Question

我将elasticsearch java客户端从2.3升级到5.1。

此错误日志将继续显示。

ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...

我正在使用log4j2

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.7</version>
</dependency>
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.7</version>
</dependency>

Answer 1

很晚才回答，但是:)如果您不想升级ES，只需将以下依赖项添加到pom：

    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-to-slf4j</artifactId>
        <version>2.8.2</version>
    </dependency>

应该修复它

Answer 2

https://discuss.elastic.co/t/issue-with-elastic-search-5-0-0-noclassdeffounderror-org-apache-logging-log4j-logger/64262/4

这似乎是一个版本问题。它适用于2.6.2。

Answer 3

使用最新的log4j2帮助了我。

<dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.11.1</version>
</dependency>

Answer 4

您需要添加属性文件，如here所示：

appender.console.type = Console
appender.console.name = console
appender.console.layout.type = PatternLayout

rootLogger.level = info
rootLogger.appenderRef.console.ref = console

Answer 5

对我来说，以下解决方案有效。 Ref- https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/_log4j_2_logger.html（原始讨论线程https://github.com/elastic/elasticsearch/pull/25136）

You need to include Log4j 2 dependencies:

    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.11.1</version>
    </dependency>
    And also provide a Log4j 2 configuration file in your classpath. For example, you can add in your src/main/resources project dir a log4j2.properties file like ( I did this): 

    appender.console.type = Console
    appender.console.name = console
    appender.console.layout.type = PatternLayout

    rootLogger.level = info
    rootLogger.appenderRef.console.ref = console

Answer 6

将此依赖项添加到pom.xml

<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.13.2</version>
</dependency>

Elasticsearch“StatusLogger Log4j2找不到日志记录实现。请将log4j-core添加到类路径中。”

6 个答案: