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The default plugin goal is Post-site, however there are several reports at this step, and some reports are executed after the plugin replacement. This is a know problem in Maven when trying to explicitly indicate the execution order.
We strongly recommend to execute the plugin independently after the site creation, and not just as part of the site phase. We mean, instead of execute mvn site site:deploy , you should executed something like mvn site net.sf.mgaip:mgaip:insert site:deploy .
The link has an ampersand to pass several attributes to the WebService. However, this word is parsed as a xml internal code, and it says that a semi-colon is missing. The only possibility is to erase the last parameter, and just past the group_id.
The last will show only the logo in white.