I'm currently trying to install a backup from our production Confluence to our testserver and got following problem: "Confluence will not start up because the build number in the home directory  is newer than the Confluence build number ."
Ok, I checked the documentation an it says to configure the system property
I went to the
<confluence-install>/bin/setenv.sh (using Linux here) and edited the first line to:
JAVA_OPTS=" -Xms256m -Xmx512m -XX:MaxPermSize=256m $JAVA_OPTS -Djava.awt.headless=true com.atlassian.confluence.allow.downgrade=true "
The log (catalina.out) tells me that the main class
com.atlassian.confluence.allow.downgrade=true couldn't been found.
If using Confluence 4.3.2 and above and you need to start Confluence with an upgraded home directory, you need to set the com.atlassian.confluence.allow.downgrade system property to true.
If using a version of Confluence older than 4.3.2, you can change your build number in <Confluence-Home>/confluence.cfg.xml file as:
That is the build number for Confluence v3.0.0_01. After it's corrected, restart Confluence.
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