项目用maven打包后，依赖内部资源丢失的解决

问题
项目用maven打包后，运行时显示无法找到服务资源，而丢失的资源来自于项目所依赖的JAR包。

分析
maven打包时，将所依赖JAR包内的有用内容，按原来的包结构复制到目标包中。检查丢失的内容，物理文件存在于目标包中，判断应是配置信息丢失。
配置信息位于目标包中\META-INF\services\，内容大体是如下形式：

...
com.sun.jersey.core.impl.provider.entity.RenderedImageProvider
com.sun.jersey.core.impl.provider.entity.MimeMultipartProvider
com.sun.jersey.core.impl.provider.entity.FormProvider
com.sun.jersey.core.impl.provider.entity.FormMultivaluedMapProvider
com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$App
com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$Text
...

所丢失的内容在相应配置文件中找不到。查看所依赖的JAR包，发现多个同名配置文件出现在不同依赖包中。maven打包时进行了覆盖而不是续写，所以出现配置内容丢失问题。

解决
maven为该问题提供了Resource Transformers插件，用以指定需要续写的文件名，以防配置信息丢失。链接http://maven.apache.org/plugins/maven-shade-plugin/examples/resource-transformers.html。

pom完整配置如下，供参考：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.mren</groupId>
	<artifactId>simplejerseyserver</artifactId>
	<packaging>jar</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>jerseyserver</name>
	<properties>
		<jersey-version>1.9.1</jersey-version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-server</artifactId>
			<version>${jersey-version}</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-grizzly</artifactId>
			<version>${jersey-version}</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-json</artifactId>
			<version>${jersey-version}</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey.contribs</groupId>
			<artifactId>jersey-multipart</artifactId>
			<version>${jersey-version}</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey.jersey-test-framework</groupId>
			<artifactId>jersey-test-framework-grizzly</artifactId>
			<version>${jersey-version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-client</artifactId>
			<version>${jersey-version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>com.sun.grizzly</groupId>
			<artifactId>grizzly-servlet-webserver</artifactId>
			<version>1.9.18-i</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.16</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<inherited>true</inherited>
				<configuration>
					<source>1.6</source>
					<target>1.6</target>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-shade-plugin</artifactId>
				<version>1.4</version>
				<executions>
					<execution>
						<phase>package</phase>
						<goals>
							<goal>shade</goal>
						</goals>
						<configuration>
							<transformers>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
									<mainClass>com.mren.jerseyserver.ServerMain</mainClass>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/javax.ws.rs.ext.MessageBodyWriter</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/javax.ws.rs.ext.MessageBodyReader</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.spi.inject.InjectableProvider</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.spi.HeaderDelegateProvider</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.server.impl.model.method.dispatch.ResourceMethodDispatchProvider</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.spi.container.ContainerProvider</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.spi.container.ContainerRequestFilter</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.spi.container.WebApplicationProvider</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/com.sun.jersey.spi.StringReaderProvider</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/javax.enterprise.inject.spi.Extension</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/javax.servlet.ServletContainerInitializer</resource>
								</transformer>
								<transformer
									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
									<resource>META-INF/services/javax.ws.rs.ext.RuntimeDelegate</resource>
								</transformer>
							</transformers>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
	<repositories>
		<repository>
			<id>maven2-repository.java.net</id>
			<name>Java.net Repository for Maven</name>
			<url>http://download.java.net/maven/2/</url>
			<layout>default</layout>
		</repository>
		<repository>
			<id>maven-repository.java.net</id>
			<name>Java.net Maven 1 Repository (legacy)</name>
			<url>http://download.java.net/maven/1</url>
			<layout>legacy</layout>
		</repository>
	</repositories>
</project>