Main.java

public class Main {
  public static void main(String[] args) {
    X x = new X();

    Long value = 500L;

    if (args.length != 1) {
      System.out.println("Usage: Main <iterations>");
      System.exit(1);
    }

    int count = Integer.parseInt(args[0]);

    for (int i = 0; i < 1000000; i++) {
      x.set(value); // dynamic inference
      x.setLong(value);
    }
  }
}

RUN.md

% javac Main.java && java -XX:+PrintCompilation -XX:+UnlockDiagnosticVMOptions -XX:+PrintInlining Main 1000000 | grep X::set
     64   16       3       X::set (6 bytes)
     64   17       3       X::setLong (6 bytes)
     64   18       1       X::set (6 bytes)
     64   19       1       X::setLong (6 bytes)
     64   16       3       X::set (6 bytes)   made not entrant
     65   17       3       X::setLong (6 bytes)   made not entrant
                              @ 51   X::set (6 bytes)
                              @ 56   X::setLong (6 bytes)
                              @ 51   X::set (6 bytes)
                              @ 56   X::setLong (6 bytes)
                              @ 51   X::set (6 bytes)   inline (hot)
                              @ 56   X::setLong (6 bytes)   inline (hot)

X.java

public class X {
  private Object value;
  public <T> void set(T value) {
    this.value = value;
  }

  public void setLong(Long value) {
    this.value = value;
  }
}