Shixiong Zhu created SPARK-12489:
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Summary: Fix minor issues found by Findbugs
Key: SPARK-12489
URL: https://issues.apache.org/jira/browse/SPARK-12489
Project: Spark
Issue Type: Bug
Components: MLlib, Spark Core, SQL
Reporter: Shixiong Zhu
Priority: Minor
Just used FindBugs to scan the codes and fixed some real issues:
1. Close `java.sql.Statement`
2. Fix incorrect `asInstanceOf`.
3. Remove unnecessary `synchronized` and `ReentrantLock`.
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