Scenario when user enter numbers other than ten digits error should arise.
But above error oscurs
(use this validation WITHOUT REGEX function)

SCENARIO: If Lead Status is "Open - Not Contacted" add to Account else if it is "Working - Contacted" add to Opportunity
trigger AutoQualifyLead2 on Lead (after insert) {
    List<Account> accs=new List<Account> ();
    List<Opportunity> opps=new List<Opportunity> ();
    for(Lead l:Trigger.New)
    {
        if(l.Status=='Open - Not Contacted'){
            Account a=new Account();
            a.Fax=l.Fax;
            a.Phone=l.Phone;
            a.Industry=l.Industry;
            accs.add(a);
        }
        else{
            if(l.Status=='Working - Contacted'){
                Opportunity op=new Opportunity();
                op.Name=l.Name;
                op.Description=l.Description;
                opps.add(op);
            }
        }
    }
    if(accs.size()>0){    insert accs;    }
    if(opps.size()>0){    insert opps;    }
}
ERROR: As seen in attached Image

public class SchemaExample1 {
    public Map<String,Schema.SObjectType> objMap {get;set;}
    public List<SelectOption> objs {set;get;}
    
    public SchemaExample1(){
        objMap=Schema.getGlobalDescribe();
        Set<String> key=objMap.keySet();
        
        objs=new List<SelectOption>();
        for(String s:keys){
            Schema.SObjectType sobj=oldMap.get(s);
            Schema.DescribeSObjectResult res=Sobj.getDescribe();
            SelectOption op=new selectOption(s,s);
            objs.add(op);
        }
    }
}

public class SchemaExample {
    public String result {get;set;}
        
    public SchemaExample(){
5        Schema.DescribeSObjectResult rst=Account.SObjectType.getDescribe();
        result='The obtained Result is:'+rst;
    }
}
Error:Invalid type: Schema.DescribeSObjectResult @ LINE 5

trigger instantTrigger on Opportunity (before insert,after update) {
    List<OpportunityShare> share=new List<OpportunityShare>();
    User u=[SELECT id FROM User WHERE alias='sara'];
    for(Opportunity op:Trigger.New){
        if(op.Type=='New Customer'){
            OpportunityShare so=new OpportunityShare();
            so.OpportunityId=op.id;
            so.OpportunityAccessLevel='Edit';
            so.UserOrGroupId=u.Id;
            so.RowCause='Manual';
            share.add(so);
        }
    }
    insert share;
}

Error:Apex trigger instantTrigger caused an unexpected exception, contact your administrator: instantTrigger: execution of AfterUpdate caused by: System.DmlException: Insert failed. First exception on row 0; first error: INSUFFICIENT_ACCESS_ON_CROSS_REFERENCE_ENTITY, insufficient access rights on cross-reference id: []: Trigger.instantTrigger: line 14, column 1
 

Example

APEXClass
public class CustomSettingsExample {
    public String city {get;set;}
    public String state {set;get;}
    public String code {get;set;}
    
    public void getData(){
        zipcodes__c zip=zipcodes__c.getValues(city);
        state=zip.state__c;
        city=zip.city__c;
        code=zip.code__c;        
    }
}
Related Vfp
<apex:page controller="CustomSettingsExample">
    <apex:form >
    <apex:pageblock title="Table" id="ONE">
        <apex:pageBlockSection >
            <apex:pageBlockSectionItem >
                <apex:outputLabel value="city"/>
                <apex:inputText value="{!city}">
                    <apex:actionSupport event="onchange" action="{!getData}"  reRender="ONE"/>
                </apex:inputText>
            </apex:pageBlockSectionItem>
            <apex:pageBlockSectionItem >
                <apex:outputLabel value="state"/>
                <apex:inputText value="{!state}"/>
            </apex:pageBlockSectionItem>
            <apex:pageBlockSectionItem >
                <apex:outputLabel value="code"/>
                <apex:inputText value="{!code}"/>
            </apex:pageBlockSectionItem>
        </apex:pageBlockSection>
        </apex:pageblock>
            </apex:form>
</apex:page>

ERROR

Apex Class
public class SOQLExample {
    public String type {get;set;}
    public List<Account> accs {set;get;}
    public void getResult(){
        accs=[SELECT id,name FROM Account WHERE Type=:type];
    }
}
Vfp
<apex:page controller="SOQLExample">
    <apex:form >
        <apex:pageBlock title="soql example">
            <apex:outputText value="Enter Type:"/>  
                <apex:inputText value="{!Type}"/>
                <apex:commandButton value="Submit" action="{!getResult}"/>
        </apex:pageBlock>
        <apex:pageBlock title="Result" rendered="{! !ISNULL(accs)}">
            <apex:pageBlockTable value="{!accs}" var="account">
                <apex:column value="{!account.name}"/>
                <apex:column value="{!account.type}"/>
            </apex:pageBlockTable>
        </apex:pageBlock>
            </apex:form>
</apex:page>
What could be the error

Illegal assignment from List<System.SelectOption> to Set<String>  
@Line 15
public class FieldDependencyPickList {
public    Map<String,List<String>> cityMap{get;set;}
    public List<SelectOption> place {set;get;}
    public List<SelectOption> city {set;get;}
    public String selCity    {get;set;}
    public String selPlace    {set;get;}

public FieldDependencyPickList(){
    cityMap=new Map<String,List<String>>();
    List<String> hcityPlaces=new List<String> {'apet','npet','bpet','abpet'};
        List<String> apcityPlaces=new List<String> {'rjy','kkd','tni','vskp'};
            cityMap.put('HYD',hcityPlaces);            
            cityMap.put('AP',apcityPlaces);
                Set<String> place=cityMap.keySet();
L15   place=new List<SelectOption>();
        city=new List<SelectOption>();
        SelectOption so=new SelectOption('none','-None-');
        city.add(so);
        place.add(so);
    for(String p:place){
        SelectOption nsp=new SelectOption(p,p);
        city.add(nsp);
}  
    }
        public void placesGetter(){    
            place.clear();
            List<String> sp=cityMap.get(selcity);
            for(String pp:sp){
                SelectOption so1=new SelectOption(pp,pp);
                place.add(so1);
    }
  }
}

Apex Class
public class MultiselectExample {
    public Set<String> nscities         {Set;get;}
    public Set<String> scities          {set;get;}
    public List<SelectOption> soptions  {set;get;}
    public List<SelectOption> nsoptions   {set;get;}
    public List<String> selected        {set;get;}
    public List<String> removed     {set;get;}
      public MultiselectExample(){
        nscities=new Set<String>{'Hyd','Ban','Pune','Che'};
        scities=new Set<String>();
        soptions=new List<SelectOption>();
        nsoptions=new List<SelectOption>();
        selected=new List<String>();
        removed=new List<String>();
        calloptions();
    }
    public void callOptions(){
        nsoptions.clear();
        soptions.clear();
        if(scities.size()<=0){
            SelectOption p=new SelectOption('none','-None-');
            soptions.add(p);
        }else{
            for(String s1:scities){
                SelectOption op1=new SelectOption(s1,s1);
                soptions.add(op1);
            }
        }
         if(nscities.size()<=0){
            SelectOption p1=new SelectOption('none','-None-');
            nsoptions.add(p1);
        }else{
            for(String s2:nscities){
                SelectOption op2=new SelectOption(s2,s2);
                nsoptions.add(op2);
            }
        }
    }
    public void addElements(){
        nscities.removeAll(selected);
        scities.addAll(selected);
        calloptions();
    }
    public void removeElements(){
       scities.removeAll(removed);
       nscities.addAll(removed);
        calloptions();
    }
}

VIsualForce
<apex:page controller="MultiselectExample">
    <style>
        .mylist{
            width:100px;
            height:80px;
        }
    </style>
    <apex:form >
        <apex:pageBlock title="MultiSelect Example" >
            <apex:panelGrid columns="3" id="one">
                <apex:selectList multiselect="true" value="{!selected}" styleclass="mylist">
                    <apex:selectOptions value="{!nsoptions}" />
                </apex:selectList>
                <apex:panelGrid columns="1">
                    <apex:commandButton value="Add" action="{!addElements}" reRender="one" />    <br/>
                    <apex:commandButton value="Del" action="{!removeElements}" reRender="one" />
                </apex:panelGrid>
                <apex:selectList multiselect="true" value="{!removed}" styleclass="mylist">
                    <apex:selectOptions value="{!soptions}" />
                </apex:selectList>   
            </apex:panelGrid>
        </apex:pageBlock>
    </apex:form>
</apex:page>

The output for this is as below


But if i selected none at right & click delete then it is added to the left as below.

So how to write rewrite code so that when i select none at the right & delete it, then it should not add to the left (i.e to the non-selected options)

System.NullPointerException: Attempt to de-reference a null object Class.CourseWrapperList.<init>: line 10, column 1
SCENARIO: Create List of PickList options based on the courses available in the list?
And My Code for this is as below

CourseWrapper.apxc
public class CourseWrapper {
    public String cname {set;get;}
    public String ccode {get;set;}
    public CourseWrapper(String cname,String ccode)
    {
        this.cname=cname;
        this.ccode=ccode;
    }
}

CourseWrapperList.apxc
public class CourseWrapperList {
    public List<SelectOption> selected {set;get;}
    public List<CourseWrapper> courses {get;set;}
    CourseWrapper c1=new CourseWrapper('None','n');
    CourseWrapper c2=new CourseWrapper('Java','j-01');
    CourseWrapper c3=new CourseWrapper('Sfdc','sf-01');
    CourseWrapper c4=new CourseWrapper('Oracle','o-01');
    CourseWrapper c5=new CourseWrapper('Dotnet','dn-01');
    public CourseWrapperList(){
    courses.add(c1);
    courses.add(c2);
    courses.add(c3);
    courses.add(c4);
    courses.add(c5);
        so();
       }
    public pageReference so(){
    List<SelectOption> options=new List <SelectOption>();
        for(CourseWrapper c:courses){
        SelectOption op=new SelectOption(c.cname,c.ccode);
        options.add(op);
    }
          return null;
  }
}

CourseWrapperVfp.vfp
<apex:page controller="CourseWrapperList">
    <apex:form>
        <apex:pageBlock title="Courses">
            <apex:selectList value="{!selected}">
                <apex:selectOptions value="{!courses}"/>
            </apex:selectList>
        </apex:pageBlock>
        {!selected}
    </apex:form>
</apex:page>

But following (Image) Visualforce page error occurs. What is the error, How & why it occurs & how to overcome it?

When Execute is clicked error comes as below

Line: 1, Column: 17
Constructor not defined: [ConsWithPara].<Constructor>()

What is the usage of var name in script, i mean like below?

<apex:page controller="RemoteExample" id="page">
    <script>
        var name;
    </script>
</apex:page>
 

How to know the API names of fields of a Standard Objects like Accounts, Contacts etc & what's the navigation to view the API names of fields of standard objects

How to bind Account Name in Accounts?

<apex:page controller="Person">

        <apex:sectionHeader id="Own_VisualForce" title="Student Twin" subtitle="New Twin Student"
                        description="This is the VisualForce page of Student object"
                        help="/apex/MyVisualForcePage"
                        printUrl="https://c.ap2.visual.force.com/apex/Own?core.apexpages.request.devconsole=1"/>
    <apex:form >
    <apex:pageBlock id="OwnPageblock" title="Student Edit" tabStyle="Opportunity" dir="LTR" helpTitle="Any Help?"
                    helpUrl="https://ap2.salesforce.com/_ui/core/userprofile/UserProfilePage"
                    mode="inline edit" rendered="true" lang="en-IN">
   
        <apex:pageBlockButtons id="Own_pbb" title="PageBlockButtons" dir="LTR" lang="en-US" rendered="true" >
            <apex:commandButton value="Save"/>
            <apex:commandButton value="Save & New"/>
            <apex:commandButton value="cancel" />
            
        <apex:pageBlockSection collapsible="false" columns="4" rendered="true">
            <apex:inputField value="{!Person.Person_Name}"/>
            <apex:inputField value="{!Person.Course}"/>
            <apex:inputField value="{!Student.Country}"/>     

</apex:pageBlockSection>
        </apex:pageBlockButtons>
    </apex:pageBlock>
    </apex:form>
</apex:page>

What's wrong in the above program (ERROR in Line 0 --> Unknown property 'Person.Person') & i'm trying to get the fields of a custom obj named "Person" as shown in the above picture. How to write a class with set & get

<apex:page controller="Person">

        <apex:sectionHeader id="Own_VisualForce" title="Student Twin" subtitle="New Twin Student"
                        description="This is the VisualForce page of Student object"
                        help="/apex/MyVisualForcePage"
                        printUrl="https://c.ap2.visual.force.com/apex/Own?core.apexpages.request.devconsole=1"/>
    <apex:form >
    <apex:pageBlock id="OwnPageblock" title="Student Edit" tabStyle="Opportunity" dir="LTR" helpTitle="Any Help?"
                    helpUrl="https://ap2.salesforce.com/_ui/core/userprofile/UserProfilePage"
                    mode="inline edit" rendered="true" lang="en-IN">
   
        <apex:pageBlockButtons id="Own_pbb" title="PageBlockButtons" dir="LTR" lang="en-US" rendered="true" >
            <apex:commandButton value="Save"/>
            <apex:commandButton value="Save & New"/>
            <apex:commandButton value="cancel" />
            
        <apex:pageBlockSection collapsible="false" columns="4" rendered="true">
            <apex:inputField value="{!Person.Person_Name}"/>
            <apex:inputField value="{!Person.Course}"/>
            <apex:inputField value="{!Student.Country}"/>     

</apex:pageBlockSection>
        </apex:pageBlockButtons>
    </apex:pageBlock>
    </apex:form>
</apex:page>
            
What's wrong in the above program (ERROR in Line 0 --> Unknown property 'Person.Person') & i'm trying to get the fields of a custom obj named "Person" as shown in the above picture. How to write a class with set & get.

How to write a formula for an Invoice field, so that IF YOU SELECT INVOICE STATUS AS OPEN & SAVED IT THEN IT HAS TO BE SAVED AS SAY For Example  "INV-{0001} OPEN". So, that if you select Invoice from lookup from line item you come to know the status of it whether it is OPEN or CLOSED or anything by viewing it.

 

System.NullPointerException: Attempt to de-reference a null object

public class StudentNew 
{
    public string name;
    public static decimal fee=10000;
    
    public void setData(string name)
    {
        this.name=name;
        fee=fee+1000;
    }
    
    public static getData(decimal fee)
    {
        fee=fee+5000;
    }
}

This generates error "Duplicate variable fee". bt if i change fee to another word in getData method it says constructor cannot have static (but it is not constructor is it). am i doing it wrong or if so correct me. Please reply

How to know the API names of fields of a Standard Objects like Accounts, Contacts etc & what's the navigation to view the API names of fields of standard objects

public class SchemaExample {
    public String result {get;set;}
        
    public SchemaExample(){
5        Schema.DescribeSObjectResult rst=Account.SObjectType.getDescribe();
        result='The obtained Result is:'+rst;
    }
}
Error:Invalid type: Schema.DescribeSObjectResult @ LINE 5

Illegal assignment from List<System.SelectOption> to Set<String>  
@Line 15
public class FieldDependencyPickList {
public    Map<String,List<String>> cityMap{get;set;}
    public List<SelectOption> place {set;get;}
    public List<SelectOption> city {set;get;}
    public String selCity    {get;set;}
    public String selPlace    {set;get;}

public FieldDependencyPickList(){
    cityMap=new Map<String,List<String>>();
    List<String> hcityPlaces=new List<String> {'apet','npet','bpet','abpet'};
        List<String> apcityPlaces=new List<String> {'rjy','kkd','tni','vskp'};
            cityMap.put('HYD',hcityPlaces);            
            cityMap.put('AP',apcityPlaces);
                Set<String> place=cityMap.keySet();
L15   place=new List<SelectOption>();
        city=new List<SelectOption>();
        SelectOption so=new SelectOption('none','-None-');
        city.add(so);
        place.add(so);
    for(String p:place){
        SelectOption nsp=new SelectOption(p,p);
        city.add(nsp);
}  
    }
        public void placesGetter(){    
            place.clear();
            List<String> sp=cityMap.get(selcity);
            for(String pp:sp){
                SelectOption so1=new SelectOption(pp,pp);
                place.add(so1);
    }
  }
}

System.NullPointerException: Attempt to de-reference a null object Class.CourseWrapperList.<init>: line 10, column 1
SCENARIO: Create List of PickList options based on the courses available in the list?
And My Code for this is as below

CourseWrapper.apxc
public class CourseWrapper {
    public String cname {set;get;}
    public String ccode {get;set;}
    public CourseWrapper(String cname,String ccode)
    {
        this.cname=cname;
        this.ccode=ccode;
    }
}

CourseWrapperList.apxc
public class CourseWrapperList {
    public List<SelectOption> selected {set;get;}
    public List<CourseWrapper> courses {get;set;}
    CourseWrapper c1=new CourseWrapper('None','n');
    CourseWrapper c2=new CourseWrapper('Java','j-01');
    CourseWrapper c3=new CourseWrapper('Sfdc','sf-01');
    CourseWrapper c4=new CourseWrapper('Oracle','o-01');
    CourseWrapper c5=new CourseWrapper('Dotnet','dn-01');
    public CourseWrapperList(){
    courses.add(c1);
    courses.add(c2);
    courses.add(c3);
    courses.add(c4);
    courses.add(c5);
        so();
       }
    public pageReference so(){
    List<SelectOption> options=new List <SelectOption>();
        for(CourseWrapper c:courses){
        SelectOption op=new SelectOption(c.cname,c.ccode);
        options.add(op);
    }
          return null;
  }
}

CourseWrapperVfp.vfp
<apex:page controller="CourseWrapperList">
    <apex:form>
        <apex:pageBlock title="Courses">
            <apex:selectList value="{!selected}">
                <apex:selectOptions value="{!courses}"/>
            </apex:selectList>
        </apex:pageBlock>
        {!selected}
    </apex:form>
</apex:page>

But following (Image) Visualforce page error occurs. What is the error, How & why it occurs & how to overcome it?

Hi. I am new to salesforce, in fact to development itself. Do I need prior dev experience to learn salesforce or can I start learning it from scratch easily? If I can begin, can you provide a step a step guide like from where I should start etc.?

How to bind Account Name in Accounts?

<apex:page controller="Person">

        <apex:sectionHeader id="Own_VisualForce" title="Student Twin" subtitle="New Twin Student"
                        description="This is the VisualForce page of Student object"
                        help="/apex/MyVisualForcePage"
                        printUrl="https://c.ap2.visual.force.com/apex/Own?core.apexpages.request.devconsole=1"/>
    <apex:form >
    <apex:pageBlock id="OwnPageblock" title="Student Edit" tabStyle="Opportunity" dir="LTR" helpTitle="Any Help?"
                    helpUrl="https://ap2.salesforce.com/_ui/core/userprofile/UserProfilePage"
                    mode="inline edit" rendered="true" lang="en-IN">
   
        <apex:pageBlockButtons id="Own_pbb" title="PageBlockButtons" dir="LTR" lang="en-US" rendered="true" >
            <apex:commandButton value="Save"/>
            <apex:commandButton value="Save & New"/>
            <apex:commandButton value="cancel" />
            
        <apex:pageBlockSection collapsible="false" columns="4" rendered="true">
            <apex:inputField value="{!Person.Person_Name}"/>
            <apex:inputField value="{!Person.Course}"/>
            <apex:inputField value="{!Student.Country}"/>     

</apex:pageBlockSection>
        </apex:pageBlockButtons>
    </apex:pageBlock>
    </apex:form>
</apex:page>

What's wrong in the above program (ERROR in Line 0 --> Unknown property 'Person.Person') & i'm trying to get the fields of a custom obj named "Person" as shown in the above picture. How to write a class with set & get

<apex:page controller="Person">

        <apex:sectionHeader id="Own_VisualForce" title="Student Twin" subtitle="New Twin Student"
                        description="This is the VisualForce page of Student object"
                        help="/apex/MyVisualForcePage"
                        printUrl="https://c.ap2.visual.force.com/apex/Own?core.apexpages.request.devconsole=1"/>
    <apex:form >
    <apex:pageBlock id="OwnPageblock" title="Student Edit" tabStyle="Opportunity" dir="LTR" helpTitle="Any Help?"
                    helpUrl="https://ap2.salesforce.com/_ui/core/userprofile/UserProfilePage"
                    mode="inline edit" rendered="true" lang="en-IN">
   
        <apex:pageBlockButtons id="Own_pbb" title="PageBlockButtons" dir="LTR" lang="en-US" rendered="true" >
            <apex:commandButton value="Save"/>
            <apex:commandButton value="Save & New"/>
            <apex:commandButton value="cancel" />
            
        <apex:pageBlockSection collapsible="false" columns="4" rendered="true">
            <apex:inputField value="{!Person.Person_Name}"/>
            <apex:inputField value="{!Person.Course}"/>
            <apex:inputField value="{!Student.Country}"/>     

</apex:pageBlockSection>
        </apex:pageBlockButtons>
    </apex:pageBlock>
    </apex:form>
</apex:page>
            
What's wrong in the above program (ERROR in Line 0 --> Unknown property 'Person.Person') & i'm trying to get the fields of a custom obj named "Person" as shown in the above picture. How to write a class with set & get.

 

public class StudentNew 
{
    public string name;
    public static decimal fee=10000;
    
    public void setData(string name)
    {
        this.name=name;
        fee=fee+1000;
    }
    
    public static getData(decimal fee)
    {
        fee=fee+5000;
    }
}

This generates error "Duplicate variable fee". bt if i change fee to another word in getData method it says constructor cannot have static (but it is not constructor is it). am i doing it wrong or if so correct me. Please reply

Hi, there. I have a custom obj named "Student", in that i have field named "Country", so whenever a new student is created i want the country field has to be entered automatically. How can i write trigger for that?

AND(Price__c>15,Quantity__c>4)
This Validation rule accepts Price bt won't accept Quantity as shown in image attached.
Is this formula correct or suggest me formulas for making it valid.