You can ask Solr to replace it:
https://lucene.apache.org/solr/guide/7_6/schema-api.html
Note: it throws an error if it does not exist.
Or you can delete (if exist) and add it.
> Am 20.01.2019 um 04:47 schrieb Arunan Sugunakumar <arunans...@cse.mrt.ac.lk>:
>
> Hi,
>
> I used SolrJ 7.2.1 and Apache Solr 7.2.1 in one of my projects. Prior to
> data indexing, I create the fields and field types using SchemaAPI in
> SolrJ. If a same field name is repeated, solr did not return an exception,
> but simply ignored it (or over-rid it). But I tried Solr 7.6.0 with my
> project and it returned exceptions. I went over the Solr logs and found the
> below error. It seems that I cannot create a field again and again. I would
> like to know whether I should do something different to overcome this
> problem.
>
> 2019-01-19 16:46:43.580 ERROR (qtp952486988-18) [ x:biotestmine-search]
> o.a.s.h.RequestHandlerBase
> org.apache.solr.api.ApiBag$ExceptionWithErrObject: error processing
> commands, errors: [{add-field={indexed=true, stored=false, name=Category,
> type=analyzed_string, multiValued=true, required=false},
> errorMessages=[Field 'Category' already exists.
> ]}],
> at
> org.apache.solr.handler.SchemaHandler.handleRequestBody(SchemaHandler.java:92)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2541)
> at
> org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:709)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:515)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
> 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:1595)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)
> at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
> 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:531)
> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
> at
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
> at
> org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
> at
> org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
> at
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
> at
> org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
> at java.lang.Thread.run(Thread.java:748)
>
>
>
> Thanks in advance
>
> Regards,
> Arunan
>
> *Sugunakumar Arunan*
> Undergraduate - CSE | UOM
>
> Email : aruna <aru...@wso2.com>ns...@cse.mrt.ac.lk
> Mobile : 0094 766016272 <076%20601%206272>
> LinkedIn : https://www.linkedin.com/in/arunans23/
