mjsax commented on code in PR #18734:
URL: https://github.com/apache/kafka/pull/18734#discussion_r1938119091


##########
streams/src/main/java/org/apache/kafka/streams/kstream/SessionWindows.java:
##########
@@ -79,12 +79,12 @@ private SessionWindows(final long gapMs, final long 
graceMs) {
         this.gapMs = gapMs;
         this.graceMs = graceMs;
 
-        if (gapMs <= 0) {
-            throw new IllegalArgumentException("Gap time cannot be zero or 
negative.");
+        if (gapMs < 0) {
+            throw new IllegalArgumentException("Gap time cannot be negative.");

Review Comment:
   JavaDocs. Good catch!
   
   Did briefly look into docs. Did not found anything that we would need to 
update.



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