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To make github actions run successfully, there are two issues just fixed:
javadoc generation with backward compatible option:
--no-module-directories
Due to https://bugs.openjdk.java.net/browse/JDK-8196202 JDK 11 breaks
the search box in generated javadocs because module directories are
assumed.
This JDK bug is fixed in JDK 12, but until then we need to add
'--no-module-directories' to the javadoc options.
After JDK12, this option is been removed, so we should not add it then.
windows encoding
Fix build failure in windows caused by encoding
error info: error: unmappable character for encoding Cp1252.
windows seems try to detect character encoding when scan non-ascii
characters, but an incorrect encoding is determined.
We explicitly set compile/compileTest/javadoc encoding to utf-8 to avoid
this.