ConsoleAppender实例化无法工作:具有私有访问权限

Question

类ConsoleAppender的实例化不起作用。

import org.apache.logging.log4j.core.appender.ConsoleAppender;

public class Application {
        private static ConsoleAppender consoleAppender = new ConsoleAppender();
        public static void main(String[] args) {}
}

信息弹出错误消息：

'ConsoleAppender(java.lang.String, org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, org.apache.logging.log4j.core.Filter, org.apache.logging.log4j.core.appender.OutputStreamManager, boolean, org.apache.logging.log4j.core.appender.ConsoleAppender.Target, org.apache.logging.log4j.core.config.Property[])' has private access in 'org.apache.logging.log4j.core.appender.ConsoleAppender'

Answer 1

LOG4J ConsoleAppender有一个私有构造函数。

private ConsoleAppender(
    final String name,
    final Layout<? extends Serializable> layout,
    final Filter filter,
    final OutputStreamManager manager,
    final boolean ignoreExceptions, final Target target,
    final Property[] properties
) { ... }

因此，您需要使用自己的构建器来构建它。

ConsoleAppender.newBuilder()
    .setLayout(...)
    .setName("Example")
    .build()

Answer 2

较早版本的log4j有一个公共构造函数。现在他走了。使用静态方法或构建器代替。

https://logging.apache.org/log4j/log4j-2.3/log4j-core/apidocs/org/apache/logging/log4j/core/appender/ConsoleAppender.html