During upgrade some errors appear in the catalina.out and atlassian-confluence.log logs and section Manage Apps won't work:
catalina.out
com.sun.jersey.core.spi.component.ProviderFactory.__getComponentProvider The provider class, class com.sun.jersey.json.impl.provider.entity.JSONObjectProvider, could not be instantiated. Processing will continue but the class will not be utilized
java.lang.IllegalAccessException: class com.sun.jersey.core.spi.component.ComponentConstructor cannot access a member of class com.sun.jersey.json.impl.provider.entity.JSONObjectProvider with modifiers ""
at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:361)
at java.base/jdk.internal.reflect.Reflection.ensureMemberAccess(Reflection.java:99)
at java.base/java.lang.Class.newInstance(Class.java:579)
........
atlassian-confluence.log
io.atlassian.util.concurrent.LazyReference$InitializationException: com.sun.jersey.api.container.ContainerException: No WebApplication provider is present
at io.atlassian.util.concurrent.LazyReference.getInterruptibly(LazyReference.java:156)
at io.atlassian.util.concurrent.LazyReference.get(LazyReference.java:116)
at com.atlassian.plugin.servlet.DefaultServletModuleManager.getInstance(DefaultServletModuleManager.java:431)
at com.atlassian.plugin.servlet.DefaultServletModuleManager.getFilter(DefaultServletModuleManager.java:424)
at com.atlassian.plugin.servlet.DefaultServletModuleManager.getFilters(DefaultServletModuleManager.java:289)
at com.atlassian.plugins.rest.module.servlet.DefaultRestServletModuleManager.getFilters(DefaultRestServletModuleManager.java:125)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:54)
at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:44)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57)
at com.atlassian.plugins.rest.module.servlet.RestServletUtilsUpdaterFilter.doFilterInternal(RestServletUtilsUpdaterFilter.java:23)
at com.atlassian.plugins.rest.module.servlet.RestServletUtilsUpdaterFilter.doFilter(RestServletUtilsUpdaterFilter.java:35)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57)
at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24)
....................
