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Rosjava log4j error

After not having used my rosjava nodes for a year or so I am now getting this error when I run a node,

log4j:WARN No appenders could be found for logger (org.ros.internal.node.client.Registrar).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See for more info.

I have searched fro a resolution but can’t find one. Manually configuring a properties file doesn’t help.

Any idea why I am getting this error?

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