JNA not found native methods and handlers will be disabled – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when the Java Native Access (JNA) library is not found in your OpenSearch environment. JNA is essential for certain native functionalities like memory locking. Without it, these features are disabled, potentially affecting performance. To resolve this, ensure that the JNA library is correctly installed and the classpath is properly set so OpenSearch can locate it. Alternatively, you can include the JNA jar file in the OpenSearch lib directory. Also, check for any permissions issues that might prevent OpenSearch from accessing the JNA library.

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This guide will help you check for common problems that cause the log ” JNA not found. native methods and handlers will be disabled. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: bootstrap.

Log Context

Log “JNA not found. native methods and handlers will be disabled.” classname is JNAKernel32Library.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        if (Constants.WINDOWS) {
            try {
                logger.debug("windows/Kernel32 library loaded");
            } catch (NoClassDefFoundError e) {
                logger.warn("JNA not found. native methods and handlers will be disabled.");
            } catch (UnsatisfiedLinkError e) {
                logger.warn("unable to link Windows/Kernel32 library. native methods and handlers will be disabled.");


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