坑爹的maven插件-assembly

今天项目需要使用maven的assembly插件打包成一个可执行的jar包，main方法类如下：

public class AppClientServiceStart {public static void main(String[] args) {ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring/spring-context.xml");com.alibaba.dubbo.container.Main.main(args);}}

其实就是启动dubbo服务，由于里面有依赖spring，使用assembly插件代码如下：

<plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-assembly-plugin</artifactId><configuration><appendAssemblyId>false</appendAssemblyId><descriptorRefs><descriptorRef>jar-with-dependencies</descriptorRef></descriptorRefs><archive><manifest><mainClass>com.XXX.AppClientServiceStart</mainClass><addClasspath>true</addClasspath></manifest></archive></configuration><executions><execution><id>make-assembly</id><phase>package</phase><goals><goal>assembly</goal></goals></execution></executions></plugin>

在执行其打包出的jar时，一直报错，错误信息如下：

Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath:spring/spring-datasource.xml]Offending resource: URL [jar:file:/Users/macbook/workspace/mishi-cmc/cmc-service/appclient/biz/target/mishi-cmc-appclient-biz.jar!/spring/spring-context.xml]; nested exception is org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/context]Offending resource: class path resource [spring/spring-datasource.xml]

开始一直以为是spring的问题，在网上查阅了很多资料，有些说是没有把classpath添加进去。但是测试结果依然是没效果。最后找到这两篇文章

http://blog.csdn.net/bluishglc/article/details/6085209 http://ju.outofmemory.cn/entry/48544。原来是assembly在打包时只会把第一次遇到的文件打入jar包，后面遇到的都会skip掉。按照这种方法试验了一下：

<plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-shade-plugin</artifactId><executions><execution><phase>package</phase><goals><goal>shade</goal></goals><configuration><finalName>cmc</finalName><shadedArtifactAttached>true</shadedArtifactAttached><shadedClassifierName>jar-with-dependencies</shadedClassifierName><transformers><transformerimplementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"><mainClass>com.mishi.cmc.appclient.AppClientServiceStart</mainClass></transformer><transformerimplementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.handlers</resource></transformer><transformerimplementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.schemas</resource></transformer><transformerimplementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.tooling</resource></transformer></transformers></configuration></execution></executions></plugin>

上面的这个错误确实是没有了，但是新的问题出现了，在运行jar时出现下面的错误：

macbookdeMacBook-Air:target macbook$ java -jar cmc.jarException in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributesat sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:286)at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:239)at java.util.jar.JarVerifier.processEntry(JarVerifier.java:317)at java.util.jar.JarVerifier.update(JarVerifier.java:228)at java.util.jar.JarFile.initializeVerifier(JarFile.java:348)at java.util.jar.JarFile.getInputStream(JarFile.java:415)at sun.misc.URLClassPath$JarLoader$2.getInputStream(URLClassPath.java:775)at sun.misc.Resource.cachedInputStream(Resource.java:77)at sun.misc.Resource.getByteBuffer(Resource.java:160)at java.net.URLClassLoader.defineClass(URLClassLoader.java:436)at java.net.URLClassLoader.access$100(URLClassLoader.java:71)at java.net.URLClassLoader$1.run(URLClassLoader.java:361)at java.net.URLClassLoader$1.run(URLClassLoader.java:355)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(URLClassLoader.java:354)at java.lang.ClassLoader.loadClass(ClassLoader.java:425)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)at java.lang.ClassLoader.loadClass(ClassLoader.java:358)at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

继续Google后发现，原来还少一段代码，最终代码如下：

<plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-shade-plugin</artifactId><executions><execution><phase>package</phase><goals><goal>shade</goal></goals><configuration><finalName>cmc</finalName><shadedArtifactAttached>true</shadedArtifactAttached><shadedClassifierName>jar-with-dependencies</shadedClassifierName><transformers><transformerimplementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"><mainClass>com.mishi.cmc.appclient.AppClientServiceStart</mainClass></transformer><transformerimplementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.handlers</resource></transformer><transformerimplementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.schemas</resource></transformer><transformerimplementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.tooling</resource></transformer></transformers><span style="color:#ff0000;"><filters><filter><artifact>*:*</artifact><excludes><exclude>META-INF/*.SF</exclude><exclude>META-INF/*.DSA</exclude><exclude>META-INF/*.RSA</exclude></excludes></filter></filters></span></configuration></execution></executions></plugin>

OK，问题算是真正解决了，先留备如此