ADDITIONAL SYSTEM INFORMATION :
macOS Sonoms 14.2.1
Java 21.0.2

A DESCRIPTION OF THE PROBLEM :
String.repeat() not working correctly in JShell, corresponding Java Programm produces expected results

jshell> var buffer = new StringBuffer().repeat("BLA", 3) buffer ==> BLABLABLA
jshell> new StringBuffer().repeat("BLA", 3) $32 ==> BLABLABLA
jshell> var buffer = new StringBuffer() buffer ==>
     jshell> buffer = buffer.repeat("MOIN", 2)
     buffer ==>
     jshell> System.out.println(buffer)
jshell> var sb = new StringBuffer() sb ==>
     jshell> sb.repeat('*', 10)
     $48 ==>
     jshell> sb
     sb ==>
     jshell> sb.toString()
     $50 ==> ""

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
jshell> var buffer = new StringBuffer().repeat("BLA", 3)
buffer ==> BLABLABLA

jshell> new StringBuffer().repeat("BLA", 3)
$32 ==> BLABLABLA

jshell> var buffer = new StringBuffer()
buffer ==>

jshell> buffer = buffer.repeat("MOIN", 2)
buffer ==>

jshell> System.out.println(buffer)

jshell> var sb = new StringBuffer()
sb ==>

jshell> sb.repeat('*', 10)
$48 ==>

jshell> sb
sb ==>

jshell> sb.toString()
$50 ==> ""

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
BLABLABLA
BLABLABLA
MOINMOIN
**********

---------


ACTUAL -
See above, some repeat()-call produce empty results

---------- BEGIN SOURCE ----------
public class StringBufferRepeat {
    public static void main(String[] args) {
        var buffer = new StringBuffer().repeat("BLA", 3);
        System.out.println(buffer);

        System.out.println(new StringBuffer().repeat("BLA", 3));

        buffer = new StringBuffer();
        buffer = buffer.repeat("MOIN", 2);
        System.out.println(buffer);

        var sb = new StringBuffer();
        sb.repeat('*', 10);
        System.out.println(sb);
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
NONE => jshell not working as expected

FREQUENCY : always