Examples of java.lang.NullPointerException

java.lang.NullPointerException
Thrown when an application attempts to use null in a case where an object is required. These include:
- Calling the instance method of a null object.
- Accessing or modifying the field of a null object.
- Taking the length of null as if it were an array.
- Accessing or modifying the slots of null as if it were an array.
- Throwing null as if it were a Throwable value.
Applications should throw instances of this class to indicate other illegal uses of the null object. @author unascribed @version 1.20, 11/17/05 @since JDK1.0

    return list;
  }


  @Override
  public Screen attachWidget(Plugin plugin, Widget widget) {
    if (plugin == null) throw new NullPointerException("Plugin can not be null!");
    if (widget == null) throw new NullPointerException("Widget can not be null!");
    widgets.put(widget, plugin);
    widget.setPlugin(plugin);
    widget.setDirty(true);
    widget.setScreen(this);
    return this;

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     */
    public InputStream getResourceAsStream(String name)
    {


        if (name == null) {
            throw new NullPointerException("name");
        }


        try
        {
            InputStream is = null;

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     * @since  JDK1.1
     */
    public InputStream getResourceAsStreamFromJar(String name) {


        if (name == null) {
            throw new NullPointerException("name");
        }


        try {
            InputStream is = null;
            synchronized(syncResourceAsStreamFromJar) {

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public int attributeType (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.attributeType(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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public String nextAttributeName (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.nextAttributeName(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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public long getLongAttribute (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.getLongAttribute(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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public String getStringAttribute (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.getStringAttribute(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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public ObjectName getObjectNameAttribute (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.getObjectNameAttribute(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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public ClassName getClassNameAttribute (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.getClassNameAttribute(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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public Uid getUidAttribute (String attrName) throws NullPointerException, IOException
    {
  if (_nameService != null)
      return _nameService.getUidAttribute(_name, attrName);
  else
      throw new NullPointerException(tsLogger.log_mesg.getString("com.arjuna.ats.arjuna.gandiva.ObjectName_3"));
    }

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