Tengo este error al modificar un registro en java web con eclipse, no me permite modificar un registro

Context Path:

/appwebagenda

Servlet Path:

/ServletUsuarioEditar

Path Info:

null

Query String:

null

Stack Trace
java. Lang. NullPointerException
com. Enlawebdekaaf. App. Servlet. ServletUsuarioEditar.doGet(ServletUsuarioEditar.java:44)
Javax. Servlet.http.HttpServlet.service(HttpServlet.java:687)
Javax. Servlet.http.HttpServlet.service(HttpServlet.java:790)
Io. Undertow. Servlet. Handlers. ServletHandler.handleRequest(ServletHandler.java:85)
Io. Undertow. Servlet. Handlers. Security. ServletSecurityRoleHandler. HandleRequest(ServletSecurityRoleHandler.java:61)
Io. Undertow. Servlet. Handlers. ServletDispatchingHandler. HandleRequest(ServletDispatchingHandler.java:36)
org. Wildfly. Extension. Undertow. Security. SecurityContextAssociationHandler. HandleRequest(SecurityContextAssociationHandler.java:78)
Io. Undertow. Server. Handlers. PredicateHandler.handleRequest(PredicateHandler.java:43)
Io. Undertow. Servlet. Handlers. Security. SSLInformationAssociationHandler. HandleRequest(SSLInformationAssociationHandler.java:131)
Io. Undertow. Servlet. Handlers. Security. ServletAuthenticationCallHandler. HandleRequest(ServletAuthenticationCallHandler.java:56)
Io. Undertow. Server. Handlers. PredicateHandler.handleRequest(PredicateHandler.java:43)
Io. Undertow. Security. Handlers. AbstractConfidentialityHandler. HandleRequest(AbstractConfidentialityHandler.java:45)
Io. Undertow. Servlet. Handlers. Security. ServletConfidentialityConstraintHandler. HandleRequest(ServletConfidentialityConstraintHandler.java:63)
Io. Undertow. Security. Handlers. AuthenticationMechanismsHandler. HandleRequest(AuthenticationMechanismsHandler.java:58)
Io. Undertow. Servlet. Handlers. Security. CachedAuthenticatedSessionHandler. HandleRequest(CachedAuthenticatedSessionHandler.java:70)
Io. Undertow. Security. Handlers. SecurityInitialHandler. HandleRequest(SecurityInitialHandler.java:76)
Io. Undertow. Server. Handlers. PredicateHandler.handleRequest(PredicateHandler.java:43)
org. Wildfly. Extension. Undertow. Security. Jacc. JACCContextIdHandler. HandleRequest(JACCContextIdHandler.java:61)
Io. Undertow. Server. Handlers. PredicateHandler.handleRequest(PredicateHandler.java:43)
Io. Undertow. Server. Handlers. PredicateHandler.handleRequest(PredicateHandler.java:43)
Io. Undertow. Servlet. Handlers. ServletInitialHandler. HandleFirstRequest(ServletInitialHandler.java:261)
Io. Undertow. Servlet. Handlers. ServletInitialHandler. DispatchRequest(ServletInitialHandler.java:247)
Io. Undertow. Servlet. Handlers. ServletInitialHandler.access$000(ServletInitialHandler.java:76)
Io. Undertow. Servlet. Handlers.ServletInitialHandler$1. HandleRequest(ServletInitialHandler.java:166)
Io. Undertow. Server. Connectors.executeRootHandler(Connectors.java:197)
Io. Undertow. Server.HttpServerExchange$1.run(HttpServerExchange.java:759)
java. Util. Concurrent. ThreadPoolExecutor. RunWorker(Unknown Source)
java. Util. Concurrent.ThreadPoolExecutor$Worker. Run(Unknown Source)
java. Lang. Thread. Run(Unknown Source)

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