OpenDJ server starting but throwing a ClassCastException - need to resolve?

[aredotjava]

Version: OpenDJ Server 4.6.2
Java Version: 18.0.2-ea

My OpenDJ server is starting, but throwing a java exception on start-up. I'm wondering how to resolve this, if needed:

[23/Jan/2024:11:39:18 -0500] category=CONFIG severity=ERROR msgID=116 msg=An error occurred while trying to initialize a backend loaded from class org.opends.server.backends.MonitorBackend with the information in configuration entry ds-cfg-backend-id=userRoot,cn=Backends,cn=config: ClassCastException: class org.forgerock.opendj.server.config.meta.LocalBackendCfgDefn$LocalBackendCfgServerImpl cannot be cast to class org.forgerock.opendj.server.config.server.MonitorBackendCfg (org.forgerock.opendj.server.config.meta.LocalBackendCfgDefn$LocalBackendCfgServerImpl and org.forgerock.opendj.server.config.server.MonitorBackendCfg are in unnamed module of loader 'app') (MonitorBackend.java:88 BackendConfigManager.java:1062 BackendConfigManager.java:1045 BackendConfigManager.java:275 BackendConfigManager.java:261 BackendConfigManager.java:249 DirectoryServer.java:1649 DirectoryServer.java:1474 DirectoryServer.java:5047). This backend will be disabled

Thanks!

[vharseko]

Please check in jdk 17

[aredotjava]

Same error with jdk 17:

[23/Jan/2024:15:13:18 -0500] category=CONFIG severity=ERROR msgID=116 msg=An error occurred while trying to initialize a backend loaded from class org.opends.server.backends.MonitorBackend with the information in configuration entry ds-cfg-backend-id=userRoot,cn=Backends,cn=config: ClassCastException: class org.forgerock.opendj.server.config.meta.LocalBackendCfgDefn$LocalBackendCfgServerImpl cannot be cast to class org.forgerock.opendj.server.config.server.MonitorBackendCfg (org.forgerock.opendj.server.config.meta.LocalBackendCfgDefn$LocalBackendCfgServerImpl and org.forgerock.opendj.server.config.server.MonitorBackendCfg are in unnamed module of loader 'app') (MonitorBackend.java:88 BackendConfigManager.java:1062 BackendConfigManager.java:1045 BackendConfigManager.java:275 BackendConfigManager.java:261 BackendConfigManager.java:249 DirectoryServer.java:1649 DirectoryServer.java:1474 DirectoryServer.java:5047). This backend will be disabled

Version: OpenDJ Server 4.6.2
Java Version: 17.0.9

[vharseko]

what are the steps to reproduce the error ?

[aredotjava]

I just start the server with start-ds.

[vharseko]

cannot reproduce, please check https://github.com/OpenIdentityPlatform/OpenDJ/actions/runs/7543244682/job/20533820422
Test on Unix / Test on Windows steps

$ wget https://github.com/OpenIdentityPlatform/OpenDJ/releases/download/4.6.2/opendj-4.6.2.zip

$ unzip opendj-4.6.2.zip 

$ export JAVA_HOME=`/usr/libexec/java_home -v17`

$ java -version
openjdk version "17.0.9" 2023-10-17
OpenJDK Runtime Environment Homebrew (build 17.0.9+0)

$ opendj/setup --addBaseEntry -h localhost -p 1389 --ldapsPort 1636 --adminConnectorPort 4444 --enableStartTLS --generateSelfSignedCertificate --rootUserDN "cn=Directory Manager" --rootUserPassword password --baseDN dc=example,dc=com --cli --acceptLicense --no-prompt

Configuring Directory Server ..... Done.
Configuring Certificates ..... Done.
Creating Base Entry dc=example,dc=com ..... Done.
Starting Directory Server ......... Done.

To see basic server configuration status and configuration, you can launch
/Users/vharseko/Downloads/opendj/bin/status

$ opendj/bin/stop-ds 
Stopping Server...
[25/янв./2024:10:56:55 +0300] category=PROTOCOL severity=NOTICE msgID=277 msg=Stopped listening for new connections on Administration Connector 0.0.0.0 port 4444
[25/янв./2024:10:56:55 +0300] category=PROTOCOL severity=NOTICE msgID=277 msg=Stopped listening for new connections on LDAPS Connection Handler 0.0.0.0 port 1636
[25/янв./2024:10:56:55 +0300] category=PROTOCOL severity=NOTICE msgID=277 msg=Stopped listening for new connections on LDAP Connection Handler 0.0.0.0 port 1389
[25/янв./2024:10:56:56 +0300] category=BACKEND severity=NOTICE msgID=370 msg=The backend userRoot is now taken offline
[25/янв./2024:10:56:56 +0300] category=CORE severity=NOTICE msgID=203 msg=The Directory Server is now stopped

$ opendj/bin/start-ds 
[25/янв./2024:10:57:03 +0300] category=CORE severity=NOTICE msgID=134 msg=OpenDJ Server 4.6.2 (build 20240117115119, revision number 1a9c8bd77610bb1baaef55874852e15eec72f516) starting up
[25/янв./2024:10:57:03 +0300] category=JVM severity=NOTICE msgID=21 msg=Installation Directory:  /Users/vharseko/Downloads/opendj
[25/янв./2024:10:57:03 +0300] category=JVM severity=NOTICE msgID=23 msg=Instance Directory:      /Users/vharseko/Downloads/opendj
[25/янв./2024:10:57:03 +0300] category=JVM severity=NOTICE msgID=17 msg=JVM Information: 17.0.9+0 by Homebrew, 64-bit architecture, 2147483648 bytes heap size
[25/янв./2024:10:57:03 +0300] category=JVM severity=NOTICE msgID=18 msg=JVM Host: localhost, running Mac OS X 14.2.1 x86_64, 8589934592 bytes physical memory size, number of processors available 8
[25/янв./2024:10:57:03 +0300] category=JVM severity=NOTICE msgID=19 msg=JVM Arguments: "--add-exports=java.base/sun.security.x509=ALL-UNNAMED", "--add-exports=java.base/sun.security.tools.keytool=ALL-UNNAMED", "-Dorg.opends.server.scriptName=start-ds"
[25/янв./2024:10:57:05 +0300] category=BACKEND severity=NOTICE msgID=513 msg=The database backend userRoot containing 1 entries has started
[25/янв./2024:10:57:05 +0300] category=EXTENSIONS severity=NOTICE msgID=221 msg=DIGEST-MD5 SASL mechanism using a server fully qualified domain name of: localhost
[25/янв./2024:10:57:05 +0300] category=CORE severity=NOTICE msgID=135 msg=The Directory Server has started successfully
[25/янв./2024:10:57:05 +0300] category=CORE severity=NOTICE msgID=139 msg=The Directory Server has sent an alert notification generated by class org.opends.server.core.DirectoryServer (alert type org.opends.server.DirectoryServerStarted, alert ID org.opends.messages.core-135): The Directory Server has started successfully
[25/янв./2024:10:57:06 +0300] category=PROTOCOL severity=NOTICE msgID=276 msg=Started listening for new connections on Administration Connector 0.0.0.0 port 4444
[25/янв./2024:10:57:06 +0300] category=PROTOCOL severity=NOTICE msgID=276 msg=Started listening for new connections on LDAP Connection Handler 0.0.0.0 port 1389
[25/янв./2024:10:57:06 +0300] category=PROTOCOL severity=NOTICE msgID=276 msg=Started listening for new connections on LDAPS Connection Handler 0.0.0.0 port 1636

[vharseko]

attach opendj folder before and after upgrade

[aredotjava]

Is there a specific file you're looking for? I'm not able to upload the entire folder due to confidentiality concerns.

[pabloisaak]

I'm facing a similar issue upgrading from openDS 3 to openDJ 4.9. Do you have any updates on this?

[aredotjava]

It's been a while since I resolved this, but I believe I ultimately had to start with a fresh install instead of going the upgrade route, then point to the original config files I needed to use.