[spring boot] XNIO worker was not set on WebSocketDeploymentInfo, the default worker will be used 해결하기

spring boot 1.3.0에서 undertow 서블릿 컨테이너를 실행하면 아래와 같이 websocket관련 warn로그가 발생한다.

[2015-09-30 16:27:23.266] boot - 33938  WARN [restartedMain] --- jsr: UT026009: XNIO worker was not set on WebSocketDeploymentInfo, the default worker will be used

[2015-09-30 16:27:23.369] boot - 33938  WARN [restartedMain] --- jsr: UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used

해당 로그를 발생하게 하는 클래스가 JsrWebSocketLogger임을 확인한다.

http://grepcode.com/file/repo1.maven.org/maven2/io.undertow/undertow-websockets-jsr/1.2.7.Final/io/undertow/websockets/jsr/JsrWebSocketLogger.java#JsrWebSocketLogger

@LogMessage(level = Logger.Level.WARN)
@Message(id = 26009, value = "XNIO worker was not set on WebSocketDeploymentInfo, the default worker will be used")

void xnioWorkerWasNull();

spring-boot의 undertow starter에 websocket jsr 라이브러리를 dependency하고 있다.

<dependency>
   <groupId>io.undertow</groupId>
   <artifactId>undertow-websockets-jsr</artifactId>
</dependency>

websocket jsr을 dependency lib 에서 exclude하니. 더 이상 warn로그는 발생하지 않았다.

compile("org.springframework.boot:spring-boot-starter-undertow") {
    exclude group: 'io.undertow', module: 'undertow-websockets-jsr'
}