optimize：fix license issue (#8220)

* optimize：fix license issue

* optimize：fix license issue

release: release for 2.6.0

release: release for 2.5.0

optimize: cherry pick some bugfix (#7431)

release: release for 2.3.0-rc4

release: release for 2.2.0

optimize: fix javadoc version incompatibility issue (#6704)

release: release for 2.0.0

release: release for 2.0.0

release: release for 1.8.0

release: release for 1.7.1

release: release for 1.7.1