review comments

dialogue-serde/src/main/java/com/palantir/conjure/java/dialogue/serde/JacksonEmptyContainerLoader.java

@@ -166,11 +166,14 @@ private static Method getJsonCreatorStaticMethod(Type type) {
         return null;
     }
 
+    /**
+     * If {@code type} is a record with 0 components, return the canonical constructor.
+     */
     @Nullable
     private static Constructor<?> getEmptyRecordCanonicalConstructor(Type type) {
         if (type instanceof Class) {
             Class<?> clazz = (Class<?>) type;
-            if (clazz.isRecord()) {
+            if (clazz.isRecord() && clazz.getRecordComponents().length == 0) {
                 for (Constructor<?> ctor : clazz.getDeclaredConstructors()) {
                     if (0 == ctor.getParameterCount()) {
                         return ctor;

dialogue-target/src/main/java/com/palantir/dialogue/EndpointError.java

@@ -0,0 +1,55 @@
+/*
+ * (c) Copyright 2025 Palantir Technologies Inc. All rights reserved.
+ *
+ * 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 com.palantir.dialogue;
+
+import com.palantir.logsafe.Safe;
+
+public abstract class EndpointError<T> {
+    @Safe
+    private final String errorCode;
+
+    @Safe
+    private final String errorName;
+
+    @Safe
+    private final String errorInstanceId;
+
+    private final T params;
+
+    protected EndpointError(String errorCode, String errorName, String errorInstanceId, T params) {
+        this.errorCode = errorCode;
+        this.errorName = errorName;
+        this.errorInstanceId = errorInstanceId;
+        this.params = params;
+    }
+
+    public final String getErrorCode() {
+        return errorCode;
+    }
+
+    public final String getErrorName() {
+        return errorName;
+    }
+
+    public final String getErrorInstanceId() {
+        return errorInstanceId;
+    }
+
+    public final T getParams() {
+        return params;
+    }
+}