public class MarvinImageSelectionPanel extends MarvinImagePanel {
    MarvinImagePlugin rotatorPlugin;

    /*more code*/

    private MarvinImage rotateImageLeft(MarvinImage mImage) {
            MarvinImage newImage = mImage.clone();
            this.rotatorPlugin = MarvinPluginLoader.loadImagePlugin("org.marvinproject.image.transform.rotate.jar");
            this.rotatorPlugin.show();
            this.rotatorPlugin.process(mImage, newImage, null, MarvinImageMask.NULL_MASK, false);
            return newImage;
    }
}