Ok, I tried your base schema and doc contribs on a test 5.6 system and they worked.

schema file:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
           targetNamespace="http://nuxeo.com/schemas/com/nuxeo/myproject/metadata/extra/"
           xmlns:extra="http://nuxeo.com/schemas/com/nuxeo/myproject/metadata/extra/">

    <xs:element name="test1" type="xs:string" />
    <xs:element name="test2" type="xs:string" />
</xs:schema>

And the schema/doc contrib:

<?xml version="1.0" encoding="UTF-8"?>
<component name="test">

    <require>org.nuxeo.ecm.directory.types</require>
    <require>org.nuxeo.runtime.started</require>

    <extension target="org.nuxeo.ecm.core.schema.TypeService" point="schema">
        <schema name="extra" src="data/schemas/extra.xsd" prefix="extra" />
    </extension>

    <extension target="org.nuxeo.ecm.core.schema.TypeService" point="doctype">
        <doctype name="File" extends="Document">
            <schema name="common" />
            <schema name="uid" />
            <schema name="dublincore" />
            <schema name="file" />
            <schema name="files" />
            <schema name="extra" />
            <facet name="Versionable" />
        </doctype>
    </extension>

</component>

I had to remove the “file_schema” schema because I dont have that defined. I created a new File doc and confirmed in Postgres that the extra table is created. So if your contribs look like those above then they are not the issue.

I haven't followed either of these examples but I customize File on almost every Nuxeo project so I know that customizing File does work. Do you see any useful errors in the server startup log? Have you turned on additional startup logging (in Nuxeo server in the lib/log4j.xml file uncomment the following… [had to create this as an answer because the XML wouldn't show up in Comment]

  <!-- Uncomment for fragments pre-processing -->
  <!--
  <category name="org.nuxeo.runtime.deployment.preprocessor">
    <priority value="INFO" />
  </category>
  -->

and

  <!-- Uncomment for components registration info -->
  <!--
  <category name="org.nuxeo.runtime.model.impl">
    <priority value="INFO" />
  </category>
  -->

Try adding a

<?xml version="1.0"?>
<component name="com.concena.test.doctypes.contrib">

    <require>org.nuxeo.runtime.started</require>
    <extension target="....

Ok, confirm that now works for me! So thank you for your time, you are my guru now! :)

I don't know why but i think that in the last part of my test i have missed the “files” schema and all other works broke against this problem. In the meanwhile i have decided to create another File Type but, in my latest test, i have tried to extend “File” (based on my first question) and all works fine :) So:

1. Duble check every time that all core schema are imported
2. Enable extra logging
3. Enable
4. When you have an exception like this, you miss something [1]
5. Bruce is always right :)

Thank you!

[1]

Caused by: org.nuxeo.ecm.core.api.WrappedException: Exception: java.lang.NullPointerException. message: null
            at org.nuxeo.ecm.core.api.impl.DataModelImpl.getSchema(DataModelImpl.java:86)
            at org.nuxeo.ecm.core.api.impl.DocumentModelImpl.addDataModel(DocumentModelImpl.java:569)