501 Internal server error (From WAS)

javax.servlet.forward.request_uri
/web/board/BD_board.list.do
javax.servlet.forward.context_path
javax.servlet.forward.servlet_path
/web/board/BD_board.list.do
javax.servlet.forward.query_string
bbsCd=
encodingFilter.FILTERED
true
org.springframework.web.servlet.DispatcherServlet.THEME_SOURCE
WebApplicationContext for namespace 'dispatcher-servlet': startup date [Mon Sep 02 21:54:54 KST 2019]; parent: Root WebApplicationContext
org.springframework.web.servlet.DispatcherServlet.THEME_RESOLVER
org.springframework.web.servlet.theme.FixedThemeResolver@48e1949c
exception
java.lang.NullPointerException
	at zes.openworks.web.board.BoardController.getBoardServiceName(BoardController.java:143)
	at zes.openworks.web.board.BoardController.setBoardService(BoardController.java:95)
	at zes.openworks.web.board.BoardController.boardList(BoardController.java:216)
	at sun.reflect.GeneratedMethodAccessor650.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at zes.openworks.common.filter.XSSFilter.doFilter(XSSFilter.java:62)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:311)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
	at java.lang.Thread.run(Thread.java:662)
javax.servlet.error.servlet_name
dispatcher
javax.servlet.jsp.jstl.fmt.locale.request
en_US
org.springframework.web.servlet.HandlerMapping.uriTemplateVariables
{}
javax.servlet.jsp.jstl.fmt.localizationContext.request
org.springframework.web.servlet.support.JstlUtils$SpringLocalizationContext@4c8b7925
javax.servlet.error.request_uri
/web/board/BD_board.list.do
org.springframework.web.servlet.DispatcherServlet.CONTEXT
WebApplicationContext for namespace 'dispatcher-servlet': startup date [Mon Sep 02 21:54:54 KST 2019]; parent: Root WebApplicationContext
javax.servlet.error.status_code
200
javax.servlet.error.exception_type
class java.lang.NullPointerException
org.springframework.web.servlet.HandlerMapping.pathWithinHandlerMapping
/web/board/BD_board.list.do
com.opensymphony.sitemesh.APPLIED_ONCE
true
javax.servlet.error.exception
java.lang.NullPointerException
org.springframework.web.servlet.HandlerMapping.bestMatchingPattern
/web/board/BD_board.list.do
org.springframework.web.servlet.DispatcherServlet.LOCALE_RESOLVER
org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver@4c792102