maple525866 opened a new pull request, #7669:
URL: https://github.com/apache/incubator-seata/pull/7669
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### Ⅰ. Describe what this PR did
**1. Problem Background**
When the database is PostgreSQL, the table contains an array type.
When using Seata AT mode, a JSON deserialization exception is thrown when
a service failure triggers a global transaction rollback.
**2. Problem Analysis**
- Seata Array Handling Mechanism:
- PostgreSQL array fields are encapsulated as
org.apache.seata.rm.datasource.sql.serial.SerialArray objects.
- This object contains baseType, baseTypeName, and elements fields.
- Jackson Serialization Configuration:
- The JacksonUndoLogParser has enableDefaultTyping enabled for type
information processing.
- However, there are no dedicated serializers and deserializers for the
SerialArray type.
- Deserialization Conflict:
- Jackson attempts to deserialize the JSON array directly into the
java.lang.Long type.
- This results in a type mismatch exception.
**3. Solution:**
- Add dedicated SerialArray serializers and deserializers to
JacksonUndoLogParser to ensure:
- Correct JSON structure: Serialize SerialArrays into a clear object
structure.
- Type information compatibility: Support Jackson's enableDefaultTyping
mechanism.
- Null value handling: Correctly handle null elements in arrays.
### Ⅱ. Does this pull request fix one issue?
<!-- If that, add "fixes #xxx" below in the next line, for example, fixes
#97. -->
fixes #7661
### Ⅲ. Why don't you add test cases (unit test/integration test)?
### Ⅳ. Describe how to verify it
testSerializeAndDeserializeSerialArray()
- Purpose: Verify serialization/deserialization of a valid array
- Data: [1L, 2L, 3L, 4L, 5L]
- Verify: All fields match exactly
testSerializeAndDeserializeSerialArrayWithNulls()
- Purpose: Verify handling of arrays containing null elements
- Data: [1L, null, 3L]
- Verify: Null values are correctly preserved
mvn clean test
### Ⅴ. Special notes for reviews
ps: I also changed the access modifier of DmdbTimestampDeserializer to
private.❤️
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