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Comments (2)

garyrussell avatar garyrussell commented on June 16, 2024 3

There are several options.

1 Delete this line:

handler.setMessageKeyExpression(new LiteralExpression(this.messageKey));

And change the send to ...

toKafka.send(new GenericMessage<>("foo" + i));

to

toKafka.send(MessageBuilder.withPayload("foo" + i)
    .setHeader(KafkaHeades.MESSAGE_KEY)
    .build());

If there is no key expression, we look for that header (same thing for the topic, partition).

2 Change this

handler.setMessageKeyExpression(new LiteralExpression(this.messageKey));

to

handler.setMessageKeyExpression(new SpelExpressionParser.parseExpression("<some expression>"));

Where <some expression> calculates the key - such as payload.key or headers['myHeader'].

from spring-integration-samples.

garyrussell avatar garyrussell commented on June 16, 2024

See the README.

from spring-integration-samples.

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