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java.lang.NullPointerException: 	at sg.edu.nus.ugspa.config.web.WebApplicationInitializer.onStartup(WebApplicationInitializer.java:43)	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:175)	at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:184)	at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:100)	at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:82)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)	at org.jboss.threads.JBossThread.run(JBossThread.java:320)