java.io.IOException: Can't read [proguard.ClassPathEntry@5ef04b5] (Can't process class [WEB-INF/clas

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执行Maven Install打包的时候，出现以下错误信息：

[proguard] ProGuard, version 4.4 [proguard] Reading input... [proguard] Reading program war [F:\Workspaces\pro-test\target\pro-test-0.0.1-SNAPSHOT.war] (filtered) [proguard] java.io.IOException: Can't read [proguard.ClassPathEntry@5ef04b5] (Can't process class [WEB-INF/classes/pro/test/First.class] (Unsupported version number [52.0] for class format)) [proguard]     at proguard.InputReader.readInput(InputReader.java:230) [proguard]     at proguard.InputReader.readInput(InputReader.java:200) [proguard]     at proguard.InputReader.readInput(InputReader.java:178) [proguard]     at proguard.InputReader.execute(InputReader.java:78) [proguard]     at proguard.ProGuard.readInput(ProGuard.java:195) [proguard]     at proguard.ProGuard.execute(ProGuard.java:78) [proguard]     at proguard.ProGuard.main(ProGuard.java:499)

问题分析

产生该错误的原因是因为项目使用的Java（JDK）版本比较高，而ProGuard, version 4.4支持的版本（最高到1.6），所以产生该问题。

解决方案

以问题的解决方案与“Error: Unsupported java version ‘1.8’ in line 2 of file ‘proguard.conf’”的一致：

改用com.github.wvengen的proguard-maven-plugin
repo地址为：http://repo1.maven.org/maven2/com/github/wvengen/proguard-maven-plugin/
完整示例如下：

            <plugin>                <groupId>com.github.wvengen</groupId>                <artifactId>proguard-maven-plugin</artifactId>                <version>2.0.10</version>                <executions>                    <execution>                        <phase>package</phase>                        <goals>                            <goal>proguard</goal>                        </goals>                    </execution>                </executions>                <configuration>                    <proguardVersion>5.2</proguardVersion>                    <obfuscate>true</obfuscate>                    <proguardInclude>${basedir}/proguard.conf</proguardInclude>                     <!-- 添加依赖，这里你可以按你的需要修改 -->                    <libs>                        <lib>${java.home}/lib/rt.jar</lib>                        <lib>E:/tomcat-8.0/lib/jsp-api.jar</lib>                        <lib>E:/tomcat-8.0/lib/servlet-api.jar</lib>                    </libs>                    <addMavenDescriptor>false</addMavenDescriptor>                    <injar>${project.build.finalName}.war</injar>                    <outjar>${project.build.finalName}-pg.war</outjar>                    <outputDirectory>${project.build.directory}</outputDirectory>                </configuration>                <dependencies>                     <!-- 使用5.2版本来混淆 -->                    <dependency>                        <groupId>net.sf.proguard</groupId>                        <artifactId>proguard-base</artifactId>                          <version>5.2</version>                        <scope>runtime</scope>                    </dependency>                </dependencies>            </plugin>

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