org . Apache . XML graphics . image . loader . image异常:不支持该文件格式。找不到图像预加载程序

Question

我使用Apache FOP 1.1（Java）生成PDF文件。它在windows机器上运行良好，但当我使用Ubuntu机器时，我遇到了这个错误

org.apache.xmlgraphics.image.loader.ImageException: The file format is not supported.  No ImagePreloader found

我有点困惑。请给我解决这个问题的方法。谢谢你

Answer 1

gradle的等效解决方案是：

shadowJar{
    mergeServiceFiles()
}

Answer 2

我只从斯塔科弗洛那里得到了解决方案。我特别感谢这篇文章的作者Apache FOP in a Java Applet-No ImagePreloader for data

With reference from above post , To give precedence to XmlGraphics
API , 
  1. I have excluded XML-graphics API from FOP jar
  2. added new maven dependency XmlGraphics API and placed above FOP dependancy
  3. so that POM will give priority


   <dependency>
        <groupId>xmlgraphics-commons</groupId>
        <artifactId>xmlgraphics-commons</artifactId>
        <version>1.4</version>
    </dependency>

    <dependency>
        <groupId>org.apache.xmlgraphics</groupId>
        <artifactId>fop</artifactId>
        <version>1.1</version>
        <exclusions>
            <exclusion>
                <artifactId>xmlgraphics-commons</artifactId>
                <groupId>org.apache.xmlgraphics</groupId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.apache.avalon.framework</groupId>
        <artifactId>avalon-framework-api</artifactId>
        <version>4.3.1</version>
    </dependency>

    <dependency>
        <groupId>org.apache.avalon.framework</groupId>
        <artifactId>avalon-framework-impl</artifactId>
        <version>4.3.1</version>
    </dependency>

谢谢你

Answer 3

问题是 FOP jar 文件和 xmlgraphics-commons jar 文件中存在的 META-INF/services/ 配置文件之间存在冲突。

如果您使用maven并希望避免有时可能导致麻烦的排除，您可以使用maven阴影插件构建一个jar并强制连接META-INF/Services/中的配置文件。像这样的片段对我很有用：

   <build>
        <finalName>desired_jar_name</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.1.0</version>
                <configuration>
                    <transformers>
                        <transformer
                            implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                        <transformer
                            implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                            <mainClass>my.main.class</mainClass>
                        </transformer>
                    </transformers>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>