Axon 3.1.2 does not work with spring-boot-devtools:1.5.9.RELEASE.
With the spring-boot-devtools dependency added, run the app with:
$ ./mvnw spring-boot:runThen execute the following requests:
$ curl -X POST \
http://localhost:8080/things \
-H 'Content-Type: application/json' \
-d '{
"id": "1",
"name": "Test"
}'
1
$ curl -X PUT \
http://localhost:8080/things/1 \
-H 'Content-Type: application/json' \
-d '{
"name": "Test 2"
}'
{"timestamp":1515786529395,"status":500,"error":"Internal Server Error","exception":"org.axonframework.eventsourcing.IncompatibleAggregateException","message":"Aggregate identifier must be non-null after applying an event. Make sure the aggregate identifier is initialized at the latest when handling the creation event.","path":"/things/1"} and you'll see the error:
org.axonframework.eventsourcing.IncompatibleAggregateException","message":"Aggregate identifier must be non-null after applying an event. ...
Now to "fix" the problem, comment out the spring-boot-devtools dependency:
...
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- see https://github.com/AxonFramework/AxonFramework/issues/282 -->
<!-- comment the spring-boot-devtools dependency out for the app to work on the PUT -->
<!--<dependency>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-devtools</artifactId>-->
<!--<optional>true</optional>-->
<!--</dependency>-->
<dependency>
<groupId>org.axonframework</groupId>
<artifactId>axon-spring-boot-starter</artifactId>
<version>${axon.version}</version>
</dependency>
... and run the app and requests as before:
$ ./mvnw clean spring-boot:run
...
$ curl -X POST \
http://localhost:8080/things \
-H 'Content-Type: application/json' \
-d '{
"id": "1",
"name": "Test"
}'
1
$ curl -X PUT \
http://localhost:8080/things/1 \
-H 'Content-Type: application/json' \
-d '{
"name": "Test 2"
}'
$ no error and note that in the logs you'll see the event handler pick up the event:
2018-01-12 21:51:59.027 INFO 61931 --- [nio-8080-exec-2] com.example.ThingHandler : Thing changed: Test 2
Running this application from the packaged Jar
(with ./mvnw package && java -jar target/axon-spring-boot-devtools-isssue-1.0-SNAPSHOT.jar)
works, even despite having spring-boot-devtools on the classpath.
Therefore the error occurs only when running in "development mode".
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