Somewhat related - I just encountered it today. During second start of Tigase:

2016-09-23 15:02:44.283 [main]             ConfigHolder.loadConfiguration()   SEVERE:   could not replace configuration file with file in DSL format
java.nio.file.FileAlreadyExistsException: etc/init.properties.old
	at sun.nio.fs.UnixCopyFile.move(UnixCopyFile.java:429)
	at sun.nio.fs.UnixFileSystemProvider.move(UnixFileSystemProvider.java:262)

I removed any existing hardcoded references to etc/init.properties file with exception of one used when there is no --properties-file parameter.

I also added code to remove existing old file if one exists and to I'm using name of config file passed as parameter with .old suffix as a backup file for converted configuration.

+Note:+ It is possible to pass more than one property file as config file in Tigase XMPP Server 7.1.0 and earlier. Now however it is not supported in Tigase XMPP Server 7.2.0-SNAPSHOT, so configuration will be loaded from multiple property files, converted to DSL and store under name of first configuration file.

Andrzej Wójcik wrote:

I removed any existing hardcoded references to etc/init.properties file with exception of one used when there is no --properties-file parameter.

Works correctly now.

I also added code to remove existing old file if one exists and to I'm using name of config file passed as parameter with .old suffix as a backup file for converted configuration.

This works as well. However:

• I would add a log entry to the tigase-console.log file that such conversion was performed, what was changed and where files were moved;

• I'm not sure if in-place replacing is good - I would lean towards saving converted configuration to @.new@, leave old file as-is (and also print log entry with information).

I added warning message