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

public String nextAttributeName (String objName, String attrName) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.nextAttributeName(objName, attrName);
  else
      throw new NullPointerException("Implementation not set");
    }

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public long getLongAttribute (String objName, String attrName) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.getLongAttribute(objName, attrName);
  else
      throw new NullPointerException("Implementation not set");
    }

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public String getStringAttribute (String objName, String attrName) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.getStringAttribute(objName, attrName);
  else
      throw new NullPointerException("Implementation not set");
    }

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public ObjectName getObjectNameAttribute (String objName, String attrName) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.getObjectNameAttribute(objName, attrName);
  else
      throw new NullPointerException("Implementation not set");
    }

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public ClassName getClassNameAttribute (String objName, String attrName) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.getClassNameAttribute(objName, attrName);
  else
      throw new NullPointerException("Implementation not set");
    }

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public Uid getUidAttribute (String objName, String attrName) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.getUidAttribute(objName, attrName);
  else
      throw new NullPointerException("Implementation not set");
    }

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public String setLongAttribute (String objName, String attrName, long value) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.setLongAttribute(objName, attrName, value);
  else
      throw new NullPointerException("Implementation not set");
    }

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public String setStringAttribute (String objName, String attrName, String value) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.setStringAttribute(objName, attrName, value);
  else
      throw new NullPointerException("Implementation not set");
    }

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public String setObjectNameAttribute (String objName, String attrName, ObjectName value) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.setObjectNameAttribute(objName, attrName, value);
  else
      throw new NullPointerException("Implementation not set");
    }

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public String setClassNameAttribute (String objName, String attrName, ClassName value) throws NullPointerException, IOException
    {
  if (_imple != null)
      return _imple.setClassNameAttribute(objName, attrName, value);
  else
      throw new NullPointerException("Implementation not set");
    }

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