Issue #957: Resolve PMD DefaultPackage rule problems in gui package

src/main/java/com/puppycrawl/tools/checkstyle/gui/ListToTreeSelectionModelWrapper.java

@@ -60,7 +60,7 @@ class ListToTreeSelectionModelWrapper extends DefaultTreeSelectionModel {
      *
      * @return the list selection model
      */
-    final ListSelectionModel getListSelectionModel() {
+    protected final ListSelectionModel getListSelectionModel() {
         return listSelectionModel;
     }
 

src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeTableModel.java

@@ -53,7 +53,7 @@ public class ParseTreeTableModel implements TreeModel {
      * Sets parse tree.
      * @param parseTree DetailAST parse tree.
      */
-    final void setParseTree(DetailAST parseTree) {
+    protected final void setParseTree(DetailAST parseTree) {
         pModel.setParseTree(parseTree);
         final Object[] path = {pModel.getRoot()};
         // no need to setup remaining info, as the call results in a
@@ -146,7 +146,7 @@ public class ParseTreeTableModel implements TreeModel {
      * @param children An array of Object containing the inserted, removed, or changed objects.
      * @see EventListenerList
      */
-    final void fireTreeStructureChanged(Object source, Object[] path,
+    private void fireTreeStructureChanged(Object source, Object[] path,
                                   int[] childIndices,
                                   Object... children) {
         // Guaranteed to return a non-null array

src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeTablePModel.java

@@ -64,7 +64,7 @@ public class ParseTreeTablePModel {
      * Set parse tree.
      * @param parseTree DetailAST parse tree.
      */
-    final void setParseTree(DetailAST parseTree) {
+    protected final void setParseTree(DetailAST parseTree) {
         ((AST) root).setFirstChild(parseTree);
     }