AGP对象无法获取，ServiceLoader加载不到AGPInterfaceFactory

[lizhangqu]

gradle 7.4
AGP 7.1.2
JDK 11
OS mac

  implementation "com.didiglobal.booster:booster-android-gradle-api:4.4.0"

public class TestPlugin implements Plugin<Project> {
    @Override
    public void apply(Project project) {
        
        project.afterEvaluate(p -> {
            p.getExtensions().findByType(AppExtension.class).getApplicationVariants().all(
                (Action<BaseVariant>)baseVariant -> {
                    BaseVariantData variantData = AGPInterfaceKt.getAGP().getVariantData(baseVariant);
                    p.getLogger().error("variantData:" + variantData);
                });
        });
    }
}

Caused by: java.util.NoSuchElementException: List is empty.
	at kotlin.collections.CollectionsKt___CollectionsKt.first(_Collections.kt:212)
	at com.didiglobal.booster.gradle.AGPInterfaceKt$AGP$2.invoke(AGPInterface.kt:219)
	at com.didiglobal.booster.gradle.AGPInterfaceKt$AGP$2.invoke(AGPInterface.kt)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
	at com.didiglobal.booster.gradle.AGPInterfaceKt.getAGP(AGPInterface.kt)
	at com.kaola.TestPlugin.lambda$apply$0(TestPlugin.java:23)
	at 

如果在apply后先立即触发一次调用获取AGP，则正常

public class TestPlugin implements Plugin<Project> {
    @Override
    public void apply(Project project) {
        //这里先触发一次AGP调用则后续正常
        project.getLogger().error("project:" +   ProjectKt.isAapt2Enabled(project));
        project.afterEvaluate(p -> {
            p.getExtensions().findByType(AppExtension.class).getApplicationVariants().all(
                (Action<BaseVariant>)baseVariant -> {
                    BaseVariantData variantData = AGPInterfaceKt.getAGP().getVariantData(baseVariant);
                    p.getLogger().error("variantData:" + variantData);
                });
        });
    }
}

是已知问题还是使用姿势有问题？

[johnsonlee]

亲测在 buildSrc 中定义 TestPlugin 没有复现

Screen.Recording.2022-03-06.at.1.27.25.AM.mov

[lizhangqu]

@johnsonlee 复现demo见 https://github.com/lizhangqu/booster-test
测试前建议先stop守护进程./gradlew --stop

[lizhangqu]

➜ booster-test git:(master) ./gradlew :app:assembleDebug

FAILURE: Build failed with an exception.

• What went wrong:
  A problem occurred configuring project ':app'.

List is empty.

• 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

Caused by: java.util.NoSuchElementException: List is empty.
at kotlin.collections.CollectionsKt___CollectionsKt.first(_Collections.kt:212)
at com.didiglobal.booster.gradle.AGPInterfaceKt$AGP$2.invoke(AGPInterface.kt:219)
at com.didiglobal.booster.gradle.AGPInterfaceKt$AGP$2.invoke(AGPInterface.kt)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
at com.didiglobal.booster.gradle.AGPInterfaceKt.getAGP(AGPInterface.kt)
at com.booster.test.TestPlugin.lambda$apply$0(TestPlugin.java:24)
......

BUILD FAILED in 1s
3 actionable tasks: 3 up-to-date
➜ booster-test git:(master)

[johnsonlee]

这个问题其实是已知问题，由于 Gradle 当前线程的 contextClassLoader 的问题导致，在 apply(Project) 直接调 getAGP() 时，contextClassLoader 是当前工程的 buildscript 的 ClassLoader，所以能找到工程中所有的类，当在 afterEvaluate 中时，contextClassLoader 已经变了，所以就找不到当前工程中的类了，之所以 Booster 插件没有问题是因为在 Booster 插件一开始就已经初始化 AGPInterface 了，如果单独使用 AGPInterface 则需要注意线程上下文

[johnsonlee]

Fixed in v4.5.1

[lizhangqu]

棒