Log Uncaught exception in thread – How To Solve Related Issues



Log Uncaught exception in thread – How To Solve Related Issues

Opster Team

Jan-20, Version: 1.7-8.0

 

Before you read this guide, we recommend you run the Elasticsearch Error Check-Up which detects issues in ES that cause log errors. It’s a free tool that requires no installation and takes 2 minutes to complete.

This guide will help you check for common problems that cause the log ” Uncaught exception in thread ” 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: bootstrap, handler and thread.

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 pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them. Among the dozens of checks included are: shards sizes, thread pools, management queue size, search errors, circuit breakers and many more (join over 700 users who use this free tool).

Log Context

Log “Uncaught exception in thread [{}]” classname is ElasticsearchUncaughtExceptionHandler.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

     void onFatalUncaught(final String threadName; final Throwable t) {
        logger.error(() -> new ParameterizedMessage("fatal error in thread [{}]; exiting"; threadName); t);
    }

    void onNonFatalUncaught(final String threadName; final Throwable t) {
        logger.warn(() -> new ParameterizedMessage("uncaught exception in thread [{}]"; threadName); t);
    }

    void halt(int status) {
        AccessController.doPrivileged(new PrivilegedHaltAction(status));
    }






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 Github Issue Number 21162

2 Github Issue Number 27031






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