Shulou(Shulou.com)06/03 Report--

Because jdk9 is not yet mature, and I am visually incompatible with previous versions of the jar package compiled, such as

Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoa

This can also be found because of jdk9's superclass of using URLClassLoader as the ClassLoaders of the system, so both of his previous conversions will go wrong and need to rewrite the code. Or:

Java.lang.Integer (jdbc-type= "", sql-type= "") cant be mapped for this datastore. No mapping is available.

When an error is reported when using mysql as metastore, the mysqljdbc used is: mysql-connector-java-5.1.42.jar this error cannot find the cause at all, but the error is caused by an error in the mapping of java type to sql. So the guess is still that jdk9 does not support some previous versions of jar or some previous uses of jdk. Later changed the mysqljdbc version to 6.06 and still made this error. Later, there was no error when the jdk version was changed. So, don't use java9 in the production environment right now.

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