risdenk commented on code in PR #1466:
URL: https://github.com/apache/solr/pull/1466#discussion_r1144122612


##########
solr/core/src/java/org/apache/solr/handler/component/RealTimeGetComponent.java:
##########
@@ -885,7 +884,7 @@ private static SolrInputDocument 
toSolrInputDocument(SolrDocument doc, IndexSche
           if (!fieldArrayListCreated && doc.getFieldValue(fname) instanceof 
Collection) {
             // previous value was array so we must return as an array even if 
was a single value
             // array
-            out.setField(fname, Lists.newArrayList(val));
+            out.setField(fname, new ArrayList<>(List.of(val)));

Review Comment:
   when I remove the `new ArrayList<>()` This is the error
   
   ```
     2> 162085 ERROR (qtp339291692-2438) [n:127.0.0.1:51699_solr 
c:org.apache.solr.cloud.NestedShardedAtomicUpdateTest_collection s:shard1 
r:core_node6 
x:org.apache.solr.cloud.NestedShardedAtomicUpdateTest_collection_shard1_replica_n2]
 o.a.s.h.RequestHandlerBase java.lang.UnsupportedOperationException
     2>           => java.lang.UnsupportedOperationException
     2>    at 
java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142)
     2> java.lang.UnsupportedOperationException: null
     2>    at java.util.ImmutableCollections.uoe(ImmutableCollections.java:142) 
~[?:?]
     2>    at 
java.util.ImmutableCollections$AbstractImmutableCollection.add(ImmutableCollections.java:147)
 ~[?:?]
     2>    at 
org.apache.solr.common.SolrInputField.addValue(SolrInputField.java:95) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.common.SolrInputDocument.addField(SolrInputDocument.java:104) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.handler.component.RealTimeGetComponent.toSolrInputDocument(RealTimeGetComponent.java:892)
 ~[main/:?]
     2>    at 
org.apache.solr.handler.component.RealTimeGetComponent.toSolrInputDocument(RealTimeGetComponent.java:883)
 ~[main/:?]
     2>    at 
org.apache.solr.handler.component.RealTimeGetComponent.getInputDocument(RealTimeGetComponent.java:794)
 ~[main/:?]
     2>    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.getUpdatedDocument(DistributedUpdateProcessor.java:789)
 ~[main/:?]
     2>    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.doVersionAdd(DistributedUpdateProcessor.java:407)
 ~[main/:?]
     2>    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.lambda$versionAdd$0(DistributedUpdateProcessor.java:357)
 ~[main/:?]
     2>    at 
org.apache.solr.update.VersionBucket.runWithLock(VersionBucket.java:51) 
~[main/:?]
     2>    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:354)
 ~[main/:?]
     2>    at 
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:236)
 ~[main/:?]
     2>    at 
org.apache.solr.update.processor.DistributedZkUpdateProcessor.processAdd(DistributedZkUpdateProcessor.java:279)
 ~[main/:?]
     2>    at 
org.apache.solr.update.processor.LogUpdateProcessorFactory$LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:111)
 ~[main/:?]
     2>    at 
org.apache.solr.handler.loader.JavabinLoader$1.update(JavabinLoader.java:123) 
~[main/:?]
     2>    at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readOuterMostDocIterator(JavaBinUpdateRequestCodec.java:342)
 ~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readIterator(JavaBinUpdateRequestCodec.java:286)
 ~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:338) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:283) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec$StreamingCodec.readNamedList(JavaBinUpdateRequestCodec.java:236)
 ~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.common.util.JavaBinCodec.readObject(JavaBinCodec.java:303) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:283) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.common.util.JavaBinCodec.unmarshal(JavaBinCodec.java:193) 
~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.client.solrj.request.JavaBinUpdateRequestCodec.unmarshal(JavaBinUpdateRequestCodec.java:126)
 ~[solr-solrj-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT 
735623be5eea82a70693aee39819f2baf151aa75 [snapshot build, details omitted]]
     2>    at 
org.apache.solr.handler.loader.JavabinLoader.parseAndLoadDocs(JavabinLoader.java:135)
 ~[main/:?]
     2>    at 
org.apache.solr.handler.loader.JavabinLoader.load(JavabinLoader.java:74) 
~[main/:?]
     2>    at 
org.apache.solr.handler.UpdateRequestHandler$1.load(UpdateRequestHandler.java:101)
 ~[main/:?]
     2>    at 
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:84)
 ~[main/:?]
     2>    at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:224)
 [main/:?]
     ...
   ```



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