Fix the diagnostics where there is a JDK version mismatch

[brianquinlan]

The output looks like:

Gradle execution failed.

1. The most likely cause is that the Android build is not yet cached.

Run `flutter build apk` in example/ and try again.

2. If the Gradle output includes text like this:

* What went wrong:
Execution failed for task ':gradle:compileGroovy'.
> BUG! exception in phase 'semantic analysis' ...  Unsupported class file major version

Then the JDK versions used by jnigen and flutter are not compatible. Try
changing the default JDK version e.g. with `export JAVA_VERSION=11` on macOS and
`sudo update-alternatives --config java` on Ubuntu.

GRADLE OUTPUT:
--------------------------------------------------------------------------------

Gradle stub cannot find JAR libraries. This might be because no APK build has happened yet.
If you are seeing this error in `flutter build` output, it is likely that `jnigen` left some stubs in the build.gradle file. Please restore that file from your version control system or manually remove the stub functions named getReleaseCompileClasspath and / or getSources.

FAILURE: Build failed with an exception.

* Where:
Build file '/Users/bquinlan/dart/http/pkgs/ok_http/example/android/build.gradle' line: 29

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all files for configuration ':app:releaseCompileClasspath'.
   > Failed to transform libs.jar to match attributes {artifactType=android-classes-jar, org.gradle.libraryelements=jar, org.gradle.usage=java-runtime}.
      > Execution failed for JetifyTransform: /Users/bquinlan/dart/http/pkgs/ok_http/example/build/app/intermediates/flutter/release/libs.jar.
         > Transform's input file does not exist: /Users/bquinlan/dart/http/pkgs/ok_http/example/build/app/intermediates/flutter/release/libs.jar. (See https://issuetracker.google.com/issues/158753935)

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 3s


--------------------------------------------------------------------------------

#0      AndroidSdkTools._runGradleStub (package:jnigen/src/tools/android_sdk_tools.dart:207:7)
#1      AndroidSdkTools.getGradleClasspaths (package:jnigen/src/tools/android_sdk_tools.dart:144:7)
#2      getSummary (package:jnigen/src/summary/summary.dart:136:34)
#3      generateJniBindings (package:jnigen/src/generate_bindings.dart:30:21)
<asynchronous suspension>
#4      main (file:///Users/bquinlan/dart/native/pkgs/jnigen/bin/jnigen.dart:18:3)
<asynchronous suspension>

It would be worth cleaning up the traceback in a follow-up PR. That might be as easy as changing generate_bindings.dart:

  try {
    classes = await getSummary(config);
  } on SummaryParseException catch (e) {
    if (e.stderr != null) {
      printError(e.stderr);
    }
    log.fatal(e.message);
-  }
+  } on GradleException catch (e) {
+    log.fatal(e.message);
+  }

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

Contribution guidelines:

• See our contributor guide for general expectations for PRs.
• Larger or significant changes should be discussed in an issue before creating a PR.
• Contributions to our repos should follow the Dart style guide and use dart format.
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• Changes to packages require corresponding tests.

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[github-actions]

PR Health

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Changes to files need to be accounted for in their respective changelogs.

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pkgs/jnigen/lib/src/tools/android_sdk_tools.dart	💔 Not covered

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License Headers ✔️

// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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Files
pkgs/ffigen/example/libclang-example/generated_bindings.dart
pkgs/ffigen/example/shared_bindings/generate.dart
pkgs/ffigen/example/shared_bindings/lib/generated/a_gen.dart
pkgs/ffigen/example/shared_bindings/lib/generated/a_shared_b_gen.dart
pkgs/ffigen/example/shared_bindings/lib/generated/base_gen.dart
pkgs/ffigen/example/simple/generated_bindings.dart
pkgs/ffigen/lib/src/header_parser/clang_bindings/clang_bindings.dart
pkgs/ffigen/test/collision_tests/expected_bindings/_expected_decl_decl_collision_bindings.dart
pkgs/ffigen/test/collision_tests/expected_bindings/_expected_decl_symbol_address_collision_bindings.dart
pkgs/ffigen/test/collision_tests/expected_bindings/_expected_decl_type_name_collision_bindings.dart
pkgs/ffigen/test/collision_tests/expected_bindings/_expected_reserved_keyword_collision_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_comment_markup_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_dart_handle_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_enum_int_mimic_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_forward_decl_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_functions_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_imported_types_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_native_func_typedef_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_opaque_dependencies_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_packed_structs_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_regress_384_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_sort_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_struct_fptr_fields_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_typedef_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_unions_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_varargs_bindings.dart
pkgs/ffigen/test/large_integration_tests/_expected_cjson_bindings.dart
pkgs/ffigen/test/large_integration_tests/_expected_libclang_bindings.dart
pkgs/ffigen/test/large_integration_tests/_expected_sqlite_bindings.dart
pkgs/ffigen/test/native_test/_expected_native_test_bindings.dart
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/jni/lib/src/third_party/global_env_extensions.dart
pkgs/jni/lib/src/third_party/jni_bindings_generated.dart
pkgs/jnigen/android_test_runner/lib/main.dart
pkgs/jnigen/example/in_app_java/lib/android_utils.dart
pkgs/jnigen/example/kotlin_plugin/example/lib/main.dart
pkgs/jnigen/example/kotlin_plugin/lib/kotlin_bindings.dart
pkgs/jnigen/example/kotlin_plugin/lib/kotlin_plugin.dart
pkgs/jnigen/example/pdfbox_plugin/lib/pdfbox_plugin.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/pdmodel/PDDocument.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/pdmodel/PDDocumentInformation.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/pdmodel/_package.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/text/PDFTextStripper.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/text/_package.dart
pkgs/jnigen/lib/src/bindings/descriptor.dart
pkgs/jnigen/lib/src/elements/elements.g.dart
pkgs/jnigen/test/jackson_core_test/third_party/bindings/com/fasterxml/jackson/core/_package.dart
pkgs/jnigen/tool/command_runner.dart
pkgs/native_assets_builder/test_data/native_dynamic_linking/bin/native_dynamic_linking.dart
pkgs/objective_c/lib/src/ns_input_stream.dart
pkgs/swift2objc/lib/src/config.dart
pkgs/swift2objc/lib/src/generate_wrapper.dart
pkgs/swift2objc/lib/src/generator/_core/utils.dart
pkgs/swift2objc/lib/src/generator/generator.dart
pkgs/swift2objc/lib/src/generator/generators/class_generator.dart
pkgs/swift2objc/lib/src/parser/parsers/declaration_parsers/parse_initializer_declaration.dart
pkgs/swift2objc/lib/src/parser/parsers/declaration_parsers/parse_variable_declaration.dart
pkgs/swift2objc/lib/src/transformer/_core/unique_namer.dart
pkgs/swift2objc/lib/src/transformer/_core/utils.dart
pkgs/swift2objc/lib/src/transformer/transformers/transform_globals.dart
pkgs/swift2objc/lib/src/transformer/transformers/transform_variable.dart
pkgs/swift2objc/test/unit/parse_initializer_param_test.dart

[coveralls]

coverage: 90.779% (+0.001%) from 90.778%
when pulling 2c78bb2 on brianquinlan:version_diagnose
into 2ff68a9 on dart-lang:main.

[HosseinYousefi]

Thanks @brianquinlan!