Strange deadlock in multithreaded application

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• Strange ClassCastException ADF Mobile application

  Hello experts,

  I use JDev 11.1.2.4

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  package com.accmee.mobile.supplier;

  import com.accmee.mobile.pojo.ServiceCategory;

  import com.acme.structure.util.datalist.SimpleListSupplier;

  import java.util.ArrayList;

  to import java.util.Collection;

  import java.util.List;

  Import javax.el.MethodExpression;

  Import oracle.adfmf.framework.api.AdfmfJavaUtilities;

  Import oracle.adfmf.javax.faces.model.SelectItem;

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  {

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  {

  Super (blankItemApplied);

  }

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  {

  Super();

  }

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  {

  Try

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  }

  catch (System.Exception e)

  {

  e.printStackTrace ();

  }

  }

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  {

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  }

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  for (int i = 0; i < list.size (); i ++)

  {

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  selectItem = getConvertedToSelectItem (superEntity);

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  }

  Return convertedCollection;

  }

  public static getConvertedToSelectItem (superEntity ServiceCategory) SelectItem

  {

  SelectItem selectItem = new SelectItem();

  selectItem.setLabel (superEntity.getName ());

  selectItem.setValue (superEntity);

  return selectItem;

  }

  }

  I had to change my approach. So, I changed returnType loadCategories method for GenericType instead of my custom class.

  Then it worked like that.

  SerializableAttribute public class ServiceCategorySupplier extends SimpleListSupplier

  {

  public ServiceCategorySupplier (boolean blankItemApplied)

  {

  Super (blankItemApplied);

  }

  public ServiceCategorySupplier()

  {

  Super();

  }

  Public Sub loadList()

  {

  Try

  {

  MethodExpression = me AdfmfJavaUtilities.getMethodExpression ("#{applicationScope.loginBean.loadCategories}", List.class, new class [] {});

  List categories = (List) me.invoke (AdfmfJavaUtilities.getAdfELContext (), new Object [] {});

  list.addAll (categories);

  loadItemList();

  }

  catch (System.Exception e)

  {

  e.printStackTrace ();

  throw new AdfException (e.getMessage (), AdfException.ERROR);

  }

  }

  Public Sub loadItemList()

  {

  SelectItem selectItem = null;

  itemList = new SelectItem [list.size ()];

  ServiceCategory serviceCategory = null;

  for (int i = 0; i)<>

  {

  GenericType (GenericType) = list.get (i) serviceCategoryType;

  serviceCategory (ServiceCategory) = GenericTypeBeanSerializationHelper.fromGenericType (ServiceCategory.class, serviceCategoryType);

  selectItem = getConvertedToSelectItem (serviceCategory);

  itemList [i] = selectItem;

  }

  }

  public static getConvertedToSelectItem (superEntity ServiceCategory) SelectItem

  {

  SelectItem selectItem = new SelectItem();

  selectItem.setLabel (superEntity.getName ());

  selectItem.setValue (superEntity.getId ());

  return selectItem;

  }

  public String getListName()

  {

  return of the 'categories ';

  }

  }

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• Strange files in Local Settings\Temp

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  Hi all

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  Because you have qnx tag in the file. Remove and everything in it - this tag and content belongs to blackberry - tablet.xml. Validator of Adobe (which gives you an error) air does not recognize as a first class citizen, then put all of the additional tags in the additional xml file.

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  Hi Billy,

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• [MAF - AMPA] Strange behavior of the MAF with REST service

  Hi MAF Experts.

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  {

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  Hendry,

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  I have a really strange bug in an application.
  
  I have a report on the table which displays some O/N flags. The columns that display the flags are implemented as hyperlinks, so the user can reset the flags to "n" by clicking on the links.
  
  It is based on the following post:
  
  Processes necessary to remove line
  
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  Hello

  You can also use an approach using Ajax as described here: [http://apex.oracle.com/pls/otn/f?p=41715:17].

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  http://roelhartman.blogspot.com/

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  Hello
  
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  Do you have any idea why?
  
  Kind regards
  Przemek

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  Frank,

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• vCPU distribution issues

  Hello

  I am trying to understand the virtual machines on the same physical host and their CPU usage.  I have a two processors four hearts in this host.  I have allocated 3 vCPUs and 2 vCPUs to the application server to the terminal server.  (once again both on the same physical host).  I also read on the assignment only 1 vCPU per VM, but have not yet tried.  What do you think of this information below?

  Application server:

  This shows the configuration of default resources: http://picasaweb.google.com/lh/photo/EzKHXVEHU49ShpPy6wDK5S3TS606dIvr41qRtVcvCu0?feat=directlink

  It shows a picture of the performance of the virtual machine: http://picasaweb.google.com/lh/photo/i-m_0e92bunQhGpU9jV3ny3TS606dIvr41qRtVcvCu0?feat=directlink

  Why is the max cpu 600 MHZ when I allocate two 2.5 ghz vCPU?  Is that the size of the chart just specced out for certain types of average use?

  Server terminal server:

  Which shows the configuration of default resources: http://picasaweb.google.com/lh/photo/EbD1hRLKnYBiY9WtqH6U8i3TS606dIvr41qRtVcvCu0?feat=directlink

  It shows a picture of the performance of the virtual machine: http://picasaweb.google.com/lh/photo/PvHV1_PcIyqKqV9HepSf-y3TS606dIvr41qRtVcvCu0?feat=directlink

  The max cpu this is 3000 MHZ when I'm allocating three 2.5 ghz vCPU? (once again the thoughts are welcome)

  Also, if I use integrated planning in ESXi, and I simply assign 1, 2 or 3, etc., vCPUs, the Scheduler uses all hearts to its tasks?  He only appears in the paintings of performance as 0, 1, 2 on the server terminal server in three vCPU and 0 and 1 on the application server?

  Thanks for your thoughts.

  Hi vm408,

  First, it is important to know what type of processor you have. In what concerns HyperThreading, which is on the number of cores logic and physical host compare.

  On the course of VMware, we discussed after that, and VMware trainer has indicated that:

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  3. it is not recommended, but guaranteed return, you can assign physical basis to vCPU (non-physical 0-based). Many benefits of virtualization will become unavalable, but some insulation and performance will be provided.

  If your host has hyperthreading processors, assign not strange vCPUs (5, 3, etc.). There is a tip - hyperthreading last processors are actually appears in the guest as hyperthreading OS and the same behavior, i.e. vCPU 1 is phisycal and vCPU 2 would be its logical side.

  With regard to your questions:

  If I give a two VM cores and another three VM cores, are their main resources that overlap... am I sharing carrots?  -You process will be treated on any available physical core. Point of virtualization is to share cycles available CPU.

  As on my pictures, it shows that the virtual machine with two being on 0 and 1 and the virtual machine with three be 0-2.  Does this mean that they share carrots?  -Yes, but only when the kernel is available. vCPU 0 on VM1 = is not not using physical core 0 (vmkernal) when she needs and = 0 on VM2 vCPU can run on the physical base 7. He is the host jobs to find availble free kernel and to calculate its power.

  There is nothing to fear in your scenario. If you need to buy a faster CPU performance, in terms of vCPU 1 or 2 should be sufficient.

  delay to 20ms for CPU's like 1000 years for us humans. I don't think that what is happening really (IMHO).

• Freeze lock discussions internal JVM

  H3. Question
  We have a problem with a multithreaded application that runs on the JVM 1.6 (/ opt/jdk1.6.0_21): two threads appear to be locked on the internal semaphore of the JVM. We have no lock on this code (even on the superclass).
  
  Is it possible to guess a solution for this problem?
  
  H3. Data
  H5. Java thread dump
  The java Threads are (Note States inconsistent Object.wait () and RUNNABLE):

  "Thread-2577696" prio=10 tid=0x08b76c00 nid=0x8f3 in Object.wait() [0x2f439000]
     java.lang.Thread.State: RUNNABLE
       at naf.arquitectura.DatoEnArray.<clinit>(DatoEnArray.java:21)
       at atclib.copy.CPY_CRPEE032.<init>(CPY_CRPEE032.java:15)
       at com.atcanet.impresor.comun.accesoDatos.AccesoDatosEtiquetaCorreo.darDomicilioPersona(AccesoDatosEtiquetaCorreo.java:312)
       at com.atcanet.impresor.separador.procesador.EtiquetaCorreo.domicilioPersona(EtiquetaCorreo.java:280)
       at com.atcanet.impresor.separador.procesador.EtiquetaCorreo.procesar(EtiquetaCorreo.java:106)
       at com.atcanet.impresor.separador.procesador.BloqueProcesamiento.ejecutarProceso(BloqueProcesamiento.java:37)
       at com.atcanet.impresor.separador.procesa
  
  "Thread-2577700" prio=10 tid=0x0ab44c00 nid=0x8f7 in Object.wait() [0x2f47b000]
     java.lang.Thread.State: RUNNABLE
       at atclib.copy.CPY_CRSRB080.<init>(CPY_CRSRB080.java:16)
       at com.atcanet.impresor.comun.accesoDatos.AccesoDatosEtiquetaCorreo.obtenerClaveImpresion(AccesoDatosEtiquetaCorreo.java:591)
       at com.atcanet.impresor.separador.procesador.ControlComunicadosResumen.procesarComResumen(ControlComunicadosResumen.java:136)
       at com.atcanet.impresor.separador.procesador.ControladorDatos.procesar(ControladorDatos.java:299)
       at com.atcanet.impresor.separador.procesador.BloqueProcesamiento.ejecutarProceso(BloqueProcesamiento.java:37)
       at com.atcanet.impresor.separador.procesador.LanzadorProceso.run(LanzadorProceso.java:82)

  H5. Native thread dump
  A dump "jstack m" with the native threads of 2291 and 2295 shows this (note that the ObjectSynchronizer19waitUninterruptibly):
  

  ----------------- 2291 -----------------
  0xb7f7f402          ????????
  0xb7942ee5     _ZN2os13PlatformEvent4parkEv + 0xe5
  0xb79ff15b     _ZN13ObjectMonitor4waitExbP6Thread + 0x5fb
  0xb79fc513     _ZN18ObjectSynchronizer19waitUninterruptiblyE6HandlexP6Thread + 0x53
  0xb7739447     _ZN13instanceKlass15initialize_implE19instanceKlassHandleP6Thread + 0x77
  0xb7738bc8     _ZN13instanceKlass10initializeEP6Thread + 0x58
  0xb7753cd6     _ZN18InterpreterRuntime4_newEP10JavaThreadP19constantPoolOopDesci + 0xc6
  0xb4364da4     * naf.arquitectura.DatoEnArray.<clinit>() bci:0 line:21 (Interpreted frame)
  0xb435234c     <StubRoutines>
  0xb775e920     _ZN9JavaCalls11call_helperEP9JavaValueP12methodHandleP17JavaCallArgumentsP6Thread + 0x190
  0xb79423a8     _ZN2os20os_exception_wrapperEPFvP9JavaValueP12methodHandleP17JavaCallArgumentsP6ThreadES1_S3_S5_S7_ + 0x18
  0xb775e77f     _ZN9JavaCalls4callEP9JavaValue12methodHandleP17JavaCallArgumentsP6Thread + 0x2f
  0xb773a8f6     _ZN13instanceKlass27call_class_initializer_implE19instanceKlassHandleP6Thread + 0xb6
  0xb7739681     _ZN13instanceKlass15initialize_implE19instanceKlassHandleP6Thread + 0x2b1
  0xb7738bc8     _ZN13instanceKlass10initializeEP6Thread + 0x58
  0xb77398dc     _ZN13instanceKlass15initialize_implE19instanceKlassHandleP6Thread + 0x50c
  0xb7738bc8     _ZN13instanceKlass10initializeEP6Thread + 0x58
  0xb7753cd6     _ZN18InterpreterRuntime4_newEP10JavaThreadP19constantPoolOopDesci + 0xc6
  0xb4364da4     * atclib.copy.CPY_CRPEE032.<init>() bci:11 line:15 (Interpreted frame)
  0xb435508d     * com.atcanet.impresor.comun.accesoDatos.AccesoDatosEtiquetaCorreo.darDomicilioPersona(java.lang.String, java.lang.String, java.lang.String, java.lang.String) bci:71 line:312 (Interpreted frame)
  0xb4354f27     * com.atcanet.impresor.separador.procesador.EtiquetaCorreo.domicilioPersona(java.lang.String, java.lang.String, java.lang.String, java.lang.String) bci:9 line:280 (Interpreted frame)
  0xb435508d     * com.atcanet.impresor.separador.procesador.EtiquetaCorreo.procesar(java.lang.Object[]) bci:94 line:106 (Interpreted frame)
  0xb4355403     * com.atcanet.impresor.separador.procesador.BloqueProcesamiento.ejecutarProceso(int, java.lang.Object[]) bci:19 line:37 (Interpreted frame)
  0xb4354f27     * com.atcanet.impresor.separador.procesador.LanzadorProceso.run() bci:33 line:82 (Interpreted frame)
  0xb435234c     <StubRoutines>
  0xb775e920     _ZN9JavaCalls11call_helperEP9JavaValueP12methodHandleP17JavaCallArgumentsP6Thread + 0x190
  0xb79423a8     _ZN2os20os_exception_wrapperEPFvP9JavaValueP12methodHandleP17JavaCallArgumentsP6ThreadES1_S3_S5_S7_ + 0x18
  0xb775e127     _ZN9JavaCalls12call_virtualEP9JavaValue11KlassHandle12symbolHandleS3_P17JavaCallArgumentsP6Thread + 0xb7
  0xb775e1da     _ZN9JavaCalls12call_virtualEP9JavaValue6Handle11KlassHandle12symbolHandleS4_P6Thread + 0x6a
  0xb77de965     _Z12thread_entryP10JavaThreadP6Thread + 0xa5
  0xb7a3259e     _ZN10JavaThread3runEv + 0x11e
  0xb794389e     _Z10java_startP6Thread + 0x14e
  0x00b7d49b     start_thread + 0xcb
  ----------------- 2295 -----------------
  0xb7f7f402          ????????
  0xb7942ee5     _ZN2os13PlatformEvent4parkEv + 0xe5
  0xb79ff15b     _ZN13ObjectMonitor4waitExbP6Thread + 0x5fb
  0xb79fc513     _ZN18ObjectSynchronizer19waitUninterruptiblyE6HandlexP6Thread + 0x53
  0xb7739447     _ZN13instanceKlass15initialize_implE19instanceKlassHandleP6Thread + 0x77
  0xb7738bc8     _ZN13instanceKlass10initializeEP6Thread + 0x58
  0xb77398dc     _ZN13instanceKlass15initialize_implE19instanceKlassHandleP6Thread + 0x50c
  0xb7738bc8     _ZN13instanceKlass10initializeEP6Thread + 0x58
  0xb7753cd6     _ZN18InterpreterRuntime4_newEP10JavaThreadP19constantPoolOopDesci + 0xc6
  0xb4364da4     * atclib.copy.CPY_CRSRB080.<init>() bci:16 line:16 (Interpreted frame)
  0xb435508d     * com.atcanet.impresor.comun.accesoDatos.AccesoDatosEtiquetaCorreo.obtenerClaveImpresion(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, org.atca.grid.GridJobContext) bci:35 line:591 (Interpreted frame)
  0xb4354f27     * com.atcanet.impresor.separador.procesador.ControlComunicadosResumen.procesarComR

  H5. Classes
  
  As you can see above, the threads are frozen on DatoEnArray:21 and CPY_CRSRB080:16
  

  19: public abstract class DatoEnArray extends Dato                                                                                                                                              
  20: {                                                                                                                                                                                           
  21:   protected static final DatoEnArray REDEFINE_GENERICO = new Texto("REDEFINE_GENERICO");                                                                                                                                

                                                                                                                                                                                         
  10: public class CPY_CRSRB080 extends CopyRutina                                                                                                                                                
  11: {                                                                                                                                                                                           
  12:   private String nombre = "CRSRB080";                                                                                                                                                       
  13:                                                                                                                                                                                             
  14:                                                                                                                                                                                             
  15:   public TextoCompuesto NIVEL_01 = null;                                                                                                                                                    
  16:   public Texto CODPOST = new Texto(5);             

  The class loading and the call block initialize is implicitly only son. If you load the class in a thread, all other threads that are trying to use this class must wait until he has finished.

  It is possible to enter a deadoad with these implicit lock in theory, but I have never seen this happen in practice.

  for example
  If you start a thread in a static block initialize and wait that this thread is complete, but the thread has need of the class that you load, you get a deadlock.