阴影jar无法找到XML架构命名空间的Spring NamespaceHandler [http://www.springframework.org/schema/data/jpa]

Question

当我使用maven-shaded-plugin将所有依赖项（包括spring-data-jpa.jar）打包到一个jar中并放在WEB-INF / lib目录下时，我在Tomcat中运行的Web应用程序中遇到异常。

如果我将spring-data-jpa.jar与我的阴影jar一起直接打包到WEB-INF / lib中，问题就会消失？

NOTE: I will be running the same package as AWS Lambda hence I need to create a shaded jar.

Answer 1

为了帮助其他人，问题是多个spring - * .jar文件META-INF/spring.handlers文件在运行maven-shade-plugin时相互覆盖。

要解决在插件配置中使用<transformers>的问题。我的最终插件配置如下所示;

    <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <configuration>
        <createDependencyReducedPom>false</createDependencyReducedPom>
    </configuration>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <!-- Remove signatures from transitive dependencies and append spring handlers and schemas -->
            <configuration>
                <transformers>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/spring.handlers</resource>
                    </transformer>
                    <transformer
                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>META-INF/spring.schemas</resource>
                    </transformer>
                </transformers>
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
        </execution>
    </executions>
</plugin>

上面将把所有处理程序合并到最终jar中的一个文件中。请享用 ：-）