PDFBox error: "org.apache.pdfbox.rendering.PDFRenderer not found" when it is present

Question

我正在为 Bitbucket Server 编写一个插件，我必须在其中处理将 PDF 渲染为图像的问题。为此，我使用 PDFBox。我有一个 pdfToPng 方法将被调用来进行处理，并且我已经修改了 PDF 渲染器，类似于 Apache 示例所建议的那样。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.rendering.PageDrawer;
import org.apache.pdfbox.rendering.PageDrawerParameters;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class PDFProcessor {

    private static Logger logger = LoggerFactory.getLogger(PDFProcessor.class);

    private static int _colorMode;

    /**
     * Convert a page of a PDF document into a colored PNG
     * @param color color to use, 0 - black, 1- red
     * @param fileName output file
     * @param pdfFile PDF to process
     * @throws IOException
     */
    public static void pdfToPng(int color, String fileName, File pdfFile) throws IOException{
        _colorMode = color;
        try (PDDocument pdfDoc = PDDocument.load(pdfFile)){
            logger.info("Begin PDF to PNG render for " + fileName);
            PDFRenderer renderer = new CustomPdfRenderer(pdfDoc);
            BufferedImage image = renderer.renderImageWithDPI(0,600);
            logger.info("Making PNG transparent...");
            BufferedImage transparentImage = ImageProcessor.makeTransparent(image,new Color(image.getRGB(0,0)));
            ImageIO.write(transparentImage, "PNG",new File(fileName+".png"));
            logger.info("Image processed successfully, writing to " + fileName + ".png");
        }
    }

    private static class CustomPdfRenderer extends PDFRenderer{
        CustomPdfRenderer(PDDocument document){
            super(document);
        }

        @Override
        protected PageDrawer createPageDrawer(PageDrawerParameters params) throws IOException{
            return new CustomPageDrawer(params);
        }
    }

    private static class CustomPageDrawer extends PageDrawer{
        CustomPageDrawer(PageDrawerParameters params) throws IOException{
            super(params);
        }

        @Override
        protected Paint getPaint(PDColor color) throws IOException{
            if ((color.toRGB() == (Color.BLACK.getRGB() & 0x00FFFFFF)) && (_colorMode == 1)){
                return Color.RED;
            }
            return super.getPaint(color);
        }
    }
}

该项目是使用Maven构建的，因为这是BitBucket用于插件开发的时候。但是，当实际调用该方法时，我得到一个 ClassNotFound 异常说明：

[INFO] Caused by: java.lang.NoClassDefFoundError: org/apache/pdfbox/rendering/PDFRenderer
[INFO]  at com.my-plugin.DiffManager.prepareDiff(DiffManager.java:99)
[INFO]  at com.my-plugin.DiffManager.doGet(DiffManager.java:67)
[INFO]  at com.my-plugin.DiffManager.doPost(DiffManager.java:84)
[INFO]  ... 33 common frames omitted
[INFO] Caused by: java.lang.ClassNotFoundException: org.apache.pdfbox.rendering.PDFRenderer not found by com.my-plugin.integrationPlugin [219]
[INFO]  at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1532)
[INFO]  ... 36 common frames omitted

如您所见，我已经导入了 PDFRenderer class。我的 pom.xml 也包含正确的依赖定义：

<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.14</version>
    <scope>provided</scope>
</dependency>

为什么 Java 找不到 PDFRenderer class？以这种方式声明的其他依赖项从来没有这个问题。

Answer 1

您正在使用 pdfbox 与 <scope>provided</scope> 的依赖关系。您希望谁在需要时提供这种依赖性？像 Tomcat?

这样的应用程序容器

我建议您删除 scope 行，这样依赖将隐含在 compile 范围内，这应该可以解决您的问题。

请同时参考 Maven scope docs 上面写着：

compile – 这是默认范围，如果指定 none 则使用。编译依赖项在项目的所有类路径中都可用。
provided– 这很像编译，但表示您希望 JDK 或容器在运行时提供依赖项。

PDFBox error: "org.apache.pdfbox.rendering.PDFRenderer not found" when it is present

PDFBox error: "org.apache.pdfbox.rendering.PDFRenderer not found" when it is present

java

maven

pdfbox

bitbucket-server