Bonnes pratiques des applications java prêtes pour la production

Bonnes Pratiques
Des
Applications Java
Prêtes pour la Production

des Prêtes pour la
Bonnes Pratiques
Applications Java Production

Cyrille Le Clerc

Sunday, June 13, 2010

Cyrille Le Clerc

 Architecte Java EE depuis 11 ans

 Committer Apache CXF

 Directeur associé chez Xebia

cleclerc@xebia.fr

www.xebia.fr / blog.xebia.fr 2

Les enjeux

 Améliorer la disponibilité des applications

 Réduire le cycle de vie des projets

 Améliorer les plateformes

 Diminuer le coût d’exploitation


Les axes clefs

 Le déploiement

 La supervision et le monitoring

 La gestion des logs

 La robustesse

 L’organisation


Le Déploiement

 Minimiser le nombre de composants à déployer

 Colocation friendly

 Les paramètres de configuration

 La traçabilité


Le Déploiement

Minimiser le nombre de composants à déployer


Minimiser le nombre de composants à
déployer
my-app

html *.html
*.html

css

img

js

jsp
*.jsp
*.jsp

WEB-INF

classes

lib

www.xebia.fr / blog.xebia.fr
web.xml 5

déployer
my-app

html
*.html just in case
css

img

js

jsp *.jsp
*.jsp
# don't proxy static content !
ProxyPassMatch ^(/my/.*.html)$ ! WEB-INF

ProxyPassMatch ^(/my/.*.css)$ ! classes
2 1
ProxyPassMatch ^(/my/.*.gif)$ ! lib

ProxyPassMatch ^(/my/.*.jpeg)$ !
ProxyPassMatch ^(/my/.*.png)$ ! web.xml

ProxyPassMatch ^(/my/.*.js)$ !

# proxy dynamic content my-app static ﬁles my-app.war
ProxyPass /my/ http://my:8080/my/
Apache Httpd Tomcat
3 httpd.conf


déployer
my-app

html
*.html

css

img

js

jsp *.jsp
*.jsp

WEB-INF

classes

lib
# proxy /my/ 1
ProxyPass /my/ http://my:8080/my/ web.xml

2 httpd.conf my-app static ﬁles my-app.war

Cache Proxy Apache Httpd Tomcat


Colocation friendly

 Colocalisation de serveur (Linux, Windows, etc)
▶ Minimiser les répertoires absolus et les ports réseaux
▶ Ports dédiés par application (e.g. http : 10080)
▶ Chemins dédiés de répertoires (e.g. /etc/my-app-1/...)

 Colocalisation de serveur Java EE
▶ Ne pas utiliser de variable statique
▶ Chemins dédiés de répertoires (e.g. ${java.io.tmpdir}/my-app-1/...)


Le Déploiement

Les paramètres de configuration



 Limiter les paramètres de configuration dont la
valeur change suivant les environnements
▶ Ports réseau standards (e.g. 80, 1521)
▶ Noms logiques de host/serveurs (e.g. my-app-srv-1)
Production

db-α

p1
app-1
1521

/ap
10080
80 srv-i, srv-j, srv-k
...

443 /ap
Internet om db-β
p2
p any.c app-2 1521
m y-com
20080
Firewall srv-l, srv-m, srv-n


Production

db-α

p1
app-1
1521

/ap
10080

Sa
...

m
e
ho
443 /ap

s
.com db-β

tn
p2
pany

Sa
app-2

am
1521
y-com

m
m

es
20080

e
srv-l, srv-m, srv-n

ne
Firewall

tw
or
Ca

k
n

po
Internet NO communication

be

rt
s
sa
m
Validation

e
IP
!
db-α
p1

app-1
1521
/ap

10080
...

proxy 443 /ap
om p2 db-β
any.c app-2 1521
omp
my-c 20080
Firewall srv-l, srv-m, srv-n


Le Déploiement

 La traçabilité
my-app/tags/1.2.3/
artefact taggé

my-app-1.2.3.war

Co
mme
Repository nt
dé
plo
ye
r
?

Dev zone Data centers


Supervision et Monitoring

 Exposer des indicateurs métier

 Logs vs. JSP vs. JMX



Exposer des indicateurs métier

 Suivre les succès et échecs vécus par les
utilisateurs



Logs de monitoring

 Détail par invocation vs. moyenne par minute


Monitoring : logs vs. jsp vs. jmx

JSP
 Attention à la sécurité !
 Human Friendly and/or Script Friendly

/my-app/seye5E7E/jmx/cxf.jsp



JMX
 Sécurité ++
 Simple
 Human Friendly and/or Script Friendly



JMX : Simple

@ManagedResource
public class DemoServiceImpl {

private final AtomicInteger invocationCount = new AtomicInteger();

@ManagedAttribute
public int getInvocationsCount() {
return invocationCount.get();
}

@ManagedOperation
public void purge(){
// ...
}



JMX : VisualVM



JMX : Hyperic HQ & cie



JMX & JSP

Powered by JMX !


La gestion des logs

Exceptions java & stack trace vs. code erreur

Troubleshooting vs. logs longue durée &audit


La gestion des logs

2010/04/12 14:37:19 [catalina-exec-14] WARN o.a.cxf.phase.PhaseInterceptorChain - Application {http://ws.xebia.fr/customer/v1_0}customerService#{http://ws.xebia.fr/customer/v1_0}getCustomer has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: Exception getting customer '71'
at org.apache.cxf.service.invoker.AbstractInvoker.createFault(AbstractInvoker.java:155) ~[cxf-rt-core-2.2.7.jar:2.2.7]
at org.apache.cxf.jaxws.AbstractJAXWSMethodInvoker.createFault(AbstractJAXWSMethodInvoker.java:86) ~[cxf-rt-frontend-jaxws-2.2.7.jar:2.2.7]
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:121) ~[cxf-rt-core-2.2.7.jar:2.2.7]
at org.apache.cxf.jaxws.JAXWSMethodInvoker.invoke(JAXWSMethodInvoker.java:60) ~[cxf-rt-frontend-jaxws-2.2.7.jar:2.2.7]
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58) ~[cxf-rt-core-2.2.7.jar:2.2.7]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) ~[na:1.6.0_17]

Exceptions & stack trace
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) ~[na:1.6.0_17]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) ~[na:1.6.0_17]
at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37) ~[cxf-rt-core-2.2.7.jar:2.2.7]
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106) ~[cxf-rt-core-2.2.7.jar:2.2.7]
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:243) ~[cxf-api-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:110) [cxf-rt-core-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:98) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:423) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:178) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.servlet.AbstractCXFServlet.invoke(AbstractCXFServlet.java:142) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:179) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:103) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) [servlet-api.jar:na]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:159) [cxf-rt-transports-http-2.2.7.jar:2.2.7]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) [catalina.jar:6.0.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:6.0.26]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:343) [spring-security-web-3.0.2.RELEASE.jar:na]

vs.
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:90) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:188) [spring-security-web-3.0.2.RELEASE.jar:na]

code erreur
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:149) [spring-security-web-3.0.2.RELEASE.jar:na]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) [spring-web-3.0.2.RELEASE.jar:3.0.2.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) [spring-web-3.0.2.RELEASE.jar:3.0.2.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) [catalina.jar:6.0.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:6.0.26]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) [catalina.jar:6.0.26]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [catalina.jar:6.0.26]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [catalina.jar:6.0.26]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [catalina.jar:6.0.26]
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555) [catalina.jar:6.0.26]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [catalina.jar:6.0.26]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) [catalina.jar:6.0.26]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) [tomcat-coyote.jar:6.0.26]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) [tomcat-coyote.jar:6.0.26]
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:396) [tomcat-coyote.jar:6.0.26]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_17]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_17]
at java.lang.Thread.run(Thread.java:637) [na:1.6.0_17]
Caused by: java.lang.RuntimeException: Exception getting customer '71'
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl.getCustomer(CustomerServiceImpl.java:101) ~[CustomerServiceImpl.class:na]
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl$$FastClassByCGLIB$$30f63c56.invoke(<generated>) ~[cglib-nodep-2.2.jar:na]
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191) ~[cglib-nodep-2.2.jar:na]
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:692) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at fr.xebia.audit.AuditAspect.logMessage(AuditAspect.java:139) ~[AuditAspect.class:na]
at sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_17]
at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_17]
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:622) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:611) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:625) ~[spring-aop-3.0.1.RELEASE.jar:3.0.1.RELEASE]
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl$$EnhancerByCGLIB$$184a797f.getCustomer(<generated>) ~[cglib-nodep-2.2.jar:na]
at sun.reflect.GeneratedMethodAccessor61.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_17]
at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_17]
at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:173) ~[cxf-rt-core-2.2.7.jar:2.2.7]
... 62 common frames omitted
Caused by: java.lang.RuntimeException: Too many concurrent access to ZeSlowService
at fr.xebia.productionready.backend.zeslowservice.ZeSlowServiceBoundedImpl.find(ZeSlowServiceBoundedImpl.java:57) ~[ZeSlowServiceBoundedImpl.class:na]
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl.updateCustomerWithZeSlowServiceData(CustomerServiceImpl.java:166) ~[CustomerServiceImpl.class:na]
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl.getCustomer(CustomerServiceImpl.java:99) ~[CustomerServiceImpl.class:na]
... 84 common frames omitted

2010/04/12 15:06:09 [catalina-exec-18] WARN o.a.cxf.phase.PhaseInterceptorChain -
Application {http://ws.xebia.fr/customer/v1_0}customerService
#{http://ws.xebia.fr/customer/v1_0}getCustomer has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: Exception getting customer '1'
at org.apache.cxf.service.invoker.AbstractInvoker.createFault(AbstractInvoker.java:155)
Caused by: java.lang.RuntimeException: Exception getting customer '1'
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl.getCustomer(CustomerServiceImpl.java:101)
Caused by: java.lang.RuntimeException: Something went wrong
at fr.xebia.ws.customer.v1_0.CustomerServiceImpl.doSomeWork(CustomerServiceImpl.java:66)


La gestion des logs

>= WARN, compact stack trace, collected
logs
my-app.log
only audit, collected
my-app-audit.log 10x10Mo, rolling,
NOT collected,
my-app-troubleshooting.log mostly >= WARN
my-app-troubleshooting-1.log
...
my-app-troubleshooting-9.log

logs-to-collect easy to collect log files

my-app-audit-20100411.log
my-app-audit-201004....log
...
my-app-20100411.log
my-app-201004...log
...

La gestion des logs

 Audit par annotation
@RolesAllowed("ROLE_USER")
@Audited(message = "CustomerService.getCustomer(#{args[0]})")
public Customer getCustomer(long id) throws MyException {
// ...
}

 Exemple de message
...
2010/04/12-17:18:00:266
CustomerService.getCustomer(12) by ze-remote-app coming from 9.0.1.53
...


La Robustesse

 Dépendances inter-application : fail fast est-il synonyme de
fragilité ?

 Prévention des saturations et des effets
"domino" : l'art du code défensif,

 Les modes dégradés


La Robustesse

 Dépendances inter-application : fail fast est-il synonyme de
fragilité ?

 Bloquer le démarrage pour mauvaise
configuration

 Ne pas bloquer le démarrage pour indisponibilité
d’une dépendance


La Robustesse

 Prévention des saturations et des effets
"domino" : l'art du code défensif

Sh
or
im t tim
po
ssi eou
ble t i
Sometimes ! s
Presentation & Business
Slow
Layer
Service

Sometimes
Presentation & Business Slow
Layer Service

limit concurrent invocations !


La Robustesse

Les modes dégradés

 Mieux vaut-il un service limité ou un système en
panne ?


L’organisation

 Prévoir l’exploitation

 Les développeurs en support niveau 3

 You Build It, You Run It !


L’organisation

Prévoir l’exploitation

 Dès la conception

 Processus itératif


L’organisation

Les développeurs en support niveau 3

 Prendre conscience

 Responsabiliser


L’organisation

“You Build It You Run It !”
Amazon


Formation !

Formation
Applications Java Prêtes pour la Production
Les 17 & 18 Mai 2010 !


Bonnes pratiques des applications java prêtes pour la production

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