davsclaus commented on code in PR #26304:
URL: https://github.com/apache/camel/pull/26304#discussion_r3989793531


##########
components/camel-groovy/src/main/java/org/apache/camel/groovy/json/PrettyJsonGenerator.java:
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@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.camel.groovy.json;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import groovy.json.DefaultJsonGenerator;
+import groovy.json.JsonGenerator;
+import org.apache.groovy.json.internal.CharBuf;

Review Comment:
   `org.apache.groovy.json.internal` is, as the package name says, internal — 
it carries no compatibility promise across Groovy releases, and it appears here 
in the *signatures* of the overridden methods, so there is no way to insulate 
from it while subclassing `DefaultJsonGenerator`.
   
   I think the trade is defensible: `DefaultJsonGenerator` is public and its 
`writeMap`/`writeIterator`/`writeArray` are `protected` extension points, the 
alternative is a full reimplementation of Groovy's JSON output, and the golden 
test in this PR turns any drift into a hard build failure rather than silent 
wrong output.
   
   What I would like is for that to be written down — a sentence in the PR 
description (and ideally in the class javadoc) saying the class deliberately 
extends `DefaultJsonGenerator` and therefore binds to 
`org.apache.groovy.json.internal.CharBuf`, and that `GroovyJsonPrettyPrintTest` 
is the guard for a Groovy upgrade. camel-groovy tracks Groovy fairly closely, 
so whoever does the next bump should find out from the code why their build 
broke.



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