I am new to salesforce, i am creating an application with Apex and Visualforce.

when i am trying to insert data in custom object, i get Null Pointer Exception, can some one help me, its very urgent.

Thanks in Advance

My Code:

Visualforce:

<apex:form id="MyFirstform">

  <apex:pageBlock >

      <apex:pageBlockButtons >

          <apex:commandButton action="{!save}" value="Save"/>   

          <apex:commandButton action="{!cancel}" value="Cancel"/>

      </apex:pageBlockButtons>

      <apex:pageBlockSection title="Customer Information" id="informationid" columns="2">

         <apex:outputLabel value="Customer Id: " style="font-weight:bold"></apex:outputLabel>

         <apex:inputText id="custid" />

         <apex:outputLabel value="SSN/Tax ID/Customer Number: " style="font-weight:bold"></apex:outputLabel>

         <apex:inputText id="ssn"/>

         <apex:outputLabel value="Name: " style="font-weight:bold"></apex:outputLabel>

         <apex:inputText id="name"/>

         <apex:outputLabel value="Phone/Cell Number: " style="font-weight:bold"></apex:outputLabel>

         <apex:inputText id="cell"/>

         <apex:outputLabel value="Address: " style="font-weight:bold"></apex:outputLabel>

         <apex:inputText id="address"/>

         <apex:outputLabel value="Email Address: " style="font-weight:bold"></apex:outputLabel>

         <apex:inputText id="email"/>

     </apex:pageBlockSection>

     <apex:pageBlockSection title="Caller Information" id="callerinformid">

         <apex:outputLabel value="Is Caller: "></apex:outputLabel>

         <input type="checkbox" id="check" onclick="jsvalidate()"/>

         <apex:outputLabel value="Caller Name: "></apex:outputLabel>

         <input type="text" id="callername"/>

         <apex:outputLabel value="Relation Type: "></apex:outputLabel>

         <select id="relationtype">

         <option value="Select">--Select--</option>

         <option value="Service">Service</option>

        <option value="Move In">Move In</option>

        <option value="Move Out">Move Out</option>

        <option value="Transfer">Transfer</option>

         </select>

     </apex:pageBlockSection>

    <apex:pageBlockSection title="New Permises / Contract Number" id="contractnum">

         <apex:outputLabel value="Contract Number: "></apex:outputLabel>

         <apex:inputText id="contractnumber"/>

    </apex:pageBlockSection>

    <apex:pageBlockSection title="Services and Dates" id="servdate">

         <apex:outputLabel value="Electricity Permit Required "></apex:outputLabel>

          <input type="checkbox" id="permit" onclick="jsvalidate1()"/>

         <apex:outputLabel value="Turn On All "></apex:outputLabel>

         <input type="checkbox" id="all" onclick="jsvalidate2()"/>

         <apex:outputLabel value="Turn Electricity "></apex:outputLabel>

          <input type="checkbox" id="electric" onclick="jsvalidate2()"/>

         <apex:outputLabel value="Turn Lighting "></apex:outputLabel>

          <input type="checkbox" id="light" onclick="jsvalidate2()"/>

         <apex:outputLabel value="Service Start Date"></apex:outputLabel>

            <input type="text" id="servdate"/>

         <apex:outputLabel value="Meter Number"></apex:outputLabel>

         <input type="text" id="meternum"/>

         <apex:outputLabel value="Rate"></apex:outputLabel>

         <input type="text" id="rate"/>

         <apex:outputLabel value="Remarks"></apex:outputLabel>

         <apex:inputText id="remark"/>

    </apex:pageBlockSection>

</apex:pageBlock>

  </apex:form>  

Apex:

public class UCIP {

    public PageReference cancel() {

        return null;

    }

    private String id{ get; set; }

    private  Integer custid{ get; set; }

    private  Integer ssn{ get; set; }

    private String name{ get; set; }

    private String cell{ get; set; }

    private String address{ get; set; }

    private String email{ get; set; }

    private Integer contractnumber{ get; set; }

    private String callername{ get; set; }

    private String relationtype{ get; set; }

    private Date servstdate{ get; set; }

    private Integer meternum{ get; set; }

    private Integer rate{ get; set; }

    private String remks{ get; set; }

       public PageReference save() {

       Map<string,string> postParameters = ApexPages.currentPage().getParameters();

        try{

          UCIP__c obj= new UCIP__c();

          obj.CustomerId__c = Decimal.valueOf(postParameters.get('custid1'));

          obj.SSN_Tax_ID_Customer_Number__c = Integer.valueOf(postParameters.get('ssn'));

          obj.Name__c = postParameters.get('name');

          obj.Phone_Cell_Number__c = postParameters.get('cell');

          obj.Address__c = postParameters.get('address');

          obj.Email_Address__c = postParameters.get('email');

          obj.Rate__c = Integer.valueOf(postParameters.get('rate'));

          insert obj;

          System.debug('Success');

        }catch(System.DmlException e){

            System.debug(e);

        }

        String newPageUrl = '/apex/ordercontract';

        PageReference newPage = new PageReference(newPageUrl);

        newPage.setRedirect(true);

        return newPage;

   }

}