fix Serializable classes that were in fact not Serializable

src/main/org/apache/tools/ant/RuntimeConfigurable.java

@@ -52,7 +52,8 @@ public class RuntimeConfigurable implements Serializable {
     private String elementTag = null;
 
     /** List of child element wrappers. */
-    private List<RuntimeConfigurable> children = null;
+    // picking ArrayList rather than List as arrayList is Serializable
+    private ArrayList<RuntimeConfigurable> children = null;
 
     /** The element to configure. It is only used during
      * maybeConfigure.
@@ -589,7 +590,7 @@ public class RuntimeConfigurable implements Serializable {
 
         // Children (this is a shadow of UnknownElement#children)
         if (r.children != null) {
-            List<RuntimeConfigurable> newChildren = new ArrayList<RuntimeConfigurable>();
+            ArrayList<RuntimeConfigurable> newChildren = new ArrayList<RuntimeConfigurable>();
             newChildren.addAll(r.children);
             if (children != null) {
                 newChildren.addAll(children);

src/main/org/apache/tools/zip/UnsupportedZipFeatureException.java

@@ -28,8 +28,8 @@ import java.util.zip.ZipException;
 public class UnsupportedZipFeatureException extends ZipException {
 
     private final Feature reason;
-    private final ZipEntry entry;
-    private static final long serialVersionUID = 4430521921766595597L;
+    private transient final ZipEntry entry;
+    private static final long serialVersionUID = 20161221L;
 
     /**
      * Creates an exception.
@@ -61,7 +61,7 @@ public class UnsupportedZipFeatureException extends ZipException {
     /**
      * ZIP Features that may or may not be supported.
      */
-    public static class Feature {
+    public static class Feature implements java.io.Serializable {
         /**
          * The entry is encrypted.
          */
@@ -86,4 +86,4 @@ public class UnsupportedZipFeatureException extends ZipException {
             return name;
         }
     }
-}
+}