[TestNG] [WARN] Ignoring duplicate listener : org.testng.IDEATestNGRemoteListenerEx

1. 使用6.10，和6.14.3版本testng，出现多条warn信息

[TestNG] [WARN] Ignoring duplicate listener : org.testng.IDEATestNGRemoteListenerEx

[TestNG] [WARN] Ignoring duplicate listener : org.testng.IDEATestNGRemoteListenerEx

[TestNG] [WARN] Ignoring duplicate listener : org.testng.IDEATestNGRemoteListenerEx

.................

<dependency>
    <groupId>org.testng</groupId>
    <artifactId>testng</artifactId>
    <version>6.10</version>
    <scope>test</scope>
</dependency>

 2. 使用RELEASE版本testng（也就是最新版本7.0.0-beta1），出现报错

java.lang.NoSuchMethodError: org.testng.IDEARemoteTestNG.addListener(Lorg/testng/ISuiteListener;)V
at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:72)
at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

<dependency>
    <groupId>org.testng</groupId>
    <artifactId>testng</artifactId>
    <version>RLEASE</version>
    <scope>test</scope>
</dependency>

 解决办法：

使用6.9.9版本testng，可以解决上述两个问题

<dependency>
    <groupId>org.testng</groupId>
    <artifactId>testng</artifactId>
    <version>6.9.9</version>
    <scope>test</scope>
</dependency>

问题原因：未知。如有知道的，欢迎大家分享问题原因，解决疑惑。