diff -urEbwB swingx-project-1.6.5-1.orig/swingx-core/src/main/java/org/jdesktop/swingx/error/ErrorSupport.java swingx-project-1.6.5-1/swingx-core/src/main/java/org/jdesktop/swingx/error/ErrorSupport.java
--- swingx-project-1.6.5-1.orig/swingx-core/src/main/java/org/jdesktop/swingx/error/ErrorSupport.java	2022-04-10 09:44:29.638589866 +0200
+++ swingx-project-1.6.5-1/swingx-core/src/main/java/org/jdesktop/swingx/error/ErrorSupport.java	2022-04-10 13:16:53.726099179 +0200
@@ -68,7 +68,7 @@
      * added.
      */
     public ErrorListener[] getErrorListeners() {
-        return listeners.toArray(null);
+        return listeners.toArray(new ErrorListener[0]);
     }
 
     /**
diff -urEbwB swingx-project-1.6.5-1.orig/swingx-core/src/main/java/org/jdesktop/swingx/JXTable.java swingx-project-1.6.5-1/swingx-core/src/main/java/org/jdesktop/swingx/JXTable.java
--- swingx-project-1.6.5-1.orig/swingx-core/src/main/java/org/jdesktop/swingx/JXTable.java	2022-04-10 09:44:29.630589818 +0200
+++ swingx-project-1.6.5-1/swingx-core/src/main/java/org/jdesktop/swingx/JXTable.java	2022-04-10 13:14:14.885160147 +0200
@@ -570,7 +570,7 @@
      * @param rowData Row data, as a Vector of Objects.
      * @param columnNames Column names, as a Vector of Strings.
      */
-    public JXTable(Vector<?> rowData, Vector<?> columnNames) {
+    public JXTable(Vector<? extends Vector> rowData, Vector<?> columnNames) {
         super(rowData, columnNames);
         init();
     }
diff -urEbwB swingx-project-1.6.5-1.orig/swingx-core/src/main/java/org/jdesktop/swingx/tree/TreeUtilities.java swingx-project-1.6.5-1/swingx-core/src/main/java/org/jdesktop/swingx/tree/TreeUtilities.java
--- swingx-project-1.6.5-1.orig/swingx-core/src/main/java/org/jdesktop/swingx/tree/TreeUtilities.java	2022-04-10 09:44:29.642589889 +0200
+++ swingx-project-1.6.5-1/swingx-core/src/main/java/org/jdesktop/swingx/tree/TreeUtilities.java	2022-04-10 13:23:22.448397272 +0200
@@ -270,7 +270,7 @@
         }
 
         protected Enumeration<M> getChildren(M node) {
-            Enumeration<M> children = node.children();
+            Enumeration<M> children = (Enumeration<M>) node.children();
             return children;
         }
 
@@ -328,7 +328,7 @@
          * @return
          */
         protected Enumeration<M> getChildren(M node) {
-            return node.children();
+            return (Enumeration<M>) node.children();
         }
         
 
@@ -374,7 +374,7 @@
         }
 
         protected Enumeration<M> getChildren(M node) {
-            Enumeration<M> children = node.children();
+            Enumeration<M> children = (Enumeration<M>) node.children();
             return children;
         }