Cannot cast value of type to parameter type – Elasticsearch Error How To Solve Related Issues



Cannot cast value of type to parameter type – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many errors 

 

This guide will help you check for common problems that cause the log “Cannot cast value of type to parameter type” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: parser, plugin.


Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”Cannot cast value [{}] of type [{}] to parameter type [{}]”classname  is ExpressionBuilder.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

return new Literal(source; param.value; dataType);
  }
  // otherwise we need to make sure that xcontent-serialized value is converted to the correct type
  try {
  if (canConvert(sourceType; dataType) == false) {
  throw new ParsingException(source; "Cannot cast value [{}] of type [{}] to parameter type [{}]"; param.value; sourceType;
  dataType);
  }
  return new Literal(source; converterFor(sourceType; dataType).convert(param.value); dataType);
  } catch (QlIllegalArgumentException ex) {
  throw new ParsingException(ex; source; "Unexpected actual parameter type [{}] for type [{}]"; sourceType; param.type);

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 why HashMap Values are not cast in List? -views 77,173 ,score 72

Could not cast value of type 'UITableViewCell' to '(AppName).(CustomCellName)' -views   42,581,score 35



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