I'm getting a stackoverflow error on using $sig in a static method.

Exception in thread "main" java.lang.StackOverflowError
        at javassist.runtime.Desc.getClassType(Desc.java:139)
        at javassist.runtime.Desc.getType(Desc.java:122)
        at javassist.runtime.Desc.getClassType(Desc.java:150)
        at javassist.runtime.Desc.getType(Desc.java:122)
        at javassist.runtime.Desc.getParams(Desc.java:70)

Found the same question for version 3.15.0-GA here: https://developer.jboss.org/thread/176637 But it has no answer.

Here's the code I'm injecting:

method.insertBefore("System.out.println(com.example.MyClass.formatArgs($args, $sig));");

And this is the body of the function formatArgs:

public static String formatArgs(Object[] args, Class[] argTypes){
    try {
        StringBuilder result = new StringBuilder();
        result.append("Arguments:");
        for (int i = 0; i < args.length; ++i) {
            result.append(" - type: ").append(argTypes[i]).append(", value: ").append(args[i]);
        }
        return result.toString();
    }
    catch (Throwable e){
        System.out.println("EXCEPTION in formatArgs");
        e.printStackTrace();
    }
    return "";
}

I'm using gradle 3.0, with Javassist version 3.20.0-GA. My run command is:

java -Xbootclasspath/a:javassist-3.20.0-GA.jar -javaagent:myAgent.jar -jar myApp.jar

How do I resolve this error?