fix bug 234
diff --git a/integration/src/test/java/org/slf4j/IncompatibleMultiBindingAssertionTest.java b/integration/src/test/java/org/slf4j/IncompatibleMultiBindingAssertionTest.java
new file mode 100644
index 0000000..455da4b
--- /dev/null
+++ b/integration/src/test/java/org/slf4j/IncompatibleMultiBindingAssertionTest.java
@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) 2004-2011 QOS.ch
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free  of charge, to any person obtaining
+ * a  copy  of this  software  and  associated  documentation files  (the
+ * "Software"), to  deal in  the Software without  restriction, including
+ * without limitation  the rights to  use, copy, modify,  merge, publish,
+ * distribute,  sublicense, and/or sell  copies of  the Software,  and to
+ * permit persons to whom the Software  is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The  above  copyright  notice  and  this permission  notice  shall  be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+ * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+ * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+package org.slf4j;
+
+import java.io.PrintStream;
+import java.util.List;
+import java.util.Random;
+
+import junit.framework.TestCase;
+
+public class IncompatibleMultiBindingAssertionTest extends TestCase {
+
+  StringPrintStream sps = new StringPrintStream(System.err);
+  PrintStream old = System.err;
+  int diff = 1024 + new Random().nextInt(10000);
+
+  public IncompatibleMultiBindingAssertionTest(String name) {
+    super(name);
+  }
+
+  protected void setUp() throws Exception {
+    super.setUp();
+    System.setErr(sps);
+  }
+
+  protected void tearDown() throws Exception {
+    super.tearDown();
+    System.setErr(old);
+  }
+
+  public void test() throws Exception {
+    try {
+      Logger logger = LoggerFactory.getLogger(this.getClass());
+      String msg = "hello world " + diff;
+      logger.info(msg);
+      fail("was expecting NoSuchMethodError");
+    } catch (NoSuchMethodError e) {
+    }
+    List list = sps.stringList;
+    assertMsgContains(list, 0, "Class path contains multiple SLF4J bindings.");
+    assertMsgContains(list, 1, "Found binding in");
+    assertMsgContains(list, 2, "Found binding in");
+    assertMsgContains(list, 3, "See http://www.slf4j.org/codes.html");
+    assertMsgContains(list, 4,
+        "slf4j-api 1.6.x (or later) is incompatible with this binding");
+    assertMsgContains(list, 5, "Your binding is version 1.5.5 or earlier.");
+
+  }
+
+  void assertMsgContains(List strList, int index, String msg) {
+    assertTrue(((String) strList.get(index)).contains(msg));
+  }
+}
diff --git a/slf4j-ext/src/main/java/org/slf4j/ext/LoggerWrapper.java b/slf4j-ext/src/main/java/org/slf4j/ext/LoggerWrapper.java
index d776c1f..c1aeaff 100644
--- a/slf4j-ext/src/main/java/org/slf4j/ext/LoggerWrapper.java
+++ b/slf4j-ext/src/main/java/org/slf4j/ext/LoggerWrapper.java
@@ -163,7 +163,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void trace(Marker marker, String msg) {
-    if (!logger.isTraceEnabled())
+    if (!logger.isTraceEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -177,7 +177,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void trace(Marker marker, String format, Object arg) {
-    if (!logger.isTraceEnabled())
+    if (!logger.isTraceEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg)
@@ -194,7 +194,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void trace(Marker marker, String format, Object arg1, Object arg2) {
-    if (!logger.isTraceEnabled())
+    if (!logger.isTraceEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg1, arg2)
@@ -211,7 +211,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void trace(Marker marker, String format, Object[] argArray) {
-    if (!logger.isTraceEnabled())
+    if (!logger.isTraceEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.arrayFormat(format, argArray)
@@ -227,7 +227,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void trace(Marker marker, String msg, Throwable t) {
-    if (!logger.isTraceEnabled())
+    if (!logger.isTraceEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -338,7 +338,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void debug(Marker marker, String msg) {
-    if (!logger.isDebugEnabled())
+    if (!logger.isDebugEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -352,7 +352,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void debug(Marker marker, String format, Object arg) {
-    if (!logger.isDebugEnabled())
+    if (!logger.isDebugEnabled(marker))
       return;
     if (instanceofLAL) {
       FormattingTuple ft = MessageFormatter.format(format, arg);
@@ -368,7 +368,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void debug(Marker marker, String format, Object arg1, Object arg2) {
-    if (!logger.isDebugEnabled())
+    if (!logger.isDebugEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg1, arg2)
@@ -385,7 +385,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void debug(Marker marker, String format, Object[] argArray) {
-    if (!logger.isDebugEnabled())
+    if (!logger.isDebugEnabled(marker))
       return;
     if (instanceofLAL) {
 
@@ -402,7 +402,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void debug(Marker marker, String msg, Throwable t) {
-    if (!logger.isDebugEnabled())
+    if (!logger.isDebugEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -513,7 +513,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void info(Marker marker, String msg) {
-    if (!logger.isInfoEnabled())
+    if (!logger.isInfoEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -527,7 +527,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void info(Marker marker, String format, Object arg) {
-    if (!logger.isInfoEnabled())
+    if (!logger.isInfoEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg)
@@ -544,7 +544,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void info(Marker marker, String format, Object arg1, Object arg2) {
-    if (!logger.isInfoEnabled())
+    if (!logger.isInfoEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg1, arg2)
@@ -561,7 +561,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void info(Marker marker, String format, Object[] argArray) {
-    if (!logger.isInfoEnabled())
+    if (!logger.isInfoEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.arrayFormat(format, argArray)
@@ -577,7 +577,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void info(Marker marker, String msg, Throwable t) {
-    if (!logger.isInfoEnabled())
+    if (!logger.isInfoEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -685,7 +685,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void warn(Marker marker, String msg) {
-    if (!logger.isWarnEnabled())
+    if (!logger.isWarnEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -699,7 +699,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void warn(Marker marker, String format, Object arg) {
-    if (!logger.isWarnEnabled())
+    if (!logger.isWarnEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg)
@@ -716,7 +716,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void warn(Marker marker, String format, Object arg1, Object arg2) {
-    if (!logger.isWarnEnabled())
+    if (!logger.isWarnEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg1, arg2)
@@ -733,7 +733,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void warn(Marker marker, String format, Object[] argArray) {
-    if (!logger.isWarnEnabled())
+    if (!logger.isWarnEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.arrayFormat(format, argArray)
@@ -749,7 +749,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void warn(Marker marker, String msg, Throwable t) {
-    if (!logger.isWarnEnabled())
+    if (!logger.isWarnEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -860,7 +860,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void error(Marker marker, String msg) {
-    if (!logger.isErrorEnabled())
+    if (!logger.isErrorEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,
@@ -874,7 +874,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void error(Marker marker, String format, Object arg) {
-    if (!logger.isErrorEnabled())
+    if (!logger.isErrorEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg)
@@ -891,7 +891,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void error(Marker marker, String format, Object arg1, Object arg2) {
-    if (!logger.isErrorEnabled())
+    if (!logger.isErrorEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.format(format, arg1, arg2)
@@ -908,7 +908,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void error(Marker marker, String format, Object[] argArray) {
-    if (!logger.isErrorEnabled())
+    if (!logger.isErrorEnabled(marker))
       return;
     if (instanceofLAL) {
       String formattedMessage = MessageFormatter.arrayFormat(format, argArray)
@@ -924,7 +924,7 @@
    * Delegate to the appropriate method of the underlying logger.
    */
   public void error(Marker marker, String msg, Throwable t) {
-    if (!logger.isErrorEnabled())
+    if (!logger.isErrorEnabled(marker))
       return;
     if (instanceofLAL) {
       ((LocationAwareLogger) logger).log(marker, fqcn,