Bug 178164 Use IEngineTask.status constants and remove unnecessary status variables in EngineTask.
1)Remove following redundant variables in EngineTask used for status info. protected final int RUNNING_STATUS_START = 0; protected final int RUNNING_STATUS_RUNNING = 1; protected final int RUNNING_STATUS_STOP = 2; EngineTask already has access to constants declared in IEngineTask. Use those instead. 2)Remove the unused errorHandlingOption in EngineTask.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
return true;
			log
					.log(
							Level.SEVERE,
							"The supplied value {0} for parameter {1} is not a valid date.", new String[]{paramValue.toString( ), paramName} ); 
			return false;
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_STRING.equals( type ) )
		{
			String value = paramValue.toString( ).trim( );
			if ( value.equals( "" ) && !paramHandle.allowBlank( ) ) 
			{
				log.log( Level.SEVERE,
						"parameter {0} can't be blank.", paramName ); 
				return false;
			}
			return true;
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_BOOLEAN.equals( type ) )
		{
			if ( paramValue instanceof Boolean )
				return true;
			log
					.log(
							Level.SEVERE,
							"The supplied value {0} for parameter {1} is not a boolean.", new String[]{paramValue.toString( ), paramName} ); 
			return false;
		}
		return true;
	}