在我看来，这是编译器或JVM中的一个bug，但也许有人有更好的解释。

下面的代码运行正常，但如果我取消注释直接使用“this”的第二个可运行初始化，它将无法反序列化对象（in.readObject（）引发异常）。

public class TestClass implements Serializable {
    String               msg = "HEY!";
    SerializableRunnable runnable;
    public TestClass() {
        TestClass self = this;
        runnable = () -> self.say();  // uses a local copy of 'this'
       // runnable = () -> this.say(); // uses 'this' directly
    }
    public void say() {
        System.out.println(msg);
    }
    public static void main(String[] args) throws Exception {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        try (ObjectOutputStream out = new ObjectOutputStream(buffer)) {
            out.writeObject(new TestClass());
        }
        try (ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray()))) {
            TestClass s = (TestClass) in.readObject();
            s.say();
        }
    }
}
interface SerializableRunnable extends Runnable, Serializable {
}

这是根本原因的堆栈跟踪：

java.lang.IllegalArgumentException: Invalid lambda deserialization
    at j8test.TestClass.$deserializeLambda$(TestClass.java:1)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at java.lang.invoke.SerializedLambda.readResolve(SerializedLambda.java:230)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1104)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1810)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
    at j8test.TestClass.main(TestClass.java:30)

是预期的行为吗？