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john dsouza NULL pointer exception issue in custom object
Hello
I have a custom object fan which has three fields, email , firstname and lastname , email field being mandatory.
first time when page loads, I append an ID known as encryptedfanID to the browser URL , thereby it loads the respective values into the fields.
so this part is working fine
suppose if I do not append any ID to the URL and hit the save button without entering any valies then it throws error " ateempt to deference a null object" error.
a piece of code explaining the above is provided.
thanks
JohnD
I have a custom object fan which has three fields, email , firstname and lastname , email field being mandatory.
first time when page loads, I append an ID known as encryptedfanID to the browser URL , thereby it loads the respective values into the fields.
so this part is working fine
suppose if I do not append any ID to the URL and hit the save button without entering any valies then it throws error " ateempt to deference a null object" error.
a piece of code explaining the above is provided.
public class PrefCenterCTRL{
//Profile Tab
public String fanLastName { get; set; }
public String fanFirstName { get; set; }
public String fanEmail { get; set; }
public String encryptedfanID{get;set;}
public fan__c fan{get;set;}
public PrefCenterCTRL()
{
try
{
encryptedfanID=ApexPages.currentpage().getparameters().get('id');
system.debug('@@@'+encryptedfanID);
if(String.isBlank(ApexPages.currentPage().getParameters().get('id')))
{
ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,'Error: Invalid Id.');
ApexPages.addMessage(myMsg);
return;
}
else
{
fetchfanvalues();
}
}
catch(Exception e){
ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,e.getMessage());
ApexPages.addMessage(myMsg);
return;
}
}
public void fetchfanvalues()
{
try
{
fan=[SELECT id, Email__c,First_Name__c,Last_Name__c,
FROM fan__c
WHERE Encrypted_ID__c=:encryptedfanID];
if(!string.isBlank(fan.Email__c))
{
fan_email=fan.Email__c;
}
if(!string.isBlank(fan.First_Name__c))
{
fanFirstName=fan.First_Name__c;
}
if(!string.isBlank(fan.Last_Name__c))
{
fanLastName=fan.Last_Name__c;
}
}
public void SaveValues()
{
if(!string.isBlank(fan_email))
{
fan.Email__c=fan_email;
}
if(!string.isBlank(fanMobile))
{
fan.Mobile_Phone__c=fanMobile;
}
if(!string.isBlank(fanFirstName))
{
fan.First_Name__c=fanFirstName;
}
public PageReference btn_profile_saveChanges()
{
SaveValues();
return null;
}
}
<apex:page controller="PrefCenterCTRL"
docType="html-5.0"
showHeader="false" >
<apex:form>
<apex:inputText value="{!fanEmail}" id="email_val"/>
<apex:inputText value="{!fanfirstname}" id="firstname"/>
<apex:inputText value="{!fanLastName}" id="lastname"/>
<apex:commandButton value="SAVE CHANGES"
action="{!btn_profile_saveChanges}" />
<apex:form>
</apex:page>
I hope I am pretty clear, I request the forum membets to kndly help me out.thanks
JohnD
That is because you are not creating instance for fan__C.
Try this code
public class PrefCenterCTRL{ //Profile Tab public String fanLastName { get; set; } public String fanFirstName { get; set; } public String fanEmail { get; set; } public String encryptedfanID{get;set;} public fan__c fan{get;set;} public PrefCenterCTRL() { try { encryptedfanID=ApexPages.currentpage().getparameters().get('id'); system.debug('@@@'+encryptedfanID); fan = new fan__c(); if(String.isBlank(ApexPages.currentPage().getParameters().get('id'))) { ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,'Error: Invalid Id.'); ApexPages.addMessage(myMsg); return; } else { fetchfanvalues(); } } catch(Exception e){ ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,e.getMessage()); ApexPages.addMessage(myMsg); return; } } public void fetchfanvalues() { try { fan=[SELECT id, Email__c,First_Name__c,Last_Name__c, FROM fan__c WHERE Encrypted_ID__c=:encryptedfanID]; if(!string.isBlank(fan.Email__c)) { fan_email=fan.Email__c; } if(!string.isBlank(fan.First_Name__c)) { fanFirstName=fan.First_Name__c; } if(!string.isBlank(fan.Last_Name__c)) { fanLastName=fan.Last_Name__c; } } public void SaveValues() { if(!string.isBlank(fan_email)) { fan.Email__c=fan_email; } if(!string.isBlank(fanMobile)) { fan.Mobile_Phone__c=fanMobile; } if(!string.isBlank(fanFirstName)) { fan.First_Name__c=fanFirstName; } public PageReference btn_profile_saveChanges() { SaveValues(); return null; } } <apex:page controller="PrefCenterCTRL" docType="html-5.0" showHeader="false" > <apex:form> <apex:inputText value="{!fanEmail}" id="email_val"/> <apex:inputText value="{!fanfirstname}" id="firstname"/> <apex:inputText value="{!fanLastName}" id="lastname"/> <apex:commandButton value="SAVE CHANGES" action="{!btn_profile_saveChanges}" /> <apex:form> </apex:page>Let us know if it helps.
Mark it as best answer if it works.
Thanks.
All Answers
That is because you are not creating instance for fan__C.
Try this code
public class PrefCenterCTRL{ //Profile Tab public String fanLastName { get; set; } public String fanFirstName { get; set; } public String fanEmail { get; set; } public String encryptedfanID{get;set;} public fan__c fan{get;set;} public PrefCenterCTRL() { try { encryptedfanID=ApexPages.currentpage().getparameters().get('id'); system.debug('@@@'+encryptedfanID); fan = new fan__c(); if(String.isBlank(ApexPages.currentPage().getParameters().get('id'))) { ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,'Error: Invalid Id.'); ApexPages.addMessage(myMsg); return; } else { fetchfanvalues(); } } catch(Exception e){ ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR,e.getMessage()); ApexPages.addMessage(myMsg); return; } } public void fetchfanvalues() { try { fan=[SELECT id, Email__c,First_Name__c,Last_Name__c, FROM fan__c WHERE Encrypted_ID__c=:encryptedfanID]; if(!string.isBlank(fan.Email__c)) { fan_email=fan.Email__c; } if(!string.isBlank(fan.First_Name__c)) { fanFirstName=fan.First_Name__c; } if(!string.isBlank(fan.Last_Name__c)) { fanLastName=fan.Last_Name__c; } } public void SaveValues() { if(!string.isBlank(fan_email)) { fan.Email__c=fan_email; } if(!string.isBlank(fanMobile)) { fan.Mobile_Phone__c=fanMobile; } if(!string.isBlank(fanFirstName)) { fan.First_Name__c=fanFirstName; } public PageReference btn_profile_saveChanges() { SaveValues(); return null; } } <apex:page controller="PrefCenterCTRL" docType="html-5.0" showHeader="false" > <apex:form> <apex:inputText value="{!fanEmail}" id="email_val"/> <apex:inputText value="{!fanfirstname}" id="firstname"/> <apex:inputText value="{!fanLastName}" id="lastname"/> <apex:commandButton value="SAVE CHANGES" action="{!btn_profile_saveChanges}" /> <apex:form> </apex:page>Let us know if it helps.
Mark it as best answer if it works.
Thanks.
That worked. stupid of me to miss out on that.
thanks very much.
John