Duvida context

Programação Java
#1

galera fiz curso de j2ee mas to apanhanho nao consigo arrumar este erro ta foda se alguem puder ajudar

javax.naming.NameNotFoundException: Name CursoJ2EE is not bound in this Context
at org.apache.naming.NamingContext.lookup(NamingContext.java:768)
at org.apache.naming.NamingContext.lookup(NamingContext.java:151)
at br.com.biblioteca.daos.ConexaoDAO.getConnection(ConexaoDAO.java:19)
at br.com.biblioteca.daos.UsuarioDAO.inserirUsuario(UsuarioDAO.java:22)
at br.com.biblioteca.actions.SalvarUsuarioAction.execute(SalvarUsuarioAction.java:54)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)
Erro na insercao!
Motivo: null
init OK!
Contexto OK!

Meu Context

<?xml version="1.0" encoding="UTF-8"?> WEB-INF/web.xml abracos
#2

voce esta passando valores que nao pode ser null para base certo ?

context.

		<Resource name="jdbc/sistema" 
				  auth="Container"
		          type="javax.sql.DataSource" 
		          driverClassName="org.postgresql.Driver"
		          url="jdbc:postgresql://localhost:5432/basededados?charSet=LATIN1"
		          username="??" 
		          password="???" 
		          maxActive="20" 
		          maxIdle="10"
		          maxWait="-1"
		          removeAbandoned="true"
                  removeAbandonedTimeout="60"
		          logAbandoned="true"
		/>
    </Context>

[]'s

#3