Fix Java exception serialization (#10568)

java/runtime/src/main/java/io/ray/runtime/exception/RayActorException.java

@@ -12,4 +12,12 @@ public class RayActorException extends RayException {
     super("The actor died unexpectedly before finishing this task.");
   }
 
+  public RayActorException(String message) {
+    super(message);
+  }
+
+  public RayActorException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
 }

java/runtime/src/main/java/io/ray/runtime/exception/RayWorkerException.java

@@ -9,4 +9,12 @@ public class RayWorkerException extends RayException {
     super("The worker died unexpectedly while executing this task.");
   }
 
+  public RayWorkerException(String message) {
+    super(message);
+  }
+
+  public RayWorkerException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
 }

java/runtime/src/main/java/io/ray/runtime/exception/UnreconstructableException.java

@@ -11,7 +11,7 @@ import io.ray.api.id.ObjectId;
  */
 public class UnreconstructableException extends RayException {
 
-  public final ObjectId objectId;
+  public ObjectId objectId;
 
   public UnreconstructableException(ObjectId objectId) {
     super(String.format(
@@ -20,4 +20,12 @@ public class UnreconstructableException extends RayException {
     this.objectId = objectId;
   }
 
+  public UnreconstructableException(String message) {
+    super(message);
+  }
+
+  public UnreconstructableException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
 }

java/test/src/main/java/io/ray/test/FailureTest.java

@@ -4,9 +4,11 @@ import io.ray.api.ActorHandle;
 import io.ray.api.ObjectRef;
 import io.ray.api.Ray;
 import io.ray.api.function.RayFunc0;
+import io.ray.api.id.ObjectId;
 import io.ray.runtime.exception.RayActorException;
 import io.ray.runtime.exception.RayTaskException;
 import io.ray.runtime.exception.RayWorkerException;
+import io.ray.runtime.exception.UnreconstructableException;
 import java.time.Duration;
 import java.time.Instant;
 import java.util.Arrays;
@@ -145,5 +147,24 @@ public class FailureTest extends BaseTest {
       }
     }
   }
+
+  public void testExceptionSerialization() {
+    RayTaskException ex1 = Assert.expectThrows(RayTaskException.class, () -> {
+      Ray.put(new RayTaskException("xxx", new RayActorException())).get();
+    });
+    Assert.assertEquals(ex1.getCause().getClass(), RayActorException.class);
+    RayTaskException ex2 = Assert.expectThrows(RayTaskException.class, () -> {
+      Ray.put(new RayTaskException("xxx", new RayWorkerException())).get();
+    });
+    Assert.assertEquals(ex2.getCause().getClass(), RayWorkerException.class);
+
+    ObjectId objectId = ObjectId.fromRandom();
+    RayTaskException ex3 = Assert.expectThrows(RayTaskException.class, () -> {
+      Ray.put(new RayTaskException("xxx", new UnreconstructableException(objectId)))
+          .get();
+    });
+    Assert.assertEquals(ex3.getCause().getClass(), UnreconstructableException.class);
+    Assert.assertEquals(((UnreconstructableException) ex3.getCause()).objectId, objectId);
+  }
 }