真正解决方案:java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
真正解决方案:java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
1. 故障描述
今天在使用JDK 9.0 环境下使用Hibernate 时候出现了这个错误,错误日志如下:
2. 故障原因分析
JAXB API是java EE 的API,因此在java SE 9.0 中不再包含这个 Jar 包。
java 9 中引入了模块的概念,默认情况下,Java SE中将不再包含java EE 的Jar包
而在 java 6/7 / 8 时关于这个API 都是捆绑在一起的
3.解决方案
3.1 解决方案一
降低JDK 9 版本到 JDK 6/7/8
3.2 解决方案二(亲测可行)
手动加入这些依赖Jar包
要解决这个问题,我导入了下面这四个Jar包修复成功。
下载上面这些文件和复制他们到libs文件夹下,
添加他们导入到Build Path中
重新运行即可
3.3 解决方案三
Maven项目可添加如下依赖:
<!-- Java 6 = JAX-B Version 2.0 --> <!-- Java 7 = JAX-B Version 2.2.3 --> <!-- Java 8 = JAX-B Version 2.2.8 --> <dependencies> <dependency> <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-impl</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-core</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> </dependency> </dependencies>
Gradle 项目引入依赖:
dependencies { // JAX-B dependencies for JDK 9+ implementation "javax.xml.bind:jaxb-api:2.3.0" implementation "com.sun.xml.bind:jaxb-core:2.3.0" implementation "com.sun.xml.bind:jaxb-impl:2.3.0" implementation "javax.activation:activation:1.1.1" }
Tips:
建议使用中心仓库,否则可能某些jar找不到:
HTTP: http://repo1.maven.org/maven2
HTTPS:https://repo1.maven.org/maven2
测试代码:
public class DatabaseConnectionTools { private static final SessionFactory ourSessionFactory; static { try { Configuration configuration = new Configuration(); configuration.configure(); ourSessionFactory = configuration.buildSessionFactory(); } catch (Throwable ex) { throw new ExceptionInInitializerError(ex); } } public static Session getSession() throws HibernateException { return ourSessionFactory.openSession(); } public static void main(final String[] args) throws Exception { final Session session = getSession(); try { System.out.println("querying all the managed entities..."); final Metamodel metamodel = session.getSessionFactory().getMetamodel(); for (EntityType<?> entityType : metamodel.getEntities()) { final String entityName = entityType.getName(); final Query query = session.createQuery("from " + entityName); System.out.println("executing: " + query.getQueryString()); for (Object o : query.list()) { System.out.println(" " + o); } } } finally { session.close(); } } }
Tips: 如果做完上述操作,仍然报错,请检查out 文件夹下的lib 文件夹中是否包含刚添加的几个Jar包,如果没有,那么请继续下面的操作:
选中project,然后右键选择open module settings
然后检查Problem选项卡,检查右侧是否有‘Fixed’ 字样,如果有,请点击’Fixed’