【发布时间】：2011-08-30 15:09:29
【问题描述】：
当尝试从配置文件初始化休眠时，我得到 NullPointerException .. 根本原因显示为
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
我在类路径中有所有与日志记录相关的 jar 和属性文件。
我的休眠初始化代码是：
private static final SessionFactory sessionFactory;
private static final ThreadLocal<Session> hibernateSession=new ThreadLocal<Session>();
static{
try{
sessionFactory=new Configuration().configure("llhs_hibernate.cfg.xml").buildSessionFactory();
System.out.println("done");
}catch (HibernateException he){
he.printStackTrace();
throw new ExceptionInInitializerError(he);
}catch (Exception e){
e.printStackTrace();
throw new ExceptionInInitializerError(e);
}
简单的java类不会抱怨与日志相关的错误，例如下面的java类不会抱怨..它正确初始化并写入日志文件夹
public class MetadataService implements Serializable {
private static final Logger logger = LogManager.getLogger(MetadataService.class);
private static final long serialVersionUID = 1L;
public MetaData getMetaData(){
logger.info("Info");
try {
//some code here
} catch (Exception e1) {
logger.error("Error");
}
return metaData;
}
因为它适用于独立的 Java 类，而不适用于进行休眠初始化的类——我更困惑..任何指针？详细的痕迹
java.lang.ExceptionInInitializerError
at com.llhs.persistence.impl.db.hibernate.utils.HibernateUtils.<clinit>(HibernateUtils.java:17)
at com.llhs.persistence.impl.hibernate.HibernateDbImplTest.addStudentDetails(HibernateDbImplTest.java:61)
at com.llhs.persistence.impl.hibernate.HibernateDbImplTest.testAddFindStudentDetails(HibernateDbImplTest.java:128)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:292)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException(Caused by java.lang.NullPointerException))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:126)
... 26 more
Caused by: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 30 more
Caused by: java.lang.NullPointerException
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:374)
... 31 more
发布跟踪时出现对齐问题，抱歉，无法纠正该问题..
【问题讨论】：
-
异常中的堆栈跟踪不足，请全部提供。无论如何，在这里使用静态单例是非常糟糕的主意，使用 Spring 或类似的进行依赖注入。此外，hibernate 正在抱怨 apache commons，而不是像您的测试用例中那样抱怨 jul。我怀疑其他类中的类加载器和静态初始化块存在一些问题。
-
是的，我完全同意，但这只是一些测试代码.. 使用 n throw 之类的.. 所以忽略了设计方面。顺便说一句，我不认为这是由于静态块，因为我在其他环境中使用过它。是的，这是 apache commons 中的一个问题，所以我也将其标记为日志记录
-
我添加了eclipse作为标签，这个问题在使用eclipse运行测试套件时非常具体。如果使用 ant 脚本，则不会发生这种情况。
标签： eclipse hibernate logging apache-commons-logging