Perdendo a Sessao?

Opa!Tô pegando uma sessão do usuario,mas tô recebendo um nullpointer aqui esquisito!O JSP:

&lt;%@ page language=&quot;java&quot; import=&quot;com.siap.*,org.prevayler.*&quot; %&gt;
&lt;%
   Prevayler prevayler = &#40;Prevayler&#41;this.getServletContext&#40;&#41;.getAttribute&#40;&quot;prevayler&quot;&#41;;
   Turma&#91;&#93; turmas = &#40;&#40;SistemaAcademico&#41;prevayler.prevalentSystem&#40;&#41;&#41;.getTurmas&#40;&#41;;
   Usuario usuario=&#40;Usuario&#41;session.getAttribute&#40;&quot;usuario&quot;&#41;;
%&gt;

&lt;html&gt;&lt;head&gt;&lt;title&gt;SIAP-2004&lt;/title&gt;
&lt;meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=iso-8859-1&quot;&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;p&gt;&lt;h3&gt;Turmas liberadas para cursar&#58;&lt;/h3&gt;&lt;/p&gt;
&lt;form method=&quot;POST&quot; action=&quot;matriculaConfirmada.jsp&quot;&gt;


&lt;table border=0&gt;&lt;caption&gt;Selecione as disciplinas para matrícula&#58;&lt;/caption&gt;  
 &lt;tr&gt;&lt;th&gt;vazio&lt;/th&gt;&lt;th&gt;Turma&lt;/th&gt;&lt;th&gt;Matéria&lt;/th&gt;&lt;th&gt;Professor&lt;/th&gt;&lt;th&gt;Dia&#40;s&#41;&lt;/th&gt;&lt;th&gt;Horário&lt;/th&gt;&lt;th&gt;Sala&lt;/th&gt;&lt;th&gt;Campus&lt;/th&gt;    
  
 &lt;%  Turma turma;
      for&#40;int i = 0; i &lt; turmas.length; i++&#41;&#123;
              turma=turmas&#91;i&#93;;
        if&#40;turma.getCurso&#40;&#41;.equals&#40;usuario.idCurso&#41;&#41; 
          out.println&#40;&quot;&lt;tr&gt;&quot;+&quot;&lt;th&gt;&quot;+&quot;&lt;input type=CHECKBOX name=&quot;+&quot;turma&quot;+&quot;&gt;&quot;+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.idTurma+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.nomeDaMateria+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.nomeDoProfessor+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.diaDaSemana+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.horario+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.nomeSala+&quot;&lt;/th&gt;&quot;+&quot;&lt;th&gt;&quot;+turma.nomeCampus+&quot;&lt;/th&gt;&quot;+&quot;&lt;/tr&gt;&quot;&#41;;   
  %&gt;  

&lt;/table&gt;

      
&lt;%    &#125;    %&gt;

&lt;center&gt;&lt;input type=&quot;submit&quot; value=&quot;Matricular&quot;&gt;&lt;/center&gt;
&lt;/form&gt;&lt;/body&gt;&lt;/html&gt;

A Stack:

2004-10-26 23&#58;05&#58;47 StandardWrapperValve&#91;jsp&#93;&#58; Servlet.service&#40;&#41; for servlet jsp threw exception
java.lang.NullPointerException
	at org.apache.jsp.Matricula_jsp._jspService&#40;Matricula_jsp.java&#58;69&#41;
	at org.apache.jasper.runtime.HttpJspBase.service&#40;HttpJspBase.java&#58;94&#41;
	at javax.servlet.http.HttpServlet.service&#40;HttpServlet.java&#58;802&#41;
	at org.apache.jasper.servlet.JspServletWrapper.service&#40;JspServletWrapper.java&#58;324&#41;
	at org.apache.jasper.servlet.JspServlet.serviceJspFile&#40;JspServlet.java&#58;292&#41;
	at org.apache.jasper.servlet.JspServlet.service&#40;JspServlet.java&#58;236&#41;
	at javax.servlet.http.HttpServlet.service&#40;HttpServlet.java&#58;802&#41;
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter&#40;ApplicationFilterChain.java&#58;237&#41;
	at org.apache.catalina.core.ApplicationFilterChain.doFilter&#40;ApplicationFilterChain.java&#58;157&#41;
	at org.apache.catalina.core.StandardWrapperValve.invoke&#40;StandardWrapperValve.java&#58;214&#41;
	at org.apache.catalina.core.StandardValveContext.invokeNext&#40;StandardValveContext.java&#58;104&#41;
	at org.apache.catalina.core.StandardPipeline.invoke&#40;StandardPipeline.java&#58;520&#41;
	at org.apache.catalina.core.StandardContextValve.invokeInternal&#40;StandardContextValve.java&#58;198&#41;
	at org.apache.catalina.core.StandardContextValve.invoke&#40;StandardContextValve.java&#58;152&#41;
	at org.apache.catalina.core.StandardValveContext.invokeNext&#40;StandardValveContext.java&#58;104&#41;
	at org.apache.catalina.core.StandardPipeline.invoke&#40;StandardPipeline.java&#58;520&#41;
	at org.apache.catalina.core.StandardHostValve.invoke&#40;StandardHostValve.java&#58;137&#41;
	at org.apache.catalina.core.StandardValveContext.invokeNext&#40;StandardValveContext.java&#58;104&#41;
	at org.apache.catalina.valves.ErrorReportValve.invoke&#40;ErrorReportValve.java&#58;117&#41;
	at org.apache.catalina.core.StandardValveContext.invokeNext&#40;StandardValveContext.java&#58;102&#41;
	at org.apache.catalina.core.StandardPipeline.invoke&#40;StandardPipeline.java&#58;520&#41;
	at org.apache.catalina.core.StandardEngineValve.invoke&#40;StandardEngineValve.java&#58;109&#41;
	at org.apache.catalina.core.StandardValveContext.invokeNext&#40;StandardValveContext.java&#58;104&#41;
	at org.apache.catalina.core.StandardPipeline.invoke&#40;StandardPipeline.java&#58;520&#41;
	at org.apache.catalina.core.ContainerBase.invoke&#40;ContainerBase.java&#58;929&#41;
	at org.apache.coyote.tomcat5.CoyoteAdapter.service&#40;CoyoteAdapter.java&#58;160&#41;
	at org.apache.coyote.http11.Http11Processor.process&#40;Http11Processor.java&#58;799&#41;
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection&#40;Http11Protocol.java&#58;705&#41;
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt&#40;PoolTcpEndpoint.java&#58;577&#41;
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run&#40;ThreadPool.java&#58;683&#41;
	at java.lang.Thread.run&#40;Thread.java&#58;534&#41;

Alguém tem alguma idéia?

2 Respostas

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