[jira] [Created] (FLINK-4560) enforcer java version as 1.7

[Shang Yuanchun (Jira)]

shijinkui created FLINK-4560:
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             Summary: enforcer java version as 1.7
                 Key: FLINK-4560
                 URL: https://issues.apache.org/jira/browse/FLINK-4560
             Project: Flink
          Issue Type: Improvement
            Reporter: shijinkui


1. maven-enforcer-plugin add java version enforce
2. maven-enforcer-plugin version upgrade to 1.4.1

explicit require java version



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