#531: when the plugin is executed in eclipse the session.getProjectDependencyGraph() might be null. Although the plugin is executed with maven's plugin prefix resolution ('pl.project13.maven:git-commit-id-plugin:4.0.1:revision:basepom.default:initialize') this seems to make it impossible to find out if this plugin was executed before. As a result it this patch might defeat the point of 'runOnlyOnce'.

Author: TheSnoozer

maven/src/main/java/pl/project13/maven/git/GitCommitIdMojo.java

@@ -438,7 +438,13 @@ public void execute() throws MojoExecutionException {
       }
 
       if (runOnlyOnce) {
-        List<MavenProject> sortedProjects = session.getProjectDependencyGraph().getSortedProjects();
+        List<MavenProject> sortedProjects =
+                Optional.ofNullable(session.getProjectDependencyGraph())
+                        .map(graph -> graph.getSortedProjects())
+                        .orElseGet(() -> {
+                          log.warn("Maven's dependency graph is null. Assuming project is the only one executed.");
+                          return Collections.singletonList(session.getCurrentProject());
+                        });
         MavenProject firstProject = sortedProjects.stream()
                 // skipPoms == true => find first project that is not pom project
                 .filter(p -> {