diff --git a/ipojo/manipulator/src/main/java/org/apache/felix/ipojo/manipulator/Pojoization.java b/ipojo/manipulator/src/main/java/org/apache/felix/ipojo/manipulator/Pojoization.java
index e6ca46b..b45d239 100644
--- a/ipojo/manipulator/src/main/java/org/apache/felix/ipojo/manipulator/Pojoization.java
+++ b/ipojo/manipulator/src/main/java/org/apache/felix/ipojo/manipulator/Pojoization.java
@@ -801,7 +801,7 @@
      */
     private void setCreatedBy(Attributes att) {
         String prev = att.getValue("Created-By");
-        if (! prev.contains("iPOJO")) { // Avoid appending iPOJO several times
+        if (prev.indexOf("iPOJO") == -1) { // Avoid appending iPOJO several times
             att.putValue("Created-By", prev + " & iPOJO");
         }
     }
diff --git a/ipojo/plugin/src/main/java/org/apache/felix/ipojo/plugin/ManipulatorMojo.java b/ipojo/plugin/src/main/java/org/apache/felix/ipojo/plugin/ManipulatorMojo.java
index a6fb400..9b7ebb5 100644
--- a/ipojo/plugin/src/main/java/org/apache/felix/ipojo/plugin/ManipulatorMojo.java
+++ b/ipojo/plugin/src/main/java/org/apache/felix/ipojo/plugin/ManipulatorMojo.java
@@ -121,7 +121,7 @@
     }
     
     private boolean isXML() {
-        return m_metadata != null && m_metadata.contains("<");
+        return m_metadata != null && (m_metadata.indexOf('<') > -1);
     }
 
     /**