spring boot 1.4中的logback解析错误

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
</dependency>

# 设置日志级别
logging.level.root=INFO
logging.level.com.example=DEBUG

# 指定日志输出目录
logging.file=/path/to/logfile.log

# 指定日志输出格式
logging.pattern.console=%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
logging.pattern.file=%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ExampleClass {
    private static final Logger logger = LoggerFactory.getLogger(ExampleClass.class);

    public void exampleMethod() {
        logger.debug("Debug message");
        logger.info("Info message");
        logger.warn("Warning message");
        logger.error("Error message");
    }
}