sounds like you want to create the web service proxy / client code offline.
I'm not sure how this is handled with CXF but you can use tools like wsdl2java to generate the web service client code for a given wsdl document.
As an alternative approach, the client bean could be pointed at a static wsdl file, rather than one located on a remote server.

Although the static wsdl creation approach was promising, I chose a different one (mainly because the cxf maven code generation is buggy).
I wrapped another factoryBean around the existing one, and I attached it to a service provider object that regularly pings the wsdl URL for availability. I keep a service proxy in a cache inside the factory bean, once it is created, and delete it as soon as the service provider ping fails.
If the service is currently not available, my FactoryBean throws a ServiceNotAvailableException. My front end catches this and shows a nice "Service currently unavailable" page.
Additionally, an AspectJ aspect catches all writing calls to the service and re-schedules them when the service is available again.
Here is an excerpt from my spring config:
<bean id="outerFactoryBean">
<property name="innerFactory">
<bean class="org.apache.cxf.frontend.ClientProxyFactoryBean">
<!-- translation of spring:client definition from question -->
</bean>
</property>
<property name="serviceProvider" ref="serviceProvider" />
</bean>
<bean id="serviceProvider" class="de.mytoys.shop.coupons.web.client.ServiceProvider">
<property name="wsdlUrl" value="${wsdl.url}?wsdl" />
<property name="connectionFactory">
<bean class="org.apache.cxf.transport.http.HttpURLConnectionFactoryImpl" />
</property>
</bean>
<task:scheduled-tasks>
<task:scheduled ref="serviceProvider" method="checkAvailability"
fixed-delay="1000" />
</task:scheduled-tasks>
<task:scheduler id="scheduler" pool-size="1" />