From c3f7561621aec6f0c043a1aa65be9e1d877bc575 Mon Sep 17 00:00:00 2001
From: PJ Fanning <pjfanning@users.noreply.github.com>
Date: Wed, 22 Jan 2025 19:33:27 +0100
Subject: [PATCH] test for issue #4917

---
 .../deser/jdk/JDKNumberDeserTest.java         | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/src/test/java/com/fasterxml/jackson/databind/deser/jdk/JDKNumberDeserTest.java b/src/test/java/com/fasterxml/jackson/databind/deser/jdk/JDKNumberDeserTest.java
index 5ae6b1a54e..220dc94e53 100644
--- a/src/test/java/com/fasterxml/jackson/databind/deser/jdk/JDKNumberDeserTest.java
+++ b/src/test/java/com/fasterxml/jackson/databind/deser/jdk/JDKNumberDeserTest.java
@@ -76,6 +76,24 @@ static class NestedBigDecimalHolder2784 {
         public BigDecimalHolder2784 holder;
     }
 
+    static class DeserializationIssue4917 {
+        public DecimalHolder4917 decimalHolder;
+        public Double number;
+    }
+
+    static class DecimalHolder4917 {
+        public BigDecimal value;
+
+        public DecimalHolder4917(BigDecimal value) {
+            this.value = value;
+        }
+
+        @JsonCreator
+        static DecimalHolder4917 of(BigDecimal value) {
+            return new DecimalHolder4917(value);
+        }
+    }
+
     /*
     /**********************************************************************
     /* Helper classes, serializers/deserializers/resolvers
@@ -362,4 +380,39 @@ public void testBigDecimalUnwrapped() throws Exception
         NestedBigDecimalHolder2784 result = mapper.readValue(JSON, NestedBigDecimalHolder2784.class);
         assertEquals(new BigDecimal("5.00"), result.holder.value);
     }
+
+    private final String BIG_DEC_STR;
+    {
+        StringBuilder sb = new StringBuilder("-1234.");
+        // Above 500 chars we get a problem:
+        for (int i = 520; --i >= 0; ) {
+            sb.append('0');
+        }
+        BIG_DEC_STR = sb.toString();
+    }
+    private final BigDecimal BIG_DEC = new BigDecimal(BIG_DEC_STR);
+
+    // [databind#4694]: decoded wrong by jackson-core/FDP for over 500 char numbers
+    @Test
+    public void bigDecimal4694FromString() throws Exception
+    {
+        assertEquals(BIG_DEC, MAPPER.readValue(BIG_DEC_STR, BigDecimal.class));
+    }
+
+    @Test
+    public void bigDecimal4694FromBytes() throws Exception
+    {
+        byte[] b = utf8Bytes(BIG_DEC_STR);
+        assertEquals(BIG_DEC, MAPPER.readValue(b, 0, b.length, BigDecimal.class));
+    }
+
+    @Test
+    public void bigDecimal4917() throws Exception
+    {
+        DeserializationIssue4917 issue = MAPPER.readValue(
+                a2q("{'decimalHolder':100.00,'number':50}"),
+                DeserializationIssue4917.class);
+        assertEquals(new BigDecimal("100.00"), issue.decimalHolder.value);
+    }
+
 }