---
title: Troubleshooting
description: Missing required property exception in a response, NoSuchMethodError when creating a client, Apache http-client I/O reactor errors, Could not resolve...
url: https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting
---

# Troubleshooting
## Exceptions

- [Missing required property exception in a response](https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting/missing-required-property)
- [NoSuchMethodError when creating a client](https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting/no-such-method-request-options)
- [Apache http-client I/O reactor errors](https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting/io-reactor-errors)
- [Could not resolve dependencies](https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting/could-not-resolve-dependencies)
- [NoClassDefFoundError: org/apache/commons/logging/LogFactory](https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting/no-class-def-found-error)


## Miscellaneous

- [Serializing aggregations and suggestions without typed keys](https://www.elastic.co/elastic/docs-builder/docs/2422/reference/elasticsearch/clients/java/troubleshooting/serialize-without-typed-keys)