Later Current Result
https://github.com/zkoss/zk/blob/v9.0.0/zweb/src/org/zkoss/web/fn/ThemeFns.java#L203-L205
in zweb we use commons-codec just for Base64.
Expected Result
https://docs.oracle.com/javase/8/docs/api/java/util/Base64.html
Use built-in java.util.Base64 instead.
And remove the commons-codec dependency.
