show validation error messages in visualforce

Question

I have a visualforce page with custom controller. I have added apex:pagemessages tag below pageblock. I have a method say method1 which updates a record in obj A which inturn updates obj B via trigger. But a validation rule in obj B fails.

My code is as follows:

public void method1(){
 try{ 
  update rec;
 }
 catch(System.DmlException e){ 
   ApexPages.Message msg = new apexPages.Message(Apexpages.Severity.ERROR, e.getdmlMessage(0));
   ApexPages.addMessage(msg);
 }
}

But this error message is not shown in vf page. This error is seen as excpetion in the debug logs.

Answer 1

I tried with your VF page and it is working for me. Click the reload button to see the message.

VF Page - testerrorpage

<apex:page controller="TestErrorClass">
<apex:form >
    <apex:pageblock >
        <apex:pagemessages />
        <apex:commandButton action="{!processtempcount}" value="Reload"/>
    </apex:pageblock>
</apex:form>

Controller

public class TestErrorClass {
  public Integer myInt { get; set; }
  public TestErrorClass (){
      myInt = 0;
  }
  public pagereference processtempcount(){
      pagereference p = apexpages.Currentpage();
      apexpages.Message msg = new Apexpages.Message(ApexPages.Severity.Info,'Total Number of reloads: ' + (myInt++));
      apexpages.addmessage(msg);
      return p; 
  }
}

Answer 2

Can you please post your VF page code, just check if you have added apexpage:messages attribute in your page