Tycho build fails with "No content specified for p2 repository" although there is a category.xml

Question

The Eclipse plug-in Markdown-Editor doesn't build with Maven/Tycho. The build fails with the message

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-p2-repository-plugin:0.18.1:assemble-repository (default-assemble-repository)
 on project markdown.editor.site: No content specified for p2 repository -> [Help 1]

The similar configuration StartExplorer plugin works fine:

category.xml:

<?xml version="1.0" encoding="UTF-8"?>
<site>
   <feature url="features/markdown.editor.feature_1.0.0.jar" id="markdown.editor.feature" version="1.0.0">
      <category name="markdowneditor"/>
   </feature>
   <category-def name="markdowneditor" label="Markdown Editor">
      <description>
         Extend the text editor to provide good Markdown support.
      </description>
   </category-def>
</site>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
    xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.winterwell.markdown</groupId>
        <artifactId>markdown.editor.parent</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>

    <artifactId>markdown.editor.site</artifactId>
    <packaging>eclipse-repository</packaging>

    <name>Markdown Editor (site)</name>
    <description>Markdown Editor (site)</description>

</project>

Related to tycho-p2-repository-plugin fails with "No content specified for p2 repository"
and How to correctly specify eclipse-plugins in category.xml of tycho eclipse-repository?

Answer 1

If version is defined with -SNAPSHOT``, then incategory.xmlversion should have.qualifier`

<feature url="features/markdown.editor.feature_1.0.0.jar" id="markdown.editor.feature" version="1.0.0.qualifier">