Fixes a deployment but in Activiti 3.3-3.6 whereby the deployer looks at the 'oldest' instead of the 'latest' deployment and compares the bar 'to be deployed'.

RailincDeploymentManager.java

package com.railinc.activiti.sso;

import java.util.List;

import org.activiti.engine.impl.persistence.entity.DeploymentEntity;
import org.activiti.engine.repository.Deployment;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RailincDeploymentManager extends
		org.activiti.engine.impl.persistence.entity.DeploymentManager {

	private final Logger log = LoggerFactory.getLogger(RailincDeploymentManager.class);
	
	/**
	 * fix a bug with the standard DeploymentManager. It sorts the deployments ascending and
	 * pulls the first deployment. it should sort descending.
	 */
	@Override
	public DeploymentEntity findLatestDeploymentByName(String deploymentName) {
		
		List<Deployment> list = getDbSqlSession().createDeploymentQuery().deploymentName(deploymentName).orderByDeploymenTime().desc().listPage(0, 1);
		
	    DeploymentEntity deployment = null;
	    
	    if (list!=null && !list.isEmpty()) {
	    	deployment = (DeploymentEntity) list.get(0);
	    }
	    if (log.isInfoEnabled()) {
	    	if (deployment == null) {
	    		log.info("Returning null from findLatestDeploymentByName");
	    	} else {
	    		log.info(String.format("Returning (%s,%s,%s) from findLatestDeploymentByName",
	    				deployment.getId(),
	    				deployment.getName(),
	    				String.valueOf(deployment.getDeploymentTime())));
	    	}
	    }

	    return deployment;
	}

}

RailincDeploymentManagerFactory.java

package com.railinc.activiti.sso;

import org.activiti.engine.impl.interceptor.Session;
import org.activiti.engine.impl.interceptor.SessionFactory;
import org.activiti.engine.impl.persistence.entity.DeploymentManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RailincDeploymentManagerFactory implements SessionFactory {
	
	private final Logger log = LoggerFactory.getLogger(RailincDeploymentManagerFactory.class);
	
	@Override
	public Class<?> getSessionType() {
		return DeploymentManager.class;
	}

	@Override
	public Session openSession() {
		if (log.isDebugEnabled()) {
			log.debug("Returning new RailincDeploymentManager from openSession()");
		}
		return new RailincDeploymentManager();
	}

	
}

spring-activiti.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:p="http://www.springframework.org/schema/p"
		xmlns:tx="http://www.springframework.org/schema/tx"
		xmlns:util="http://www.springframework.org/schema/util"
		xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
                http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">

	<bean id="ssoProxy" class="com.railinc.loa.core.service.SSOProxy"/>

	<bean id="repositoryService" factory-bean="processEngine"
	    factory-method="getRepositoryService" />
	<bean id="runtimeService" factory-bean="processEngine"
	    factory-method="getRuntimeService" />
	<bean id="taskService" factory-bean="processEngine"
	    factory-method="getTaskService" />
	<bean id="historyService" factory-bean="processEngine"
	    factory-method="getHistoryService" />
	<bean id="managementService" factory-bean="processEngine"
	    factory-method="getManagementService" />
	<bean id="identityService" factory-bean="processEngine"
	    factory-method="getIdentityService" />
	<bean id="formService" factory-bean="processEngine"
	    factory-method="getFormService" />

	<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
	    <property name="dataSource" ref="dataSource" />
	    <property name="transactionManager" ref="transactionManager" />
	    <property name="databaseSchemaUpdate" value="true" />
	    <property name="jobExecutorActivate" value="true" />
	    <property name="deploymentResources"
		   value="classpath:activiti/LOA.bpmn20.xml" />
		<property name="customSessionFactories">
	        <list>
	            <bean class="com.railinc.activiti.sso.RailincGroupManagerFactory"
	            	p:userClient-ref="userClient"
	            	p:modulesClient-ref="modulesClient"/>
	            <bean class="com.railinc.activiti.sso.RailincUserManagerFactory"
	            	p:userClient-ref="userClient"/>
 				<bean class="com.railinc.activiti.sso.RailincDeploymentManagerFactory" />	            	
	        </list>
    	</property>		    
	</bean>
	
	<bean id="userClient" class="com.railinc.sso.services.impl.UserClientImpl"
		p:ssoServiesHost="${ssoServicesHost}"/>
	
	<bean id="modulesClient" class="com.railinc.sso.services.impl.ModulesClientImpl"
		p:ssoServiesHost="${ssoServicesHost}"/>
	
	 
	<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean"
		p:processEngineConfiguration-ref="processEngineConfiguration" />	
</beans>