diff --git a/src/test/java/org/apache/commons/logging/AltHashtable.java b/src/test/java/org/apache/commons/logging/AltHashtable.java
index ebcbc48..231cda7 100644
--- a/src/test/java/org/apache/commons/logging/AltHashtable.java
+++ b/src/test/java/org/apache/commons/logging/AltHashtable.java
@@ -21,6 +21,11 @@ import java.util.Hashtable;
 
 public class AltHashtable extends Hashtable {
 
+    /**
+     * Generated serial version ID.
+     */
+    private static final long serialVersionUID = 8927996458633688095L;
+    
     public static Object lastKey;
     public static Object lastValue;
 
diff --git a/src/test/java/org/apache/commons/logging/security/SecurityAllowedTestCase.java b/src/test/java/org/apache/commons/logging/security/SecurityAllowedTestCase.java
index 9ab7ad9..11f5352 100644
--- a/src/test/java/org/apache/commons/logging/security/SecurityAllowedTestCase.java
+++ b/src/test/java/org/apache/commons/logging/security/SecurityAllowedTestCase.java
@@ -48,6 +48,11 @@ public class SecurityAllowedTestCase extends TestCase
     // Dummy special hashtable, so we can tell JCL to use this instead of
     // the standard one.
     public static class CustomHashtable extends Hashtable {
+
+        /**
+         * Generated serial version ID.
+         */
+        private static final long serialVersionUID = 8941017300059246720L;
     }
 
     /**
diff --git a/src/test/java/org/apache/commons/logging/security/SecurityForbiddenTestCase.java b/src/test/java/org/apache/commons/logging/security/SecurityForbiddenTestCase.java
index 8734337..00fe66f 100644
--- a/src/test/java/org/apache/commons/logging/security/SecurityForbiddenTestCase.java
+++ b/src/test/java/org/apache/commons/logging/security/SecurityForbiddenTestCase.java
@@ -51,6 +51,11 @@ public class SecurityForbiddenTestCase extends TestCase
     // Dummy special hashtable, so we can tell JCL to use this instead of
     // the standard one.
     public static class CustomHashtable extends Hashtable {
+
+        /**
+         * Generated serial version ID.
+         */
+        private static final long serialVersionUID = 7224652794746236024L;
     }
 
     /**
diff --git a/src/test/java/org/apache/commons/logging/simple/DecoratedSimpleLog.java b/src/test/java/org/apache/commons/logging/simple/DecoratedSimpleLog.java
index c68c2cb..0129bcd 100644
--- a/src/test/java/org/apache/commons/logging/simple/DecoratedSimpleLog.java
+++ b/src/test/java/org/apache/commons/logging/simple/DecoratedSimpleLog.java
@@ -35,6 +35,11 @@ public class DecoratedSimpleLog extends SimpleLog {
     // ------------------------------------------------------------ Constructor
 
 
+    /**
+     * Generated serial version ID.
+     */
+    private static final long serialVersionUID = 196544280770017153L;
+
     public DecoratedSimpleLog(String name) {
         super(name);
     }
diff --git a/src/test/java/org/apache/commons/logging/simple/LogRecord.java b/src/test/java/org/apache/commons/logging/simple/LogRecord.java
index 4f1e723..0c6d784 100644
--- a/src/test/java/org/apache/commons/logging/simple/LogRecord.java
+++ b/src/test/java/org/apache/commons/logging/simple/LogRecord.java
@@ -25,6 +25,11 @@ import java.io.Serializable;
 public class LogRecord implements Serializable {
 
 
+    /**
+     * Generated serial version ID.
+     */
+    private static final long serialVersionUID = -5254831759209770665L;
+    
     public LogRecord(int type, Object message, Throwable t) {
         this.type = type;
         this.message = message;