1 files changed, 8 insertions, 4 deletions
diff --git a/libjava/classpath/java/lang/Thread.java b/libjava/classpath/java/lang/Thread.java
index 37ca630b4ed..763228c16ef 100644
--- a/libjava/classpath/java/lang/Thread.java
+++ b/libjava/classpath/java/lang/Thread.java
@@ -38,6 +38,7 @@ exception statement from your version. */
 
 package java.lang;
 
+import java.security.Permission;
 import java.util.Map;
 import java.util.WeakHashMap;
 
@@ -704,7 +705,7 @@ public class Thread implements Runnable
    *
    * @return the context class loader
    * @throws SecurityException when permission is denied
-   * @see setContextClassLoader(ClassLoader)
+   * @see #setContextClassLoader(ClassLoader)
    * @since 1.2
    */
   public synchronized ClassLoader getContextClassLoader()
@@ -726,7 +727,7 @@ public class Thread implements Runnable
    *
    * @param classloader the new context class loader
    * @throws SecurityException when permission is denied
-   * @see getContextClassLoader()
+   * @see #getContextClassLoader()
    * @since 1.2
    */
   public synchronized void setContextClassLoader(ClassLoader classloader)
@@ -812,8 +813,11 @@ public class Thread implements Runnable
   {
 
     // Check parameters
-    if (ms < 0 || ns < 0 || ns > 999999)
-      throw new IllegalArgumentException();
+    if (ms < 0 )
+      throw new IllegalArgumentException("Negative milliseconds: " + ms);
+
+    if (ns < 0 || ns > 999999)
+      throw new IllegalArgumentException("Nanoseconds ouf of range: " + ns);
 
     // Really sleep
     VMThread.sleep(ms, ns);