[HDFS-11233] Fix javac warnings related to the deprecated APIs after upgrading Jackson

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha2
• Fix Version/s: 3.0.0-alpha2
• Hadoop Flags: Reviewed
• Assignee: Yiqun Lin
• Reporter: Yiqun Lin
• Created: 12/Dec/16 04:08
• Updated: 13/Dec/16 18:02
• Resolved: 13/Dec/16 04:25

Description

After HADOOP-12705, the Jackson version upgraded from 2.2.3 to 2.7.8. This lead many APIs which we are used in hadoop being deprecated. Since 2.5, these two APIs are deprecated: ObjectReader#readerFor(Class<?> type),ObjectWriter#writerWithType(JavaType rootType)(http://fasterxml.github.io/jackson-databind/javadoc/2.6/com/fasterxml/jackson/databind/ObjectMapper.html).

According to the doc of ObjectMapper, we can use ObjectReader#readerFor(Class<?> type) and ObjectWriter#writerFor(JavaType) instead.

Issue Links

• is related to: MAPREDUCE-6821 Fix javac warning related to the deprecated APIs after upgrading Jackson
• relates to: HADOOP-12705 Upgrade Jackson 2.2.3 to 2.7.8