I am looking for some guidance on deploying a simple Spring Integration application to WebSphere. The overall scope of the application is quite simple - it reads from a RabbitMQ endpoint, transforms any messages received to a specific xml format, and then posts the message to a JMS endpoint in WAS.
Initially, I built the application as a JAR. I was able to get it to work well enough with SSL turned off on the IIOP endpoints in WAS, but despite hours of debugging I never could get it to communicate properly with WAS over SSL. The initial handshake and communication with the bootstrap port was successful, but the SIB endpoint rejected the exact same certificate chain with the usual PKIX chaining error, and no amount of certificate importing made any difference.
So I elected to work out deploying the application as a web app into WAS itself, which would have been the end goal anyways. This caused a number of issues that i've had to work through:
I have not gotten properties to work in the normal Spring fashion. I assume that in this context Spring needs to be explicitly told where to look, but i've sidestepped this with hardcoding for now. Perhaps using #Resource annotations would be the way to do this in this context?
Various jar versioning issues, which i've mostly worked out by setting the application classloader as PARENT_LAST, and judiciously removing things that seemed redundant.
Oddly I did have to add some jars related to Parameter validation which don't seem to have been present in my original maven build.
Needing to set some values in the web.xml in order for spring to location configuration beans, specifically setting init-param with contextClass (org.springframework.web.context.support.AnnotationConfigWebApplicationContext) and contextConfigLocation set to a list of the objects that would normally be loaded via the #Configuration annotation.
May or may not be necessary but I did move from Maven to IID in order to hopefully avoid versioning issues with IBM related jars.
Now I would like to know if there are other items generally needed to be done to deploy Spring (especially Spring Integration) to WAS, and whether the above seems like enough.
In addition, I have an issue with the actual JMS connection to WAS. I have tried to use the UserCredentialsConnectionFactoryAdapter, and was successful with this with Spring standalone. However when deployed in WAS, an exception is thrown:
Caused by: java.lang.ClassCastException: com.ibm.ws.sib.api.jms.impl.JmsManagedQueueConnectionFactoryImpl incompatible with javax.jms.ConnectionFactory
I believe this is thrown when the setTargetConnectionFactory method is called, since if I use the connection factory without the UserCredentialsConnectionFactoryAdapter, it works fine, except the connection by "anonymous" is rejected by the bus:
[03/03/21 15:23:32:934 EST] 0000016c SibMessage W [BPM.WorkflowServer.Bus:Node1.server1-BPM.WorkflowServer.Bus] CWSII0212W: The bus BPM.WorkflowServer.Bus denied an anonymous user access to the bus.
If you want to see the code, this works fine (but doesn't authenticate):
#Bean
public ConnectionFactory jmsConnectionFactory() throws NamingException {
ConnectionFactory connectionFactory = null;
Context ctx = null;
Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory");
p.put(Context.PROVIDER_URL, providerUrl);
p.put(Context.SECURITY_AUTHENTICATION,"simple");
p.put(Context.SECURITY_PRINCIPAL,jmsUsername);
p.put(Context.SECURITY_CREDENTIALS,jmsPassword);
ctx = new InitialContext(p);
if (null != ctx)
System.out.println("Got naming context");
connectionFactory = (QueueConnectionFactory) ctx.lookup("javax.jms.QueueConnectionFactory");
if (null != connectionFactory)
System.out.println("Got connection factory");
return connectionFactory;
}
Whereas this throws the class cast exception:
#Bean
public UserCredentialsConnectionFactoryAdapter jmsConnectionFactory() throws NamingException {
ConnectionFactory connectionFactory = null;
Context ctx = null;
Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory");
p.put(Context.PROVIDER_URL, providerUrl);
p.put(Context.SECURITY_AUTHENTICATION,"simple");
p.put(Context.SECURITY_PRINCIPAL,jmsUsername);
p.put(Context.SECURITY_CREDENTIALS,jmsPassword);
ctx = new InitialContext(p);
if (null != ctx)
System.out.println("Got naming context");
connectionFactory = (ConnectionFactory) ctx.lookup("javax.jms.QueueConnectionFactory");
if (null != connectionFactory)
System.out.println("Got connection factory");
UserCredentialsConnectionFactoryAdapter adapter = new UserCredentialsConnectionFactoryAdapter();
adapter.setTargetConnectionFactory(connectionFactory);
adapter.setUsername(jmsUsername);
adapter.setPassword(jmsPassword);
return adapter;
// return connectionFactory;
}
Note: the credentials set in the Context properties seem to have no effect.
I am using this connection factory with Spring Integration Java DSL:
.handle(Jms.outboundAdapter(jmsConfig.jmsConnectionFactory())
.destination(jmsDestination))
I understand from WebSphere documentation that supplying credentials happens on the ConnectionFactory.getConnection() call. So I wonder whether there is any hook in the DSL where I could override the getConnection so as to provide parameters and avoid the class cast exception that I am seeing.
Alternately I am considering just explicitly calling jms template methods to send the message using a lambda in the handler and creating the connection manually.
So, finally what I would like to ask for is:
Any overall guidance on deploying a Spring application to WebSphere traditional
What may be causing the class cast exception
ps, I have placed all of the spring, et al jars in a shared library. This is the contents:
c:/IBM/IID/sharedlibs/spring/accessors-smart-1.2.jar
c:/IBM/IID/sharedlibs/spring/amqp-client-5.10.0.jar
c:/IBM/IID/sharedlibs/spring/android-json-0.0.20131108.vaadin1.jar
c:/IBM/IID/sharedlibs/spring/apiguardian-api-1.1.0.jar
c:/IBM/IID/sharedlibs/spring/asm-5.0.4.jar
c:/IBM/IID/sharedlibs/spring/assertj-core-3.18.1.jar
c:/IBM/IID/sharedlibs/spring/byte-buddy-1.10.19.jar
c:/IBM/IID/sharedlibs/spring/byte-buddy-agent-1.10.19.jar
c:/IBM/IID/sharedlibs/spring/hamcrest-2.2.jar
c:/IBM/IID/sharedlibs/spring/hamcrest-core-2.2.jar
c:/IBM/IID/sharedlibs/spring/hamcrest-library-2.2.jar
c:/IBM/IID/sharedlibs/spring/http-client-3.8.0.RELEASE.jar
c:/IBM/IID/sharedlibs/spring/jackson-annotations-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-core-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-databind-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-dataformat-xml-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-datatype-jdk8-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-datatype-jsr310-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-module-jaxb-annotations-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jackson-module-parameter-names-2.11.4.jar
c:/IBM/IID/sharedlibs/spring/jakarta.activation-api-1.2.2.jar
c:/IBM/IID/sharedlibs/spring/jakarta.annotation-api-1.3.5.jar
c:/IBM/IID/sharedlibs/spring/jakarta.el-3.0.3.jar
c:/IBM/IID/sharedlibs/spring/json-path-2.4.0.jar
c:/IBM/IID/sharedlibs/spring/json-smart-2.3.jar
c:/IBM/IID/sharedlibs/spring/jsonassert-1.5.0.jar
c:/IBM/IID/sharedlibs/spring/objenesis-3.1.jar
c:/IBM/IID/sharedlibs/spring/reactive-streams-1.0.3.jar
c:/IBM/IID/sharedlibs/spring/reactor-core-3.4.2.jar
c:/IBM/IID/sharedlibs/spring/snakeyaml-1.27.jar
c:/IBM/IID/sharedlibs/spring/spring-amqp-2.3.4.jar
c:/IBM/IID/sharedlibs/spring/spring-aop-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-beans-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-autoconfigure-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-starter-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-starter-amqp-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-starter-json-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-starter-logging-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-boot-starter-web-2.4.2.jar
c:/IBM/IID/sharedlibs/spring/spring-context-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-core-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-expression-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-integration-amqp-5.4.3.jar
c:/IBM/IID/sharedlibs/spring/spring-integration-core-5.4.3.jar
c:/IBM/IID/sharedlibs/spring/spring-integration-jms-5.4.3.jar
c:/IBM/IID/sharedlibs/spring/spring-integration-xml-5.4.3.jar
c:/IBM/IID/sharedlibs/spring/spring-jcl-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-jms-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-messaging-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-oxm-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-rabbit-2.3.4.jar
c:/IBM/IID/sharedlibs/spring/spring-rabbit-junit-2.3.4.jar
c:/IBM/IID/sharedlibs/spring/spring-retry-1.3.1.jar
c:/IBM/IID/sharedlibs/spring/spring-tx-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-web-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-webmvc-5.3.3.jar
c:/IBM/IID/sharedlibs/spring/spring-xml-3.0.10.RELEASE.jar
c:/IBM/IID/sharedlibs/spring/stax2-api-4.2.1.jar
c:/IBM/IID/sharedlibs/spring/woodstox-core-6.2.4.jar
c:/IBM/IID/sharedlibs/spring/xmlunit-core-2.7.0.jar
c:/IBM/IID/sharedlibs/spring/slf4j-api-1.7.30.jar
c:/IBM/IID/sharedlibs/spring/jakarta.validation-api-2.0.2.jar
c:/IBM/IID/sharedlibs/spring/hibernate-validator-6.1.7.Final.jar
c:/IBM/IID/sharedlibs/spring/jboss-logging-3.4.1.Final.jar
c:/IBM/IID/sharedlibs/spring/classmate-1.5.1.jar
c:/IBM/IID/sharedlibs/spring/javax.jms-api-2.0.1.jar
UPDATE
So what I finally realized is that:
WAS 8.5.5 is using J2EE v6, which means JMS 1.1
Spring JMS is using JMS 2.0
When I switched to using the UserCredentialsConnectionFactoryAdapter, this tries to use the JmsContext interface which is part of JMS 2.0 classes, and not provided by the WAS jee container, so this was the reason for the class cast exception.
What I did was to do the JMS sending manually instead of using any spring integration gateway. A better solution might be to create my own adapter that extends connection factory and uses credentials in the connect method, but this works well enough for now:
.handle( m -> {
try {
jmsConfig.sendMessage( m.getPayload().toString() );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} )
JmsConfig being a bean that manages the connection.
Related
On an application I am working I am trying to upgrade from Hazelcast 3.6 to 3.12.4 and I am encountering some problems which reproduce easily when two or more tests are ran together. The tests are all annotated with #WebAppConfiguration and include the Spring's application configuration using ContextConfiguration(classes = {AppConfig.class})
As part of the configuration, I have a #Bean that called CacheAwareStorage that initiates the CacheManager. THe initialization is quite basic:
public Cache<T, V> initCache(String name, Class<T> type, Class<T> valueType) {
Cache<T, V> cache = manager.getCache(cacheName, keyType, valueType);
if (cache != null)
{
return cache;
}
cache = manager.createCache(cacheName, config);
return cache;
}
The problem occurs when the context is refreshed as part of the test suit, which I think is done in AbstractTestNGSpringContextTests since I don't explicitly refresh the context. The following error occurs which result sin only the first class of tests to pass:
GenericWebApplicationContext: Refreshing org.springframework.web.context.support.GenericWebApplicationContext#6170989a
....
WARN GenericWebApplicationContext: Exception encountered during context initialization - cancelling refresh attempt
....
Factory method 'tokenStore' threw exception
nested exception is java.lang.IllegalStateException: Cannot overwrite a Cache's CacheManager.
Looking over what has changed, I see that the AbstracthazelcastCacheManager throws an IllegalStateException which comes from the Hazelcast CacheProxy. To be more precise, the manager.getCache() -> getCacheUnchecked() -> creates a cache proxy in createCacheProxy() -> and set's the proxy's manager to the current manager in cacheProxy.setCacheManager().
Starting with Hazelcast v3.9, this is no longer allowed once the manager has already been set.
What would be a solution for this? It may be that there is a bug in Hazelcast (there is no check if the manager that is being set is actually different than the already existing one), however I am looking for something that I can do on my side. Why the 'getCache()' tries to re-create the proxy is another thing that I do not understand.
I assume that I must do something so that the Context is not refreshed, however I don't know how (if at all) I can do that.
The problem was due to the way the Cache manager Bean was created. I used the internal Hazelcast cache manager and a new instance was created each time. Using the JCache API as bellow, solved the problem
#Bean
public CacheManager cacheManager() {
HazelcastServerCachingProvider provider = Caching.getCachingProvider(); // or add class name of Hazelcast server caching provider to disambiguate
return provider.getCacheManager(null, null, HazelcastCachingProvider.propertiesByInstanceItself(HAZELCAST_INSTANCE));
}
Help received from Hazelcast team on this: https://github.com/hazelcast/hazelcast/issues/16212
I have a Spring JMS application that has a JMS Listener that connects to an Active MQ queue on application startup. This JMS listener is a part of the an application that takes a message, enriches it with content, and then delivers it to a topic on the same ActiveMQ broker.
The sessionTransacted is set to True. I'm not performing any database transactions, so I do not have #Transactional set anywhere. From what I've read, the sessionTransacted property sets a local transaction around the JMS Listener's receive method and therefore it will not pull the message off the queue until the transaction is complete. I've tested this using a local ActiveMQ instance, and on my local tomcat container, and it worked as expected.
However, when I deploy to our PERF environment and retry the same test, I notice that the message that was currently in-flight when the server was shutdown, is pulled from queue prior to completing the receive method.
What I would like to know is if there is anything obvious that I should be looking for? Are there certain JMS headers that would cause this behaviour to occur? Please let me know if there is anymore information that I can provide.
I'm using Spring 4.1.2.RELEASE with Apache ActiveMQ 5.8.0, on a Tomcat 7 container running Java 8.
UPDATE - Adding my Java JMS Configurations. Please note that I substituted what I had in my PERF properties file into the relevant areas for clarity.
#Bean
public DefaultJmsListenerContainerFactory jmsListenerContainerFactory() throws Throwable {
DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory();
factory.setConnectionFactory(connectionFactory());
factory.setMaxMessagesPerTask(-1);
factory.setConcurrency(1);
factory.setSessionTransacted(Boolean.TRUE);
return factory;
}
#Bean
public CachingConnectionFactory connectionFactory(){
RedeliveryPolicy redeliveryPolicy = new RedeliveryPolicy();
redeliveryPolicy.setInitialRedeliveryDelay(1000);
redeliveryPolicy.setRedeliveryDelay(1000);
redeliveryPolicy.setMaximumRedeliveries(6);
redeliveryPolicy.setUseExponentialBackOff(Boolean.TRUE);
redeliveryPolicy.setBackOffMultiplier(5);
ActiveMQConnectionFactory activeMQ = new ActiveMQConnectionFactory(environment.getProperty("queue.username"), environment.getProperty("queue.password"), environment.getProperty("jms.broker.endpoint"));
activeMQ.setRedeliveryPolicy(redeliveryPolicy);
activeMQ.setPrefetchPolicy(prefetchPolicy());
CachingConnectionFactory cachingConnectionFactory = new CachingConnectionFactory(activeMQ);
cachingConnectionFactory.setCacheConsumers(Boolean.FALSE);
cachingConnectionFactory.setSessionCacheSize(1);
return cachingConnectionFactory;
}
#Bean
public JmsMessagingTemplate jmsMessagingTemplate(){
ActiveMQTopic activeMQ = new ActiveMQTopic(environment.getProperty("queue.out"));
JmsMessagingTemplate jmsMessagingTemplate = new JmsMessagingTemplate(connectionFactory());
jmsMessagingTemplate.setDefaultDestination(activeMQ);
return jmsMessagingTemplate;
}
protected ActiveMQPrefetchPolicy prefetchPolicy(){
ActiveMQPrefetchPolicy prefetchPolicy = new ActiveMQPrefetchPolicy();
int prefetchValue = 0;
prefetchPolicy.setQueuePrefetch(prefetchValue);
return prefetchPolicy;
}
Thanks,
Juan
It turns out that there were different versions of our application deployed on our PERF environment. Once the application was updated, then it worked as expected.
We have an app that is using hibernate, spring, and DB2 in websphere 7. We have audit triggers and we need to set so the triggers can know the logged in user (we use generic logon to the database). We came up with a new scheme for setting this in a new app so that it can automatically join in new transactions. We overrode the transaction manager and did the work in the doBegin.
These scheme worked great in one app, and seemed to work great in a second app, but now, weeks later, and not consistently (behavior is intermittent and does not happen in local development), we are getting this Pre-bound JDBC Connection found error. Looking online most posts say this is when you use two transaction managers against one data source. That is now what we are doing.
I also read one post wondering if it was because he mixed annotation and AOP based transactions. This app does some of that. I don't really buy that theory, but thought I'd mention it.
Exception:
Caused by:
org.springframework.transaction.IllegalTransactionStateException: Pre-bound JDBC Connection found! HibernateTransactionManager does not support running within DataSourceTransactionManager if told to manage the DataSource itself. It is recommended to use a single HibernateTransactionManager for all transactions on a single DataSource, no matter whether Hibernate or JDBC access.
at java.lang.Throwable.<init>(Throwable.java:67)
at org.springframework.core.NestedRuntimeException.<init>(NestedRuntimeException.java:54)
at org.springframework.transaction.TransactionException.<init>(TransactionException.java:34)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:475)
at gov.usdoj.afms.umc.utils.hibernate.AfmsHibernateTransactionManager.doBegin(AfmsHibernateTransactionManager.java:28)
Code (note that the exception comes from the super.doBegin()):
protected void doBegin(Object arg0, TransactionDefinition arg1) {
super.doBegin(arg0, arg1);
if (!Db2ClientInfo.exists()) {
clearDBProperty();
} else {
setDBProperty(Db2ClientInfo.getClientUserId(), Db2ClientInfo.getClientApplicationId());
}
}
private void setDBProperty(String uId, String appName) {
Session session = getSessionFactory().getCurrentSession();
Properties props = new Properties();
props.setProperty(WSConnection.CLIENT_ID, uId);
props.setProperty(WSConnection.CLIENT_APPLICATION_NAME, appName);
try {
Connection nativeConn = new SimpleNativeJdbcExtractor().getNativeConnection(session.connection());
if (nativeConn instanceof WSConnection) {
WSConnection wconn = (WSConnection) nativeConn;
wconn.setClientInformation(props);
} else {
logger.error("Connection was NOT an instance of WSConnection so client ID and app could not be set");
}
} catch (Exception e) {
throw new RuntimeException("Cannot set DB parameters!", e);
}
}
I just realized I never answered this. It turns out that the exception had nothing whatever to do with our Tx manager. It was the fact that this particular EAR has two apps in it, each pointing to the same data source. Evidently this confuses hibernate. We've plans to separate the apps some day, but creating an identical (except in name) data source and pointing the apps at them separately fixes the issue for now.
Instead of modifying the transaction manager it might be easier (better?) to create a wrapper around your datasource (extending DelegatingDataSource from spring) and override the 2 getConnection methods. For the cleanup you could wrap the connection in a proxy and intercept the close method.
That should be a safer (and easier I guess) way then trying to fiddle with the transaction manager and it works for every technology (JDBC, Hibernate, JPA etc.) as long as you use the wrapped datasource. (The registration could be done with a BeanPostProcessor which detects DataSource instances and simply wraps them in the delegate).
If that is to radical (as it means changing your current applications instead of updating a library). It could be a configuration problem, make sure that you are only loading your configuration (and thus DataSource and TransactionManager) only once, duplicating bean instances might lead to a similair behavior.
For posterity, I just got this problem and the answers here weren't very helpful. We resolved the problem by removing a double import of a core XML file which had the AOP transaction manager definition in it:
<tx:annotation-driven transaction-manager="..."
proxy-target-class="true" />
I'm thinking that it causes there to be 2 transaction managers overlapping the same namespace. To fix it, we moved the imports around so they were being done once.
Hope this helps someone else.
I have an app that uses CXF as a SOAP client and Jersey to present REST services, with the Jersey classes managed by Spring. This works fine running in Tomcat; however when attempting to test with JerseyTest I get Spring conflicts; it appears JerseyTest doesn't shut-down the Spring context correctly.
The test initialisation for Jersey looks like:
public MailProviderTest()
throws Exception
{
super(new WebAppDescriptor.Builder("net.haltcondition.service.rest")
.contextPath("")
.contextParam("contextConfigLocation", "classpath:applicationContext.xml")
.servletClass(SpringServlet.class)
.contextListenerClass(ContextLoaderListener.class)
.build());
}
The CXF tests (which talk to our upstream provider's test servers) looks like:
#Before
public void setup()
{
// We need to do this the hard way to set the test endpoint rather than the default
JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean();
factory.setServiceClass(Soap.class);
factory.setAddress("https://webservice.test.provider.com/Service.asmx");
soap = (Soap) factory.create();
Map<String,Object> outProps= new HashMap<String,Object>();
outProps.put(WSHandlerConstants.ACTION, WSHandlerConstants.USERNAME_TOKEN);
outProps.put(WSHandlerConstants.USER, "TESTUSER");
outProps.put(WSHandlerConstants.PASSWORD_TYPE, WSConstants.PW_TEXT);
outProps.put(WSHandlerConstants.PW_CALLBACK_REF, new WSAuthHandler("XXXX"));
Client cxfClient = ClientProxy.getClient(soap);
Endpoint cxfEndpoint = cxfClient.getEndpoint();
cxfEndpoint.getOutInterceptors().add(new WSS4JOutInterceptor(outProps));
}
When Maven runs the tests the Jersey class is run first; this results in the following error when running the CXF tests:
Caused by: java.lang.IllegalStateException: BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext
at org.springframework.context.support.AbstractRefreshableApplicationContext.getBeanFactory(AbstractRefreshableApplicationContext.java:153)
at org.springframework.context.support.AbstractApplicationContext.containsBean(AbstractApplicationContext.java:892)
at org.apache.cxf.configuration.spring.ConfigurerImpl.configureBean(ConfigurerImpl.java:143)
at org.apache.cxf.configuration.spring.ConfigurerImpl.configureBean(ConfigurerImpl.java:113)
at org.apache.cxf.transport.http.AbstractHTTPTransportFactory.configure(AbstractHTTPTransportFactory.java:228)
Unfortunately there doesn't seem to be any way to force the shutdown of the Spring application-context at the end of the Jersey tests and forcing per-test forks hasn't helped. It looks like I need to reset the Spring application-context as part of setting-up the CXF test, but I can't see how I would do this. Any pointers would be appreciated.
I have spent the last few days attempting to integrate a Grails (version 1.3.2) application with an EJB 2.1 application that is deployed on WebSphere 6.1. Once our grails apps are in production, they will be deployed to WebSphere as well. The EJB 2.1 application is widely used across our company and, in anything except a local development environment, is deployed to its own cluster. The way we handle this in our existing Java EE applications (all of which are non-Spring, non-Grails) is to bind a CORBA CosNaming Naming Context within each of our other clusters that can then be used to obtain references to our shared EJB 2.1 application. So, up to this point, if one of our application needed to interact with this application, they would do so using an approach like this:
String cosNameBinding = "ejbApp.HighAvail.cluster";
InitialContext initial = new InitialContext();
Context fedContext = (javax.naming.Context) initialCtx.lookup(cosNameBinding);
Then do the normal EJB-style lookup/narrow/invoke using the federated/CosNaming context:
Object ejbHomeAsObject = fedContext.lookup(jndiNameOfService);
EJBHome home = (EJBHome) PortableRemoteObject.narrow(ejbHomeAsObject, homeClass);
Object service = invokeMethod(homeClass, home, "create");
As you can see, there is a level of indirection that occurs here in order to go from the InitialContext to the federated naming Context that can be used to interact with the shared EJB application.
Running locally, I have both the Grails application and the EJB application deployed to the same server (non network deployment WAS, same profile&node). I have Spring configured like so:
beans = {
ejbJndi(org.springframework.jndi.JndiTemplate) {
environment = ["java.naming.factory.initial" :
"com.ibm.websphere.naming.WsnInitialContextFactory"]
}
crewMemberService(org.springframework.ejb.access.SimpleRemoteStatelessSessionProxyFactoryBean) {
jndiName="hotelService/ejb/HotelService"
businessInterface="com.company.appName.hotel.HotelService"
lookupHomeOnStartup="false"
cacheHome="false"
refreshHomeOnConnectFailure="true"
jndiTemplate = ref("ejbJndi")
}
}
And I can successfully inject ejb references into my Grails controllers and invoke them. However, WebSphere can only resolve the JNDI lookup because they are both deployed on the same server. When we move it to one of our development environments, we'll need jndi lookups for these services to go against the federated naming context.
So my questions are:
Is there a way to do this with the classes that are provided within Spring and if so could you give me an idea of how I would need up modify my Spring config to do so?
Given that there is no flexibility around how we deploy the other app or gain references to its services (we must use the federated context), should I consider extending JndiTemplate and do the necessary wiring myself?
If anyone has faced this situation I would be most appreciative for any insights you may be able to offer.
In case anyone has this same question down the road, I ended up implementing an extension to Spring's JndiTemplate and using that. Here is the code:
public class FederatedJndiTemplate extends org.springframework.jndi.JndiTemplate
{
protected static final String JNDI_CONTEXT_BINDING_NAME = "fed.context.jndiName";
/**
* Obtain a JNDI naming context for the specified federated naming context.
*
* #throws NamingException if no "fed.context.jndiName" has been specified in
* the environment properties for the jndiTemplate or the container throws a naming
* exception.
*/
#Override
protected Context createInitialContext() throws NamingException {
Properties props = super.getEnvironment();
if(!props.containsKey(JNDI_CONTEXT_BINDING_NAME)) {
throw new NamingException("You must specify the federated naming context JNDI binding name");
}
String jndiBinding = props.getProperty(JNDI_CONTEXT_BINDING_NAME);
InitialContext initCtx = new InitialContext();
Context fedCtx = (Context) initCtx.lookup(jndiBinding);
return fedCtx;
}
}
Then inside my resources.groovy, I just used this JndiTemplate:
ejbJndi(com.myCompany.spring.jndi.FederatedJndiTemplate) {
environment = [
"fed.context.jndiName":"myServices.HighAvail.Cluster"]
}
hotelService(org.springframework.ejb.access.SimpleRemoteStatelessSessionProxyFactoryBean) {
jndiName="hotelService/ejb/HotelService"
businessInterface="com.mycompany.appName.hotel.HotelService"
homeInterface="com.mycompany.appName.hotel.HotelServiceHome"
lookupHomeOnStartup="false"
jndiTemplate = ref("ejbJndi")
}