HTTP Status 500 – Internal Server Error Type Exception Report Message Request processing failed; nested exception is java.lang.IllegalStateException: java.io.FileNotFoundException: /opt/tomcat/webapps/ROOT/WEB-INF/lib/javax.activation-api-1.2.0.jar (Too many open files) Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: java.io.FileNotFoundException: /opt/tomcat/webapps/ROOT/WEB-INF/lib/javax.activation-api-1.2.0.jar (Too many open files) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1013) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) javax.servlet.http.HttpServlet.service(HttpServlet.java:626) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.boot.web.servlet.support.ErrorPageFilter.forwardToErrorPage(ErrorPageFilter.java:197) org.springframework.boot.web.servlet.support.ErrorPageFilter.handleException(ErrorPageFilter.java:180) org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:145) org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66) org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:105) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:123) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) Root Cause java.lang.IllegalStateException: java.io.FileNotFoundException: /opt/tomcat/webapps/ROOT/WEB-INF/lib/javax.activation-api-1.2.0.jar (Too many open files) org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:100) org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:257) org.apache.catalina.webresources.StandardRoot.getResourceInternal(StandardRoot.java:280) org.apache.catalina.webresources.CachedResource.validateResource(CachedResource.java:128) org.apache.catalina.webresources.Cache.getResource(Cache.java:69) org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:215) org.apache.catalina.webresources.StandardRoot.getClassLoaderResource(StandardRoot.java:224) org.apache.catalina.loader.WebappClassLoaderBase.findResource(WebappClassLoaderBase.java:943) org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1064) java.lang.ClassLoader.getResource(ClassLoader.java:1084) java.lang.ClassLoader.getResource(ClassLoader.java:1084) org.springframework.web.servlet.view.groovy.GroovyMarkupConfigurer.resolveTemplate(GroovyMarkupConfigurer.java:197) org.springframework.web.servlet.view.groovy.GroovyMarkupConfigurer$LocaleTemplateResolver.resolveTemplate(GroovyMarkupConfigurer.java:228) groovy.text.markup.MarkupTemplateEngine.resolveTemplate(MarkupTemplateEngine.java:198) org.springframework.web.servlet.view.groovy.GroovyMarkupView.checkResource(GroovyMarkupView.java:106) org.springframework.web.servlet.view.UrlBasedViewResolver.loadView(UrlBasedViewResolver.java:530) org.springframework.web.servlet.view.AbstractCachingViewResolver.createView(AbstractCachingViewResolver.java:250) org.springframework.web.servlet.view.UrlBasedViewResolver.createView(UrlBasedViewResolver.java:493) org.springframework.web.servlet.view.AbstractCachingViewResolver.resolveViewName(AbstractCachingViewResolver.java:149) org.springframework.web.servlet.view.ContentNegotiatingViewResolver.getCandidateViews(ContentNegotiatingViewResolver.java:309) org.springframework.web.servlet.view.ContentNegotiatingViewResolver.resolveViewName(ContentNegotiatingViewResolver.java:227) org.springframework.web.servlet.DispatcherServlet.resolveViewName(DispatcherServlet.java:1411) org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1347) org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) javax.servlet.http.HttpServlet.service(HttpServlet.java:626) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.boot.web.servlet.support.ErrorPageFilter.forwardToErrorPage(ErrorPageFilter.java:197) org.springframework.boot.web.servlet.support.ErrorPageFilter.handleException(ErrorPageFilter.java:180) org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:145) org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66) org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:105) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:123) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) Root Cause java.io.FileNotFoundException: /opt/tomcat/webapps/ROOT/WEB-INF/lib/javax.activation-api-1.2.0.jar (Too many open files) java.util.zip.ZipFile.open(Native Method) java.util.zip.ZipFile.(ZipFile.java:225) java.util.zip.ZipFile.(ZipFile.java:155) java.util.jar.JarFile.(JarFile.java:166) java.util.jar.JarFile.(JarFile.java:130) org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:202) org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:187) org.apache.catalina.webresources.AbstractArchiveResourceSet.openJarFile(AbstractArchiveResourceSet.java:308) org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:96) org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:257) org.apache.catalina.webresources.StandardRoot.getResourceInternal(StandardRoot.java:280) org.apache.catalina.webresources.CachedResource.validateResource(CachedResource.java:128) org.apache.catalina.webresources.Cache.getResource(Cache.java:69) org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:215) org.apache.catalina.webresources.StandardRoot.getClassLoaderResource(StandardRoot.java:224) org.apache.catalina.loader.WebappClassLoaderBase.findResource(WebappClassLoaderBase.java:943) org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1064) java.lang.ClassLoader.getResource(ClassLoader.java:1084) java.lang.ClassLoader.getResource(ClassLoader.java:1084) org.springframework.web.servlet.view.groovy.GroovyMarkupConfigurer.resolveTemplate(GroovyMarkupConfigurer.java:197) org.springframework.web.servlet.view.groovy.GroovyMarkupConfigurer$LocaleTemplateResolver.resolveTemplate(GroovyMarkupConfigurer.java:228) groovy.text.markup.MarkupTemplateEngine.resolveTemplate(MarkupTemplateEngine.java:198) org.springframework.web.servlet.view.groovy.GroovyMarkupView.checkResource(GroovyMarkupView.java:106) org.springframework.web.servlet.view.UrlBasedViewResolver.loadView(UrlBasedViewResolver.java:530) org.springframework.web.servlet.view.AbstractCachingViewResolver.createView(AbstractCachingViewResolver.java:250) org.springframework.web.servlet.view.UrlBasedViewResolver.createView(UrlBasedViewResolver.java:493) org.springframework.web.servlet.view.AbstractCachingViewResolver.resolveViewName(AbstractCachingViewResolver.java:149) org.springframework.web.servlet.view.ContentNegotiatingViewResolver.getCandidateViews(ContentNegotiatingViewResolver.java:309) org.springframework.web.servlet.view.ContentNegotiatingViewResolver.resolveViewName(ContentNegotiatingViewResolver.java:227) org.springframework.web.servlet.DispatcherServlet.resolveViewName(DispatcherServlet.java:1411) org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1347) org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) javax.servlet.http.HttpServlet.service(HttpServlet.java:626) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.boot.web.servlet.support.ErrorPageFilter.forwardToErrorPage(ErrorPageFilter.java:197) org.springframework.boot.web.servlet.support.ErrorPageFilter.handleException(ErrorPageFilter.java:180) org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:145) org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66) org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:105) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:123) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) Note The full stack trace of the root cause is available in the server logs. Apache Tomcat/8.5.63