diff --git a/docs/manual/CoreTasks/jar.html b/docs/manual/CoreTasks/jar.html
index f37786b41..9402a4bdf 100644
--- a/docs/manual/CoreTasks/jar.html
+++ b/docs/manual/CoreTasks/jar.html
@@ -230,11 +230,14 @@ to a value other than its default, <code>"add"</code>.</b></p>
   </tr>
   <tr>
     <td valign="top">strict</td>
-    <td valign="top">When this attribut is set to <tt>true</tt>, a BuildException 
-    will be thrown if the packaging version specification was broken. If set to 
-    <tt>false</tt> (default) only a message is logged (verbose).
-     <br>Defaults to false.  <em>Since Ant 1.7.1</em></td>
-    <td valign="top" align="center">No</td>
+    <td valign="top">Configures how to handle breaks of the packaging version
+    specification: <ul>
+    <li><b>fail</b> = throws a BuildException</li>
+    <li><b>warn</b> = logs a message on warn level</li>
+    <li><b>ignore</b> = logs a message on verbose level (default)</li>
+    </ul>
+    <em>Since Ant 1.7.1</em></td>
+    <td valign="top" align="center">No, defaults to <tt>ignore</tt>. </td>
   </tr>
 </table>
 
diff --git a/src/etc/testcases/taskdefs/jar.xml b/src/etc/testcases/taskdefs/jar.xml
index 6b232e4d0..bfabf8e05 100644
--- a/src/etc/testcases/taskdefs/jar.xml
+++ b/src/etc/testcases/taskdefs/jar.xml
@@ -237,20 +237,30 @@
     </jar>
   </target>
     
-  <target name="testNoVersionInfo">
+  <target name="testNoVersionInfoNoStrict">
     <mkdir dir="${tmp.dir}"/>
-    <jar destfile="${tmp.jar}" basedir="${tmp.dir}" strict="true"/>
+    <jar destfile="${tmp.jar}" basedir="${tmp.dir}"/>
   </target>  
 
-  <target name="testNoVersionInfoNoStrict">
+  <target name="testNoVersionInfoFail">
     <mkdir dir="${tmp.dir}"/>
-    <jar destfile="${tmp.jar}" basedir="${tmp.dir}"/>
+    <jar destfile="${tmp.jar}" basedir="${tmp.dir}" strict="fail"/>
+  </target>  
+
+  <target name="testNoVersionInfoIgnore">
+    <mkdir dir="${tmp.dir}"/>
+    <jar destfile="${tmp.jar}" basedir="${tmp.dir}" strict="ignore"/>
   </target>  
 
+  <target name="testNoVersionInfoWarn">
+    <mkdir dir="${tmp.dir}"/>
+    <jar destfile="${tmp.jar}" basedir="${tmp.dir}" strict="warn"/>
+  </target>  
+    
   <!-- see http://java.sun.com/j2se/1.3/docs/guide/versioning/spec/VersioningSpecification.html#PackageVersioning -->  
   <target name="testHasVersionInfo">
     <mkdir dir="${tmp.dir}"/>
-    <jar destfile="${tmp.jar}" basedir="${tmp.dir}" strict="true">
+    <jar destfile="${tmp.jar}" basedir="${tmp.dir}" strict="fail">
       <manifest>
         <attribute name="Implementation-Title"   value="Packaging Version Test"/>
         <attribute name="Implementation-Version" value="1.0"/>
diff --git a/src/main/org/apache/tools/ant/taskdefs/Jar.java b/src/main/org/apache/tools/ant/taskdefs/Jar.java
index de218d51f..e727efc98 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Jar.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Jar.java
@@ -143,11 +143,13 @@ public class Jar extends Zip {
      */
     private Path indexJars;
 
+    // CheckStyle:LineLength OFF - Link is too long.
     /**
      * Strict mode for checking rules of the JAR-Specification.
      * @see http://java.sun.com/j2se/1.3/docs/guide/versioning/spec/VersioningSpecification.html#PackageVersioning
      */
-    private boolean strict = false;
+    private StrictMode strict;
+    // CheckStyle:LineLength ON
 
     /**
      * Extra fields needed to make Solaris recognize the archive as a jar file.
@@ -165,6 +167,7 @@ public class Jar extends Zip {
         emptyBehavior = "create";
         setEncoding("UTF8");
         rootEntries = new Vector();
+        strict = new StrictMode("ignore");
     }
 
     /**
@@ -196,8 +199,8 @@ public class Jar extends Zip {
      * will be thrown if the Jar-Packaging specification was broken.
      * @param strict New value of the strict mode.
      */
-    public void setStrict(boolean strict) {
-        this.strict = strict;
+    public void setStrict(String strict) {
+        this.strict = new StrictMode(strict);
     }
 
     /**
@@ -802,15 +805,17 @@ public class Jar extends Zip {
         rootEntries.removeAllElements();
     }
 
+    // CheckStyle:LineLength OFF - Link is too long.
     /**
      * Check against packaging spec
      * @see http://java.sun.com/j2se/1.3/docs/guide/versioning/spec/VersioningSpecification.html#PackageVersioning
      */
+    // CheckStyle:LineLength ON
     private void checkJarSpec() {
         String br = System.getProperty("line.separator");
         StringBuffer message = new StringBuffer();
         Section mainSection = (configuredManifest == null)
-                            ? null 
+                            ? null
                             : configuredManifest.getMainSection();
 
         if (mainSection == null) {
@@ -833,10 +838,10 @@ public class Jar extends Zip {
             message.append(br);
             message.append("Location: ").append(getLocation());
             message.append(br);
-            if (strict) {
+            if (strict.getValue().equalsIgnoreCase("fail")) {
                 throw new BuildException(message.toString(), getLocation());
             } else {
-                log(message.toString(), Project.MSG_VERBOSE);
+                log(message.toString(), strict.getLogLevel());
             }
         }
     }
@@ -1025,4 +1030,25 @@ public class Jar extends Zip {
             }
         }
     }
+
+    // CheckStyle:JavadocType OFF - simple enum
+    public class StrictMode extends EnumeratedAttribute {
+        // CheckStyle:JavadocMethod OFF - simple enum
+        public StrictMode() {
+        }
+        public StrictMode(String value) {
+            setValue(value);
+        }
+        public String[] getValues() {
+            return new String[]{"fail", "warn", "ignore"};
+        }
+        /**
+         * @return The log level according to the strict mode.
+         */
+        public int getLogLevel() {
+            return (getValue().equals("ignore")) ? Project.MSG_VERBOSE : Project.MSG_WARN;
+        }
+        // CheckStyle:JavadocMethod ON
+    }
+    // CheckStyle:JavadocType ON
 }
diff --git a/src/tests/junit/org/apache/tools/ant/taskdefs/JarTest.java b/src/tests/junit/org/apache/tools/ant/taskdefs/JarTest.java
index 11766387a..977767ecf 100644
--- a/src/tests/junit/org/apache/tools/ant/taskdefs/JarTest.java
+++ b/src/tests/junit/org/apache/tools/ant/taskdefs/JarTest.java
@@ -268,8 +268,22 @@ public class JarTest extends BuildFileTest {
         executeTarget("testIndexJarsPlusJarMarker");
     }
     
-    public void testNoVersionInfo() {
-        expectBuildExceptionContaining("testNoVersionInfo", "Manifest Implemention information missing.", "No Implementation-Title set.");
+    public void testNoVersionInfoFail() {
+        expectBuildExceptionContaining("testNoVersionInfoFail", "Manifest Implemention information missing.", "No Implementation-Title set.");
+    }
+    
+    public void testNoVersionInfoIgnore() {
+        executeTarget("testNoVersionInfoIgnore");
+        assertTrue( getFullLog().contains("No Implementation-Title set.") );
+        assertTrue( getFullLog().contains("No Implementation-Version set.") );
+        assertTrue( getFullLog().contains("No Implementation-Vendor set.") );
+    }
+
+    public void testNoVersionInfoWarn() {
+        executeTarget("testNoVersionInfoWarn");
+        assertTrue( getLog().contains("No Implementation-Title set.") );
+        assertTrue( getLog().contains("No Implementation-Version set.") );
+        assertTrue( getLog().contains("No Implementation-Vendor set.") );
     }
 
     public void testNoVersionInfoNoStrict() {