异常信息：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
java.lang.NoSuchMethodError: com.sun.mail.util.TraceInputStream.<init>(Ljava/io/InputStream;Lcom/sun/mail/util/MailLogger;)V
2020-11-05 16:33:49.859 [task-7] ERROR o.s.a.i.SimpleAsyncUncaughtExceptionHandler - Unexpected exception occurred invoking async method: public void com.xjr.kit.email.EMailUtils.sendHtmlMail(com.xjr.kit.email.EmailProperties)
java.lang.NoSuchMethodError: com.sun.mail.util.TraceInputStream.<init>(Ljava/io/InputStream;Lcom/sun/mail/util/MailLogger;)V
	at com.sun.mail.smtp.SMTPTransport.initStreams(SMTPTransport.java:2281)
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2169)
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:722)
	at javax.mail.Service.connect(Service.java:291)
	at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:518)
	at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:437)
	at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:361)
	at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:356)
	at com.xjr.kit.email.EMailUtils.sendHtmlMail(EMailUtils.java:88)
	at com.xjr.kit.email.EMailUtils$$FastClassBySpringCGLIB$$2bc1755a.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:750)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.interceptor.AsyncExecutionInterceptor.lambda$invoke$0(AsyncExecutionInterceptor.java:115)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

原因：jar包冲突
我的是javax.mail:mailapi与spring-boot-starter-mail冲突了。
找了半天javax.mail:mailapi在哪个maven依赖下，后来发现在swagger的相关依赖：springfox-staticdocs中。
在这里插入图片描述

移除javax.mail:mailapi依赖，搞定。

1
2
3
4
5
6
7
8
9
10
11
<dependency>
   <groupId>io.springfox</groupId>
   <artifactId>springfox-staticdocs</artifactId>
   <version>2.6.1</version>
		<exclusions>
			<exclusion>
				<groupId>javax.mail</groupId>
				<artifactId>mailapi</artifactId>
			</exclusion>
	</exclusions>
</dependency>