ableegoldman commented on a change in pull request #11123:
URL: https://github.com/apache/kafka/pull/11123#discussion_r675938982
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File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
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@@ -386,23 +405,23 @@ public void setStateListener(final
KafkaStreams.StateListener listener) {
* terminates due to an uncaught exception.
*
* @param uncaughtExceptionHandler the uncaught exception handler for all
internal threads; {@code null} deletes the current handler
- * @throws IllegalStateException if this {@code KafkaStreams} instance is
not in state {@link State#CREATED CREATED}.
+ * @throws IllegalStateException if this {@code KafkaStreams} instance has
already been started.
*
* @deprecated Since 2.8.0. Use {@link
KafkaStreams#setUncaughtExceptionHandler(StreamsUncaughtExceptionHandler)}
instead.
*
*/
@Deprecated
public void setUncaughtExceptionHandler(final
Thread.UncaughtExceptionHandler uncaughtExceptionHandler) {
synchronized (stateLock) {
- if (state == State.CREATED) {
+ if (state.hasNotStarted()) {
oldHandler = true;
processStreamThread(thread ->
thread.setUncaughtExceptionHandler(uncaughtExceptionHandler));
if (globalStreamThread != null) {
globalStreamThread.setUncaughtExceptionHandler(uncaughtExceptionHandler);
}
} else {
- throw new IllegalStateException("Can only set
UncaughtExceptionHandler in CREATED state. " +
+ throw new IllegalStateException("Can only set
UncaughtExceptionHandler before calling start(). " +
Review comment:
I feel we've had a number of users be confused by this error message
before, because they don't know what it actually means for the state to be
`CREATED` -- a more useful exception would be to describe what they did
wrong/need to do right to fix this
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