[Backport release-1.17] fix: Fix failure policy marshall error

sdk/src/main/java/io/dapr/client/domain/FailurePolicy.java

@@ -19,7 +19,7 @@
 /**
  * Set a failure policy for the job or reminder.
  */
-@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
+@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "failurePolicyType", include = JsonTypeInfo.As.EXISTING_PROPERTY)
 @JsonSubTypes({
     @JsonSubTypes.Type(value = DropFailurePolicy.class, name = "DROP"),
     @JsonSubTypes.Type(value = ConstantFailurePolicy.class, name = "CONSTANT")

sdk/src/test/java/io/dapr/serializer/FailurePolicySerializerTest.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2026 The Dapr Authors
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package io.dapr.serializer;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import io.dapr.client.domain.ConstantFailurePolicy;
+import io.dapr.client.domain.DropFailurePolicy;
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class FailurePolicySerializerTest {
+
+  @Test
+  public void constantPolicyTest()
+      throws JsonProcessingException {
+    ObjectMapper mapper = new ObjectMapper();
+    mapper.registerModule(new JavaTimeModule());
+
+    var p = new ConstantFailurePolicy();
+    p.setMaxRetries(3);
+    p.setDurationBetweenRetries(Duration.ofSeconds(0));
+    var json = mapper.writeValueAsString(p);
+
+    assertEquals(
+        "{\"maxRetries\":3,\"durationBetweenRetries\":0.0,\"failurePolicyType\":\"CONSTANT\"}",
+        json);
+  }
+
+  @Test
+  public void dropPolicyTest()
+      throws JsonProcessingException {
+    ObjectMapper mapper = new ObjectMapper();
+    mapper.registerModule(new JavaTimeModule());
+
+    var p = new DropFailurePolicy();
+    var json = mapper.writeValueAsString(p);
+
+    assertEquals(
+        "{\"failurePolicyType\":\"DROP\"}",
+        json);
+  }
+}