AMQ-2960: Fixed potential NPE in pooled connection factory in activemq-spring when using spring-dm in OSGi. As spring-dm may call getObject before postCostruct has been called.

activemq-spring/src/main/java/org/apache/activemq/pool/PooledConnectionFactoryBean.java

@@ -185,9 +185,12 @@ public class PooledConnectionFactoryBean implements FactoryBean {
         }
     }
 
-    // FactoryBean methods
     @Override
     public Object getObject() throws Exception {
+        // in case spring-dm calls getObject before this bean has been initialized
+        if (pooledConnectionFactory == null) {
+            afterPropertiesSet();
+        }
         return pooledConnectionFactory;
     }