use logback in client error

[heshengjun811]

I use logback Logappender in my client , but integrate to run has error, this info is

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class org.apache.rocketmq.client.log.ClientLogger
at org.apache.rocketmq.client.producer.DefaultMQProducer.(DefaultMQProducer.java:63)
at org.apache.rocketmq.client.producer.DefaultMQProducer.(DefaultMQProducer.java:145)
at com.maoge.demo._01_hello.ProducerDemo.main(ProducerDemo.java:14)

logback.xml

<configuration>

<appender name="mqAppender1" class="org.apache.rocketmq.logappender.logback.RocketmqLogbackAppender">
    <tag>TagA</tag>
    <topic>01_hello</topic>
    <producerGroup>maoge</producerGroup>
    <nameServerAddress>192.168.48.102:9876</nameServerAddress>
    <layout>
        <pattern>%date %p %t - %m%n</pattern>
    </layout>
</appender>
<root level="info">
    <appender-ref ref="mqAppender1" />
</root>

pom.xml

<dependencies>

    <dependency>
        <groupId>org.apache.rocketmq</groupId>
        <artifactId>rocketmq-client</artifactId>
        <version>4.7.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.rocketmq</groupId>
        <artifactId>rocketmq-logappender</artifactId>
        <version>4.7.0</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.12</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>1.2.3</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.3</version>
    </dependency>
</dependencies>

[imaffe]

Could you please provide a small but detailed demo to reproduce this bug including testing environment, steps to take? Would be nice for use to investigate further into this problem.

Intuitively, this looks like a jar dependency conflicts to me, maybe we can start from here 😄

[heshengjun811]

Could you please provide a small but detailed demo to reproduce this bug including testing environment, steps to take? Would be nice for use to investigate further into this problem.

Intuitively, this looks like a jar dependency conflicts to me, maybe we can start from here 😄

Thank Your reply, https://github.com/heshengjun811/rocketmq-demo.git this is demo

since use RocketmqLogbackAppender in my logback.xml, it`s happens error when I start Producer

[imaffe]

@heshengjun811 you can try add this to your logback.xml

    <appender name="mqAsyncAppender1" class="ch.qos.logback.classic.AsyncAppender">
        <queueSize>1024</queueSize>
        <discardingThreshold>80</discardingThreshold>
        <maxFlushTime>2000</maxFlushTime>
        <neverBlock>true</neverBlock>
        <appender-ref ref="mqAppender1"/>
    </appender>

according to logback example

The whole logback.xml looks like

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <appender name="mqAppender1" class="org.apache.rocketmq.logappender.logback.RocketmqLogbackAppender">
        <tag>TagA</tag>
        <topic>01_test</topic>
        <producerGroup>group1</producerGroup>
        <nameServerAddress>127.0.0.1:9876</nameServerAddress>
        <layout>
            <pattern>%date %p %t - %m%n</pattern>
        </layout>
    </appender>
    <appender name="mqAsyncAppender1" class="ch.qos.logback.classic.AsyncAppender">
        <queueSize>1024</queueSize>
        <discardingThreshold>80</discardingThreshold>
        <maxFlushTime>2000</maxFlushTime>
        <neverBlock>true</neverBlock>
        <appender-ref ref="mqAppender1"/>
    </appender>
    <root>
        <level value="debug"/>
        <appender-ref ref="mqAppender1"/>
    </root>
    <logger name="testLogger" level="debug" additivity="true">
        <appender-ref ref="mqAppender1"/>
    </logger>
</configuration>

Once I added this, it will work properly. The reason for NoClassDefFoundError was because we missed some configuration entries, the static initialization process of some class (I don't know which exact class it is) failed, and throws NoClassDefFoundError.

[imaffe]

I will close this issue for now. But if you have any further questions or the solution provided above doesn't work for you, feel free to reopen this issue~

[09094080-Tao-Jiao]

there's something wrong:

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class org.apache.rocketmq.client.log.ClientLogger
at org.apache.rocketmq.client.producer.DefaultMQProducer.(DefaultMQProducer.java:63)
at org.apache.rocketmq.client.producer.DefaultMQProducer.(DefaultMQProducer.java:145)
at com.maoge.demo.ProducerDemo.main(ProducerDemo.java:9)

logback.xml

TagA 01_test group1 127.0.0.1:9876 %date %p %t - %m%n 1024 80 2000 true