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

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

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

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

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  String testResource = mapManager.get(mapResource); //associated server-side class for the client


  //out.println("Got Test Resource " + testResource);


  if (testResource == null) {
      throw new NullPointerException("bad resource: " + mapResource + ".  Can't map client test to server test");
  }


  //opens an http connection to the server specified by the property
  //Main.hostName at the port specified by Main.portName to the file
  //located at testResource with the query-string query

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        String testResource = mapManager.get(mapResource);
        //associated server-side class for the client


        if (testResource == null) {
            throw new NullPointerException("bad resource: " + mapResource
                                           + ".  Can't map client test to server test");
        }


        //opens an http connection to the server specified by the property
        //Main.hostName at the port specified by Main.portName to the file

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        String mapResource = this.getClass().getName();
        this.mapManager = MapManagerImpl.getMapManager();
        String testResource = mapManager.get(mapResource);


        if (testResource == null) {
            throw new NullPointerException("bad resource: " + mapResource
                                           + ".  Can't map client test to server test");
        }


        //opens an http connection to the server specified by the property
        //Main.hostName at the port specified by Main.portName to the file

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