Invisible Safety,

Proven by Intelligence

Proving Invisible Safety Through Intelligence.

Training Courses
We offer customized training programs to ensure the effective implementation of MDS Intelligence solutions.
VectorCAST 사용자 교육
Days/Hours
1Days / 7Hours (09:30~17:00)
Lecturer
담당 엔지니어
Training Fee
550,000KRW (VAT Included)
Capacity
10
Full Training Schedule
Training Schedule Application Deadline Register Training Location
1월 8, 2026 (목) Jan 7, 2026 (Wed)
when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${data.classroom.locationLongitude} [in template "app/en/support/eduCourse-read.ftl" at line 108, column 82] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) at freemarker.core.UnexpectedTypeException.newDescriptionBuilder(UnexpectedTypeException.java:85) at freemarker.core.UnexpectedTypeException.(UnexpectedTypeException.java:48) at freemarker.core.NonHashException.(NonHashException.java:49) at freemarker.core.Dot._eval(Dot.java:57) at freemarker.core.Expression.eval(Expression.java:101) at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:104) at freemarker.core.DollarVariable.accept(DollarVariable.java:63) at freemarker.core.Environment.visit(Environment.java:380) at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321) at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271) at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244) at freemarker.core.Environment.visitIteratorBlock(Environment.java:654) at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:344) at freemarker.core.Environment.visit(Environment.java:350) at freemarker.core.Environment.visit(Environment.java:350) at freemarker.core.Environment.process(Environment.java:323) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:441) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:345) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:296) at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:181) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:307) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1305) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1042) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1003) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) at org.springframework.web.servlet.resource.ResourceUrlEncodingFilter.doFilter(ResourceUrlEncodingFilter.java:66) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:199) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) at org.springframework.web.filter.ForwardedHeaderFilter.doFilterInternal(ForwardedHeaderFilter.java:174) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1778) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57) at java.base/java.lang.Thread.run(Unknown Source)