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ical export failing when ical import is disabled

Description

Upgrading to Sakai 19.4 broke ical exporting (opaque url) in our test instance, with the following stacktrace:

11-juin-2020 10:29:49.361 WARN [ajp-nio-8010-exec-17] org.sakaiproject.access.tool.AccessServlet.dispatch dispatch(): exception: java.lang.RuntimeException: Error loading default cache implementation. Please ensure the JCache API dependency is included in the classpath, or override the cache implementation (e.g. via configuration: net.fortuna.ical4j.timezone.cache.impl=net.fortuna.ical4j.util.MapTimeZoneCache) at net.fortuna.ical4j.model.TimeZoneLoader.lambda$cacheInit$1(TimeZoneLoader.java:285) at java.util.Optional.orElseGet(Optional.java:267) at net.fortuna.ical4j.model.TimeZoneLoader.cacheInit(TimeZoneLoader.java:281) at net.fortuna.ical4j.model.TimeZoneLoader.<init>(TimeZoneLoader.java:85) at net.fortuna.ical4j.model.TimeZoneRegistryImpl.<init>(TimeZoneRegistryImpl.java:125) at net.fortuna.ical4j.model.TimeZoneRegistryImpl.<init>(TimeZoneRegistryImpl.java:116) at net.fortuna.ical4j.model.DefaultTimeZoneRegistryFactory.createRegistry(DefaultTimeZoneRegistryFactory.java:48) at org.sakaiproject.calendar.impl.BaseCalendarService.printICalSchedule(BaseCalendarService.java:5478) at org.sakaiproject.calendar.impl.BaseCalendarService.handleAccessIcalCommon(BaseCalendarService.java:5850) at org.sakaiproject.calendar.impl.BaseCalendarService.handleAccessOpaqueUrl(BaseCalendarService.java:5939) at org.sakaiproject.calendar.impl.BaseCalendarService$1.handleAccess(BaseCalendarService.java:1338) at org.sakaiproject.access.tool.AccessServlet.dispatch(AccessServlet.java:346) at org.sakaiproject.access.tool.AccessServlet.doGet(AccessServlet.java:192) at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) at org.sakaiproject.vm.ComponentServlet.service(ComponentServlet.java:56) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.sakaiproject.oauth.filter.OAuthPostFilter.doFilter(OAuthPostFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:475) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.sakaiproject.oauth.filter.OAuthPreFilter.doFilter(OAuthPreFilter.java:74) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:394) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NoClassDefFoundError: javax/cache/configuration/Configuration at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at net.fortuna.ical4j.model.TimeZoneLoader.lambda$cacheInit$1(TimeZoneLoader.java:283) ... 46 more Caused by: java.lang.ClassNotFoundException: javax.cache.configuration.Configuration at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 49 more

I found the same error mentioned in SAK-42232, with the fix being adding the following line to the constructor for the IcalendarReader.java :

System.setProperty("net.fortuna.ical4j.timezone.cache.impl", MapTimeZoneCache.class.getName());

Since we have "calendar.external.subscriptions.enable" set to false in sakai.properties, I assume that class is never instantiated and the property is never set.

I think that line should be moved somewhere else, perhaps the BaseCalendarService init() method?

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Created June 11, 2020 at 1:26 PM
Updated June 23, 2020 at 10:12 AM
Resolved June 23, 2020 at 10:12 AM

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