Case Study: Migrating Hyperic from EJB to Spring from JBoss to Apache Tomcat

Chicago, October 19 - 22, 2010
SpringOne 2GX 2010. All rights reserved. Do not distribute without permission.
Case Study: Migrating
Hyperic from EJB to
Spring! !
Jennifer Hickey
SpringSource

SpringSource Hyperic
Application and Infrastructure Management
• Discover
– Automatically find all resources
• Monitor
– Availability, performance, capacity,
history
• Track
– Logs, configuration, change management
• Alert
– Advanced condition definition, notification
& escalation schemes
• Control
– Proactive, automated actions
• Analyze
– Answer questions, plan for the future

Basic HQ Architecture
machine 1
HQ
Agent
machine n
HQ
Agent
HQ
Server HQ
Web
Portal
Inventory,
Metric,
Audit, …
items
to
manage
items
to
manage
HQ
API

Hyperic’s Server Architecture

Why Migrate?
The Obvious Answer:
5
But there’s a lot more to it....

0% 10% 20% 30% 40% 50% 60% 70%
Java Application Server Usage, Source: 2008 Evans Data Survey
Spring Applications
WebLogic 26%
JBoss 38%
WebSphere 43%
Apache Tomcat 68%
Today’s De Facto Standards
Spring and Tomcat
• Spring: Enterprise Java programming model
– Centralized configuration, declarative transactions, security,
messaging, remoting, Web MVC, Web Flow, persistence
integration, enterprise integration, batch, …
• Tomcat: Lean and powerful Web application server

How Does Lean Help?
• Installation and Provisioning
– 100X Smaller Install Footprint: Less than 50MB vs. multi-Gigabytes
• Hardware, software, lost productivity across Dev, QA, Staging, Production
• Simpler Configuration Improves Debugging and Quality
– Impact of complexity across Dev, QA, Staging, Production adds up
– “60% cite faster project completion and application quality as top reasons for
using Spring”
• Upgrade and Migration
– Lower complexity = faster migration / upgrade
• Developer Productivity
– Fast Server Startup/Shutdown
• One Developer coding/debugging an app (5 mins x 12 per day = 1 hr)
• Fluidity of Personnel
– Simpler systems = faster rampup
• License and Maintenance Costs
– tc Server is 33% to 75% savings vs. competitor annual maintenance;
additional savings when license costs are factored in

Project Timeline
M1 M2
Sept 21 Dec 24
Nov 20 Jan 15 Feb 19 Oct 15
May 28
M3 M4 M5

Planning a Migration
• Build an accurate picture of the candidate app
– Java EE APIs used
– 3rd party libraries
– Packaging
– Types and number of components
– Assess code quality (coupling, etc.)
• Analyze migration complexity
• Decide partial vs full migration
• Resource Estimation
9

Factors in Migration Complexity
Factor Effect on Complexity
Good documentation and clear
understanding of existing code,
database or requirements
Low complexity
Poor documentation and/or lack
of clear understanding of
existing code, database or
requirements
Low to medium complexity
Well architected, layered
application
Low complexity
Organically grown, non-layered
code and architecture, combined
with need to refactor

Organization already familiar
with and using Tomcat/tc Server
and/or lightweight technologies
such as Spring Framework.
Low complexity
Strong organizational support of
legacy EJB and full stack Java
EE technologies; Tomcat/tc
Server and/or lightweight
technologies such as Spring
Framework not yet adopted
Medium complexity
No integration with proprietary
application server frameworks
or APIs
Low complexity

Integration with proprietary
application server
frameworks or APIs
Low to high complexity depending
on extent of usage
No reliance on Session
EJBs, or reliance on a
straightforward use of
Session EJBs (e.g. smaller
quantity or delegating to
plain Java business objects)
server frameworks or APIs
Low to high complexity depending
on extent of usage
Heavy use of Session EJBs Medium complexity

Reliance on stateful middle tier
clustering (EJB Stateful Session
Beans)
Medium complexity
True need for distributed
transactions
Medium to high complexity
Straightforward DAO-based
database access (using either JDBC
or ORM)
Low complexity
Reliance on Entity Beans Medium to high complexity
depending on amount of
code

Servlet-spec Security usage Low complexity
Declarative EJB (Container
Managed) Security usage
Medium complexity
With Spring Security: Low-
Medium
Using existing full stack
application server's built-in JMS
provider
depending on ability to use
external commercial or open
source JMS container.
Generally only licensing (no
code changes) concern.

Project Evolution Complexity Analysis
• 80 Stateless Session Beans
• 0 Stateful Session Beans
• 3 MDBs
• 0 Entity Beans
• All Container-Managed Transactions, No XA
• JBoss Dependencies:
– JAAS
– Mail Service
– Deployment Scanner
– Schedulers
– HA
• SpringSource Migration Tool helps with analysis
15

Partial vs Full Migration
• Project worked in parallel with other releases
• Largest percentage of test coverage in system tests (vs
standalone unit and integration tests) necessitated a
partially migrated app
16

Extras
• Switch from svn to git
• Modularize monolithic codebase
• Add Java 5 constructs
• Add code conventions
• Switch from ant to maven
• Introduce Eclipse Groovy plugin
17

Resources
• Estimated 8 weeks for one person to do initial conversion
from EAR to WAR on Tomcat
• From beginning to functional complete (M5), project was
staffed with 1.5 full-time people.
• Initial conversion was done by 1.5 people in 12 weeks
18

M1 Goal
A JBoss-dependent EAR with no more Stateless Session
EJBs (all converted to POJOs and bootstrapped/
transaction-managed by Spring)
20

Preliminary Steps
• Changed ant to compile at Java 5 compliance
• Removed Xdoclet deployment descriptor and interface
generation from build
• Added “Local” interfaces to source control
• Added deployment descriptors to source control
• Added “Util” lookup classes to source control
• Introduced Eclipse projects for compiling UI plugin groovy
code
21

Dependency Injection
22
• Added temporary Bootstrap class for creation of Spring
ClasspathXmlApplicationContext
• Enabled component scanning and autowiring to
instantiate classes marked as @Service, @Repository,
and @Component
• Added @Repository to all DAOs and @Autowired to their
constructors for injection of Hibernate SessionFactory
• Added all EJBs to an app context file with factory-
method=”getOne”

Application Context Files
dao-context.xml
<beans>
<context:annotation-config />
<context:component-scan base-package="org.hyperic,com.hyperic" use-
default-filters="false">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Service"/>
</context:component-scan>
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"/>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean class="org.springframework.orm.hibernate3.HibernateTemplate">
<constructor-arg ref="sessionFactory"/>
</bean>
</beans>

Application Context Files
ejb-context.xml
<beans default-lazy-init="true">
<bean class="org.hyperic.hq.appdef.server.session.AgentManagerEJBImpl"
factory-method="getOne"/>
... for all EJBs
<tx:jta-transaction-manager />
<tx:annotation-driven />
<context:annotation-config />
<context:component-scan base-package="org.hyperic,com.hyperic">
<context:include-filter type="annotation"
expression="org.springframework.stereotype.Service"/>
</context:component-scan>
</beans>

Converted EJB Lookup
public class AgentManagerEJBImpl implements SessionBean {
public static AgentManagerLocal getOne() {
try {
return AgentManagerUtil.getLocalHome().create();
} catch (Exception e) {
throw new SystemException(e);
}
}
}

Application Context Instantiation
public class Bootstrap {
private static final String[] APP_CONTEXT_FILES = new String[]
{ "classpath*:/META-INF/spring/dao-context.xml" };
private static final String[] EJB_APP_CONTEXT_FILES = new String[]
{ "classpath*:/META-INF/spring/ejb-*context.xml" };
private static ApplicationContext APP_CONTEXT;
public synchronized static ApplicationContext getContext() throws
Exception {
boolean initialize = false;
if (APP_CONTEXT == null) {
initialize = true;
APP_CONTEXT = new ClassPathXmlApplicationContext
(APP_CONTEXT_FILES, false);
}
if (initialize) {
((ConfigurableApplicationContext) APP_CONTEXT).refresh();
}
return APP_CONTEXT;
}

Application Context Instantiation (2)
public static synchronized void loadEJBApplicationContext() throws
Exception {
APP_CONTEXT = new ClassPathXmlApplicationContext
(EJB_APP_CONTEXT_FILES, APP_CONTEXT);
}
public static <T> T getBean(Class<T> beanClass) throws Exception {
Collection<T> beans = getContext().getBeansOfType(beanClass).values();
... lookup from parent context if not found
return beans.iterator().next();
}
public static Object getBean(String name) throws Exception {
Object bean = getContext().getBean(name);
... lookup from parent context if not found
return bean;
}

Data Access and Transactions with Spring
and EJB
• Added Commons DBCP BasicDataSource
• Added TransactionAwareDataSourceProxy to allow legacy
code making direct use of DataSource to participate in
Spring-managed transactions
• Added a Spring JTATransactionManager and
@Transactional scanning to support transactions for
converted EJBs
28

Hibernate with Spring and EJB
• Moved creation of Hibernate SessionFactory to Spring's
LocalSessionFactoryBean
• Integrated Hibernate Session management with Spring
transaction management
• The following 4 ways of obtaining a Hibernate session will
all go through the same Spring-managed
SessionFactoryUtils to ensure that each thread will share
a single Hibernate session, regardless of which point was
entered first
1. Hibernate Session is opened during a web request
2. Hibernate Session is opened at beginning of a CMT through the
JBossInterceptor
3. Hibernate Session is opened at beginning of Spring-managed transaction
(currently those converted EJBs marked @Transactional)
4. Hibernate Session is opened by call to HQ SessionManager.runInSession
29

Hibernate with Spring and EJB(2)
hibernate.properties
hibernate.current_session_context_class=org.springframework.orm.hibernat
e3.SpringSessionContext
hibernate.transaction.factory_class=org.hibernate.transaction.JTATransaction
Factory
jta.UserTransaction=UserTransaction
• Hibernate Session is opened during a web request
- Spring OpenSessionInViewFilter
• Hibernate Session is opened at beginning of a CMT through
the JBossInterceptor
- Existing interceptor modified to obtain/start Hibernate sessions through
SessionFactory.currentSession()
• Hibernate Session is opened at beginning of Spring-
managed transaction (currently those converted EJBs
marked @Transactional)
- SpringSessionContext

Hibernate with Spring and EJB(3)
Session opened by call to HQ SessionManager
private void runInSessionInternal(final SessionRunner r) throws Exception {
boolean participate = false;
try {
! if (TransactionSynchronizationManager.hasResource(getSessionFactory())) {
! // Do not modify the Session: just set the participate flag.
! participate = true;
! } else {
! Session session = SessionFactoryUtils.getSession(getSessionFactory(), true);
! session.setFlushMode(FlushMode.MANUAL);
! TransactionSynchronizationManager.bindResource(getSessionFactory(), new
SessionHolder(session));
! }
! HibernateTemplate template = getHibernateTemplate();
! template.execute(new HibernateCallback() {...});
! } finally {
! if (!participate) {
! // single session mode
! SessionHolder sessionHolder = (SessionHolder)
TransactionSynchronizationManager.unbindResource(getSessionFactory());
! SessionFactoryUtils.closeSession(sessionHolder.getSession());
! }

EJB Conversion Checklist
Convert Local Interface
Remove "extends javax.ejb.EJBLocalObject" from the
Local interface
- i.e. AgentManagerLocal
1. Rename the Local interface implemented by the EJB by
removing "Local" from the name
- i.e. AgentManagerLocal becomes AgentManager
2. Replace fully-qualified type names with import-based type
names
- especially in the Local interface
3. Delete Util and LocalHome classes
- i.e. AgentManagerUtil and AgentManagerLocalHome
32

Convert Implementation
Rename the EJB (using Eclipse Refactor->Rename to
update dependencies) by removing "EJB" from the name
- i.e. AgentManagerEJBImpl becomes AgentManagerImpl
1. Remove "implements SessionBean" from EJB class
declaration and make class implement its corresponding
Local interface
2. Move initialization logic from ejbCreate() to an init method
annotated with @PostConstruct
33
@PostConstruct
public void initPager() throws Exception {
valuePager = Pager.getPager(VALUE_PROCESSOR);
}

Convert Implementation (2)
4. Remove all ejb* methods (i.e. ejbCreate) and
setSessionContext method
5. Convert getOne() method to the following:
34
public static AgentManager getOne() {
return Bootstrap.getBean(AgentManager.class);
}
6. Mark the converted EJB with @Service
7. Remove the converted EJBʼs entry from ejb-context.xml

Convert Implementation (3)
8. Remove all mention of the EJB from deployment
descriptors in the HQ/dd or HQ-EE/dd directories
9. If the class is marked with * @ejb:transaction
type="REQUIRED" (prior XDoclet markup for generating
CMT), mark the class @Transactional.
- If any methods are marked with a different ejb:transaction
type, (for example, ejb:transaction
type="REQUIRES_NEW), ignore them and document
10.Remove all the XDoclet markup from javadoc
35

Dependency Injection
1. Remove any EJB dependencies and helper classes
obtained through static lookup
Example:
36
public class SomeConvertedEJB {
private void doSomething() {
EscalationManagerLocal escMan =
EscalationManagerEJBImpl.getOne();
escMan.escalate();
}
Becomes:
public class SomeConvertedEJB {
private EscalationManagerLocal escalationManager;
private void doSomething() {
escalationManager.escalate();
}

Dependency Injection(2)
2. Inject DAOs, EJBs and converted EJBs, and helper
classes by auto-wiring the constructor
37
@Service
@Transactional
public class AgentManagerImpl {
private ResourceEdgeDAO resourceEdgeDAO;
private ServerManagerLocal serverManager;
@Autowired
public AgentManagerImpl(ResourceEdgeDAO
resourceEdgeDAO, ServerManagerLocal serverManager) {
this.resourceEdgeDAO = resourceEdgeDAO;
this.serverManager = serverManager;
}

Struts 1.x and Spring
Added Spring ContextLoader plugin to enable Spring
to manage Struts actions as Beans
struts-config.xml
38
<action path="/escalation/ListActiveEscalations"
scope="request"
type="org.springframework.web.struts.DelegatingActionProxy"/>
<plug-in
className="org.springframework.web.struts.ContextLoaderPlugIn">
<set-property property="contextConfigLocation"
! ! value="/WEB-INF/spring/action-servlet.xml" />
</plug-in>
<bean name="/escalation/ListActiveEscalations"
class="org.hyperic.hq.ui.json.action.escalation.finder.ListActiveEscala
tions" />
action-servlet.xml

M2 Goal
Convert the JBoss-dependent HQ EAR into a single
JBoss-dependent WAR
40

Message-Driven EJB Conversion
• Only 3 MDBs listening to a single JMS topic
• Applied conversion checklist to MDBs
• Subscribed newly converted POJOs to JMS topic using
Spring JMS
jms-context.xml
41
<bean id="registeredDispatcher"
class="org.hyperic.hq.bizapp.server.mdb.RegisteredDispatcherImpl"/>
<jms:listener-container destination-type="topic" concurrency="1"
acknowledge="dups-ok" >
<jms:listener destination="topic/eventsTopic"
ref="registeredDispatcher"/>
</jms:listener-container>

JMS Message Broker Conversion
42
• Introduced embedded ActiveMQ broker to replace
JBossMQ
- Easy to configure with Spring
- Often 10x faster than JBossMQ
• Conversion not technically necessary in this project phase,
but took very little time to implement

ActiveMQ Configuration
43
<amq:broker brokerName="localhost">
! <amq:systemUsage>
! ! <amq:systemUsage>
! ! ! <amq:memoryUsage>
! ! ! <amq:memoryUsage limit="${server.jms.maxmemory} mb" />
! ! ! </amq:memoryUsage>
! ! </amq:systemUsage>
! </amq:systemUsage>
</amq:broker>
<amq:connectionFactory id="jmsFactory" brokerURL="vm://localhost?
create=false" />
<bean id="connectionFactory"
class="org.apache.activemq.pool.PooledConnectionFactory">
! <property name="connectionFactory" ref="jmsFactory" />
</bean>

JMS Producer Conversion
Modified single Producer to use Spring JMSTemplate for
message publishing
jms-context.xml
44
<bean id="eventsJmsTemplate"
class="org.springframework.jms.core.JmsTemplate">
! ! <property name="connectionFactory" ref="connectionFactory" />
! ! <property name="defaultDestinationName" value="topic/
eventsTopic" />
! <property name="pubSubDomain" value="true" />
</bean>

JMS Producer: Before
45
public void publishMessage(String name, Serializable sObj) {
TopicConnection conn = null;
TopicSession session = null;
if (_ic == null)
_ic = new InitialContext();
if (_factory == null)
_factory = _ic.lookup(CONN_FACTORY_JNDI);
TopicConnectionFactory tFactory = (TopicConnectionFactory) _factory;
Topic topic = getTopic(name);
if (topic != null) {
// Now create a connection to send a message
if (_tConn != null)
conn = _tConn;
else
conn = tFactory.createTopicConnection();
if (conn == null)
_log.error("TopicConnection cannot be created");
if (_tSession != null)
session = _tSession;
else
session = conn.createTopicSession(false,
Session.AUTO_ACKNOWLEDGE);
// Create a publisher and publish the message
TopicPublisher publisher = session.createPublisher(topic);
ObjectMessage msg = session.createObjectMessage();
msg.setObject(sObj);
publisher.publish(msg);

JMS Producer: After
46
public void publishMessage(String name, Serializable sObj) {
eventsJmsTemplate.convertAndSend(name, sObj);
}

MBean Conversion
47
• EAR contained several JBoss SARs (Service Archive files)
registering MBeans with product functionality
• Most MBeans not actually used for runtime management
and monitoring
• JBoss Scheduler MBeans
- A few classes registered as MBeans just to integrate with
JBoss Schedulers
- Registered JBoss schedulers programmatically
• JBoss Mail Service MBean
- Registered JBoss mail service programmatically
• JBoss Deployment Scanner
- Used for hot deploy of product plugins. Temporarily disabled

JMX with Spring
48
<beans>
<context:mbean-export />
! <context:mbean-server />
Switched to Spring JMX for exposure of actual management
and monitoring interfaces
@ManagedResource("hyperic:type=Service,name=ProductPluginDeployer")
@Service
public class ProductPluginDeployer {
@ManagedMetric
public int getProductPluginCount() {...}
@ManagedAttribute
public ArrayList<String> getRegisteredPlugins(String type) {...}
@ManagedOperation
public void setProperty(String name, String value) {...}

Web Conversion
49
• Added Spring WebApplicationContext
• Kept Bootstrap class for static access to Web App Context
web.xml
<context-param>
! <param-name>contextConfigLocation</param-name>
! <param-value>
! ! classpath*:/META-INF/spring/*-context.xml
! </param-value>
</context-param>
!
<listener>
! <listener-
class>org.hyperic.hq.context.BootstrapContextLoaderListener</listener-
class>
</listener>
• Auto-wired Struts actions with Service dependencies

Transaction Management
50
Switched from JTA TransactionManager to Hibernate
TransactionManager
<beans>
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionMana
ger"
! ! p:defaultTimeout="900">
! ! <property name="sessionFactory" ref="sessionFactory" />
! </bean>

M3 Goal
Run the basic HQ and HQ EE wars on Tomcat, breaking
all EJB and JBoss dependencies
-Deferring some advanced functionality to a future milestone:
-Unidirectional agent (JBoss Remoting)
-HA
-Kerberos and LDAP authentication
-Plugin hot deploy
52

Security Conversion
Replaced JBoss JAAS for simple JDBC login with Spring
Security 3
53
<bean id="passwordEncoder"
class="org.springframework.security.authentication.encoding.Md5Pass
wordEncoder">
! ! <property name="encodeHashAsBase64" value="true" />
</bean>!
! <bean id="internalAuthenticationProvider"
class="org.hyperic.hq.security.InternalAuthenticationProvider"/>
<bean id="authenticationManager"
class="org.springframework.security.authentication.ProviderManager">
! <property name="providers">
!
! <list>
!
! ! <ref local="anonymousAuthenticationProvider" />
! ! <ref local="internalAuthenticationProvider" />
!
! </list>
! </property>
</bean>

Scheduling Conversion
Replaced use of JBoss Scheduler MBeans with Spring
3.0 Scheduler/TaskExecutor abstraction
54
<task:scheduler id="scheduler" pool-size="10"/>
@Service("availabilityCheckService")
public class AvailabilityCheckServiceImpl implements
AvailabilityCheckService {
@Scheduled(fixedRate=120000)
public void backfill() {
...
}
}

The Last of EJB and JBoss....
• Merged JBoss logging config from custom jboss-log4j.xml
to single log4j.xml
• Removed EJB and Remote Exceptions from all method
throws clauses
• Replaced references to JBoss server home directory and
JBoss temp dir for File I/O
55

Final Steps
Deployed the WAR on Tomcat as the ROOT webapp
• When we ported the WAR from JBoss to Tomcat, we only
had to fix 2 small issues before it functioned properly:
- jsp-api.jar was causing conflicts and had to be removed
from WAR
- A few resources (such as images) were being loaded using
getResourceAsStream() from the WebAppClassLoader
(getClass().getClassLoader()). In JBoss, the ClassLoader
could load relative to top-level WAR dir. On Tomcat, the
ClassLoader is relative to WEB-INF/classes.
56

M4 Goal
• Fully installable server and agent distros for all supported
OS/DB combos
-Still missing features left un-implemented in M3
58

M4 Tasks
• Removed all static "getOne" accessor methods from EJBs
• Optimized performance by marking some @Transactionals
as "ReadOnly”
• Created installable servers/agents
- User-configurable properties in a single properties file
(aggregating several JBoss config files)
- Spring PropertyPlaceholderConfigurer makes property
injection easy
- Bundled Tomcat (.org) and tc Server (.com) with final distros
- Added custom config of Tomcat and tc Server
- catalina.properties extracts most container configuration to a
single file
- Modified ant-based installer program
• Developed an integration test of a converted EJB as
template for future testing (using a MySQL database)
59

Demo
Integration Testing with Spring

M5 Goals
• Fully functional product achieving parity with previous
release
• Build system converted from Ant to Maven
62

M5 Tasks
63
• Replaced BasicDataSource with the Tomcat DataSource
(high concurrency connection pool)
• Added LazyConnectionDataSourceProxy
• Added hot deploy of plugins using Roo FileWatcher
• Implemented LDAP authentication with Spring LDAP
• Re-enabled JGroups to complete HA use cases
- Had to manually register a few JBoss MBeans as part of the
web app
• Implemented Kerberos AuthenticationProvider
• Re-enabled JBoss Remoting servlet for unidirectional
agent communications
• Converted build system from Ant to Maven (approx 2
weeks of one person’s time)
• Manual merge of changes made in previous product
releases

Some Final Tweaks
Data Access Before
65
public int getServicesCount(AuthzSubject subject) {
Statement stmt = null;
ResultSet rs = null;
Integer subjectId = subject.getId();
try {
Connection conn = getDBConn();
String sql = "SELECT COUNT(SVC.ID) FROM TBL_SERVICE";
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
if (rs.next()) {
return rs.getInt(1);
}
} catch (SQLException e) {
log.error("Caught SQL Exception finding Services by type: " + e, e);
throw new SystemException(e);
} finally {
DBUtil.closeJDBCObjects(LOG_CTX, null, stmt, rs);
}
return 0;

Some Final Tweaks
Data Access After
66
public int getServicesCount(AuthzSubject subject) {
String sql = "SELECT COUNT(SVC.ID) FROM TBL_SERVICE";
return jdbcTemplate.queryForInt(sql);
}

Some Final Tweaks
Replaced Tapestry with Spring MVC
67
Replaced a small number of Tapestry Components with
Spring MVC @Controller and @RequestMapping
@Controller
public class SearchController extends BaseController {
@RequestMapping(method = RequestMethod.GET, value = "/search")
! public @ResponseBody
! Map<String, List<String>> listSearchResults(
! ! ! @RequestParam(RequestParameterKeys.SEARCH_STRING)
String searchString,
! ! ! HttpSession session) {
...
}

Wrapping It Up
Improved maintainability, testability, and reliability
68
• Reduced code complexity
• Quicker application start time
• Easier to test product in isolation
• 18% and 12% improvement in unit/integration test code
coverage for .org and .com codebases, respectively
• Approx 7% code reduction in .org and .com codebases
• Faster turnaround time for bug fixes
• Easily extensible architecture allows quicker development
of new features

What’s Next?
69
• Finish conversion from Struts to Spring MVC
• Use MVC to provide WS endpoints, eliminating the need
for existing HQApi groovy controllers
• Eliminate remaining static lookup via the Bootstrap class
• Eliminate passing of auth tokens in method signatures
• Finish conversion of direct SQL in service layer to DAOs
using JdbcTemplate
• Improve scalability

Q&A

Resources
71
• Hyperic 4.5 Beta Release
- Open Source
http://sourceforge.net/projects/hyperic-hq/files/
- Enterprise Edition
http://www.springsource.com/landing/vfabric-hyperic-45-beta
• Hyperic Development Resources
- Cloning source
- Building from source
- Building plugins
- Accessing maven repo
http://support.hyperic.com/display/EVO/Development+Resources
• tc Server Eval Download
http://www.springsource.com/products/tc-server-evaluation

Case Study: Migrating Hyperic from EJB to Spring from JBoss to Apache Tomcat

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