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java.lang.NullPointerException in EJB3 from JSP page
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created by <a href="https://community.jboss.org/people/mmunir">Moazzam Munir</a> in <i>EJB3 Development</i> - <a href="https://community.jboss.org/message/649905#649905">View the full discussion</a>
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<div class="jive-rendered-content"><p style="margin-bottom: 1em;">I am developing my first EJB 3 application using JBOSS 7 as application server in Eclipse. The session bean is deployed successfully on the server but when i try to access it from the JSP page, then i get the java.lang.NullPointerException exception.</p><p style="margin-bottom: 1em;">Following is my code:</p><p style="margin-bottom: 1em;"><strong>Local Interface</strong>:</p><p style="margin-bottom: 1em; padding-left: 60px;"><code style="background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">package my.first;<br/><br/>import javax.ejb.Local;<br/><br/>@Local<br/>public interface CalculatorRemote {<br/><br/>     public float add(float x, float y);<br/><br/>     public float subtract(float x, float y);<br/><br/>     public float multiply(float x, float y);<br/><br/>     public float division(float x, float y);<br/>}</code></p><p><strong style="font-size: 12px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">Session bean</strong><span style="color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; font-size: 12px; background-color: #ffffff;">:</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 60px;"><span style="color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; font-size: 12px; background-color: #ffffff;"><code style="background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">package my.first;<br/><br/>    import javax.ejb.LocalBean;<br/>    import javax.ejb.Stateless;<br/><br/>    @Stateless(name = "CalculatorRemote")<br/>    public class CalculatorBean implements CalculatorRemote {<br/>        public float add(float x, float y) {<br/>            return x + y;<br/>        }<br/><br/>        public float subtract(float x, float y) {<br/>            return x - y;<br/>        }<br/><br/>        public float multiply(float x, float y) {<br/>            return x * y;<br/>        }<br/><br/>        public float division(float x, float y) {<br/>            return x / y;<br/>        }<br/>    }</code><br/></span></p><p style="margin-bottom: 1em;"><strong>JSP Page:</strong></p><p style="margin-bottom: 1em; padding-left: 60px;"><code style="background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">     <%!<br/>      private CalculatorRemote calculator = null;<br/>      float result=0;<br/><br/>      public void jspInit() {<br/>      try {<br/><br/>      InitialContext ic = new InitialContext();<br/><br/>      calculator = (CalculatorRemote) ic<br/>      .lookup("CalculatorRemote/Local");<br/><br/><br/>      System.out.println("Loaded Calculator Bean");<br/>    //CalculatorBean<br/><br/>      } catch (Exception ex) {<br/>      System.out.println("Error:"+<br/>      ex.getMessage());<br/>      }<br/>      }<br/>      public void jspDestroy() {<br/>      calculator = null;<br/>      }<br/>    %></code></p><p style="margin-bottom: 1em;"><strong style="font-size: 12px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">Server Log File:</strong></p><p style="margin-bottom: 1em; padding-left: 60px;"><code style="background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">17:17:20,552 INFO  [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-4) JNDI bindings for session bean named CalculatorRemote in deployment unit deployment "EJBsession.jar" are as follows:<br/><br/>        java:global/EJBsession/CalculatorRemote!my.first.CalculatorBean<br/>        java:app/EJBsession/CalculatorRemote!my.first.CalculatorBean<br/>        java:module/CalculatorRemote!my.first.CalculatorBean<br/>        java:global/EJBsession/CalculatorRemote!my.first.CalculatorRemote<br/>        java:app/EJBsession/CalculatorRemote!my.first.CalculatorRemote<br/>        java:module/CalculatorRemote!my.first.CalculatorRemote<br/>        ......<br/>        ......<br/>        ......<br/><br/>        17:23:44,105 ERROR [stderr] (http--127.0.0.1-8080-1) java.lang.NullPointerException<br/><br/>        17:23:44,105 ERROR [stderr] (http--127.0.0.1-8080-1)    at org.apache.jsp.test_jsp._jspService(test_jsp.java:102)<br/><br/>        17:23:44,105 ERROR [stderr] (http--127.0.0.1-8080-1)    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)<br/><br/>        17:23:44,105 ERROR [stderr] (http--127.0.0.1-8080-1)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)<br/><br/>        ......<br/>        ......<br/>        ......</code></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="margin-bottom: 1em;"><span style="color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; font-size: 12px; background-color: #ffffff;">Please help?</span></p></div>
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