Fessで404のトラブルシューティング相談

Fessのサービスを再起動したところ、404エラーが表示され、ログとして以下のエラーが出力されました。

エラーを取り除くためになにをすればいいのかが分かっておらず、
トラブルシュートのヒントをいただきたいです。

Dec 14 07:59:13 localhost.localdomain systemd[1]: Started Fess.
-- Subject: Unit fess.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit fess.service has finished starting up.
-- 
-- The start-up result is done.
Dec 14 07:59:19 localhost.localdomain fess[11291]: org.lastaflute.di.exception.ContainerInitFailureException: Look! Read the message below.
Dec 14 07:59:19 localhost.localdomain fess[11291]: /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Dec 14 07:59:19 localhost.localdomain fess[11291]: Failed to initialize the container.
Dec 14 07:59:19 localhost.localdomain fess[11291]: [Path]
Dec 14 07:59:19 localhost.localdomain fess[11291]: smart/cooldeploy-autoregister.xml
Dec 14 07:59:19 localhost.localdomain fess[11291]: [Namespace]
Dec 14 07:59:19 localhost.localdomain fess[11291]: null
Dec 14 07:59:19 localhost.localdomain fess[11291]: [Included by]
Dec 14 07:59:19 localhost.localdomain fess[11291]: file:/usr/share/fess/app/WEB-INF/classes/fess_sso++.xml
Dec 14 07:59:19 localhost.localdomain fess[11291]: fess_sso.xml
Dec 14 07:59:19 localhost.localdomain fess[11291]: * * * * * * * * * */
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.throwContainerInitFailureException(LaContainerImpl.java:463)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.init(LaContainerImpl.java:415)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.doInit(LaContainerImpl.java:431)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.init(LaContainerImpl.java:413)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.doInit(LaContainerImpl.java:431)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.init(LaContainerImpl.java:413)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.factory.SingletonLaContainerFactory.init(SingletonLaContainerFactory.java:66)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.web.container.WebLastaContainerInitializer.doInitContainer(WebLastaContainerInitializer.java:81)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.web.container.WebLastaContainerInitializer.initialize(WebLastaContainerInitializer.java:45)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.web.servlet.filter.LastaPrepareFilter.initializeContainer(LastaPrepareFilter.java:137)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.web.servlet.filter.LastaPrepareFilter.init(LastaPrepareFilter.java:94)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:270)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:251)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:102)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4536)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.startup.Tomcat.start(Tomcat.java:468)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.dbflute.tomcat.TomcatBoot.startServer(TomcatBoot.java:713)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.dbflute.tomcat.TomcatBoot.go(TomcatBoot.java:402)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.dbflute.tomcat.TomcatBoot.bootAwait(TomcatBoot.java:347)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.codelibs.fess.FessBoot.main(FessBoot.java:94)
Dec 14 07:59:19 localhost.localdomain fess[11291]: Caused by: java.lang.NoClassDefFoundError: org/codelibs/fess/app/job/AllJobScheduler (wrong name: org/codelibs/fess/app/job/AllJobScheduler 2)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.lang.ClassLoader.defineClass1(Native Method)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2418)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:865)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1334)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.lang.Class.forName0(Native Method)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.lang.Class.forName(Class.java:398)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.util.LdiClassUtil.forName(LdiClassUtil.java:80)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.smart.cool.CoolComponentAutoRegister.processClass(CoolComponentAutoRegister.java:80)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.util.ClassTraversal.traverseFileSystem(ClassTraversal.java:105)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.util.ClassTraversal.traverseFileSystem(ClassTraversal.java:102)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.util.ClassTraversal.forEach(ClassTraversal.java:45)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.util.LdiResourcesUtil$FileSystemResources.forEach(LdiResourcesUtil.java:184)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.smart.cool.CoolComponentAutoRegister.registerAll(CoolComponentAutoRegister.java:60)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at java.base/java.lang.reflect.Method.invoke(Method.java:566)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.util.LdiMethodUtil.invoke(LdiMethodUtil.java:49)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.assembler.AbstractMethodAssembler.invoke(AbstractMethodAssembler.java:83)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.assembler.DefaultInitMethodAssembler.assemble(DefaultInitMethodAssembler.java:40)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.deployer.SingletonComponentDeployer.assemble(SingletonComponentDeployer.java:57)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.deployer.SingletonComponentDeployer.deploy(SingletonComponentDeployer.java:41)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.deployer.SingletonComponentDeployer.init(SingletonComponentDeployer.java:35)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.ComponentDefImpl.init(ComponentDefImpl.java:85)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.doInit(LaContainerImpl.java:434)
Dec 14 07:59:19 localhost.localdomain fess[11291]: at org.lastaflute.di.core.meta.impl.LaContainerImpl.init(LaContainerImpl.java:413)
Dec 14 07:59:19 localhost.localdomain fess[11291]: ... 40 more
Dec 14 07:59:20 localhost.localdomain fess[11291]: WARNING: An illegal reflective access operation has occurred
Dec 14 07:59:20 localhost.localdomain fess[11291]: WARNING: Illegal reflective access by org.apache.catalina.loader.WebappClassLoaderBase (file:/usr/share/fess/lib/classes/) to field java.io.ObjectStreamClass$Caches.localDescs
Dec 14 07:59:20 localhost.localdomain fess[11291]: WARNING: Please consider reporting this to the maintainers of org.apache.catalina.loader.WebappClassLoaderBase
Dec 14 07:59:20 localhost.localdomain fess[11291]: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
Dec 14 07:59:20 localhost.localdomain fess[11291]: WARNING: All illegal access operations will be denied in a future release

Fessのバージョンは13.7です。
ログは journalctl -f で取得しました。
その他に情報が必要であれば、ご指示いただければ共有させていただきます。

Java 11を利用しているでしょうか?

返答が遅くなってしまい大変失礼致しました。

はい、Java 11を利用しております。

$ java -version
openjdk version "11.0.8" 2020-07-14 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.8+10-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.8+10-LTS, mixed mode, sharing)

Javaのバージョンが違うのではないかなと言う気もするので、systemdが参照しているJavaのバージョンを確認していただくの良いかと思います。あとは、fess.logかserver.logにもログが出ていそうな気もします。