Tess4j - Searchable PDF

Question

I am able to extract the text from images or extract the images out of a pdf and then to ocr to get the text - but I want to create a searchable pdf out of images or a pdf with images in it. It must somehow work with ITessAPI (TessAPI1 or Tesseract1) but I don't know how to start here correctly.

Edit:

public void doOcr(String tessDataPath, String imagePath) throws IOException {
    int set_only_init_params = FALSE;
    int oem = ITessAPI.TessOcrEngineMode.OEM_DEFAULT;
    PointerByReference configs = null;
    int configs_size = 0;

    String[] params = {"load_system_dawg", "tessedit_char_whitelist"};
    String vals[] = {"F", ""}; //0123456789-.IThisalotfpnex
    //PointerByReference vars_vec = new PointerByReference();
    //vars_vec.setPointer(new Pointer(params));
    //PointerByReference vars_values = new PointerByReference();
    //vars_values.setPointer(new StringArray(vals));
    NativeSize vars_vec_size = new NativeSize(params.length);

    TessAPI1 api = new TessAPI1();
    ITessAPI.TessBaseAPI handle = api.TessBaseAPICreate();

    int rc = api.TessBaseAPIInit4(handle, tessDataPath, "eng", oem, configs, configs_size, null, null, vars_vec_size, set_only_init_params);
    api.TessBaseAPISetVariable(handle, "user_defined_dpi", "270");

    if (rc != 0) {
        api.TessBaseAPIDelete(handle);
        //logger.error("Could not initialize tesseract.");
        return;
    }

    String outputbase = "C:\\Application\\ResultRenderer";
    ITessAPI.TessResultRenderer renderer = api.TessHOcrRendererCreate(outputbase);
    api.TessResultRendererInsert(renderer, api.TessBoxTextRendererCreate(outputbase));
    api.TessResultRendererInsert(renderer, api.TessTextRendererCreate(outputbase));
    String dataPath = api.TessBaseAPIGetDatapath(handle);
    api.TessResultRendererInsert(renderer, api.TessPDFRendererCreate(outputbase, dataPath, FALSE));
    int result = api.TessBaseAPIProcessPages(handle, imagePath, null, 0, renderer);

    if (result == FALSE) {
        //logger.error("Error during processing.");
        return;
    }

    while ((renderer = api.TessResultRendererNext(renderer)) != null) {
        String ext = api.TessResultRendererExtention(renderer).getString(0);
        String log = String.format("TessResultRendererExtention: %s\nTessResultRendererTitle: %s\nTessResultRendererImageNum: %d",
                ext,
                api.TessResultRendererTitle(renderer).getString(0),
                api.TessResultRendererImageNum(renderer));
    }

    api.TessDeleteResultRenderer(renderer);
    api.TessBaseAPIEnd(handle);

    File ocrPdf = new File(outputbase + ".pdf");
    if (!ocrPdf.exists()) {
        // TODO
     
    }
}