[HIVE-22190] Class HiveMetaStoreClient fails to instantiate when running on Java 11

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.3.6, 3.1.2
• Fix Version/s: 2.3.7
• Component/s: Hive
• Labels: pull-request-available

Environment

Java Version: "11.0.3" 2019-04-16 LTS

• Target Version/s: 2.3.7
• Flags: Patch
• Assignee: Francisco Guerrero
• Reporter: Francisco Guerrero
• Created: 11/Sep/19 07:57
• Updated: 25/Jun/23 07:36
• Resolved: 11/Sep/19 13:56

Description

HiveMetaStoreClient fails to initialize in JDK with error:
Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient with cause
class [Ljava.lang.Object; cannot be cast to class [Ljava.net.URI; ([Ljava.lang.Object; and [Ljava.net.URI; are in module java.base of loader 'bootstrap')

This is due the way toArray is being invoked. The compiles and runs well on Java 8. But when running in Java 11, the class instantiation fails. This is a snippet of code to reproduce the issue:

URI metastoreUris[] = new URI[2];
try {
    metastoreUris[0] = new URI("http://google.com");
} catch (URISyntaxException e) {
    e.printStackTrace();
}
List uriList = Arrays.asList(metastoreUris);
Collections.shuffle(uriList);
metastoreUris = (URI[]) uriList.toArray();

This is causing any client using HiveMetaStoreClient fail, because the constructor is unable to initialize. The type erasure is handled differently in Java 8 and Java 11.

Issue Links

• duplicates: HIVE-21508 ClassCastException when initializing HiveMetaStoreClient on JDK10 or newer
• links to: GitHub Pull Request #765
• links to: GitHub Pull Request #766