Bug 203044 Invoke Script does not work correctly for two similar charts [13]
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/image/JavaxImageIOWriter.java
JavaxImageIOWriter( )
	{
		
		ImageIO.setUseCache( false );
	}
	/**
	 * Updates the writer's parameters.
	 * 
	 * @param iwp
	 */
	protected void updateWriterParameters( ImageWriteParam iwp )
	{
		
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IImageMapEmitter#getMimeType()
	 */
	public abstract String getMimeType( );
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IImageMapEmitter#getImageMap()
	 */
	public String getImageMap( )
	{
		List saList = getShapeActions( );
		if ( saList == null || saList.size( ) == 0 )
		{