Hi, I just tried to run `.\mvnw.cmd package -DskipTest` in windows 10 and got an error like this. ``` C:\Users\IoTDB\Documents\GitHub\incubator-iotdb>.\mvnw.cmd package -DskipTests Couldn't find "C:\Users\IoTDB\Documents\GitHub\incubator-iotdb\.mvn\wrapper\maven-wrapper.jar", downloading it ... Downloading from: "https://repo1.maven.org/maven2/io/takari/maven-wrapper/0.2.1/maven-wrapper-0.2.1.jar"; Finished downloading "C:\Users\IoTDB\Documents\GitHub\incubator-iotdb\.mvn\wrapper\maven-wrapper.jar" Downloading https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.6.1/apache-maven-3.6.1-bin.zip
Exception in thread "main" javax.net.ssl.SSLException: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty ``` This bug may related to https://issues.apache.org/jira/projects/IOTDB/issues/IOTDB-254?filter=allopenissues. I tried to replace the url from `https://` to `http://` and this problem didn’t appear again. I am not sure if there is any other problem if I made this change. Best, Haonan Hou
