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For convenience, a complete pom.xml is attached. The important parts are briefly explained in the comments.
The last parameter of the configuration block 'requiresRestart' of the configuration block is particularly important in order to protect your users from a confusing error. It defines if SNAP asks for a restart after plugin installation. If this parameter is 'false' and no SNAP restart is done the user will run into an error when trying to launch the operator.
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