我的应用程序是用Grails 2.5.6编写的。当我在开发和生产模式（prod run-app）下运行它时，它可以完美工作。我可以毫无问题地访问Weceem内容管理系统。但是，尝试在已部署的Tomcat应用程序上访问Weceem时遇到以下异常。
2018-12-11 23:56:22,110 [http-bio-8080-exec-7] ERROR errors.GrailsExceptionResolver - NullPointerException occurred when processing request: [GET] /model-repository/wcm-admin/repository/treeTable
Stacktrace follows: org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error applying layout : weceemadmin
at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:198)
at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53)
at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.java:62)
at grails.plugin.springsecurity.web.SecurityRequestHolderFilter.doFilter(SecurityRequestHolderFilter.java:59)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error processing GroovyPageView: null
... 8 more
Caused by: java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:364)
at java.util.Properties.getProperty(Properties.java:969)
at asset.pipeline.grails.AssetProcessorService.getResolvedAssetPath(AssetProcessorService.groovy:57)
at asset.pipeline.grails.AssetProcessorService.asset(AssetProcessorService.groovy:72)
at asset.pipeline.grails.CachingLinkGenerator.asset(CachingLinkGenerator.groovy:32)
at asset.pipeline.grails.CachingLinkGenerator.resource(CachingLinkGenerator.groovy:24)
at gsp_weceem_layoutsweceemadmin_gsp$_run_closure1.doCall(gsp_weceem_layoutsweceemadmin_gsp.groovy:29)
at gsp_weceem_layoutsweceemadmin_gsp.run(gsp_weceem_layoutsweceemadmin_gsp.groovy:59)
... 8 more
该项目的源代码可以在https://bitbucket.org/ddmore/jummp/branch/upgradingGrails2x中找到。我也发现了我们社区中类似的问题，例如Grails deploy tomcat - Error applying layout或Error 500: Error processing GroovyPageView: null。但是，由于根本原因不同，它们都无法帮助我解决问题。
到目前为止，您是否遇到过这样的事件？请给我一个主意。