[
https://issues.apache.org/jira/browse/HIVE-26488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17603501#comment-17603501
]
Stamatis Zampetakis commented on HIVE-26488:
--------------------------------------------
I think it is worth noting that the {{NullPointerException}} is raised when the
{{analyzerClasses}} variable contains the
{{org.apache.hadoop.hive.ql.parse.SemanticAnalyzer}} class since the latter is
missing the {{DDLType}} annotation. The code was written assuming that every
class that makes it into the loop (and it is not abstract) will be annotated
with the {{DDLType}} annotation.
As it can be seen here with the upgrade of the Reflections version to 0.9.12,
the following call
{code:java}
new Reflections(DDL_ROOT).getSubTypesOf(BaseSemanticAnalyzer.class);
{code}
returns among others the {{SemanticAnalyzer}} class leading to the NPE.
Reading through the Javadoc of the {{Reflections}} APIs the fact that
{{SemanticAnalyzer}} appears in the result is the intended behavior. It seems
that the change that led to {{SemanticAnalyzer}} becoming part of the result of
the aforementioned call is the addition of the [expand super types
feature|https://github.com/ronmamo/reflections/commit/ad55f7fdd7c54cd0b583ca275748e3428ece5b96]
introduced in 0.9.11.
It is clear that an upgrade to a Reflections version higher than 0.9.10
requires modifications to the Hive source code.
> Fix NPE in DDLSemanticAnalyzerFactory during compilation
> --------------------------------------------------------
>
> Key: HIVE-26488
> URL: https://issues.apache.org/jira/browse/HIVE-26488
> Project: Hive
> Issue Type: Sub-task
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> *Exception Trace:*
> {noformat}
> java.lang.ExceptionInInitializerError
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzerFactory.getInternal(SemanticAnalyzerFactory.java:62)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzerFactory.get(SemanticAnalyzerFactory.java:41)
> at org.apache.hadoop.hive.ql.Compiler.analyze(Compiler.java:209)
> at org.apache.hadoop.hive.ql.Compiler.compile(Compiler.java:106)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:507)
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:459)
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:424)
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:418)
> {noformat}
> *Cause:*
> {noformat}
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.ddl.DDLSemanticAnalyzerFactory.<clinit>(DDLSemanticAnalyzerFactory.java:84)
> ... 40 more
> {noformat}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
