2

I have the below Visualforce page & controller class for a user to select a design document type & upload a file. Document_Type__c is a picklist and should be required.

The code below works except in 1 situation. If you choose a file and click upload, it uploads the file without confirming the Document Type has been selected. This gives the view state size limit error.

When changing line 8 to

if (attachment == null) 
   transient Attachment attachment = new Attachment();

this ensures the Document Type is selected first but when trying to upload a file, it returns the de-reference a null object error.

Any help would be greatly appreciated.

Visualforce page:

    <apex:page showHeader="false" sidebar="false" standardController="Case" extensions="CreateDesignDocumentExtensionController">

<apex:messages />
    <apex:form id="theForm">

        <apex:pageBlock >

            <apex:variable var="a" value="{!newDesignDoc}" />

            <apex:pageBlockSection columns="1">
                <apex:inputField label="Document Type" value="{!a.Document_Type__c}" required="true"/>
                <apex:inputFile value="{!attachment.body}" filename="{!attachment.name}"/>
            </apex:pageBlockSection>

            <apex:pageBlockButtons location="bottom">
                <apex:commandButton action="{!save}" value="Upload"/>
            </apex:pageBlockButtons>

        </apex:pageBlock>
    </apex:form>

</apex:page>

Apex controller:

    public with sharing class CreateDesignDocumentExtensionController {

    public final Case designCase;
    public Design__c newDesignDoc { get; set; }

    public Attachment attachment {
        get {
            if (attachment == null) attachment = new Attachment();
            return attachment;
        }
        set;
    }

    public CreateDesignDocumentExtensionController (ApexPages.StandardController stdController) {
        designCase = (Case)stdController.getRecord();
        newDesignDoc = new Design__c();
    }

    public PageReference save() {       

        if (attachment.body == null) {
            ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'Choose file to upload'));

        } else {

            try {
                newDesignDoc.Case__c = designCase.Id;
                insert newDesignDoc;
                attachment.parentId = newDesignDoc.Id;
                insert attachment;
            }
            catch (DMLException e) {
                ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'Error uploading file'));
                return null;
            }
            finally {
                newDesignDoc.Document_Type__c = null;
                newDesignDoc = new Design__c();            
                attachment.body = null;
                attachment = new Attachment();
            }

            ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,'File uploaded successfully'));
            return null;
        }  

        PageReference page = ApexPages.currentPage();
        //page.setRedirect(true);
        return page;
     }
}
2
  • If all else fails you can check the value of document type via JS and return false if null preventing the command button action from executing: <apex:commandButton onclick="return validateType();" action="{!save}" value="Upload"/>
    – Eric
    Dec 22, 2016 at 1:18
  • i looked at some of my code that does uploads and I tend to bind the inputFile attributes to transient variables in the controller and then in the save page action method, instantiate an Attachment sobject from the transient variables - then insert.
    – cropredy
    Dec 22, 2016 at 1:47

1 Answer 1

1

I would try removing the "return null" statement in the Exception - I am wondering is that is preventing the finally from executing, and so the attachment never gets set back to new, and is being maintained in the viewstate?

1
  • 1
    A return is the only thing that would stop a finally block from occurring.
    – sfdcfox
    Dec 22, 2016 at 1:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.