我正在使用Apache FOP 1.1(Java(来生成PDF文件。它在Windows机器上工作正常,但是当我使用Ubuntu机器时,我收到此错误
org.apache.xmlgraphics.image.loader.ImageException: The file format is not supported. No ImagePreloader found
我有点困惑。请给我解决方案来解决这个问题。谢谢
问题是 jar 文件中META-INF/services/
中存在的配置文件fop
jar 文件和 jar 文件中xmlgraphics-commons
冲突。
如果您使用的是 maven 并希望避免有时可能导致麻烦的排除,您可以使用 maven shade 插件构建 jar 并在 META-INF/services/
中强制连接配置文件。像这样的片段对我有用:
<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>
我只从stackoverflow得到了解决方案。我特别感谢这篇文章的作者 Java 小程序中的 Apache FOP - 找不到数据的图像预加载器
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
gradle 的等效解决方案是:
shadowJar{
mergeServiceFiles()
}