Using the Solr import utility, you can receive an error like the following (full error below):
null:org.apache.solr.common.SolrException: Unable to invoke function processAdd in script: update-script.js: Can't unambiguously select between fixed arity signatures [(java.lang.String, java.io.Reader), (java.lang.String, java.lang.String)] of the method org.apache.solr.analysis.TokenizerChain.tokenStream for argument types [java.lang.String, null]
Search for this leads you to documentation for Nashorn, the Javascript interpreter in the JVM.
The reason that this runs in Solr is that it is used to let you write Javascript code that can run in the indexing process.
I have found that is very easy to misconfigure Solr to trigger this, but in ways that fail catastrophically, like you’ve found.
One simple cause of this is to add a core that already exists (to try to make it show up) but not setting both the instance and config directories – this causes it to half use the old core, and half the new.
To fix this, you need to shut down solr, delete “new_core” from “\solr-5.5.0\server\solr” and start it back up.
null:org.apache.solr.common.SolrException: Unable to invoke function processAdd in script: update-script.js: Can't unambiguously select between fixed arity signatures [(java.lang.String, java.io.Reader), (java.lang.String, java.lang.String)] of the method org.apache.solr.analysis.TokenizerChain.tokenStream for argument types [java.lang.String, null] at org.apache.solr.update.processor.StatelessScriptUpdateProcessorFactory$ScriptUpdateProcessor.invokeFunction(StatelessScriptUpdateProcessorFactory.java:432) at org.apache.solr.update.processor.StatelessScriptUpdateProcessorFactory$ScriptUpdateProcessor.processAdd(StatelessScriptUpdateProcessorFactory.java:373) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.LanguageIdentifierUpdateProcessor.processAdd(LanguageIdentifierUpdateProcessor.java:206) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.AddSchemaFieldsUpdateProcessorFactory$AddSchemaFieldsUpdateProcessor.processAdd(AddSchemaFieldsUpdateProcessorFactory.java:335) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:117) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:117) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:117) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:117) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.FieldNameMutatingUpdateProcessorFactory$1.processAdd(FieldNameMutatingUpdateProcessorFactory.java:74) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:117) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:931) at org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:1086) at org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:709) at org.apache.solr.update.processor.LogUpdateProcessorFactory$LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:103) at org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:48) at org.apache.solr.update.processor.AbstractDefaultValueUpdateProcessorFactory$DefaultValueUpdateProcessor.processAdd(AbstractDefaultValueUpdateProcessorFactory.java:93) at org.apache.solr.handler.loader.JsonLoader$SingleThreadedJsonLoader$1.handle(JsonLoader.java:230) at org.apache.solr.common.util.JsonRecordReader$Node.handleObjectStart(JsonRecordReader.java:362) at org.apache.solr.common.util.JsonRecordReader$Node.parse(JsonRecordReader.java:287) at org.apache.solr.common.util.JsonRecordReader$Node.access$200(JsonRecordReader.java:153) at org.apache.solr.common.util.JsonRecordReader.streamRecords(JsonRecordReader.java:138) at org.apache.solr.handler.loader.JsonLoader$SingleThreadedJsonLoader.handleSplitMode(JsonLoader.java:208) at org.apache.solr.handler.loader.JsonLoader$SingleThreadedJsonLoader.processUpdate(JsonLoader.java:125) at org.apache.solr.handler.loader.JsonLoader$SingleThreadedJsonLoader.load(JsonLoader.java:113) at org.apache.solr.handler.loader.JsonLoader.load(JsonLoader.java:76) at org.apache.solr.handler.UpdateRequestHandler$1.load(UpdateRequestHandler.java:94) at org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:69) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:155) at org.apache.solr.core.SolrCore.execute(SolrCore.java:2082) at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:670) at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:458) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:225) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:183) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.lang.String, java.io.Reader), (java.lang.String, java.lang.String)] of the method org.apache.solr.analysis.TokenizerChain.tokenStream for argument types [java.lang.String, null] at jdk.internal.dynalink.beans.OverloadedMethod.throwAmbiguousMethod(OverloadedMethod.java:225) at jdk.nashorn.internal.scripts.Script$Recompilation$7593$244A$\^eval\_.processAdd(:81) at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:625) at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494) at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393) at jdk.nashorn.api.scripting.ScriptObjectMirror.callMember(ScriptObjectMirror.java:199) at jdk.nashorn.api.scripting.NashornScriptEngine.invokeImpl(NashornScriptEngine.java:383) at jdk.nashorn.api.scripting.NashornScriptEngine.invokeFunction(NashornScriptEngine.java:190) at org.apache.solr.update.processor.StatelessScriptUpdateProcessorFactory$ScriptUpdateProcessor.invokeFunction(StatelessScriptUpdateProcessorFactory.java:424) ... 61 more Last Check: 6/5/2016, 6:39:28 PM