使用 Eclipse 4.31 的 logback 记录器 (1.5.0) -> 未找到 SLF4J 提供程序

问题描述 投票：0回答：1

我使用 eclipse 4.31 和 slf4j.api 2.0.12 和 ch.qos.logback.classic 1.5.0。但如果我想记录一些东西，我会得到以下信息：

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.

我创建了此处描述的 eclipse RCP： https://www.vogella.com/tutorials/EclipseRCP/article.html logback 记录器与这里类似（我使用更高版本）： https://www.vogella.com/tutorials/EclipseLogging/article.html

这里是目标平台：

<target name="target" sequenceNumber="43">
<locations>
    <location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="true" type="InstallableUnit">
        <repository location="https://download.eclipse.org/eclipse/updates/4.31/"/>
        <unit id="org.eclipse.jdt.feature.group" version="3.19.400.v20240229-0520"/>                                                                                                
        <unit id="org.eclipse.pde.feature.group" version="3.15.300.v20240229-0520"/>                                                                                                
        <unit id="org.eclipse.platform.ide" version="4.31.0.I20240229-0520"/>                                                                                               
        <unit id="org.eclipse.rcp.feature.group" version="4.31.0.v20240229-0520"/>                                                                                              
        <unit id="org.eclipse.sdk.ide" version="4.31.0.I20240229-0520"/>                                                                       
        <unit id="org.eclipse.jdt.source.feature.group" version="3.19.400.v20240229-0520"/>            
        <unit id="org.eclipse.pde.source.feature.group" version="3.15.300.v20240229-0520"/>                                                       
        <unit id="org.eclipse.rcp.source.feature.group" version="4.31.0.v20240229-0520"/>
        <unit id="org.eclipse.emf.ecore.feature.group" version="2.37.0.v20240203-0859"/>
        <unit id="org.eclipse.ecf.core.feature.feature.group" version="1.6.2.v20231021-2127"/>
        <unit id="org.eclipse.emf.common.feature.group" version="2.31.0.v20231210-0956"/>
        <unit id="org.eclipse.equinox.sdk.feature.group" version="3.23.1100.v20240218-1855"/>
    </location>
    <location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="true" type="InstallableUnit">
        <repository location="https://download.eclipse.org/releases/2024-03"/>
        <unit id="org.eclipse.m2e.logback.feature.feature.group" version="2.6.0.20240217-1525"/>
    </location>
</locations>
</target>

清单：

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Rcp
Bundle-SymbolicName: com.example.e4.rcp;singleton:=true
Bundle-Version: 1.0.0.qualifier
Bundle-Vendor: EXAMPLE
Require-Bundle: org.eclipse.swt,
 org.eclipse.e4.ui.model.workbench,
 org.eclipse.jface,
 org.eclipse.e4.ui.services,
 org.eclipse.e4.ui.workbench,
 org.eclipse.e4.core.di,
 org.eclipse.e4.ui.di,
 org.eclipse.e4.core.contexts,
 org.eclipse.core.runtime,
 slf4j.api;bundle-version="2.0.12",
 ch.qos.logback.classic;bundle-version="1.5.0",
 ch.qos.logback.core;bundle-version="1.5.0"
Bundle-RequiredExecutionEnvironment: JavaSE-17
Import-Package: jakarta.annotation;version="[2.1.0,3.0.0)",
 jakarta.inject;version="[2.0.0,3.0.0)"
Automatic-Module-Name: com.example.e4.rcp

带有日志记录的类（转到菜单->帮助->关于执行此代码）：

package com.example.e4.rcp.handlers;

import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.swt.widgets.Shell;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AboutHandler {
        
    @Execute
    public void execute(Shell shell) {
        
        Logger LOG = LoggerFactory.getLogger(AboutHandler.class);
    }
}

产品：

<product name="com.example.e4.rcp" id="com.example.e4.rcp.product" application="org.eclipse.e4.ui.workbench.swt.E4Application" version="1.0.0.qualifier" type="mixed" includeLaunchers="true" autoIncludeRequirements="true">

   <configIni use="default">
   </configIni>

   <launcherArgs>
      <programArgs>-clearPersistedState
      </programArgs>
      <vmArgsMac>-XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts
      </vmArgsMac>
   </launcherArgs>

   <windowImages/>

   <plugins>
      <plugin id="com.example.e4.rcp"/>
   </plugins>

   <features>
      <feature id="org.eclipse.e4.rcp"/>
      <feature id="org.eclipse.m2e.logback.feature" installMode="root"/>
   </features>


</product>

根据这里的手册，类路径上的logback-classic.jar将解决问题： https://www.slf4j.org/codes.html#noProviders

我想说 ch.qos.logback.classic 是类路径中的 logback-classic.jar。但问题依然存在。

eclipse logback slf4j
1个回答
0
投票

问题在于 org.slf4j.LoggerFactory 想要使用“LoggerFactory.class.getClassLoader()”加载 SLF4JServiceProvider。这是 org.eclipse.osgi.internal.loader.EquinoxClassLoader。这样就不会找到 SLF4JServiceProvider。

我找到了解决此问题的方法，其中我使用其他类加载器：

将 logback 添加到类路径：

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Test2
Bundle-SymbolicName: test2;singleton:=true
Bundle-Version: 1.0.0.qualifier
Eclipse-BundleShape: jar
Require-Bundle: org.eclipse.swt,
 org.eclipse.e4.ui.model.workbench,
 org.eclipse.jface,
 org.eclipse.e4.ui.services,
 org.eclipse.e4.ui.workbench,
 org.eclipse.e4.core.di,
 org.eclipse.e4.ui.di,
 org.eclipse.e4.core.contexts,
 org.eclipse.core.runtime,
 slf4j.api;bundle-version="2.0.12",
 ch.qos.logback.classic;bundle-version="1.5.0",
 ch.qos.logback.core;bundle-version="1.5.0"
Bundle-RequiredExecutionEnvironment: JavaSE-17
Import-Package: jakarta.annotation;version="[2.1.0,3.0.0)",
 jakarta.inject;version="[2.0.0,3.0.0)",
 org.slf4j;version="[2.0.0,3.0.0]"
Automatic-Module-Name: test2
Bundle-ActivationPolicy: lazy
Bundle-ClassPath: lib/ch.qos.logback.classic_1.5.6.jar,
 lib/ch.qos.logback.core_1.5.6.jar,
 lib/slf4j.api_2.0.13.jar,
 .

初始化 SLF4JServiceProvider 的代码：

    private static void initSLF4JServiceProvider() {
        
        ServiceLoader<SLF4JServiceProvider> serviceLoader = ServiceLoader.load(SLF4JServiceProvider.class);
        
        // init service provider manually
        Optional<SLF4JServiceProvider> serviceProviderOpt = serviceLoader.findFirst();       
        if (serviceProviderOpt.isEmpty()) {
            System.err.println("LogbackInitializer: No SLF4JServiceProvider found to init logging");
            return;
        }      
        SLF4JServiceProvider slf4jServiceProvider = serviceProviderOpt.get();
        slf4jServiceProvider.initialize();
        ILoggerFactory loggerFactory = slf4jServiceProvider.getLoggerFactory();

        Logger logger = loggerFactory.getLogger("test");
        logger.info("Test");
        
    }
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