RFR: 8359497: IllegalArgumentException thrown by SourceCodeAnalysisImpl.highlights()

[Vicente Romero]

On Wed, 23 Jul 2025 14:56:22 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> When JShell computes highlights, it uses the javac' lexer to detect keywords. But, if there's a lexical error in the input, the lexer will try to report an error, but that will with an exception, as there's no input file set. This PR:
> - sets a source to `Log` so that the attempt to report the error will not fail
> - sets a `DiagnosticListener` so that the error is ignored (as the error is not important, this lexer is only used to detect keyword).

lgtm

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Marked as reviewed by vromero (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26446#pullrequestreview-3117823048