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In order, to make VF page available, to select as Opportunity new action, your apex page should have property standardController="Opportunity" e.g.
<apex:page standardController="Opportunity">
...
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Visualforce (well, the renderer that converts your Visualforce into HTML that ends up getting sent to your browser) doesn't have a way to access the variables of a class directly. Instead, Visualforce accesses things by calling a method.
Most times (except for methods given in the action parameter of things like <apex:page> and <apex:pageButton>),...
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You need to add get ; set; in order to access apex class members on the client side. This could be similar to what you're already doing with varLMI. You defined a getter getvarLMI that returns the value of varLMI.
or you can simply mark the property as get set.
Update line #3 to
public Integer bemSize{ get; set; }
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You are passing opportunity id as :ApexPages.currentPage().getParameters().get('OpportunityId') for opportunity lines and contact roles. But it should be : ApexPages.currentPage().getParameters().get('id')
public class controllerTest {
public Opportunity opportunity {get; set;}
public List<OpportunityLineItem> oppLineItem {get; set;}
public list<...
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If you want to use a Custom Controller and you still need to use the standard controller functions you can use a Controller Extension.
Change your Header to like this:
<apex:page standardController="Opportunity" extensions="controllerTest">
You would also need to modify your controller to handle the Opportunity. Like this:
private ...
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