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本文主要研究一下如何使用proguard混淆java9代码
maven
<plugin>
<groupId>com.github.wvengen</groupId>
<artifactId>proguard-maven-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals><goal>proguard</goal></goals>
</execution>
</executions>
<configuration>
<proguardVersion>6.0.1</proguardVersion>
<injar>${project.build.finalName}.jar</injar>
<outjar>${project.build.finalName}.jar</outjar>
<inFilter>!META-INF/maven/**,!module-info.class</inFilter>
<obfuscate>true</obfuscate>
<proguardInclude>${project.basedir}/proguard.cfg</proguardInclude>
<libs>
<lib>${java.home}/jmods/java.base.jmod(!**.jar;!module-info.class)</lib>
</libs>
</configuration>
<dependencies>
<dependency>
<groupId>net.sf.proguard</groupId>
<artifactId>proguard-base</artifactId>
<version>6.0.1</version>
<scope>runtime</scope>
</dependency>
</dependencies>
</plugin>
这里使用6.0.1版本的proguard-base
proguard.cfg
-target 9
-dontshrink
-dontoptimize
-useuniqueclassmembernames
-adaptclassstrings
-dontusemixedcaseclassnames
-keepattributes Exceptions,InnerClasses,Signature,Deprecated,SourceFile,LineNumberTable,*Annotation*,EnclosingMethod
-keepclasseswithmembers public class * { public static void main(java.lang.String[]);}
这里target要指定为9版本
问题
duplicate class definitions
[proguard] Warning: class [META-INF/versions/9/org/apache/logging/log4j/util/ProcessIdUtil.class] unexpectedly contains class [org.apache.logging.log4j.util.ProcessIdUtil]
[proguard] Reading library jar [/Users/demo/.m2/repository/org/apache/logging/log4j/log4j-to-slf4j/2.10.0/log4j-to-slf4j-2.10.0.jar]
[proguard] Reading library jar [/Users/demo/.m2/repository/org/apache/logging/log4j/log4j-api/2.10.0/log4j-api-2.10.0.jar]
[proguard] Note: duplicate definition of library class [org.apache.logging.log4j.util.ProcessIdUtil]
[proguard] Note: duplicate definition of library class [org.apache.logging.log4j.util.StackLocator]
[proguard] Reading library jar [/Users/demo/.m2/repository/org/slf4j/jul-to-slf4j/1.7.25/jul-to-slf4j-1.7.25.jar]
[proguard] Reading library jar [/Users/demo/.m2/repository/javax/annotation/javax.annotation-api/1.3.2/javax.annotation-api-1.3.2.jar]
[proguard] Warning: class [META-INF/versions/9/org/apache/logging/log4j/util/StackLocator.class] unexpectedly contains class [org.apache.logging.log4j.util.StackLocator]
[proguard] Note: there were 2 duplicate class definitions.
[proguard] (http://proguard.sourceforge.net/manual/troubleshooting.html#duplicateclass)
[proguard] Warning: there were 2 classes in incorrectly named files.
[proguard] You should make sure all file names correspond to their class names.
[proguard] The directory hierarchies must correspond to the package hierarchies.
[proguard] (http://proguard.sourceforge.net/manual/troubleshooting.html#unexpectedclass)
[proguard] If you don't mind the mentioned classes not being written out,
[proguard] you could try your luck using the '-ignorewarnings' option.
[proguard] Error: Please correct the above warnings first.
如果没有使用到log4j的话，可以在progurard.cfg文件中配置dontwarn忽略
can't find referenced class
[proguard] Warning: cn.example.Demo: can't find referenced class java.io.ByteArrayOutputStream
[proguard] Warning: there were 858 unresolved references to classes or interfaces.
[proguard] You may need to add missing library jars or update their versions.
[proguard] If your code works fine without the missing classes, you can suppress
[proguard] the warnings with '-dontwarn' options.
[proguard] (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
[proguard] Warning: there were 1 unresolved references to library class members.
[proguard] You probably need to update the library versions.
[proguard] (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedlibraryclassmember)
[proguard] Error: Please correct the above warnings first.
这种多半是没有配置好libraryjars的问题，比如这里就是没有配置java.base.jmod的问题。如果还依赖有其他jmod，可以根据具体日志修改配置。
Can't read java.base.jmod
[proguard] Reading library directory [/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/jmods/java.base.jmod(!**.jar;!module-info.class)]
[proguard] Error: Can't read [/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/jmods/java.base.jmod(!**.jar;!module-info.class)] (No such file or directory: /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/jmods/java.base.jmod(!**.jar;!module-info.class))
这个是在maven的pom文件配置lib引起的
<libs>
<lib>${java.home}/jmods/java.base.jmod(!**.jar;!module-info.class)</lib>
</libs>
可能是该plugin的问题，将其配置移到proguard.cfg就可以
-libraryjars <java.home>/jmods/java.base.jmod(!.jar;!module-info.class)
小结
这里的例子仅仅还是jdk是模块化的，但是工程代码还没有模块化。等所有依赖都模块化了，可以重新试验一下。
