Hi Howard, Thanks for your advice.
As per your advice, I changed the model to literal type but still the same. Further, I attached Tapestry source code(5.2.1) along my debug path and found that the enumClass.getEnumConstants() at line #41 of EnumSelectModel class was returning NULL only for the following implementation style (EnumSelectModel is working fine in other pages): - We have build a component to handle Select drop down called editselectfield.tml. It includes the select as shown below. But for our investigation, I have change the model to literal type now otherwise it is model="${fieldType}": <t:select clientId="${clientId}_txt" blankOption="never" value="field" model="literal:Red,Green,Blue"/> //Line 6 - From the parent pages, we include our editselectfield.tml as shown below: <t:editselectfield clientId="relationship" field="dater.relationship" fieldType="relationship" lable="Status" addDesc="Add your relationship status"/> Where relationship is Enum : public enum Relationship { RS1, RS2, RS3, RS4; } I have changed the model type to literal in our editselectfield component but I still get this issue. classpath:com/skyecandy/components/EditSelectField.tml, line 6 1 <div class="content_row" xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd"> 2 <t:form> 3 <div class="content_row_${leftLength}left">${lable}</div> 4 <div class="content_row_long_${rightLength}right" id="${clientId}" style="display:none;"> 5 <textarea id="${clientId}_txt_placeholder" style="display:none;">${fieldValue}</textarea> 6 <t:select clientId="${clientId}_txt" blankOption="never" value="field" model="literal:Red,Green,Blue"/> 7 # /images/buttons/save_new.gif   8 # Cancel 9 </div> 10 <t:zone class="content_row_${rightLength}right" visible="true" update="show" t:id="editFieldZone" id="${clientId}_zone"> 11 <t:if test="fieldAdd"> Any advice would be of great help for us to resolve this issue. Thank you, Vinod -- View this message in context: http://tapestry.1045711.n5.nabble.com/org-apache-tapestry5-util-EnumSelectModel-java-lang-NullPointerException-migrate-from-Tapestry-5-1-04-tp3356787p3357359.html Sent from the Tapestry - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org For additional commands, e-mail: users-h...@tapestry.apache.org