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Hello Russell, thank you for your interest. No, I'm not getting troubles because I'm doing it in a Widget Template.

I actually don't know how to get the specifications list starting from a product (CPCatalogEntry object). In particular my question was about the widget because in it I have this CPCatalogEntry list:

<#if entries?has_content>
	<#list entries as curCPCatalogEntry>
	       //do something
	</#list>
</#if>

I did it! this is the my code to get specifications:

<#if entries?has_content>

	<#list entries as curCPCatalogEntry>
		<#assign CPDefinitionLocalService = serviceLocator.findService("com.liferay.commerce.product.service.CPDefinitionLocalService")
			
			CPDefinition = CPDefinitionLocalService.getCPDefinition(curCPCatalogEntry.getCPDefinitionId())
			CPDefinitionSpecificationOptionValues = CPDefinition.getCPDefinitionSpecificationOptionValues()
		/>
		
		<#list CPDefinitionSpecificationOptionValues as cpdsov>
			<#assign cpSpecificationOption = cpdsov.getCPSpecificationOption() />
			<span>${cpSpecificationOption.getTitle(locale)}</span>
			<span>${cpdsov.getValue()}</span>
		</#list>
		
	</#list>
</#if>

Great! You could make an answer with same content as your last comment, then accept it as the answer.