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https://issues.apache.org/jira/browse/PHOENIX-2908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288080#comment-15288080
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James Taylor commented on PHOENIX-2908:
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Nice - I love removing stuff and I love multiple choice :-). Thanks, [~yhxx511]!
> phoenix-core depends on both antlr 3.5 and antlr 2.7.7
> ------------------------------------------------------
>
> Key: PHOENIX-2908
> URL: https://issues.apache.org/jira/browse/PHOENIX-2908
> Project: Phoenix
> Issue Type: Bug
> Reporter: William Yang
> Priority: Minor
> Labels: build
> Fix For: 4.8.0
>
> Attachments: PHOENIX-2908_removeBothAntlr.patch,
> PHOENIX-2908_removeOnlyAntlr2.7.7.patch
>
>
> when executing 'mvn dependency:tree -pl=phoenix-core'. It shows that we
> depends on both antlr-3.5.jar and antlr-2.7.7.jar.
> [INFO] org.apache.phoenix:phoenix-core:jar:4.6-adh6u-SNAPSHOT
> [INFO] +- org.antlr:antlr:jar:3.5:compile
> [INFO] | \- org.antlr:ST4:jar:4.0.7:compile
> [INFO] +- org.antlr:antlr-runtime:jar:3.5:compile
> [INFO] | \- org.antlr:stringtemplate:jar:3.2.1:compile
> [INFO] | \- antlr:antlr:jar:2.7.7:compile
> Moreover, in the final jar file phoenix-4.6.0-HBase-1.1-client.jar, it
> contains both antlr 3.5 and 2.7.7 too. Fortunately they have different
> package name and will not cause unexpected problems. So it does not have any
> negative effects, but it is a existed problem.
> https://github.com/antlr/stringtemplate4/issues/51
> https://github.com/antlr/antlr3/issues/75
> It seems that it is a known issue and has not been solved and never will be
> for antlr 3. I don't know whether it still exists in antlr 4.
> I searched the source code and generated source code and i cannot find
> explicit import for classes in antlr-*.jar, but only antlr-runtime instead.
> Is antlr 3.5 necessary for phoenix?
> I did the following things:
> 1. remove antlr 3.5 dependency from pom
> 2. add exclusion of stringtemplate for antlr-runtime (so it will not have
> the transit dependency of antlr 2.7.7)
>
> Then, both antlr 3.5 and antlr 2.7.7 disappeared. After that, all IT/UTs
> passed. Everything seems to be fine.
> Moreover, I added java parameter '-verbose:class' for sqlline.py and see
> which antlr class is loaded. The result shows that only classes in
> antlr-runtime had been loaded, not any in antlr 3.5/2.7.7.
> So, I think it might be safe to remove dependency of antlr 3.5 and exclude
> stringtemplate from antlr-runtime.
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