Reg Apache Solr 8.4.1 error log for Delta Import Handling functionality via REST command.

[postman 3i <po...@gmail.com>]

Hi ,
I am employing Java Web Project to incorporate Delta Import Handling
functionality of Solr with my Collection data objects. I could do
full-import of data to the configured collection via Solr UI, but let the
Java Web App do a routine Delta-Import functionality instructed via
Automated Java Thread, so as to make Collection data availability to
downstream apps to function in an automated manner. But when I hit one of
the collection by -
*http://<1.2.3.4>:8983/solr/OBJECT/dataimport?command=delta-import&clean=false&commit=true&start=0&rows=100000*

But it now I am hitting this error -

2021-12-14 10:53:03.969 ERROR (qtp1546693040-33) [   x:customer]
o.a.s.s.HttpSolrCall
null:java.lang.ClassCastException: java.util.Arrays$ArrayList cannot be
cast to java.lang.String
at
org.apache.solr.handler.dataimport.RequestInfo.<init>(RequestInfo.java:65)
at
org.apache.solr.handler.dataimport.DataImportHandler.handleRequestBody(DataImportHandler.java:135)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:211)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:2596)
at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:799)
at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:578)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:419)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:351)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1711)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1347)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1678)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1249)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:505)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370)
at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:781)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:917)
at java.lang.Thread.run(Thread.java:748)

Kindly share your thoughts/exploration on the above error. Is it an FATAL
error or kind of any WARNING to neglect upon.

Thanks,
GPS