执行Maven Install打包的时候，出现以下错误信息：
[proguard] ProGuard, version 4.4 [proguard] Reading program war [F:\Workspaces\pro-test\target\pro-test-0.0.1-SNAPSHOT.war] (filtered) [proguard] Error: The input doesn't contain any classes. Did you specify the proper '-injars' options?
由于这个是一个测试工程，还没有添加任何的类，所以虽然POM文件中指定了“injars”参数，还是产生了此错误。
“injars”参数设置参考：
<plugin> <groupId>com.pyx4megroupId> <artifactId>proguard-maven-pluginartifactId> <version>2.0.4version> <executions> <execution> <phase>packagephase> <goals> <goal>proguardgoal> goals> execution> executions> <configuration> <obfuscate>trueobfuscate> <proguardInclude>${basedir}/proguard.confproguardInclude> <libs> <lib>${java.home}/lib/rt.jarlib> <lib>lib/jsp-api.jarlib> <lib>lib/servlet-api.jarlib> libs> <addMavenDescriptor>falseaddMavenDescriptor> <injar>${project.build.finalName}.warinjar> <outjar>${project.build.finalName}-pg.waroutjar> <outputDirectory>${project.build.directory}outputDirectory> configuration> <dependencies> <dependency> <groupId>net.sf.proguardgroupId> <artifactId>proguardartifactId> <version>4.4version> <scope>runtimescope> dependency> dependencies> plugin>
