Elasticsearch java api error java.lang.NoClassDefFoundError: org/apache/logging/log4j/Logger

Question

I am using java elasticsearch 5.4 api. When I run sample program I am getting below error

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/Logger
    at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:101)
    at org.elasticsearch.common.xcontent.support.AbstractXContentParser.<init>(AbstractXContentParser.java:57)
    at org.elasticsearch.common.xcontent.json.JsonXContentParser.<init>(JsonXContentParser.java:44)
    at org.elasticsearch.common.xcontent.json.JsonXContent.createParser(JsonXContent.java:103)
    at org.elasticsearch.common.settings.Setting.parseableStringToList(Setting.java:848)
    at org.elasticsearch.common.settings.Setting.lambda$listSetting$27(Setting.java:802)
    at org.elasticsearch.common.settings.Setting.listSetting(Setting.java:807)
    at org.elasticsearch.common.settings.Setting.listSetting(Setting.java:802)
    at org.elasticsearch.common.network.NetworkService.<clinit>(NetworkService.java:50)
    at org.elasticsearch.client.transport.TransportClient.newPluginService(TransportClient.java:98)
    at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:126)
    at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:268)
    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:125)
    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:111)
    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:101)
    at com.ibm.esclient.ESClient.main(ESClient.java:33)
Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Logger
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

My dependencies are

<dependencies>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>5.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.8</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.8
            </version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
            <version>2.8</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-web</artifactId>
            <version>2.8</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-to-slf4j</artifactId>
            <version>2.8</version>
        </dependency>
        <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.1.7</version>
</dependency>
    </dependencies>

Basically I have tried to add all possible log4j loggers here but to no avail. Quite frustrating, need help please!!

Some of those dependencies are outdated. For instance logback-classic is at version 1.2.3. — Johan Tidén
– Johan Tidén, Commented May 25, 2017 at 12:47

Shades88 · Accepted Answer · 2017-05-25 13:47:48Z

2

A small mistake led to this error. I had specified as test. I removed it and this started working

answered May 25, 2017 at 13:47

Shades88

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Dmitri Korobtsov · Accepted Answer · 2018-03-10 21:52:07Z

0

Just in case - if logging was configured properly and problem only occurs after adding ES dependency would not it be easier solution to just add exclusion for ES log4j dependency (instead of adding more loggers)?

In gradle it's something like:

compile ('org.elasticsearch.client:elasticsearch-rest-high-level-client:6.2.2'){
    exclude group: 'org.apache.logging.log4j'
}

Solves NoClassDefFoundError exceptions just fine.

answered Mar 10, 2018 at 21:52

Dmitri Korobtsov

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