From 04688d08b111232c32f56ab5d598cbd61d80c2ef Mon Sep 17 00:00:00 2001
From: yanxutao89 <910135896@qq.com>
Date: Sun, 14 Apr 2024 23:14:18 +0800
Subject: [PATCH] fix hash collision for codegen

---
 .../processor/issues/Issue2411Bean.java       | 46 +++++++++++++++++++
 .../JSONCompiledAnnotationProcessor.java      |  2 +-
 .../JSONCompiledAnnotationProcessor2.java     |  7 ++-
 3 files changed, 52 insertions(+), 3 deletions(-)
 create mode 100644 codegen-test/src/test/java/com/alibaba/fastjson2/internal/processor/issues/Issue2411Bean.java

diff --git a/codegen-test/src/test/java/com/alibaba/fastjson2/internal/processor/issues/Issue2411Bean.java b/codegen-test/src/test/java/com/alibaba/fastjson2/internal/processor/issues/Issue2411Bean.java
new file mode 100644
index 0000000000..e80f7322ce
--- /dev/null
+++ b/codegen-test/src/test/java/com/alibaba/fastjson2/internal/processor/issues/Issue2411Bean.java
@@ -0,0 +1,46 @@
+package com.alibaba.fastjson2.internal.processor.issues;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.JSONReader;
+import com.alibaba.fastjson2.JSONWriter;
+import com.alibaba.fastjson2.annotation.JSONCompiled;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2411Bean {
+    static JSONWriter.Feature[] writerFeatures = {
+            JSONWriter.Feature.FieldBased,
+            JSONWriter.Feature.WriteNameAsSymbol
+    };
+    static JSONReader.Feature[] readerFeatures = {
+            JSONReader.Feature.UseDefaultConstructorAsPossible,
+            JSONReader.Feature.ErrorOnNoneSerializable, JSONReader.Feature.IgnoreAutoTypeNotMatch,
+            JSONReader.Feature.UseNativeObject, JSONReader.Feature.FieldBased
+    };
+
+    @Test
+    public void test() {
+        Bean course = new Bean();
+        course.courseId = "6bad799a1c894893bedade17215244a1";
+        course.userId = "4b99d48f87f84868a59aa3b3ce82fd56";
+
+        String json = JSON.toJSONString(course, writerFeatures);
+
+        Bean result = JSON.parseObject(json, Bean.class, readerFeatures);
+
+        assertEquals(course.userId, result.userId);
+        assertEquals(course.courseId, result.courseId);
+    }
+
+    @JSONCompiled
+    public static class Bean {
+        public String courseId;
+        public String userId;
+        public String studyRate;
+        public String resourceId;
+        public String providerCorpCode;
+        public String userAgent;
+        public String sourceId;
+    }
+}
diff --git a/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor.java b/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor.java
index 0bc9b84a72..b1972d9161 100644
--- a/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor.java
+++ b/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor.java
@@ -823,8 +823,8 @@ private static void genRead243(
                 Block.IfStmt nextIfMatchStmt = label.ifStmt(nextIfMatch);
                 genReadFieldValue(nextIfMatchStmt, fieldReaderIndex, info, fieldReader, jsonReader, object, forLabel, false);
                 nextIfMatchStmt.continueStmt(forLabel);
-                label.breakStmt();
             }
+            label.breakStmt();
         }
     }
 
diff --git a/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor2.java b/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor2.java
index 4839487c97..101089d75a 100644
--- a/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor2.java
+++ b/codegen/src/main/java/com/alibaba/fastjson2/internal/processor/JSONCompiledAnnotationProcessor2.java
@@ -292,7 +292,7 @@ private JCTree.JCMethodDecl genReadObject(JCTree.JCIdent objectType, JCTree.JCEx
 
             JCTree.JCLabeledStatement switchLabel = label("_switch", null);
             ListBuffer<JCTree.JCCase> cases = new ListBuffer<>();
-            for (int i = 0; i < fieldsSize; ++i) {
+            for (int i = 0; i < hashCode32Keys.length; ++i) {
                 java.util.List<Long> hashCode64Array = map.get(hashCode32Keys[i]);
                 List<JCTree.JCStatement> stmts = List.nil();
                 Long fieldNameHash = null;
@@ -457,6 +457,7 @@ private List<JCTree.JCStatement> genRead243(
         for (int i = 0; i < labels.length; i++) {
             int name0 = switchKeys[i];
             java.util.List<AttributeInfo> fieldReaders = name0Map.get(name0);
+            ListBuffer<JCTree.JCStatement> caseStmts = new ListBuffer<>();
             for (int j = 0; j < fieldReaders.size(); j++) {
                 AttributeInfo fieldReader = fieldReaders.get(j);
                 int fieldReaderIndex = readerIndexMap.get(fieldReader);
@@ -834,8 +835,10 @@ private List<JCTree.JCStatement> genRead243(
                         throw new IllegalStateException("fieldNameLength " + fieldNameLength);
                 }
                 List<JCTree.JCStatement> readFieldValueStmts = genReadFieldValue(fieldReader, jsonReaderIdent, fieldReaderIndex, structInfo, loopLabel, objectIdent, isJsonb);
-                cases.append(defCase(literal(name0), List.of(defIf(nextIfMethod, block(readFieldValueStmts), null), defBreak(switchLabel))));
+                caseStmts.append(defIf(nextIfMethod, block(readFieldValueStmts), null));
             }
+            caseStmts.append(defBreak(switchLabel));
+            cases.append(defCase(literal(name0), caseStmts.toList()));
         }
         switchLabel.body = defSwitch(method(field(jsonReaderIdent, "getRawInt")), cases.toList());
         stmts = stmts.append(switchLabel);