(jdbc) Problème requête

public static void UpdateCMinDB(String nom_db, String affixe_db, String typeAffixe_db, char lettreException_db, char lettreAdditionnelle_db,String nom_db1, String affixe_db1, String typeAffixe_db1, char lettreException_db1, char lettreAdditionnelle_db1){
//...
 PreparedStatement pstmt = cn.prepareStatement("UPDATE CategorieMorphologique " + 
	        		"SET nom='" +nom_db1+ "'," + 
	        		"affixe='" +affixe_db1+ "'," + 
	        		"typeAffixe='" +typeAffixe_db1+ "'," + 
	        		"lettreException='" +lettreException_db1+ "'," + 
	        		"lettreAdditionnelle = '" +lettreAdditionnelle_db1+ 
	        		" WHERE nom='" +nom_db+ "' " + 
	        		"and affixe='" +affixe_db+ "' " + 
	        		"and typeAffixe='" +typeAffixe_db+ "' " + 
	        		"and lettreException='" +lettreException_db+ "' " + 
	        		"and lettreAdditionnelle ='" +lettreAdditionnelle_db+ "')");
	        		pstmt.executeUpdate(); 

//...

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'vrb' and affixe='ger' and typeAffixe='suffixe' and lettreException=' ' and lettr' at line 1

		UpdateCMinDB("vrb", "ger", "suffixe", ' ', ' ',"vrb", "ger", "suffixe", 'g', 'e');