Servlets :: Java Class - Session Variable Error

Dec 14, 2014

My dynamic web project has a java class that captures a session variable with the following code.

HttpSession LoginSession = request.getSession();
String VAR = LoginSession.getAttribute("myVar").toString(); //This is the row 127

If i test the app in local (Mac + Java 1.8 + Tomcat 8) all works. In my remote cloud server (Ubuntu 14.10 + Java 1.8 + Tomcat 8) all works, except this class, that has this code. I copy the complete error here. Note that the row 127 of the error message is the second row of the previous code; and, if i comment this row with // and assign a fix variable all works. So, the problem is that 127^ row.

14-Dec-2014 08:15:23.923 SEVERE [http-nio-8080-exec-14] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [srvNavigation.SrvPT] in context with path [/myapp] threw exception
java.lang.NullPointerException
at srvNavigation.SrvPT.doGet(SrvPT.java:127)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)

[Code] ....

How can i solve the problem?

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package ABC;
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[Code] .....

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I get this error

at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
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Java Code:

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[Code] .....

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[code].....

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[Code] .....

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[Code] ....

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[Code] ....

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I attached an image of what menu object looks like.

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[Code] ....

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