improve workflow
diff --git a/org.eclipse.wtp.releng.webupdatesite/build-home/updateMirrorProject.xml b/org.eclipse.wtp.releng.webupdatesite/build-home/updateMirrorProject.xml
index 6486e0c..71f68ae 100644
--- a/org.eclipse.wtp.releng.webupdatesite/build-home/updateMirrorProject.xml
+++ b/org.eclipse.wtp.releng.webupdatesite/build-home/updateMirrorProject.xml
@@ -3,9 +3,11 @@
     name="update"
     default="update"
     basedir=".">
+        <property environment="env"/>
+    
     <fail
-        unless="java15-home"
-        message="Must provide java15-home" />
+        unless="env.JAVA_5_HOME"
+        message="Must provide env.JAVA_5_HOME" />
     <property
         name="buildDirectory"
         value="${basedir}" />
@@ -18,7 +20,7 @@
             fork="true"
             resultProperty="updateResult"
             failonerror="false"
-            jvm="${java15-home}/bin/java"
+            jvm="${env.JAVA_5_HOME}/bin/java"
             classname="org.eclipse.equinox.launcher.Main">
             <classpath>
                 <fileset