很长一段时间以来,我一直担心记录器会出现同样的错误,但现在才开始写下来。这是错误:
SLF4J(W): No SLF4J providers were found.
SLF4J(W): Defaulting to no-operation (NOP) logger implementation
SLF4J(W): See https://www.slf4j.org/codes.html#noProviders for further details.
这个问题有一个解决方案,就是为记录器添加依赖项,但是这个解决方案不适合我,因为我无论如何都添加了logback依赖项,而且Spring也有记录器,我也出现了这个错误。
这是我的项目的代码:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.aoizora</groupId>
<artifactId>camel-app</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>22</maven.compiler.source>
<maven.compiler.target>22</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>4.6.0</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.5.6</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
</dependency>
</dependencies>
</project>
主要类别:
package aoizora;
import org.apache.camel.CamelContext;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.DefaultCamelContext;
public class Main
{
public static void main(String[] args) throws Exception
{
CamelContext camel = new DefaultCamelContext();
camel.addRoutes(new RouteBuilder() {
@Override
public void configure() throws Exception
{
from("timer:foo")
.log("Hello, Camel");
}
});
camel.start();
Thread.sleep(10000);
camel.stop();
}
}
可以看到,pom.xml添加了logback,但是还是出现错误。虽然在这个视频https://www.youtube.com/watch?v=ZY3dJ3e9vDo依赖项是相同的,但没有错误。
如何消除这个错误,让它看起来很漂亮?
您的依赖项不包含在主应用程序中,因为您为其分配了一个测试范围,仅在运行测试时使用。删除
<scope>test</scope>以在常规构建中使用它。