try

src/org/qg/StageBucket.groovy

@@ -3,7 +3,7 @@ package org.qg;
 import groovy.json.JsonSlurperClassic;
 import org.qg.Utils;
 
-
+def _utils = new org.qg.Utils();
 
 def prepare_java(systemName, contextDir) {
     sh "rm -rf ${contextDir}"
@@ -12,7 +12,7 @@ def prepare_java(systemName, contextDir) {
     
     sh "cd /home/quant_group/config_repository/java; git pull; cd -"
     sh "cp -rf /home/quant_group/config_repository/java/${systemName}.properties ${contextDir}/application.properties"
-    org.qg.Utils.replaceDomain("${contextDir}/application.properties")
+    _utils.replaceDomain("${contextDir}/application.properties")
 /*    sh "sed -i \"s/.xyqb.com/-${namespace}.q-gp.com/\" "*/
 }