EclipseLink：如何为 eclipselink 2.7.0 设置 SLF4J 记录器

Question

Bundle org.eclipse.persistence.extension_2.7.0.qualifier.jar（我安装到 osgi 框架）包含类 org.eclipse.persistence.logging.slf4j.SLF4JLogger。在我的持久性文件中，我有

<property name="eclipselink.logging.logger" value="org.eclipse.persistence.logging.slf4j.SLF4JLogger"/>

但我明白了

Exception Description: ClassNotFound: [org.eclipse.persistence.logging.slf4j.SLF4JLogger] specified in [eclipselink.logging.logger] property.
Internal Exception: java.lang.ClassNotFoundException: org.eclipse.persistence.logging.slf4j.SLF4JLogger not found by org.eclipse.persistence.jpa [11]
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:231)
    ... 36 more
Caused by: Exception [EclipseLink-28006] (Eclipse Persistence Services - 2.7.0.qualifier): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: ClassNotFound: [org.eclipse.persistence.logging.slf4j.SLF4JLogger] specified in [eclipselink.logging.logger] property.
Internal Exception: java.lang.ClassNotFoundException: org.eclipse.persistence.logging.slf4j.SLF4JLogger not found by org.eclipse.persistence.jpa [11]
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.classNotFoundForProperty(EntityManagerSetupException.java:135)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.findClassForPropertyInternal(EntityManagerSetupImpl.java:1341)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.findClassForProperty(EntityManagerSetupImpl.java:1327)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateLoggers(EntityManagerSetupImpl.java:1202)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1752)
    ... 34 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.persistence.logging.slf4j.SLF4JLogger not found by org.eclipse.persistence.jpa [11]
    at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1574)
    at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:79)
    at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2018)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getClassForName(PrivilegedAccessHelper.java:165)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.findClass(EntityManagerSetupImpl.java:1319)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.findClassForPropertyInternal(EntityManagerSetupImpl.java:1337)
    ... 37 more

我已经检查了 bundle org.eclipse.persistence.extension_2.7.0.qualifier.jar doesn't export package org.eclipse.persistence.logging.slf4j 所以，谁能解释一下如何让 eclipselink 登录 slf4j？

Answer 1

确保包含“org.eclipse.persistence.extension” jar，它应该可以正常工作。我使用的maven坐标是

  <dependency>
     <groupId>org.eclipse.persistence</groupId>
     <artifactId>org.eclipse.persistence.extension</artifactId>
     <version>2.7.2</version>
     <scope>runtime</scope>
  </dependency>

Answer 2

由于提供包没有导出org.eclipse.persistence.logging.slf4j.SLF4JLogger，因此您必须通过创建一个扩展org.eclipse.persistence.logging.AbstractSessionLog 的记录器类并覆盖/实现一些方法，就像在原始org.eclipse.persistence.logging.slf4j.SLF4JLogger 中所做的那样，在您的代码中对其进行调整

基本上它只是来自 EclipseLink 的原始记录器的副本。

现在在创建 EntityManagerFactory 时传递给 PersistenceProvider 的 JPA 属性映射中添加 EclipseLink 日志记录类别和级别。

Map<String, Object> properties = new HashMap<>();
// Add the necessary logging category and level as per your requirement.
properties.put("eclipselink.logging.level.connection", "FINE");
properties.put("eclipselink.logging.level.jpa", "FINER");
properties.put("eclipselink.logging.level.sql", "FINEST");
// and so on for other categories which can be found in
// org.eclipse.persistence.logging.SessionLog

// Now put your logger class in persistence properties map so that EclipseLink use your logger instance.
properties.put("eclipselink.logging.logger", <your logger>.class.getName());

还要确保将以下具有您选择的级别的记录器添加到您的日志记录后端。

例如，使用 Logback，声明将如下所示。

<logger name="eclipselink.logging" level="DEBUG" additivity="false">
    <appender-ref ref="ROLLING_FILE"/>
</logger>

我正在从一个开源项目中添加一个 GitHub link，该项目已经改编了原始 org.eclipse.persistence.logging.slf4j.SLF4JLogger 的源代码

希望这会有所帮助。