[GR-66318] Allow opening packages that have resources but no Java classes.

PullRequest: mx/1942

Author: jirkamarsik

common.json

@@ -4,7 +4,7 @@
     "Jsonnet files should not include this file directly but use ci/common.jsonnet instead."
   ],
 
-  "mx_version": "7.58.1",
+  "mx_version": "7.58.6",
 
   "COMMENT.jdks": "When adding or removing JDKs keep in sync with JDKs in ci/common.jsonnet",
   "jdks": {

src/mx/_impl/mx_javamodules.py

@@ -673,7 +673,10 @@ def _parse_packages_spec(packages_spec, available_packages, project_scope, direc
                             mx.abort(f'The package specifier "<package-info>" cannot be used for the "opens" attribute', context=dist)
                     res.update(mx._find_packages(project_scope, onlyPublic=True))
                 else:
-                    if spec not in module_packages:
+                    if directive == 'export' and spec not in module_packages:
+                        # For the 'open' directive, we do not check whether the package spec names an
+                        # existing Java package, since it is legitimate to open a package with no
+                        # Java classes to provide access to resource files.
                         mx.abort(f'Cannot {directive} package {spec} from {moduleName} as it is not defined by any project in the module {moduleName}', context=dist)
                     if project_scope and spec not in available_packages and project_scope.suite.requiredMxVersion >= mx.VersionSpec("5.226.1"):
                         mx.abort(f'Package {spec} in "{directive}s" attribute not defined by project {project_scope}', context=project_scope)

src/mx/mx_version.py

@@ -1,2 +1,2 @@
 # The version must be updated for every PR (checked in CI) and the comment should reflect the PR's issue
-version = "7.58.6"  # GR-64688 Always apply command mapper hooks (trackers) for the image stages
+version = "7.58.7"  # GR-66318: allow opening a package without any Java classes in it