Remove redundant/unneeded code

src/main/java/org/apache/maven/plugins/dependency/analyze/AbstractAnalyzeMojo.java

@@ -383,7 +383,7 @@ private boolean checkDependencies() throws MojoExecutionException {
             logDependencyWarning("Used undeclared dependencies found:");
 
             if (verbose) {
-                logArtifacts(usedUndeclaredWithClasses, true);
+                logArtifacts(usedUndeclaredWithClasses);
             } else {
                 logArtifacts(usedUndeclaredWithClasses.keySet(), true);
             }
@@ -464,24 +464,17 @@ private void logArtifacts(Set<Artifact> artifacts, boolean warn) {
         }
     }
 
-    private void logArtifacts(Map<Artifact, Set<String>> artifacts, boolean warn) {
+    private void logArtifacts(Map<Artifact, Set<String>> artifacts) {
         if (artifacts.isEmpty()) {
             getLog().info("   None");
         } else {
             for (Map.Entry<Artifact, Set<String>> entry : artifacts.entrySet()) {
                 // called because artifact will set the version to -SNAPSHOT only if I do this. MNG-2961
                 entry.getKey().isSnapshot();
 
-                if (warn) {
-                    logDependencyWarning("   " + entry.getKey());
-                    for (String clazz : entry.getValue()) {
-                        logDependencyWarning("      class " + clazz);
-                    }
-                } else {
-                    getLog().info("   " + entry.getKey());
-                    for (String clazz : entry.getValue()) {
-                        getLog().info("      class " + clazz);
-                    }
+                logDependencyWarning("   " + entry.getKey());
+                for (String clazz : entry.getValue()) {
+                    logDependencyWarning("      class " + clazz);
                 }
             }
         }

src/main/java/org/apache/maven/plugins/dependency/fromConfiguration/AbstractFromConfigurationMojo.java

@@ -162,7 +162,7 @@ protected List<ArtifactItem> getProcessedArtifactItems(ProcessArtifactItemsReque
 
         boolean removeClassifier = processArtifactItemsRequest.isRemoveClassifier();
 
-        if (artifactItems == null || artifactItems.size() < 1) {
+        if (artifactItems == null || artifactItems.isEmpty()) {
             throw new MojoExecutionException("There are no artifactItems configured.");
         }
 
@@ -182,7 +182,7 @@ protected List<ArtifactItem> getProcessedArtifactItems(ProcessArtifactItemsReque
             artifactItem.setArtifact(this.getArtifact(artifactItem));
 
             if (artifactItem.getDestFileName() == null
-                    || artifactItem.getDestFileName().length() == 0) {
+                    || artifactItem.getDestFileName().isEmpty()) {
                 artifactItem.setDestFileName(DependencyUtil.getFormattedFileName(
                         artifactItem.getArtifact(), removeVersion, prependGroupId, useBaseVersion, removeClassifier));
             }

src/main/java/org/apache/maven/plugins/dependency/resolvers/ResolvePluginsMojo.java

@@ -110,7 +110,7 @@ protected void doExecute() throws MojoExecutionException {
             sb.append(System.lineSeparator());
             sb.append("The following plugins have been resolved:");
             sb.append(System.lineSeparator());
-            if (plugins == null || plugins.isEmpty()) {
+            if (plugins.isEmpty()) {
                 sb.append("   none");
                 sb.append(System.lineSeparator());
             } else {

src/main/java/org/apache/maven/plugins/dependency/tree/JsonDependencyNodeVisitor.java

@@ -56,7 +56,7 @@ public boolean visit(DependencyNode node) {
      * @param node  the node to write
      */
     private void writeRootNode(DependencyNode node) {
-        Set<DependencyNode> visited = new HashSet<DependencyNode>();
+        Set<DependencyNode> visited = new HashSet<>();
         int indent = 2;
         StringBuilder sb = new StringBuilder();
         sb.append("{").append("\n");