fvaleri commented on code in PR #57:
URL: 
https://github.com/apache/camel-spring-boot-examples/pull/57#discussion_r868854598


##########
spring-boot-jta-jpa/src/main/java/sample/camel/CamelRoutes.java:
##########
@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sample.camel;
+
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.model.rest.RestParamType;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CamelRoutes extends RouteBuilder {
+    @Value("${camel.servlet.mapping.context-path}")
+    public String contextPath;
+
+    @Override
+    public void configure() {
+        restConfiguration()
+            .contextPath(contextPath.substring(0, contextPath.length() - 2));
+
+        rest("/messages")
+            .produces("text/plain")
+            .get()
+                .to("direct:messages")
+            .post("/{message}")
+                
.param().name("message").type(RestParamType.path).dataType("string").endParam()
+                .to("direct:trans");
+
+        from("direct:messages")
+            .to("jpa:it.fvaleri.integ.AuditLog?namedQuery=getAuditLog")
+            .convertBodyTo(String.class);
+
+        from("direct:trans")
+            .transacted()
+            .setBody(simple("${headers.message}"))
+            .to("bean:auditLog?method=createAuditLog(${body})")
+            .to("jpa:it.fvaleri.integ.AuditLog")

Review Comment:
   Yep.



##########
spring-boot-jta-jpa/src/main/resources/spring-camel.xml:
##########
@@ -0,0 +1,113 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You under the Apache License, Version 2.0
+    (the "License"); you may not use this file except in compliance with
+    the License.  You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+<beans xmlns="http://www.springframework.org/schema/beans"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+       xsi:schemaLocation="http://www.springframework.org/schema/beans 
https://www.springframework.org/schema/beans/spring-beans.xsd";>
+    <bean id="auditLog" class="sample.camel.AuditLog"/>
+    <bean id="transactionManagerImple"
+          
class="com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionManagerImple"/>
+    <bean id="userTransactionImple" 
class="com.arjuna.ats.internal.jta.transaction.arjunacore.UserTransactionImple"/>
+    <bean id="recoveryManagerFactory" class="sample.camel.RMFactory"/>
+    <bean id="recoveryManager" factory-bean="recoveryManagerFactory" 
factory-method="createInstance"/>
+    <bean id="jtaTransactionManager" 
class="org.springframework.transaction.jta.JtaTransactionManager">
+        <property name="transactionManager" ref="transactionManagerImple"/>
+        <property name="userTransaction" ref="userTransactionImple"/>
+    </bean>
+    <bean id="PROPAGATION_REQUIRED" 
class="org.apache.camel.spring.spi.SpringTransactionPolicy">
+        <property name="transactionManager" ref="jtaTransactionManager"/>
+        <property name="propagationBehaviorName" value="PROPAGATION_REQUIRED"/>
+    </bean>
+
+    <bean id="jtaDataSource" class="com.mysql.cj.jdbc.MysqlXADataSource">
+        <property name="url" value="jdbc:mysql://localhost:3306/testdb"/>
+        <property name="user" value="admin"/>
+        <property name="password" value="admin"/>
+    </bean>
+
+    <!-- Pooled JTA aware data source -->
+    <bean id="pooledJtaDataSource" 
class="org.apache.commons.dbcp2.managed.BasicManagedDataSource">
+        <property name="transactionManager" ref="transactionManagerImple"/>
+        <property name="xaDataSourceInstance" ref="jtaDataSource"/>
+        <property name="initialSize" value="5"/>
+        <property name="maxIdle" value="5"/>
+    </bean>
+
+    <bean id="entityManagerFactory" 
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
+        <property name="packagesToScan" value="sample.camel"/>
+        <property name="jtaDataSource" ref="pooledJtaDataSource"/>
+        <property name="persistenceUnitName" value="camel"/>
+        <property name="jpaDialect">
+            <bean 
class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
+        </property>
+        <property name="jpaVendorAdapter">
+            <bean 
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
+                <property name="databasePlatform" 
value="org.hibernate.dialect.MySQLDialect"/>
+            </bean>
+        </property>
+        <property name="jpaProperties">
+            <props>
+                <prop key="hibernate.hbm2ddl.auto">none</prop>
+                <prop key="hibernate.id.new_generator_mappings">false</prop>
+                <prop key="hibernate.transaction.coordinator_class">jta</prop>
+                <prop key="hibernate.transaction.jta.platform">
+                    
org.hibernate.engine.transaction.jta.platform.internal.JBossStandAloneJtaPlatform
+                </prop>
+                <prop key="hibernate.show_sql">false</prop>
+                <prop key="hibernate.format_sql">true"</prop>
+            </props>
+        </property>
+    </bean>
+
+    <bean id="jpa" class="org.apache.camel.component.jpa.JpaComponent">
+        <property name="transactionManager" ref="jtaTransactionManager"/>
+        <property name="entityManagerFactory" ref="entityManagerFactory"/>
+        <property name="joinTransaction" value="true"/>
+        <property name="sharedEntityManager" value="false"/>
+    </bean>
+
+    <bean id="jtaConnectionFactory" 
class="org.apache.activemq.artemis.jms.client.ActiveMQXAConnectionFactory">
+        <constructor-arg value="tcp://localhost:61616"/>
+        <constructor-arg value="admin"/>
+        <constructor-arg value="admin"/>
+    </bean>
+
+    <!-- Pooled JTA aware connection factory -->
+    <bean id="pooledJtaConnectionFactory" 
class="org.messaginghub.pooled.jms.JmsPoolXAConnectionFactory">
+        <property name="transactionManager" ref="transactionManagerImple"/>
+        <property name="connectionFactory" ref="jtaConnectionFactory"/>
+        <property name="maxConnections" value="1"/>
+        <property name="maxSessionsPerConnection" value="100"/>
+        <property name="useAnonymousProducers" value="false"/>
+    </bean>
+
+    <bean id="jms" class="org.apache.camel.component.jms.JmsComponent">
+        <property name="configuration">
+            <bean class="org.apache.camel.component.jms.JmsConfiguration">
+                <property name="transactionManager" 
ref="jtaTransactionManager"/>
+                <property name="connectionFactory" 
ref="pooledJtaConnectionFactory"/>
+                <!-- disable local transactions as JTA TM will take care of 
enrolling -->
+                <property name="transacted" value="false"/>
+                <!-- caching does not work with distributed transactions -->
+                <property name="cacheLevelName" value="CACHE_NONE"/>
+                <property name="maxConcurrentConsumers" value="1"/>
+                <property name="testConnectionOnStartup" value="true"/>
+            </bean>
+        </property>
+    </bean>
+</beans>

Review Comment:
   Agreed. One of the objective of this example was to make that complexity 
explicit. It is even more complicated if you look at beans graph resulting from 
Narayana SB auto-configuration. There additional wrapper and proxy classes.



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