相同的Java SerializedLambda为implMethodKind返回不同的结果

我是罗纳德，JobRunr的作者.JobRunr是一个后台作业(job)调度库，它使用SerializedLambda和ASM来分析Java 8 lambda并将其转换为后台作业(job).

最近，报告了一个错误，我try 在JobRunr中重现它，以便编写一个测试来防止回归.

有趣的是，在相同的Java版本(17.0.2)上，即使我复制了完全相同的代码，我也无法重现它.

在this project中，generated SerializedLambda的implMethodKind等于5(REF_invokeVirtual).

然而，在JobRunr本身中，generated SerializedLambda的implMethodKind等于7(REF_invokeSpecial).

生成SerializedLambda的实际代码如下:

public class GeoService {
    Logger LOG = LoggerFactory.getLogger(GeoService.class);

    public void executeGeoTreeJob(JobContext jobContext, long geoNameId, UserId userId) {
        LOG.error("Running: " + geoNameId);
    }

    public void run() {
        LOG.error("Starting job");
        UserId userId = new UserId();
        userId.setValue("test");
        long geoNameId = 1234;

        JobLambda jobLambda = () -> executeGeoTreeJob(JobContext.Null, geoNameId, userId);

        SerializedLambda serializedLambda = SerializedLambdaConverter.toSerializedLambda(jobLambda);
        System.out.println("=======");
        System.out.println("serializedLambda " + serializedLambda.getImplMethodKind());
        System.out.println("=======");

        BackgroundJob.enqueue(() -> executeGeoTreeJob(JobContext.Null, geoNameId, userId));
    }
}

在this project中，generated SerializedLambda的implMethodKind等于5(REF_invokeVirtual).

然而，在JobRunr本身中，generated SerializedLambda的implMethodKind等于7(REF_invokeSpecial).

为什么implMethodKind的值不同？或者，换句话说，我需要对setup / JVM /.与示例项目中的结果相同.

Update:个

我创建SerializedLambda如下:

public class SerializedLambdaConverter {

    private SerializedLambdaConverter() {

    }

    public static <T> SerializedLambda toSerializedLambda(T value) {
        if (!value.getClass().isSynthetic()) {
            throw new IllegalArgumentException("Please provide a lambda expression (e.g. BackgroundJob.enqueue(() -> myService.doWork()) instead of an actual implementation.");
        }

        if (!(value instanceof Serializable)) {
            throw new JobRunrException("The lambda you provided is not Serializable. Please make sure your functional interface is Serializable or use the JobLambda interface instead.");
        }

        try {
            Method writeReplaceMethod = value.getClass().getDeclaredMethod("writeReplace");
            makeAccessible(writeReplaceMethod);
            return (SerializedLambda) writeReplaceMethod.invoke(value);
        } catch (Exception shouldNotHappen) {
            throw shouldNotHappenException(shouldNotHappen);
        }
    }
}

低于javap的输出:

Compiled from "GeoService.java"
public class org.jobrunr.tests.e2e.services.GeoService {
  org.slf4j.Logger LOG;
  public org.jobrunr.tests.e2e.services.GeoService();
  public void executeGeoTreeJob(org.jobrunr.jobs.context.JobContext, long, org.jobrunr.tests.e2e.services.UserId);
  public void run();
}

附上在javap -verbose的输出中找到的标头(完整的输出对于so中的这里来说有点太多了):

Classfile /Users/rdehuyss/Projects/Personal/jobrunr/jobrunr/tests/e2e-vm-jdk/build/classes/java/main/org/jobrunr/tests/e2e/services/GeoService.class
  Last modified 20 Feb 2024; size 4064 bytes
  SHA-256 checksum 595969292bcac503d33a4e54c1b2a4ffa7517f8aa6c50a8a1470400981e08ecb
  Compiled from "GeoService.java"
public class org.jobrunr.tests.e2e.services.GeoService
  minor version: 0
  major version: 52