Fix #358, #352 NPE on site generation caused by null returned by deprecated MavenProject.getDependencyArtifacts()

src/it/ISSUE-358/child-1/pom.xml

@@ -0,0 +1,11 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>net.tomred</groupId>
+    <artifactId>ISSUE-358</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+  </parent>
+  <artifactId>child-1</artifactId>
+</project>

src/it/ISSUE-358/invoker.properties

@@ -0,0 +1 @@
+invoker.goals=clean site

src/it/ISSUE-358/pom.xml

@@ -0,0 +1,44 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>net.tomred</groupId>
+  <artifactId>ISSUE-358</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+
+  <packaging>pom</packaging>
+
+  <modules>
+    <module>child-1</module>
+  </modules>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>license-maven-plugin</artifactId>
+        <version>@project.version@</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-site-plugin</artifactId>
+        <version>@maven-site-plugin.version@</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-project-info-reports-plugin</artifactId>
+        <version>@maven-project-info-reports-plugin.version@</version>
+      </plugin>
+    </plugins>
+  </build>
+
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>license-maven-plugin</artifactId>
+        <version>@project.version@</version>
+      </plugin>
+    </plugins>
+  </reporting>
+</project>

src/main/java/org/codehaus/mojo/license/AbstractThirdPartyReportMojo.java

@@ -482,10 +482,10 @@ Collection<ThirdPartyDetails> createThirdPartyDetails(MavenProject project, bool
         ResolvedProjectDependencies loadedDependencies;
         if (loadArtifacts) {
             loadedDependencies =
-                    new ResolvedProjectDependencies(project.getArtifacts(), project.getDependencyArtifacts());
+                    new ResolvedProjectDependencies(project.getArtifacts(), MojoHelper.getDependencyArtifacts(project));
         } else {
             loadedDependencies = new ResolvedProjectDependencies(
-                    getProject().getArtifacts(), getProject().getDependencyArtifacts());
+                    getProject().getArtifacts(), MojoHelper.getDependencyArtifacts(project));
         }
 
         ThirdPartyHelper thirdPartyHelper = new DefaultThirdPartyHelper(

src/main/java/org/codehaus/mojo/license/AddThirdPartyMojo.java

@@ -48,6 +48,7 @@
 import org.codehaus.mojo.license.api.ThirdPartyToolException;
 import org.codehaus.mojo.license.model.LicenseMap;
 import org.codehaus.mojo.license.utils.FileUtil;
+import org.codehaus.mojo.license.utils.MojoHelper;
 import org.codehaus.mojo.license.utils.SortedProperties;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -225,10 +226,10 @@ protected ResolvedProjectDependencies resolveDependencyArtifacts() throws Depend
         }
         if (isAggregatorBuild) {
             dependencyArtifacts =
-                    new ResolvedProjectDependencies(project.getArtifacts(), project.getDependencyArtifacts());
+                    new ResolvedProjectDependencies(project.getArtifacts(), MojoHelper.getDependencyArtifacts(project));
         } else {
             dependencyArtifacts =
-                    new ResolvedProjectDependencies(project.getArtifacts(), project.getDependencyArtifacts());
+                    new ResolvedProjectDependencies(project.getArtifacts(), MojoHelper.getDependencyArtifacts(project));
         }
         return dependencyArtifacts;
     }

src/main/java/org/codehaus/mojo/license/AggregateDownloadLicensesMojo.java

@@ -33,6 +33,7 @@
 import org.apache.maven.project.MavenProject;
 import org.codehaus.mojo.license.api.ResolvedProjectDependencies;
 import org.codehaus.mojo.license.download.LicensedArtifact;
+import org.codehaus.mojo.license.utils.MojoHelper;
 
 /**
  * Download the license files of all aggregated dependencies of the current project, and generate a summary file
@@ -116,7 +117,7 @@ protected Map<String, LicensedArtifact> getDependencies() {
 
         for (MavenProject p : reactorProjects) {
             licensedArtifactResolver.loadProjectDependencies(
-                    new ResolvedProjectDependencies(p.getArtifacts(), p.getDependencyArtifacts()),
+                    new ResolvedProjectDependencies(p.getArtifacts(), MojoHelper.getDependencyArtifacts(p)),
                     this,
                     remoteRepositories,
                     result);

src/main/java/org/codehaus/mojo/license/DownloadLicensesMojo.java

@@ -31,6 +31,7 @@
 import org.apache.maven.plugins.annotations.ResolutionScope;
 import org.codehaus.mojo.license.api.ResolvedProjectDependencies;
 import org.codehaus.mojo.license.download.LicensedArtifact;
+import org.codehaus.mojo.license.utils.MojoHelper;
 
 /**
  * Download the license files of all the current project's dependencies, and generate a summary file containing a list
@@ -84,7 +85,7 @@ protected boolean isSkip() {
     protected Map<String, LicensedArtifact> getDependencies() {
         final Map<String, LicensedArtifact> result = new TreeMap<>();
         licensedArtifactResolver.loadProjectDependencies(
-                new ResolvedProjectDependencies(project.getArtifacts(), project.getDependencyArtifacts()),
+                new ResolvedProjectDependencies(project.getArtifacts(), MojoHelper.getDependencyArtifacts(project)),
                 this,
                 remoteRepositories,
                 result);

src/main/java/org/codehaus/mojo/license/LicensesXmlInsertVersionsMojo.java

@@ -42,6 +42,7 @@
 import org.codehaus.mojo.license.download.LicensedArtifact;
 import org.codehaus.mojo.license.download.ProjectLicenseInfo;
 import org.codehaus.mojo.license.utils.FileUtil;
+import org.codehaus.mojo.license.utils.MojoHelper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -129,7 +130,7 @@ public ArtifactFilters getArtifactFilters() {
             };
             final Map<String, LicensedArtifact> resolvedDeps = new TreeMap<String, LicensedArtifact>();
             licensedArtifactResolver.loadProjectDependencies(
-                    new ResolvedProjectDependencies(project.getArtifacts(), project.getDependencyArtifacts()),
+                    new ResolvedProjectDependencies(project.getArtifacts(), MojoHelper.getDependencyArtifacts(project)),
                     config,
                     remoteRepositories,
                     resolvedDeps);

src/main/java/org/codehaus/mojo/license/utils/MojoHelper.java

@@ -27,13 +27,17 @@
 import java.net.URL;
 import java.text.MessageFormat;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
+import java.util.Set;
 
 import org.apache.commons.collections.comparators.ComparatorChain;
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.model.Resource;
 import org.apache.maven.project.MavenProject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Mojo helper methods.
@@ -42,6 +46,7 @@
  * @since 1.0
  */
 public class MojoHelper {
+    private static final Logger LOG = LoggerFactory.getLogger(MojoHelper.class);
 
     /**
      * Add the directory as a resource of the given project.
@@ -215,4 +220,25 @@ public static List<String> getParams(String params) {
         String[] split = params == null ? new String[0] : params.split(",");
         return Arrays.asList(split);
     }
+
+    /**
+     * {@link MavenProject#getDependencyArtifacts()} is deprecated.
+     *
+     * <p>
+     * This method checks if the dependency artifacts is {@code null} and returns an empty {@code HashSet} to avoid the
+     * {@code NullPointerException}s caused by the {@link MavenProject#getDependencyArtifacts()} returning {@code null}.
+     * </p>
+     *
+     * @param project the MavenProject to retrieve artifacts from
+     * @return a HashSet of dependencies or an empty set
+     */
+    public static Set<Artifact> getDependencyArtifacts(MavenProject project) {
+        if (project == null || project.getDependencyArtifacts() == null) {
+            LOG.warn("");
+            LOG.warn("Non-transitive dependencies cannot be found. ");
+            LOG.warn("");
+            return Collections.emptySet();
+        }
+        return project.getDependencyArtifacts();
+    }
 }