bug using the list and treeset

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• Cache.get (Object) when using the list and Arrays.asList as keys

  Hello
  
  I saw a problem when doing the cache.get (object) with the list. Here's my test.
  
  NamedCache cohCache = CacheFactory.getCache ("Test");
  
  Key is a list
  Key list = new ArrayList();
  Key.Add ("A");
  
  cohCache.put (key, 1);
  
  System.out.println ("Get with Arrays.asList:" + cohCache.get (Arrays.asList ("A")));
  System.out.println ("list:" + cohCache.get (key));
  System.out.println ("list is equal to Arrays.asList:" + Arrays.asList("A").equals (key));
  
  Actual output:
  
  Get with Arrays.asList: null
  List is equal to Arrays.asList: true
  Download list: 1
  
  Expected results:
  
  Get with Arrays.asList: 1
  List is equal to Arrays.asList: true
  Download list: 1
  
  
  Arrays.asList("A") and the key are equal but consistency does not return the value. I thought that, in cache.get (object) consistency returns if object.equals (key) is true.
  
  Any idea?
  
  Reg
  
  Fatou.

  Dasun.Weerasinghe wrote:
  Hello

  I saw a problem when doing the cache.get (object) with the list. Here's my test.

  NamedCache cohCache = CacheFactory.getCache ("Test");

  Key is a list
  Key list = new ArrayList();
  Key.Add ("A");

  cohCache.put (key, 1);

  System.out.println ("Get with Arrays.asList:" + cohCache.get (Arrays.asList ("A")));
  System.out.println ("list:" + cohCache.get (key));
  System.out.println ("list is equal to Arrays.asList:" + Arrays.asList("A").equals (key));

  Actual output:

  Get with Arrays.asList: null
  List is equal to Arrays.asList: true
  Download list: 1

  Expected results:

  Get with Arrays.asList: 1
  List is equal to Arrays.asList: true
  Download list: 1

  Arrays.asList("A") and the key are equal but consistency does not return the value. I thought that, in cache.get (object) consistency returns if object.equals (key) is true.

  Any idea?

  Reg

  Fatou.

  Hi Eric,.

  There is a slight misunderstanding in how you think that the works of coherence.

  For clustered caches Coherence does not return the value of the object key of equals to the key specified when caching, object instead, it returns When serialized forms of the key used to and used to get equal to one another.

  If you use no POF, then most of the time Java serialization is used to serialize the objects of key, and in any case if you don't use of POF, and the name of the serialized object class is in the serialized form.

  Now, the thing is that the key that you put in is a java.util.ArrayList. The key that you have tried to get with is a java.util.Arrays.ArrayList.
  It's two different classes, so the serialized forms that store the name of class implementation (which is true in this case) cannot be the same. So consistency is not going to put initially entrance the key that it uses (the serialized form) is actually different from the original key, so there is no entry for the key used in the get() method, and correctly you get back null.

  On the other hand, the two implementations ArrayList implement equals as defined in AbstractList, requiring not only the types of implementation of lists be the same, they apply just that the relation to the object is also a list, so two lists containing the same elements in the same order are equal as long as equals() on AbstractList is concerned, that's why your equals() check evaluates to true even if the types of implementation are different.

  Best regards

  Robert

  Published by: robvarga on May 2, 2012 11:44

• Using the MF and the "open a new tab" + sign opens a new page with a list of site visited recently, which is a very useful tool. It works fine on my two desktop computers, but

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• Question in cooperation with af:iterator and by program (add and delete records using the list)

  In our application, we try to add and delete records within a one: iterator lie to the backing bean list table.

  According to the feature remove should not fire any validation form so we are settign Remove button including the immediate property. And add can throw validation before adding a new record.

  Here the problem comes with button Delete with activated immeidate.  The deletions list action recording is removed from the collection list at the beacking bean, but after that the interface iterator partial page refresh user displays with bad Recordset. Some how instead of getting the last recordings of server of the user interface displays the previous local values for input components.

  For example: if I have 5 files in the list and delete record 2nd of collection. Backing bean (server side) the 2nd record is perfectly removal of list collection.

  On the user interface, the iterator 4 records are displayed as the size of the list is 4, but instead of 2nd record the last record is not rendered. According to my understanding, as deleting comme la suppression touche key is set immediately then the some how these recordings (genereted the Id of component runtime inside the i1: 0:it1 etc...) Apply request vandekerckhove is not updated gettign, Hene showing the old local values inplace of these components of entry and this behavior is only for input components.

  Can you suggest me a solution more come to the question above. Delete with immediate should unregister correspondent and only the record deleted if pannals UI.

  JSFF code

  <af:panelGroupLayout id="pgl1" binding="#{viewScope.formBB.mainPGL}">
          <af:iterator id="i1" value="#{viewScope.formBB.allEmployees}"
                       var="emp" rows="0" varStatus="vs"
                       binding="#{viewScope.formBB.iteratorBinding}">
            <af:panelFormLayout id="pfl1" maxColumns="4" rows="1" labelAlignment="top">
              <!--<af:outputText value="#{vs.index}" id="ot1"/>-->
              <af:inputText label="First Name" id="it1" value="#{emp.firstName}"
                            autoSubmit="true" required="true"/>
              <af:inputText label="Last Name" id="inputText1"
                            value="#{emp.lastName}" autoSubmit="true"
                            required="true"/>
              <af:commandImageLink text="Delete" id="cil1"
                                   immediate="true"
                                   actionListener="#{viewScope.formBB.deleteEmployee}">
                <f:attribute name="index" value="#{vs.index}"/>
              </af:commandImageLink>
            </af:panelFormLayout>
          </af:iterator>
          <af:commandButton text="Add New Employee" id="cb1"
                            actionListener="#{viewScope.formBB.addNewEmployee}"/>
          <af:spacer width="10" height="10" id="s1"/>
  </af:panelGroupLayout>
  

  Delete the Action listener for the bean

  private List <Employee> allEmployees;
  public List getAllEmployees() {
          return allEmployees;
      }
      
  public void deleteEmployee(ActionEvent actionEvent) {
          int index = (Integer) actionEvent.getComponent().getAttributes().get("index");
          if(allEmployees != null && allEmployees.get(index) != null) {
              System.out.println("Emploeye Name:" + allEmployees.get(index).getFirstName());
              allEmployees.remove(index);
          }
          //AdfFacesContext.getCurrentInstance().addPartialTarget(mainPGL);
          AdfFacesContext.getCurrentInstance().addPartialTarget(iteratorBinding);
              
      }
  public void addNewEmployee(ActionEvent actionEvent) {       
          Employee addE = new Employee();
          if(allEmployees != null) {
              allEmployees.add(addE);
          }
          else {
              allEmployees = new ArrayList <Employee>();
              allEmployees.add(addE);
          }
          AdfFacesContext.getCurrentInstance().addPartialTarget(mainPGL);     
      }
  

  Jdev version - Build JDEVADF_11.1.1.7.0_GENERIC_130226.1400.6493

  POC Application - https://drive.google.com/file/d/0BysBrGAsXoo0Qjh3VGkzZkRGck0/view?usp=downalod

  Help, please.

  You probably need to reset submitted values.

  For this, you can use this util class: ResetUtils (reference Java APIs for Oracle ADF Faces)

  For example: ResetUtils.reset (iteratorBinding);

  BTW, you should never bind components to bean managed with a scope greater than the scope of the request.

  Dario

• Relationship between the list and ListField...

  Hey people of Java...

  I can't thank you enough for your answers because I'm really starting to "grok" the paradigm of Java.

  Another came today I'm having problems understanding I deconstruct this app MemoryDemo...

  In the screen of the demo is these two lines:

  Get and display the list of customers.
  _customerList = CustomerList.getInstance ();
  _customerListField = new MyListField (_customerList.getNumCustomerRecords ());

  Well, now I understand the first line perfectly. She develops an object with the contents of the customers it contains.

  The second line calls a custom ListField routine that I show below:

  the final private class MyListField extends ListField
  {
  public MyListField (int numEntries)
  {
  Super (numEntries);
  }

  }

  Here is the part that I don't understand:

  It seems to appeal to both the MyListField() and the super() is simply the NUMBER of elements required, but not * that * list to use.  Exactly how is MyListField() or super() knows how to use the list of customers?  I ask because this exact routine is used a few lines more later (in the part of the main screen) to do the same thing for a list of the records of the order - even once without any reference to which list to use.

  It doesn't seem to be an explicit connection or the relationship between the _customerList and ListField is building.  Is somehow deconstruct '_customerList.getNumCustomerRecords ()' to its root and use _customerList somehow?  I don't think that I changed the call to this:

  _customerListField = new MyListField (_customerList.getNumCustomerRecords ());
  _customerListField = new MyListField (PICK_A_NUMBER);

  Where the constant is: public private static final int PICK_A_NUMBER = 50;

  And he ALWAYS displays a list of customers (though now with only 50 files).  How to do know?

  Thanks in advance!

  -John

  "I guess that somewhere in the interior architecture of the ListField, he knows that he has to paint the whole - one at a time - when put on the screen - that's it."

  Fix.

  This is the great thing about ListField.  It attracts only those who are on the screen.  If you use ListField draw a list of 10,000 rows (I tested), and it will only extract and draw the 10 that he needs.

  "Again, I don't find any explicit loop where it is through each element and then calling drawListRow()."

  Good yet once, it is not there.

  "Maybe one day I'll be able to pay it back here."

  It would be great.

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