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maven assembly plugin - Idea to avoid that spring.handlers/spring.schemas get overwritten when merging multiple spring dependencies in a single jar
为了避免 jar handler/spring在合并多个 spring 依赖项时被覆盖,在单个Maven 程序集插件的思想中,可以避免这种情况

119 4

I got the error Unable to locate NamespaceHandler when using context:annotation-config running (java -jar) a jar assembled by the maven-assembly-plugin and containing my project and all its dependencies.

As other people correctly spotted on the forum.springsource.org thread (message #7/8) the problem occurs because the files META-INF/spring.handlers and META-INF/spring.schemas that are present in different jars, get overwritten when the maven-assembly-plugin repackages the jars in a single file.

Looking at the content of two spring-*.jar files you can see the files sits in the same position relatively to the classpath


$ 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




Isn't it is possible to put the META-INF folder in a specific package? if so the idea i'd suggest, (hope it's applicable) is to put the META-INF/spring.shemas and META-INF/spring.handlers files under the package they refer to.


$ 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




This way they won't conflict when merged in a single jar. what do you think about it?

时间: 原作者:

148 3

I managed to get rid of the bug using the shader plugin instead of the (buggy) assembler plugin :


 <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>




I think i found the solution on the springsource forums.. it has been quite some time since i looked it up.. can't really remember the author. Kudos to him anyways :p

cheers

原作者:
67 5

With Ant.


<!--define couple of properties to identify spring jar files-->


<property name="spring-beans-jar" value="spring-beans-4.0.5.RELEASE.jar"/>


<property name="spring-context-jar" value="spring-context-4.0.5.RELEASE.jar"/>



<!--other properties-->



<target name="dist" depends="compile" description="Prepare distribution">


 <!--dump spring-context into build classes (or some place else)-->


 <unjar src="${lib.dir}/${spring-context-jar}" dest="${build.classes.dir}"/>



 <!--dump spring-beans on top of it overwriting META-INF/spring.* files-->


 <unjar src="${lib.dir}/${spring-beans-jar}" dest="${build.classes.dir}"/>



 <!--get overwritten META-INF/spring.* files of spring-context to some other place-->


 <unjar src="${lib.dir}/${spring-context-jar}" dest="${build.tmp.dir}">


 <patternset>


 <include name="META-INF/spring.handlers"/>


 <include name="META-INF/spring.schemas"/>


 <include name="META-INF/spring.tooling"/>


 </patternset>


 </unjar>



 <!--skipped spring-beans/META-INF/spring.factories as its not present in spring-context-->


 <!--handled only spring-context and spring-beans as that's what I needed at this point-->



 <!--append content from spring-context/META-INF/spring.* files-->


 <concat destfile="${build.classes.dir}/META-INF/spring.handlers" append="true">


 <filelist dir="${build.tmp.dir}" files="META-INF/spring.handlers"/>


 </concat>


 <concat destfile="${build.classes.dir}/META-INF/spring.schemas" append="true">


 <filelist dir="${build.tmp.dir}" files="META-INF/spring.schemas"/>


 </concat>


 <concat destfile="${build.classes.dir}/META-INF/spring.tooling" append="true">


 <filelist dir="${build.tmp.dir}" files="META-INF/spring.tooling"/>


 </concat>



 <jar destfile="${build.dist.dir}/application.jar">


 <fileset dir="${build.classes.dir}"/>



 <!--include all. jar files except already extracted ones-->


 <zipgroupfileset dir="${lib.dir}" includes="*.jar"


 excludes="${spring-beans-jar}, ${spring-context-jar}"/>


 <manifest>


 <attribute name="Main-Class" value="${main-class}"/>


 </manifest>


 </jar>


</target>




原作者:
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