sercanCyberVision opened a new pull request, #6762:
URL: https://github.com/apache/hive/pull/6762
**ROOT CAUSE**
When `USE_BEELINE_FOR_HIVE_CLI=false` the Hive CLI fails with a
`NullPointerException` in interactive mode:
```
hive> show tables;
Exception in thread "main" java.lang.NullPointerException: Cannot invoke
"org.jline.reader.LineReader.getTerminal()" because "this.reader" is null
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:379)
at
org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:860)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:791)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:705)
at
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.apache.hadoop.util.RunJar.run(RunJar.java:333)
at org.apache.hadoop.util.RunJar.main(RunJar.java:254)
```
`executeDriver()` creates a new `CliDriver` instance and uses it for
operations such as:
```
CliDriver cli = newCliDriver();
cli.setHiveVariables(oproc.getHiveVariables());
// use the specified database if specified
cli.processSelectDatabase(ss);
// Execute -i init files (always in silent mode)
cli.processInitFiles(ss);
```
However, the `LineReader` is initialized on the outer `CliDriver` instance:
```
setupLineReader();
```
**SOLUTION**
Initialize the `LineReader` on the same `CliDriver` instance.
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