我必须在Ivy.xml中添加 参数，以获取可选配置，这对于检索所有依赖项和项目正常运行是必需的。
dependency org='org.hibernate' name='hibernate-core' rev='3.3.1.GA' conf='runtime->runtime,optional'/>解决方法 很长！;-)
这个问题中有很多复制粘贴的文本，这使它看起来很复杂。老实说，这是很多信息！但是，对于有经验的人来说，其中很多可能是不必要的，并且容易跳过。
从本质上讲，我只是想知道为什么我的基本 Hibernate Core + Hibernate Annotations测试项目无法正常工作。我怀疑缺少依赖项，但是我使用的是ApacheIvy，我认为它将从Maven2存储库ibiblio中自动获得传递性依赖项，但是显然缺少依赖项（请参见帖子中标题下方的有关依赖项）。
我的测试项目我有一个小测试项目：
hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?> <!DOCTYPE hibernate-configuration PUBLIC '-//Hibernate/Hibernate Configuration DTD 3.0//EN' 'http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd'> <hibernate-configuration> <session-factory> <property name='connection.driver_class'>com.mysql.jdbc.Driver</property> <property name='connection.url'>jdbc:mysql://localhost:3306/webcookieschema</property> <property name='connection.username'>webcookieuser</property> <property name='connection.password'>tHePaSsWoRd</property> <property name='dialect'>org.hibernate.dialect.MySQLInnoDBDialect</property> </session-factory> </hibernate-configuration>
Test.java
public class Test { public static void main(String[] args) {UserDAO udao = new HibernateUserDAO();User u = new User();u.setName('somename');udao.store(u); } }
HibernateUserDAO.java
import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.AnnotationConfiguration; public class HibernateUserDAO implementsUserDAO { private SessionFactory sessionFactory; public HibernateUserDAO() {AnnotationConfiguration annotConf = new AnnotationConfiguration();annotConf.addAnnotatedClass(User.class);annotConf.configure();// The line below generates the exception!sessionFactory = annotConf.buildSessionFactory(); } @Override public void store(User user) {Session session = sessionFactory.openSession();Transaction tx = session.getTransaction();try { tx.begin(); session.saveOrUpdate(user); tx.commit();} catch (RuntimeException e) { tx.rollback(); throw e;} finally { session.close();} } }
log4j.properties
log4j.appender.Stdout=org.apache.log4j.ConsoleAppender log4j.appender.Stdout.layout=org.apache.log4j.PatternLayout log4j.appender.Stdout.layout.conversionPattern=%-5p - %-26.26c{1} - %mn log4j.rootLogger=INFO,Stdout log4j.logger.org.apache.wicket=INFO log4j.logger.org.apache.wicket.protocol.http.HttpSessionStore=INFO log4j.logger.org.apache.wicket.version=INFO log4j.logger.org.apache.wicket.RequestCycle=INFO
UserDAO.java
public interface UserDAO { public void store(User user); }
User.java
import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class User { @Id @GeneratedValue @Column(name = 'ID') private Long id; @Column(name = 'NAME') private String name; public User() { } public Long getId() {return id; } public void setId(Long id) {this.id = id; } public String getName() {return name; } public void setName(String name) {this.name = name; } }
在 我得到的例外，当我运行测试项目：
Exception in thread 'main' java.lang.NoClassDefFoundError: javassist/util/proxy/MethodFilterat org.hibernate.bytecode.javassist.BytecodeProviderImpl.getProxyFactoryFactory(BytecodeProviderImpl.java:49)at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactoryInternal(PojoEntityTuplizer.java:203)at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:181)at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:158)at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:76)at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:80)at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:325)at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:457)at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:131)at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:261)at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)at HibernateUserDAO.<init>(HibernateUserDAO.java:15)at Test.main(Test.java:3)Caused by: java.lang.ClassNotFoundException: javassist.util.proxy.MethodFilter at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) ... 15 more如果缺少依赖项
当我收到 ClassCastException （包括在上面）时，我认为检查所有依赖关系是一个好主意。
如果我下载了 Hibernate Core 档案，然后查看档案的/ lib目录，则会得到：
kent@rat:~/dl-web/hibernate-distribution-3.3.1.GA$ tree lib/lib/|-- bytecode| |-- cglib| | `-- hibernate-cglib-repack-2.1_3.jar| `-- javassist| `-- javassist-3.4.GA.jar|-- optional| |-- c3p0| | `-- c3p0-0.9.1.jar| |-- ehcache| | `-- ehcache-1.2.3.jar| |-- jbosscache| | `-- jboss-cache-1.4.1.GA.jar| |-- jbosscache2| | `-- jbosscache-core-2.1.1.GA.jar| |-- oscache| | `-- oscache-2.1.jar| |-- proxool| | `-- proxool-0.8.3.jar| `-- swarmcache| `-- swarmcache-1.0RC2.jar`-- required |-- antlr-2.7.6.jar |-- commons-collections-3.1.jar |-- dom4j-1.6.1.jar |-- javassist-3.4.GA.jar |-- jta-1.1.jar `-- slf4j-api-1.5.2.jar
如果我下载 hibernate注释 并执行相同的操作，则会得到：
kent@rat:~/dl-web/hibernate-annotations-3.4.0.GA$ tree lib/lib/|-- README.txt|-- build| |-- ant-contrib-1.0b2.jar| |-- ant-junit-1.6.5.jar| `-- junit-3.8.1.jar|-- dom4j.jar|-- ejb3-persistence.jar|-- hibernate-commons-annotations.jar|-- hibernate-core.jar|-- slf4j-api.jar`-- test |-- antlr.jar |-- asm-attrs.jar |-- asm.jar |-- commons-collections.jar |-- javassist.jar |-- jta.jar |-- junit.jar |-- log4j.jar `-- slf4j-log4j12.jar
默认情况下， 我认为Ivy在Maven2模式下使用ibiblio服务器检索其依赖项 。我正在使用此 ivy.xml配置我想要的依赖项：
<?xml version='1.0' encoding='UTF-8'?><ivy-module version='2.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='http://ant.apache.org/ivy/schemas/ivy.xsd'> <info organisation='testorganization' module='hibernatetest' status='integration'/> <configurations><conf name='runtime' description='' /> </configurations> <dependencies><dependency org='mysql' name='mysql-connector-java' rev='5.1.6' conf='runtime->default'/><dependency org='org.hibernate' name='hibernate-core' rev='3.3.1.GA' conf='runtime->default'/><dependency org='org.hibernate' name='hibernate-annotations' rev='3.4.0.GA' conf='runtime->default'> <include></include></dependency><dependency org='org.slf4j' name='slf4j-log4j12' rev='1.5.6' conf='runtime->default'/> </dependencies></ivy-module>
我实际得到 的依赖 JAR 是：
kent@rat:~/.ivy2/cache$ ls -R1 * | egrep ’.jar$’antlr-2.7.6.jarcommons-collections-3.1.jardom4j-1.6.1.jarjta-1.1.jarlog4j-1.2.14.jarmysql-connector-java-5.1.6.jarejb3-persistence-1.0.2.GA.jarhibernate-annotations-3.4.0.GA.jarhibernate-commons-annotations-3.1.0.GA.jarhibernate-core-3.3.1.GA.jarslf4j-api-1.5.6.jarslf4j-log4j12-1.5.6.jarxml-apis-1.0.b2.jar
在ibiblio上用于hibernate-core的POM文件中 ，我想知道 以下几 行：
<dependencies> ... ... ... <!-- optional deps for bytecode providers until those are finally properly scoped --> <dependency> <groupId>javassist</groupId> <artifactId>javassist</artifactId> <version>3.4.GA</version> <optional>true</optional> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-cglib-repack</artifactId> <version>2.1_3</version> <optional>true</optional> </dependency> </dependencies>
他们的意思是什么？ 我都需要吗？如果真的总是需要它们，为什么将它们设置为可选？以及我如何获得它们？
