eod features and component dependencies in java ee 5 app server 9.xnew

《eod features and component dependencies in java ee 5 app server 9.xnew》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、EoDFeaturesandComponentDependenciesinJavaEE5/AppServer9.xKennethSaksEJBContainerLeadkenneth.saks@sun.comGoal•AcloserlookatcomponentenvironmentdependenciesinJavaEE5andAS9.x•Betterunderstandingof:>DifferencebetweencomponentnamespaceandAppServer-specific(global)namespace>Relations

2、hipbetweenJavaEE5dependencyannotations,standard.xmldescriptors,andvendor-specific.xmldescriptors>AS9.xuserexperienceimprovements2Agenda•Componentdependenciesin.xml•Componentdependenciesviaannotations•AS9.xuserexperienceenhancements•Q&A3ComponentDependencies•Declarationbybeandev

3、eloperthatacomponent(ejb,servlet,jsp,appclient)requiressomedata,resource,orothercomponent.•Examples:>UsingaDataSourcetoaccessadatabase>InvokinganEnterpriseJavaBean>Consumingawebservice>SendingaJMSmessage>Accessingaconfigurablepropertyvalue4Advantagesofdeclaringcomponentdependen

4、cies•Betterdeployment-timeerrorchecking•Separationofconcerns:developmentvs.deployment•Portability:cleardistinctionbetweenstandardinformationandvendor-specificinformation•Preventshard-coding.Actualmappings/valuescanbechangedwithouttouchingcode.5ServletaccessingdatabaseServletA.j

5、avaInitialContextic=newInitialContext();DataSourceds=(DataSource)ic.lookup(“java:comp/env/jdbc/FooDS”);web.xmljdbc/FooDSjavax.sql.DataSource6Componentnamespacew/ophysicalresourcemappingServletAjava:c

6、omp/env/jdbc/FooDS?Unresolvedcomponentdependency7CreatingphysicalAppServerresourcesAppServerGlobalJNDINamespace/%asadmincreate-jdbc-resource“jdbc/OracleDS”...jdbc/OracleDS%asadmincreate-jdbc-resource“jdbc/DerbyDS”...jdbc/DerbyDS%asadmincreate-jdbc-resource“jdbc/FooDS”...jdbc/Fo

7、oDS%asadmincreate-jms-resource“jms/FooQueue”...jms/FooQueue8Servletaccessingdatabase(cont.)sun-web.xmljdbc/FooDSjdbc/OracleDS•res-ref-nameisthenameofacomponentdependencyandisrelativetojava:comp/env

8、•jndi-nameisthenameofaphysicalAppServerresourceandisre