* fix NPE

* fix 6.x

* optimize

* add final

* fix ci

* Update apm-sniffer/apm-sdk-plugin/jdbc-commons/src/main/java/org/apache/skywalking/apm/plugin/jdbc/JDBCDriverInterceptor.java

add not null
Co-Authored-By: NXin,Zhang <zhangxin@apache.org>