dubbo提供者不打印錯誤日誌解決

原因分析：

dubbo默認使用log4j作爲日誌框架，如果你所使用的日誌框架與之不一樣可能出現日誌不出現的情況。

解決：

可通過配置應用的logger屬性解決

//slf4j,jcl,log4j,jdk,log4j2
<dubbo:application logger="log4j2" />

---

舊版本支持log4j2方式：

如果使用的是舊版本的dubbo，不支持log4j2可通過官方提供的配置接口實現log4j2適配器便可以使用。

1、實現適配器

import com.alibaba.dubbo.common.logger.Level;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerAdapter;
import org.apache.logging.log4j.LogManager;

import java.io.File;

public class Log4j2LoggerAdapter implements LoggerAdapter {

    private Level level;

    public Log4j2LoggerAdapter() {

    }

    private static org.apache.logging.log4j.Level toLog4j2Level(Level level) {
        if (level == Level.ALL) {
            return org.apache.logging.log4j.Level.ALL;
        }
        if (level == Level.TRACE) {
            return org.apache.logging.log4j.Level.TRACE;
        }
        if (level == Level.DEBUG) {
            return org.apache.logging.log4j.Level.DEBUG;
        }
        if (level == Level.INFO) {
            return org.apache.logging.log4j.Level.INFO;
        }
        if (level == Level.WARN) {
            return org.apache.logging.log4j.Level.WARN;
        }
        if (level == Level.ERROR) {
            return org.apache.logging.log4j.Level.ERROR;
        }
        return org.apache.logging.log4j.Level.OFF;
    }

    private static Level fromLog4j2Level(org.apache.logging.log4j.Level level) {
        if (level == org.apache.logging.log4j.Level.ALL) {
            return Level.ALL;
        }
        if (level == org.apache.logging.log4j.Level.TRACE) {
            return Level.TRACE;
        }
        if (level == org.apache.logging.log4j.Level.DEBUG) {
            return Level.DEBUG;
        }
        if (level == org.apache.logging.log4j.Level.INFO) {
            return Level.INFO;
        }
        if (level == org.apache.logging.log4j.Level.WARN) {
            return Level.WARN;
        }
        if (level == org.apache.logging.log4j.Level.ERROR) {
            return Level.ERROR;
        }
        return Level.OFF;
    }

    @Override
    public Logger getLogger(Class<?> key) {
        return new Log4j2Logger(LogManager.getLogger(key));
    }

    @Override
    public Logger getLogger(String key) {
        return new Log4j2Logger(LogManager.getLogger(key));
    }

    @Override
    public Level getLevel() {
        return level;
    }

    @Override
    public void setLevel(Level level) {
        this.level = level;
    }

    @Override
    public File getFile() {
        return null;
    }

    @Override
    public void setFile(File file) {
    }
}

 

import com.alibaba.dubbo.common.logger.Logger;

public class Log4j2Logger implements Logger {

    private final org.apache.logging.log4j.Logger logger;

    public Log4j2Logger(org.apache.logging.log4j.Logger logger) {
        this.logger = logger;
    }

    @Override
    public void trace(String msg) {
        logger.trace(msg);
    }

    @Override
    public void trace(Throwable e) {
        logger.trace(e == null ? null : e.getMessage(), e);
    }

    @Override
    public void trace(String msg, Throwable e) {
        logger.trace(msg, e);
    }

    @Override
    public void debug(String msg) {
        logger.debug(msg);
    }

    @Override
    public void debug(Throwable e) {
        logger.debug(e == null ? null : e.getMessage(), e);
    }

    @Override
    public void debug(String msg, Throwable e) {
        logger.debug(msg, e);
    }

    @Override
    public void info(String msg) {
        logger.info(msg);
    }

    @Override
    public void info(Throwable e) {
        logger.info(e == null ? null : e.getMessage(), e);
    }

    @Override
    public void info(String msg, Throwable e) {
        logger.info(msg, e);
    }

    @Override
    public void warn(String msg) {
        logger.warn(msg);
    }

    @Override
    public void warn(Throwable e) {
        logger.warn(e == null ? null : e.getMessage(), e);
    }

    @Override
    public void warn(String msg, Throwable e) {
        logger.warn(msg, e);
    }

    @Override
    public void error(String msg) {
        logger.error(msg);
    }

    @Override
    public void error(Throwable e) {
        logger.error(e == null ? null : e.getMessage(), e);
    }

    @Override
    public void error(String msg, Throwable e) {
        logger.error(msg, e);
    }

    @Override
    public boolean isTraceEnabled() {
        return logger.isTraceEnabled();
    }

    @Override
    public boolean isDebugEnabled() {
        return logger.isDebugEnabled();
    }

    @Override
    public boolean isInfoEnabled() {
        return logger.isInfoEnabled();
    }

    @Override
    public boolean isWarnEnabled() {
        return logger.isWarnEnabled();
    }

    @Override
    public boolean isErrorEnabled() {
        return logger.isErrorEnabled();
    }
}

2、配置spi

在/src/main/resources/META-INF/dubbo目錄下新建文件

文件名爲：com.alibaba.dubbo.common.logger.LoggerAdapter

文件內容爲：log4j2=com.wisedu.wec.cpdaily.config.provider.common.log4j2.Log4j2LoggerAdapter

3、配置dubbo使用logger

//slf4j,jcl,log4j,jdk,log4j2
<dubbo:application logger="log4j2" />

更多擴展實現方式請參看官方說明：http://dubbo.apache.org/zh-cn/docs/dev/impls/logger-adapter.html