想法避免spring.handlers/spring.schemas在单个jar中合并多个spring依赖项时会被覆盖

Question

我得到了错误Unable to locate NamespaceHandler when using context:annotation-config运行(java -jar)一个由maven-assembly-plugin组装并包含我的项目及其所有依赖项的jar.

正如其他人在forum.springsource.org 线程(消息#7/8)上正确发现的那样,问题出现是因为文件META-INF/spring.handlers和META-INF/spring.schemas存在于不同的jar中,当maven-assembly-plugin在单个文件中重新打包jar时会被覆盖.

查看两个spring - *.jar文件的内容,您可以看到文件位于相对于类路径的相同位置

$ jar tf spring-oxm-3.0.3.RELEASE.jar
META-INF/spring.handlers
META-INF/spring.schemas
org/springframework/oxm/GenericMarshaller.class
...

$ jar tf spring-context-3.0.3.RELEASE.jar
META-INF/spring.handlers
META-INF/spring.schemas
org/springframework/context/ApplicationContext.class

是不是可以将META-INF文件夹放在特定的包中？如果是这样,我建议的想法(希望它是适用的)是将META-INF/spring.shemas和META-INF/spring.handlers文件放在他们引用的包下面.

$ jar tf spring-oxm-3.0.3.RELEASE.jar
org/springframework/oxm/META-INF/spring.schemas
org/springframework/oxm/META-INF/spring.handlers
org/springframework/oxm/GenericMarshaller.class
...

$ jar tf spring-context-3.0.3.RELEASE.jar
org/springframework/context/META-INF/spring.handlers
org/springframework/context/META-INF/spring.schemas
org/springframework/context/ApplicationContext.class

这样,在单个jar中合并时它们不会发生冲突.你怎么看待这件事？

Answer 1

我设法使用着色器插件而不是(buggy)汇编程序插件来摆脱错误:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>at.seresunit.lecturemanager_connector.App</mainClass>
                            </transformer>
                            <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>
                    </configuration>
                </execution>
            </executions>
        </plugin>

我想我在泉源论坛上找到了解决方案..自从我查阅以来已经有一段时间了......真的不记得作者了.无论如何,对他赞不绝口:p

干杯