Examples of org.apache.wicket.core.util.io.SerializableChecker

org.apache.wicket.core.util.io.SerializableChecker
Utility class that analyzes objects for non-serializable nodes. Construct, then call {@link #check(Object)} with the object you want to check. When a non-serializable object isfound, a {@link WicketNotSerializableException} is thrown with a message that shows the trace upto the not-serializable object. The exception is thrown for the first non-serializable instance it encounters, so multiple problems will not be shown.
As this class depends heavily on JDK's serialization internals using introspection, analyzing may not be possible, for instance when the runtime environment does not have sufficient rights to set fields accessible that would otherwise be hidden. You should call {@link SerializableChecker#isAvailable()} to see whether this class can operate properly. If itdoesn't, you should fall back to e.g. re-throwing/ printing the {@link NotSerializableException}you probably got before using this class.
@author eelcohillenius @author Al Maw

        if (CheckingObjectOutputStream.isAvailable())
        {
          try
          {
            // trigger serialization again, but this time gather some more info
            new SerializableChecker(outputStream, nsx).writeObject(obj);
          } catch (Exception x)
          {
            if (x instanceof CheckingObjectOutputStream.ObjectCheckException)
            {
              throw (CheckingObjectOutputStream.ObjectCheckException) x;

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   * @throws IOException
   */
  @Test
  public void valueMap() throws IOException
  {
    SerializableChecker checker = new SerializableChecker(new ByteArrayOutputStream(), new NotSerializableException());
    checker.writeObject(new ValueMap());
  }

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   * @throws IOException
   */
  @Test
  public void nonSerializableTypeDetection() throws IOException
  {
    SerializableChecker serializableChecker = new SerializableChecker(new ByteArrayOutputStream(),
        new NotSerializableException());
    String exceptionMessage = null;
    try
    {
      serializableChecker.writeObject(new TestType2());
    }
    catch (CheckingObjectOutputStream.ObjectCheckException e)
    {
      exceptionMessage = e.getMessage();
    }

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      {
        if (CheckingObjectOutputStream.isAvailable())
        {
          // trigger serialization again, but this time gather
          // some more info
          new SerializableChecker(outputStream, nsx).writeObject(obj);
          // if we get here, we didn't fail, while we
          // should;
          throw nsx;
        }
        throw nsx;

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      {
        if (CheckingObjectOutputStream.isAvailable())
        {
          // trigger serialization again, but this time gather
          // some more info
          new SerializableChecker(outputStream, nsx).writeObject(obj);
          // if we get here, we didn't fail, while we
          // should;
          throw nsx;
        }
        throw nsx;

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   * @throws IOException
   */
  @Test
  public void valueMap() throws IOException
  {
    SerializableChecker checker = new SerializableChecker(new ByteArrayOutputStream(), new NotSerializableException());
    checker.writeObject(new ValueMap());
  }

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  {
    Logger logger = LogManager.getLogger(CheckingObjectOutputStream.class);
    logger.setLevel(Level.WARN);
    Log4jEventHistory logHistory = new Log4jEventHistory();
    logger.addAppender(logHistory);
    SerializableChecker serializableChecker = new SerializableChecker(new ByteArrayOutputStream(),
        new NotSerializableException());
    try
    {
      serializableChecker.writeObject(new TestType1());
      String expectedMessage = "Wasn't possible to check the object 'class org.apache.wicket.util.io.SerializableCheckerTest$ProblematicType' possible due an problematic implementation of equals method";
      assertTrue(logHistory.contains(Level.WARN, expectedMessage));
    }
    catch (TestException notMeaningfulException)
    {

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   * @throws IOException
   */
  @Test
  public void nonSerializableTypeDetection() throws IOException
  {
    SerializableChecker serializableChecker = new SerializableChecker(new ByteArrayOutputStream(),
        new NotSerializableException());
    String exceptionMessage = null;
    try
    {
      serializableChecker.writeObject(new TestType2());
    }
    catch (CheckingObjectOutputStream.ObjectCheckException e)
    {
      exceptionMessage = e.getMessage();
    }

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      {
        if (SerializableChecker.isAvailable())
        {
          // trigger serialization again, but this time gather
          // some more info
          new SerializableChecker(nsx).writeObject(obj);
          // if we get here, we didn't fail, while we
          // should;
          throw nsx;
        }
        throw nsx;

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   * @throws IOException
   */
  @Test
  public void valueMap() throws IOException
  {
    SerializableChecker checker = new SerializableChecker(new NotSerializableException());
    checker.writeObject(new ValueMap());
  }

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