8297988: NPE in JavacTypes.getOverriddenMethods from doclint

[lahodaj]

There are a few cases where javac parses Java source code, reads some name from the AST, and throws it away. This is used e.g. when validating exports directive in the module-info, if there are no classfiles and no source files used in the current compilation from the given package, javac will peek into the sources in the package, looking at their package clause[1]. The ASTs produced by such parses are thrown away/not part of the upcoming compilation.

But, even parses like this are reported to the TaskListeners, and some of the listeners may expect that the AST is eventually attributed - but it is not, as it was used only to read some name from the source code. Specifically, for DocLint, this may lead to an NPE, but it may cause other issues as well.

The proposal here is to simply avoid sending the "parse" event for parses that are not part of the actual compilation.

[1]

jdk/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java

Line 1040 in 84b927a

if (findPackageInFile.findPackageNameOf(jfo) == tree.directive.packge.fullname) {

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Issue

• JDK-8297988: NPE in JavacTypes.getOverriddenMethods from doclint

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[lahodaj]

Resubmitted as openjdk/jdk20#2 for JDK 20.