Jetty12 with nxmc-6.2.4.war | NoClassDefFoundError: javax/servlet

[Tucson]

Hi,

I'm trying to upgrade from 6.2.1 to 6.2.4
While the upgrade of the applications seems to ok, the webserver can't deploy the war-file.

Shouldn't jakarta be referenced instead of javax?

java -jar /opt/jetty-home-12.0.39/start.jar --list-module

Enabled Modules:
----------------
  0) alpn-java                 transitive provider of alpn-impl for alpn
  1) resources                 transitive provider of resources for logging-logback
  2) logging/slf4j             dynamic dependency of logging-logback
                               transitive provider of logging/slf4j for logging-logback
  3) logging-logback           ${jetty.base}/start.d/logging-logback.ini
  4) bytebufferpool            transitive provider of bytebufferpool for server
                               ini template available with --add-modules=bytebufferpool
  5) threadpool                transitive provider of threadpool for server
                               ini template available with --add-modules=threadpool
  6) server                    ${jetty.base}/start.d/server.ini
  7) ssl                       ${jetty.base}/start.d/ssl.ini
  8) alpn                      transitive provider of alpn for http2
                               ini template available with --add-modules=alpn
  9) client                    transitive provider of client for websocket-core-client
 10) deploy                    transitive provider of deploy for ee10-deploy
 11) sessions                  transitive provider of sessions for ee10-servlet
                               ini template available with --add-modules=sessions
 12) ee10-servlet              transitive provider of ee10-servlet for ee10-webapp
                               transitive provider of ee10-servlet for ee10-security
 13) security                  transitive provider of security for ee10-security
 14) ee10-security             transitive provider of ee10-security for ee10-webapp
                               transitive provider of ee10-security for ee10-plus
 15) ee-webapp                 transitive provider of ee-webapp for ee10-webapp
                               ini template available with --add-modules=ee-webapp
 16) ee10-webapp               transitive provider of ee10-webapp for ee10-plus
                               transitive provider of ee10-webapp for ee10-deploy
                               ini template available with --add-modules=ee10-webapp
 17) plus                      ${jetty.base}/start.d/plus.ini
 18) jndi                      transitive provider of jndi for ee10-plus
 19) ee10-plus                 transitive provider of ee10-plus for ee10-annotations
 20) ee10-annotations          transitive provider of ee10-annotations for ee10-websocket-jetty
                               transitive provider of ee10-annotations for ee10-websocket-jakarta
 21) ee10-deploy               ${jetty.base}/start.d/ee10-deploy.ini
 22) websocket-core-client     transitive provider of websocket-core-client for ee10-websocket-jakarta
 23) websocket-core-server     transitive provider of websocket-core-server for websocket-jetty
                               transitive provider of websocket-core-server for ee10-websocket-jakarta
 24) ee10-websocket-jakarta    ${jetty.base}/start.d/ee10-websocket-jakarta.ini
 25) websocket-jetty           transitive provider of websocket-jetty for ee10-websocket-jetty
 26) ee10-websocket-jetty      ${jetty.base}/start.d/ee10-websocket-jetty.ini
 27) gzip                      ${jetty.base}/start.d/gzip.ini
 28) http                      ${jetty.base}/start.d/http.ini
 29) http2                     ${jetty.base}/start.d/http2.ini
 30) https                     ${jetty.base}/start.d/https.ini
 31) work                      ${jetty.base}/start.d/work.ini

journalctl jetty.service:

Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.348:INFO :oejs.Server:main: jetty-12.0.39; built: 2026-09-04T08:12:14.620Z; git: 23f845b712e7ab5aa7cee1bdec31fadd308b0fd8; jvm 19.0.2+7-Ubuntu-0ubuntu322.04
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.369:INFO :oejdp.ScanningAppProvider:main: Deployment monitor ee10 in [file:///usr/share/jetty-base/webapps/] at intervals 0s
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.374:INFO :oejd.DeploymentManager:main: addApp: App@4ef37659[ee10,null,/usr/share/jetty-base/webapps/nxmc-6.2.4.war]
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.547:INFO :oejew.StandardDescriptorProcessor:main: NO JSP Support for /nxmc-6.2.4, did not find org.eclipse.jetty.ee10.jsp.JettyJspServlet
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.559:INFO :oejsh.ContextHandler:main: Started oeje10w.WebAppContext@3e44f2a5{NetXMS REST API,/nxmc-6.2.4,b=file:///tmp/jetty-0_0_0_0-8080-nxmc-6_2_4_war-_nxmc-6_2_4-any
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.570:WARN :oejew.WebAppContext:main: Failed startup of context oeje10w.WebAppContext@3e44f2a5{NetXMS REST API,/nxmc-6.2.4,b=file:///tmp/jetty-0_0_0_0-8080-nxmc-6_2_4_war-_nxmc-6_2_4-any-4-4077838918963996153/webapp/,a=AVAILABLE,h=oeje10s.SessionHandler@295cf707{STARTED}}{/usr/share/jetty-base/webapps/nxmc-6.2.4.war}
Sep 08 12:27:23 <servername> java[259854]: java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
<- content cut due to character limit ->
Sep 08 12:27:23 <servername> java[259854]:    at org.eclipse.jetty.start.Main.main(Main.java:82)
Sep 08 12:27:23 <servername> java[259854]: Caused by:
Sep 08 12:27:23 <servername> java[259854]: java.lang.ClassNotFoundException: javax.servlet.http.HttpServlet
<- content cut due to character limit ->
Sep 08 12:27:23 <servername> java[259854]:    at org.eclipse.jetty.start.Main.main(Main.java:82)
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.572:INFO :oejdp.ScanningAppProvider:main: Deployment monitor ee8 in [file:///usr/share/jetty-base/webapps/] at intervals 0s
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.573:INFO :oejs.DefaultSessionIdManager:main: Session workerName=node0
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.580:INFO :oejs.AbstractConnector:main: Started ServerConnector@400fd762{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
Sep 08 12:27:23 <servername> java[259854]: 2026-09-08 12:27:23.587:INFO :oejs.Server:main: Started oejs.Server@23348b5d{STARTING}[12.0.39,sto=0] @934ms

[alk]

Hi,

nxmc is already jakarta — it's built against jakarta.servlet-api 6.0 and its web.xml declares Jakarta EE 10, so ee10 in your setup is correct. What's failing is that the file you deployed as nxmc-6.2.4.war is not the web UI, it's the Legacy Web API war (netxms-websvc). That one is still javax/EE8 and under ee10 it fails exactly like this.

Two things in your log point at it: the missing class is javax/servlet/http/HttpServlet, which nxmc has no reference to at all, and the context starts as "NetXMS REST API" — that display name comes from the API war's web.xml, the web UI war has no display name.

Check with:

unzip -p /usr/share/jetty-base/webapps/nxmc-6.2.4.war WEB-INF/web.xml | head -8

The web UI war has xmlns="https://jakarta.ee/xml/ns/jakartaee" and version="6.0". What you have will show <display-name>NetXMS REST API</display-name> and version="2.4".

Re-download nxmc-6.2.4.war from the Web Interface Binaries section — the two files sit next to each other there — and it deploys into your existing ee10 setup unchanged.

[Tucson]

Hello Alex,

you are right. My mistake was that I downloaded the wrong file, now it works as expected.

Thank you