Error: The same input jar [C:\Program Files\Java\jdk1.8.0_281\lib\tools.jar] is specified twice.

[turnglight]

exec: mvn clean compile pacakge -DskipTests=true
error: Error: The same input jar [C:\Program Files\Java\jdk1.8.0_281\lib\tools.jar] is specified twice.
Here is my configuration:

please help me!

<configuration>
					<proguardVersion>6.0.2</proguardVersion>
					<obfuscate>true</obfuscate>
					<attachArtifactClassifier>pg</attachArtifactClassifier>
					<options>
						<option>-target 1.8</option>
						<option>-dontshrink</option>
						<option>-dontoptimize</option>
						<option>-dontskipnonpubliclibraryclasses</option>
						<option>-dontskipnonpubliclibraryclassmembers</option>
						<option>-allowaccessmodification</option>
						<option>-useuniqueclassmembernames</option>
						<option>-adaptclassstrings</option>
						<option>-dontusemixedcaseclassnames</option><option>-keeppackagenames</option>
						<option>-keepparameternames</option>
						<option>-keepattributes
							Exceptions,InnerClasses,Signature,Deprecated,SourceFile,LineNumberTable,LocalVariable*Table,*Annotation*,Synthetic,EnclosingMethod,LocalVariableTable,LocalVariableTypeTable,MethodParameters
						</option>
						<option>
							-keepclassmembers public class *{void set*(***);*** get*();}
						</option>
						<option>
							-keepclasseswithmembers public class * { public static void main(java.lang.String[]);}
						</option>
						<option>-keepclassmembers enum * { *; }</option>
						<option>-keep class com.sf.lbs.** { *; }</option>
						<option>-dontwarn **</option>
					</options>
					<libs>
						<lib>${java.home}/lib/rt.jar</lib>
						<lib>${java.home}/lib/jsse.jar</lib>
					</libs>

					<inFilter>com/sf/lbs/**</inFilter>
					<injar>classes</injar>
					<injar>${project.build.finalName}.jar</injar>
					<outjar>${project.build.finalName}-pg.jar</outjar>
					<outputDirectory>${project.build.directory}</outputDirectory>
				</configuration>
				<dependencies>
					<dependency>
						<groupId>net.sf.proguard</groupId>
						<artifactId>proguard-base</artifactId>
						<version>6.0.2</version>
						<scope>runtime</scope>
					</dependency>
				</dependencies>
			</plugin>

[mrjameshamilton]

Hi @turnglight !

It looks like you have somehow specified C:\Program Files\Java\jdk1.8.0_281\lib\tools.jar twice but I don't see from this configuration where you specify this jar. It could be a bug in the maven plugin. We don't officially support this maven plugin but I see you have already opened an issue with them - maybe they can shed some light on the problem.

You can also head over to the Guardsquare community where you can get help with your configuration from our team of engineers and skilled community members.

A related issue: you're using an old version of ProGuard. The latest version of ProGuard is 7.1.1 and a beta version supporting Java 17 and Kotlin 1.5 is 7.2.0-beta2.