Why run sample war in weblogic server error?

Error 500--Internal Server Error

javax.servlet.ServletException: [HTTP:101249][ServletContext(id=2896154,name=Northwind,context-path=/Northwind)]: Servlet class NorthwindServlet for servlet NorthwindServlet could not be loaded because the requested class was not found in the classpath C:\bea\user_projects\domains\mydomain\myserver\.wlnotdelete\extract\myserver_Aspose_Excel_Northwind\Northwind.war;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_Aspose_Excel_Northwind\jarfiles\WEB-INF\lib\Aspose.Excel.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_Aspose_Excel_Northwind\jarfiles\_wl_cls_gen.jar;C:\bea\user_projects\domains\mydomain\.\myserver\.wlnotdelete\extract\myserver_Aspose_Excel_Northwind.
java.lang.UnsupportedClassVersionError: NorthwindServlet (Unsupported major.minor version 49.0).
	at weblogic.servlet.internal.ServletStubImpl.prepareServlet(Lweblogic.servlet.internal.RequestCallback;)V(ServletStubImpl.java:834)
	at weblogic.servlet.internal.ServletStubImpl.getServlet(Lweblogic.servlet.internal.RequestCallback;)Ljavax.servlet.Servlet;(ServletStubImpl.java:535)
	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;Lweblogic.servlet.internal.FilterChainImpl;)V(ServletStubImpl.java:373)
	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;)V(ServletStubImpl.java:315)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run()Ljava.lang.Object;(WebAppServletContext.java:6718)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic.security.subject.AbstractSubject;Ljava.security.PrivilegedAction;)Ljava.lang.Object;(AuthenticatedSubject.java:321)
	at weblogic.security.service.SecurityManager.runAs(Lweblogic.security.acl.internal.AuthenticatedSubject;Lweblogic.security.acl.internal.AuthenticatedSubject;Ljava.security.PrivilegedAction;)Ljava.lang.Object;(SecurityManager.java:121)
	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(Lweblogic.servlet.internal.ServletRequestImpl;Lweblogic.servlet.internal.ServletResponseImpl;)V(WebAppServletContext.java:3764)
	at weblogic.servlet.internal.ServletRequestImpl.execute(Lweblogic.kernel.ExecuteThread;)V(ServletRequestImpl.java:2644)
	at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest;)V(ExecuteThread.java:219)
	at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178)
	at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Source)

Is your weblogic based on Java runtime 5.0?

thank you answer .