RFR: JDK-8314975: JavadocTester should set source path if not specified

[Hannes Wallnöfer]

On Fri, 25 Aug 2023 08:00:57 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

> I understand why you are doing it, but I wonder if it is possible to do it in a better way. If this is integrated, tests that use JavadocTester will always specify `-sourcepath`. That won't be clean and will likely cause suprises down the road.

As comments in the related JBS issues show, javadoc will always look for the sources somewhere. Using `testSrc` as explicit default seems preferable to the implicit default class path.

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PR Comment: https://git.openjdk.org/jdk/pull/15424#issuecomment-1695572646