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Editorial Team
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Asked: 2026-05-25T15:53:31+00:00

I’m trying to make single executable *.jar via proguard plugin for sbt 10.*. All

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I’m trying to make single executable *.jar via proguard plugin for sbt 10.*.

All seems to be okay, except that sbt-proguard doesn’t include java jars (in my case mysql-connector-java-5.1.10.jar) cause when I’m trying to run output jar with

java -jar proguard-output.min.jar

I’m getting

Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
(while sbt `run` goes fine so mysql connector is definitely in project).

I’ve tried to leverage that problem by adding jar explicitly in build.sbt:

proguardInJars += Path.userHome / ".m2" / "repository" / "mysql" / "mysql-connector-java" / "5.1.10" / "mysql-connector-java-5.1.10.jar"

moreover in proguard log: 

...  
Preparing output jar  
...  
Copying resources from program jar [/home/kostya/.m2/repository/mysql/mysql-connector-java/5.1.10/mysql-connector-java-5.1.10.jar] (filtered) 
...

But I’m still getting the same exception. What am I doing wrong?

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1 Answer

  1. Editorial Team

    The class is specified in the input, but the code only instantiates it by introspection, which ProGuard can’t know. You therefore have to specify explicitly that it has to be preserved in the output.

    Cfr. ProGuard manual > Examples > Processing database drivers

    Cfr. ProGuard manual > Troubleshooting > ClassNotFoundException

    A safer solution is probably not to process third-party jars like the JDBC driver, but to specify them as library jars instead.

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