ObjectGroup and NonPersistableObjectException

Similar Questions

• How do I solve the NonPersistableObjectException

  I have a method that is simple, written in the form:

  Public Shared Sub set (long uniqueId, String value) {}
  Store = PersistentStore.getPersistentObject (uniqueId);
  synchronized (store) {}
  store.setContents (value);
  Store.Commit ();
  }
  }

  This method works very well for the first time, but the second time, it will fail with NonPersistableObjectException.

  Point to be noted is that same unique identification number, I'm updating with the same value.

  You have created an object that extends the string that you store?  If so, you will need to implement Persistable in this object.

  Your own object is also a good idea.  But there is a problem with persistent objects when you upgrade the.  Say, you create an object as follows:

  class MyPersistentObject extends Persistable {}

  String _string1 = null;

  String _string2 = null;

  ....

  String getString1() {}

  Return _string1;

  }

  ...

  }

  Now for V2, you want to add another string, so you must

  class MyPersistentObject extends Persistable {}

  String _string1 = null;

  String _string2 = null;

  String _string3 = null;

  ....

  String getString3() {}

  Return _string3;

  }

  ...

  }

  Now because you have changed the structure of this persistent object, you actually have the persistent class on the incompatible device with your upgrade.  To install, users will have to delete the old application, lose the stored data.

  However if you did to begin with:

  class myPersistedObject extends IntHashTable implements Persistable {}

  ...

  String getString1() {}

  Return this.get (1);

  }

  ....

  }

  Then to add another channel, you simply add the get method:

  class myPersistedObject extends IntHashTable implements Persistable {}

  ...

  String getString3() {}

  Return this.get (3);

  }

  ....

  }

  The structure does not change and it is compatible.

  The above code is NOT correct, I hope you get the idea.

  Then create your own class, but extends a Collection object and you get the flexibility and scalability.

  Hope it makes sense.

• NonPersistableObjectException

  Hi people,

  I get this error on the subject, when I try to open an httpconnection, strange isn't? rsrs... under my PersistenceClass:

  [code]

  package mypackage;
  import net.rim.device.api.system.PersistentObject; import net.rim.device.api.system.PersistentStore;
  Class DataPersistance {}
  Private Shared DataPersistance dataPersistance;    private static PersistentObject persistentObject.    settingsTable private static Hashtable;
  Continue the implementation... private DataPersistance() {}
  Hash of examples.persistentstore.
  persistentObject = PersistentStore.getPersistentObject (0xc80c1e32);
  {Synchronized (persistentObject)}
  settingsTable = persistentObject.getContents () (Hashtable);        If (null == settingsTable) {settingsTable = new Hashtable();            persistentObject.setContents (settingsTable);            persistentObject.commit ();        }        // }    }
  public {get {Object (String key) {/ / settingsTable = persistentObject.getContents () (Hashtable);}}}        Return settingsTable.get (key);    }
  public void set (String key, Object value) {if (value == null) {settingsTable.remove (key);}        } else {settingsTable.put (key, value);        }
  }
  public void commit() {try {synchronized (persistentObject) {persistentObject.setContents (settingsTable);}                persistentObject.commit ();            }
  } catch (System.Exception e) {e.printStackTrace ();            System.out.println ("PERSISTENCE of EXCEPTION:" + e.getClass () + "" + e.getMessage ());        }    }
  public static DataPersistance getInstance() {if (dataPersistance! = null) {System.out.println ("retornando um DataPersistance ja existente.");}            Return dataPersistance;        } else {System.out.println ("instanciando um DataPersistance.");            dataPersistance = new DataPersistance();            Return dataPersistance;        }    }
  }

  [/ code]

  Why get this error on a COnnection.open? I don't have to commit to anything, don't getContents();

  Thank you

  I am very confused.  If you don't keep all objects, so how can you have a NonPersistableObjectException?

  We see in the code that you create an empty hash table and it is persistent.  Hashtable is persistent.  So this will not cause your problem.  So it seems logical that you have in fact, directly or not, add an object to the list of objects to be persisted.  You can do this without knowing it.  If you add the object to the hash table and object has a reference to object B, then it will also persist object B.  A, otherwise it won't be able to recreate the object A.  Now maybe object A is Persistable (like the hash table) but is not object B.  This causes the problem.

  So, as I said before you have to go through all the ' together do you and know what objects you are directly and indirectly adding to PersistentStore.

  I have another change of code to suggest that, in my opinion, could well help to find this problem.  in your

  Public Sub set (...)

  method, add a call to commit.  This will attempt to commit as soon as you add an object.  And you will likely (but not guaranteed to be 100%) to have this failure on the object that you add, and that is not persistent.

  I do not understand why you have given us your connection class.  What is there to do with the problem?

  Finally, if you hover over the icons in the tool bar layout you see when you create a message, you will see tooltips.  Icons will say "Insert Code".  Press and paste the code into the window that opens.  Do it after you have checked your post, as it used to be that the spellcheck spoiled some of the formatting of the code.

• NonPersistableObjectException on commit () [code]

  I use the following data record to store relevant data as a persistent object:

  [code]

  Import packages
  Net.rim.device.api.util import. *;
  Import Java.util;

  / public class SentBM_Data implements Persistable
  {
  Private members
   
  Public members
  public int ID;
  public boolean initialized = false;
  public int PIN;
  public Vector storedPackets;         Datagram
  public Vector brokenServer;          Byte]
   
  Builders
  public SentBM_Data)
  {
  for (int count = 0; count)< 50;="">
  {
  Debugging
  System.out.println ("created data object");
  }
      
  storedPackets = new Vector (1, 1);
  brokenServer = new Vector (1, 1);
  }
   
  public SentBM_Data (int boxID)
  {
  Debugging
  System.out.println ("created data object");
      
  storedPackets = new Vector (1);
  brokenServer = new Vector (1, 1);
      
  ID = boxID;
  }
   
  public static generateID Sub)
  {
  TODO: Check in with the BlackBerry PIN
  TODO: set the ID field to the returned boxID (default if PIN invalid)
  }
   
  public String toString)
  {
  String content = "";
      
  content += "case ID:"+ ID + "\n"; '.
  content += "Initialized?:" + initialized + "\n"; "."
  content += "PIN:" + PIN + "/ n"; "."
  content += "Unbuilt stored packages:"+ brokenServer.size () + "\n"; '.
  content += "built the stored packages:"+ storedPackets.size () + "\n"; '.
      
  return the content;
  }
  }

  [/ code]

  I have an appData global object of the type SentBM_Data in which I make the changes and use the following code to commit the changes:

  [code]

  synchronized (BSMData)
  {
  BSMData.setContents (appData);
  BSMData.commit ();
  }

  [/ code]

  For some reason any him commit this change started recently throw a NonPersistableObjectException, even a new run (flash memory at the start of simulator of compensation). I was getting this error before, and I've changed anything which involves the recording of the above data and receive this error message. Any ideas?

  Current Simulator: Bold 9000

  EDIT: I should mention that I use Eclipse version 3.4.1 with plugin 1.0.0.67 version

  Make a differential diagnosis in commenting on the two carriers first and see if you can store the object.

  If it works, comment in the vector with the Byte [] and if it works comment back of the vector with the object of datagram, if it fails, then you know why.

  Looking through the JavaDoc, you will find the following elements of the Persistable interface

  A class must explicitly implement this interface for the system store instances of the persistent class. Make the subfamily (s) not inherit implementation of this interface.

  Class DatagramBase (that implements the datagram that implements Persistable new) does not implement explicitly Persistable not it he inherited only from its super class DataBuffer, which means according to the JavaDoc comment above, that DatagramBase objects are not persitable.

• Where to apply for ObjectGroup on an object persist with a table structure? Level line or set of table?

  Hi, expert,

  We have a class like this structure to store a table like structure in the persistent store:

  class {} table

  Vector lines; vector line, each line is another vector for the columns.

  PrimaryKeyMaps Hashtable;

  String tableName;

  }

  We know that we should use ObjectGroup to save persisent object handle. Right now, I use the group for each line vector object (all columns in a row are grouped). If each line would consume only a handful of persistent object. I guess I should group the primaryKeyMaps as well. However I wonder if I need to group them at the level of the entire table or not, because if there are 50 rows to the table, I would use 50 handler object persistent for all these lines. Managers how persisetent demand would be reasonably use in general? What is a good balance between performance and keeping the persistent object handles?

  I use a very similar structure to store Tables in PersistentStore, and I grouped by row (I do not use Group objects, I essentially to serialize the row)... But that's all.  And I have a large number of lines in a number of tables, certainly more than 10,000 usually.  Works very well.

  Persistent used to be a big problem, but I think you'll find that it isn't now, so unless you are targeting devices used (pre OS 4.6), or you have more than 10 s of thousands of lines, then I think that the structure, you are currently to assistance is therefore probably good enough.  And if you become big, you should probably move the data to SQLite.

  I'm a little concerned by the hash table you mind, I have not this and it is more than double the number of persistent Handles because you have an object for the key and the value.  have you looked to optimize this, perhaps using an intHashTable to kill using object?

  But if you are looking for where you will not store 10s of thousands and thousands of lines, I think what you do is very well.

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  I want to do is buy a new ipod touch 128 GB and add new music without synchronizing the entire library to it... I have 2 ipods in conjunction with the other copies of the other.

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  http://www.Apple.com/icloud/photos/

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