问 Spring Boot和Barbecue条形码库-文本未打印

EN

我有一个非常令人费解的场景。让我先粘贴代码，然后解释。

POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>DeleteMe</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
    <maven.compiler.source>15</maven.compiler.source>
    <maven.compiler.target>15</maven.compiler.target>
</properties>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>net.sourceforge.barbecue</groupId>
        <artifactId>barbecue</artifactId>
        <version>1.5-beta1</version>
    </dependency>
</dependencies>

码

import net.sourceforge.barbecue.*;
import net.sourceforge.barbecue.output.OutputException;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.MessageFormat;    
@SpringBootApplication
public class App {
    public static void main(String[] args) throws BarcodeException, OutputException, IOException {
        final ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
        String barcodeText = "MSTR-23829X-9";
        final var barbecue = barbecue(barcodeText);
        System.out.println("Writing image");
        writeImage(barbecue, barcodeText);
    public static void writeImage(BufferedImage bufferedImage, String barcodeText) throws IOException {
        File outputfile = new File(MessageFormat.format("{0}.png", barcodeText));
        ImageIO.write(bufferedImage, "png", outputfile);
    public static BufferedImage barbecue(String barcodeText) throws BarcodeException, OutputException {
        Barcode barcode = BarcodeFactory.createCode128(barcodeText);
        barcode.setBarHeight(100);
        barcode.setResolution(200);