In order to avoid error stacktraces such as

[ERROR] Missing child element at null:56:60

instead of doing

configuration = new DefaultConfigurationBuilder().build(is);

We must use :

// configPath is src.getURI(), of file.getPath(), etc.
configuration = new DefaultConfigurationBuilder().build(is, configPath);

Then it will generate the following errors :

[ERROR] Missing child element at /webapp/WEB-INF/search/formation.xml:56:60

It will be very useful to search and find where the error occured.
Search "DefaultConfigurationBuilder" in Eclipse for all "*.java" files to resolve this issue.

You can see examples :

• in PluginsManager:1335
• RuntimeServlet:400
• SkinTagProvider:154
• etc.

See also dev meeting of 2017-05-15, page 8