Question

我正在使用logback / slf4j来处理我的应用程序中的日志记录。在我开始使用EJB之前，一切都运行良好。一旦我将无状态EJB添加到我的应用程序，记录器就开始忽略我的logback.xml并停止使用我的appender。我切换到编程记录器配置以查看错误，现在当我尝试在EJB中使用我的记录器时，我收到以下错误：

org.slf4j.impl.JDK14LoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext

来自这条线：

LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();

是否需要任何特殊配置才能使用logback来处理EJB？如果重要的话，我正在使用glassfish v3进行部署。

Answer 1

这看起来非常接近this thread中描述的问题，我怀疑类似的类加载问题。由于logback加载logback.xml的方式（更准确地说是它检索ClassLoader的方式），它可能无法获取其配置文件并回退到默认的BasicConfiguration。

不确定如何打包代码，但建议的解决方法是将logback.xml包含在EAR库中。如果您没有使用EAR包装，请尝试识别用于查看logback.xml文件放置位置的类加载器。

最后，这可能是回归中的问题。但是没有检查他们的问题跟踪器。

更新：如果您使用war包装，请尝试将GlassFish配置为在委托之前首先使用子类加载器。在sun-web.xml：

中
<sun-web-app> <class-loader delegate="false"/> </sun-web-app>

<击>

更新：我在我这边做了一点测试......我无法重现你的问题。我已经为Java EE 6 webapp创建了一个项目，它具有以下结构：

$ tree sample sample |-- pom.xml `-- src `-- main |-- java | `-- com | `-- stackoverflow | `-- q2418355 | |-- SimpleEJB.java | `-- SimpleServlet.java |-- resources | `-- logback.xml `-- webapp |-- META-INF | `-- MANIFEST.MF |-- WEB-INF | `-- lib `-- index.jsp

我的pom.xml看起来像：

<?xml version="1.0" encoding="UTF-8"?> <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <modelVersion>4.0.0</modelVersion> <groupId>com.stackoverflow.q2418355</groupId> <artifactId>sample</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>sample Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>6.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.7</version> <scope>test</scope> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>0.9.18</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.5.11</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.0.2</version> <configuration> <source>1.6</source> <target>1.6</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>2.1-beta-1</version> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> </plugins> <finalName>sample</finalName> </build> </project>

SimpleEJB.java的代码是：

package com.stackoverflow.q2418355; import javax.ejb.Stateless; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @Stateless public class SimpleEJB { private static Logger logger = LoggerFactory.getLogger(SimpleEJB.class); public String sayHello(String name) { logger.debug(">> sayHello()"); logger.debug("<< sayHello()"); return "Hello " + name + "!!!"; } }

SimpleServlet.java的代码是：

package com.stackoverflow.q2418355; import java.io.IOException; import java.io.PrintWriter; import javax.ejb.EJB; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet(urlPatterns = { "/SimpleServlet" }) public class SimpleServlet extends HttpServlet { @EJB SimpleEJB bean; private static Logger logger = LoggerFactory.getLogger(SimpleServlet.class); @Override public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { logger.debug(">> doGet()"); PrintWriter out = response.getWriter(); out.println("<html><body>"); out.println("<h2>Serving at: " + request.getContextPath() + "</h2>"); out.println("<h2>Invoking EJB: " + bean.sayHello("Duke") + "</h2>"); out.println("</body></html>"); logger.debug("<< doGet()"); } }

index.jsp的代码是：

<html> <body> <h2>Hello World!</h2> Invoke the Servlet by clicking <a href="SimpleServlet">here</a>. </body> </html>

我的logback.xml看起来像：

<configuration> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern> </layout> </appender> <appender name="FILE" class="ch.qos.logback.core.FileAppender"> <File>/tmp/logs/testFile.log</File> <Append>true</Append> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</Pattern> </layout> </appender> <logger name="com.stackoverflow.q2418355" level="TRACE"/> <root level="debug"> <appender-ref ref="STDOUT" /> <appender-ref ref="FILE" /> </root> </configuration>

我的logback.xml获得了属性加载，并在调用servlet时得到以下跟踪（取自我的日志文件）：

10913 [http-thread-pool-8080-(1)] DEBUG com.stackoverflow.q2418355.SimpleServlet - >> doGet() 10928 [http-thread-pool-8080-(1)] DEBUG com.stackoverflow.q2418355.SimpleEJB - >> sayHello() 10928 [http-thread-pool-8080-(1)] DEBUG com.stackoverflow.q2418355.SimpleEJB - << sayHello() 10932 [http-thread-pool-8080-(1)] DEBUG com.stackoverflow.q2418355.SimpleServlet - << doGet()

我也尝试将EJB打包在自己的JAR中并部署在WEB-INF/lib中并获得相同的结果，它只是起作用。你能发现任何明显的区别吗？也许上传你的应用程序的简化版本（很可能是错误报告BTW所必需的。）

我在Eclipse 3.5下运行GlassFish v3（使用GlassFish v3插件）。

Answer 2

org.slf4j.impl.JDK14LoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext异常表明SLF4J没有绑定到logback-classic而是绑定到slf4j-jdk14。简而言之，回归代码不应该受到责备，因为它没有被执行也没有被调用。

看起来GFv3正在将slf4j-jdk14.jar导出到您的应用程序中，从而覆盖了您选择的日志后端，在这种情况下进行了回退。这是app服务器无意中对用户做出选择的场景之一。

如果GFv3确实对最终用户施加了SLF4J绑定，那么这就是GFv3开发人员必须解决的GFv3问题。我可能错了，但我认为他们认为最终用户不希望任何其他日志记录功能超出java.util.logging提供的功能，只需在GFv3中捆绑slf4j-jdk14。用户需要联系他们并抱怨他们的假设不正确。他们也可能意识到这个问题，并且已经提供了解决方法......

Answer 3

基本上问题是应用服务器使用提供了slf4j并且你尝试使用它会转到应用服务器slf4j绑定而不是你想要的那个。

难道你不能在Glassfish中使用slf4j绑定吗？

Answer 4

以下是完全相关的相关代码：

登录EJB：

@Stateless 
@Interceptors(LoggingInterceptor.class)
public class LoginEJB
{
    @PersistenceContext(unitName = "persistence")
    private EntityManager em;

    public User getUser(String username)
    {
        try
        {
            Query query = em.createQuery("Select u from User u where u.userName = '" + username + "'");
            User user = (User) query.getSingleResult();
            return user;
        } catch (NoResultException e)
        {
            return null;
        }

    }
}

我的日志代码所在的拦截器：

import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class LoggingInterceptor
{
    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @AroundInvoke
    public Object logMethod(InvocationContext ic) throws Exception
    {

        logger.info("[{}] Entering - {}()", ic.getTarget().toString() , ic.getMethod().getName());
        try
        {
            return ic.proceed();
        } finally
        {
           logger.info("[{}] Exiting - {}()", ic.getTarget().toString() , ic.getMethod().getName());
        }
    }
}

logback.xml

<configuration scan="true">
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{HH:mm:ss.SSS} [%-5level] [%logger{36}] - %msg%n</Pattern>
        </layout>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>c:\ItamLogs\log.txt</File>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>c:\ItamLogs\Archive\log-%d{yyyy-MM-dd}.txt</FileNamePattern>
        </rollingPolicy>

        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>[%-5level] - %d{HH:mm:ss.SSS} [%logger{35}] - %msg%n</Pattern>
        </layout>
    </appender>

    <logger name="org.hibernate">
        <level value="WARN"/>
    </logger>

    <root level="DEBUG">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>

jsf2.0支持bean。

@ManagedBean
public class LoginBacking extends AbstractBacking
{
    @NotEmpty(message = "User Name required.")
    private String username;
    @NotEmpty(message = "Password required.")
    private String password;
    @EJB
    private LoginEJB loginEJB;

    public String getPassword()
    {
        return password;
    }

    public void setPassword(String password)
    {
        this.password = password;
    }

    public String getUsername()
    {
        return username;
    }

    public void setUsername(String username)
    {
        this.username = username;
    }

    public String performLogin()
    {
        String result = "login";
        User user = loginEJB.getUser(username);

        if(null == user || !user.getPassword().equals(password))
        {
            this.getFacesContext().addMessage("login-form:button-submit", new FacesMessage("The User Name or Password entered is incorrect."));
            return result;
        }

        this.setCurrentUser(user);
        result = "success";
        return result;
    }
}

我有一个

的jsf页面

<span id="submit-button">
  <h:commandButton id="button-submit" value="Sign On" action="#{loginBacking.performLogin}" />
</span>

最后我的pom

<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>com.test</groupId>
    <artifactId>tester</artifactId>
    <version>1.0/version>

    <name>Code</name>

    <packaging>war</packaging>


    <repositories>
        <repository>
            <id>maven2-repository.dev.java.net</id>
            <name>Java.net Repository for Maven</name>
            <url>http://download.java.net/maven/2/</url>
        </repository>
        <repository>
            <snapshots />
            <id>codecaus</id>
            <name>codehaus</name>
            <url>http://repository.codehaus.org</url>
        </repository>
        <repository>
            <snapshots />
            <id>ibiblio</id>
            <url>http://www.ibiblio.org/maven2/</url>
        </repository>
        <repository>
            <id>jboss</id>
            <url>http://repository.jboss.com/maven2</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>jboss-snapshot</id>
            <url>http://snapshots.jboss.org/maven2</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>java.net.glassfish</id>
            <name>Repository hosting the jee6 artifacts</name>
            <url>http://download.java.net/maven/glassfish</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>jboss-plugins</id>
            <url>http://repository.jboss.com/maven2</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>jboss-snapshot-plugins</id>
            <url>http://snapshots.jboss.org/maven2</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

    <dependencies>
        <dependency>
            <groupId>javax.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.el</groupId>
            <artifactId>el-api</artifactId>
            <version>1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.0.0.GA</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish</groupId>
            <artifactId>bean-validator</artifactId>
            <version>3.0-JBoss-4.0.0.Beta3</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.extras</groupId>
            <artifactId>glassfish-embedded-all</artifactId>
            <version>3.0</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>6.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
        </dependency>


        <dependency>
            <groupId>javax.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>

        <!-- JPA -->

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>3.5.0-CR-2</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-annotations</artifactId>
            <version>3.5.0-CR-2</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-commons-annotations</artifactId>
            <version>3.2.0.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>3.5.0-CR-2</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-c3p0</artifactId>
            <version>3.5.0-CR-2</version>
        </dependency>

        <dependency>
            <groupId>postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>8.4-701.jdbc4</version>
        </dependency>


        <!-- logging -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>0.9.18</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>0.9.18</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.5.11</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.0.0</version>
        </dependency>
    </dependencies>
    <properties>
        <netbeans.hint.deploy.server>gfv3ee6</netbeans.hint.deploy.server>
    </properties>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.6</source>
                        <target>1.6</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>2.0</version>
                </plugin>

            </plugins>
        </pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.0</version>
            </plugin>
        </plugins>
    </build>
</project>

编辑：我也尝试将记录器更改为静态，无需更改。

使用EJB3.1进行logback

4 个答案: