java - GAE ClassCastException Long cannot be cast to double -

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Datastore Getting exception while trying to get the data to the unit here is my code: 

  Persistence Manager Manager pmf = PMF.get (). GetPersistenceManager (); Try {query query = pmf.newQuery (DocHeader.class); @SuppressWarnings ("uncontrolled") list & lt; DocHeader & gt; docHeaders = (list & lt; DocHeader & gt;) query.execute ();   
 Anyone can help in this issue.  
 Here is my object  
  @PersistenceCapable (identityType = IdentityType.APPLICATION) public class Dokhaider {@PrimaryKey @ Persistent (Manswasthe = Aidijnaretr Sestaktisi. Secvens) Private Long Dokhaideraidi; @ Pricent Private Double Prepayment; @ Private private double current balance; @ Private Private Double Total Account Balance; @printingent private string account retiagentive; @princent private double minapment; }    
 
 
 exception  
 
 ClassCastException no longer Maybe   
 the means to double that saved you have Datastore at least one  DocHeader  unit, where you make it an asset < code> long  number but is referred to as your Java existence you  double  when you want it to query and convert it back into Java class f Week, the effort to transform  long  - & gt;  Double  throws the exception.  
 By using low-level Datastore API you can read all  DocHeader  officials, and  long  properties  double  Should be the first code in the  double , then save those institutions or if existing institutions are not important (for example test data), then delete them.  
 Documentation:

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