A DESCRIPTION OF THE PROBLEM :
The html generated by javadoc for @param tags on variables whose names are non-ascii is incorrect. In Java8 and earlier, it was correct, and subsequently it is not.

If I have a method "int foo(int 大象);" then I would javadoc it using /** @param 大象 - The ({@code 大象} or 大象 chinese elephant) */". If I use javadoc on a file containing this, the following is generated

<dl class="notes">
<dt>Parameters:</dt>
<dd><code>\u5927\u8c61</code> - The (<code>大象</code> or 大象 chinese elephant)</dd>
</dl>

It only seems to be the @param value that is affected. The fix for 8203176 resolved other similar issues.

REGRESSION : Last worked in version 8u301

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run javadoc on the 'Source code for an executable test case'.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
When looking at the javadoc in (any) browser, the parameters are shown correctly. The html line generated line for the parameter is expected to be (something like)

<dd><code>大象</code> - The (<code>大象</code> or 大象 chinese elephant)</dd>
ACTUAL -
The generated html is incorrect, and thus displays incorrectly in the browser. The offending line is

<dd><code>\u5927\u8c61</code> - The (<code>大象</code> or 大象 chinese elephant)</dd>

---------- BEGIN SOURCE ----------
/**
 * An elephant class.
 * (That is 大象} is chinese.
 * Use {@code 大象} in chinese.
 */
public class Elephant {
    private int 大象;
    /**
     * Take a {@code 大象} or 大象 as a parameter.
     * That is a {@code 大象} or 大象.
     * @param 大象 The ({@code 大象} or 大象 chinese elephant)
     */
    public Elephant(int 大象) {
        this.大象 = 大象;
    }

    /**
     * Get the 大象.
     * @return The 大象.
     */
    public int get大象() {
        return 大象;
    }

    /**
     * Set the 大象.
     * @param 大象 The 大象.
     */
    public void set大象(int 大象) {
        this.大象 = 大象;
    }
}

---------- END SOURCE ----------

FREQUENCY : always