diff --git a/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java b/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java
index 30217ac9e0..e536948529 100644
--- a/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java
+++ b/org.talend.librariesmanager/resources/java/routines/system/StringUtils.java
@@ -309,106 +309,4 @@ public class StringUtils {
 		return String.valueOf(d);
 	}
 	
-	/**
-	 * delete namespace prefix in the xpath
-	 * @param xpath the source xpath
-	 * @return
-	 *
-	 * example
-	 * ./ns:aa/ns:b ==> ./aa/b
-	 * ../ns:aa/ns:b ==> ../aa/b
-	 * ../aa/ns:b ==> ../aa/b
-	 * ../aa/ns:b/../ns:a/a ==> ../aa/b/../a/a
-	 * /aa/b/c ==> /aa/b/c
-	 * /aa/b/c/@e ==> /aa/b/c/@e
-	 * /aa/b/c/@ns:e ==> /aa/b/c/@e
-	 * aa ==> aa
-	 * ns:aa ==> aa
-	 * child::book ==> child::book
-	 * attribute::attr ==> attribute::attr
-	 * to[@a:attri="xxx:yyy"]/ns:a ==> to[@attri="xxx:yyy"]/a
-	 * to[.="to:yyy"]/ns:a ==> to[.="to:yyy"]/a
-	 * substring('12:3"4:5',2,3) ==> substring('12:3"4:5',2,3)
-	 * substring("12:3'4:5",2,3) ==> substring("12:3'4:5",2,3)
-	 * //name[@ns:attri="xxx:yyyy"] ==> //name[@attri="xxx:yyyy"]
-	 * //name[@ns:attri="xxx:yyyy"]/ns:b/@ns:a ==> //name[@attri="xxx:yyyy"]/b/@a
-	 * body[ns:age/ns:name/@ns:b="12:3"]/age ==> body[age/name/@b="12:3"]/age
-	 * 
-	 */
-	public static String deletePrefixForXpath(String xpath) {
-		if(xpath==null) {
-			return null;
-		}
-		
-		char[] block = null;
-		StringBuffer sb = new StringBuffer();
-		
-		int size = xpath.length();
-		int start = -1;
-		int offset = 0;
-		
-		char next = ' ';
-		
-		boolean literal = false;
-		char textEnclosure = ' '; 
-		
-		for(int i=0;i<size;i++) {
-			if(':' == next) {
-				next = ' ';
-				continue;
-			}
-			
-			int end = -1;
-			char c = xpath.charAt(i);
-			
-			if(c == '\'' || c == '"') {
-				if(!literal) {//literal start
-					literal = true;
-					textEnclosure = c;
-				} else if(textEnclosure == c){//literal end
-					literal = false;
-					textEnclosure = ' ';
-				}
-			}
-			
-			if(literal) {
-				continue;
-			}
-			
-			if('/' == c || '@' == c  || '[' == c) {//element or attribute start
-				start = i;
-			}
-			
-			if(':' == c) {//local element name or attribute name start
-				if(i<size-1) {
-					next = xpath.charAt(i+1);
-				}
-				if(':'!=next) {
-					end = i;
-				}
-			}
-			
-			if(end!=-1) {
-				if(block==null) {
-					block = xpath.toCharArray();
-				}
-				sb.append(block,offset,start+1-offset);
-				offset = end + 1;
-			}
-		}
-		
-		if(offset == 0) {
-			return xpath;
-		}
-		
-		if(offset < size) {//append the trail
-			if(block==null) {
-				block = xpath.toCharArray();
-			}
-			sb.append(block,offset,size - offset);
-		}
-		
-		return sb.toString();
-	}
-	
 }