无法执行解组

无法执行解组

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Hibernate 5.2.10:无法执行解组

本文介绍了Hibernate 5.2.10:无法执行解组的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

主要问题是我使用了JDK 9，其中JAXB API不再位于默认类路径上.这是我发现的链接解决方案.

The main problem was that I've used JDK 9, where the JAXB APIs are no longer on on the default class path. Here is link where I've found solution.

我使用了示例教程中的休眠版本4.3.6，并且一切正常，但是当我将版本更新到5.2.10时，我遇到了问题(我知道负责getSessionFactory的代码是不同的，所以我进行了更改).

I used hibernate version 4.3.6 from example tutorial and everything've worked good, but when I update version to 5.2.10 I have problem (I know that code responsible for getSessionFactory is different so I changed it).

我的第一个功能:

private static SessionFactory getSessionFactory(){
    Configuration configuration = new Configuration().configure();
    StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()
            .applySettings(configuration.getProperties());
    SessionFactory sessionFactory = configuration.buildSessionFactory(builder.build());
    return sessionFactory;
}

我的函数在5.2.10版本中:

And my function in 5.2.10 version:

private static SessionFactory getSessionFactory(){

    StandardServiceRegistry registry;
    SessionFactory sessionFactory;
    registry = new StandardServiceRegistryBuilder().configure().build();

    MetadataSources sources = new MetadataSources(registry);

    Metadata metadata = sources.getMetadataBuilder().build();

    sessionFactory = metadata.getSessionFactoryBuilder().build();
    return sessionFactory;

}

例外:

和hibernate.cfg.xml

and hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?>
        <!DOCTYPE hibernate-configuration SYSTEM


"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQL94Dialect</property>
        <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
        <property name="hibernate.connection.url">jdbc:postgresql://127.0.0.1:5432/postgres</property>
        <property name="hibernate.connection.username">postgres</property>
        <property name="hibernate.connection.password">123</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <property name="show_sql">false</property>
        <property name="hibernate.current_session_context_class">thread</property>
        <mapping class="com.example.Item"/>
    </session-factory>
</hibernate-configuration>

问题出在哪里?我已经尝试了一切.

Where is the problem? I've tried everything.

  <?xml version="1.0" encoding="UTF-8"?>
<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>pl.example</groupId>
<artifactId>example</artifactId>
<version>1.0-SNAPSHOT</version>

<build>
    <plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
    </plugin>
    </plugins>
</build>

<dependencies>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>42.1.4</version>
    </dependency>

    <dependency>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
    </dependency>


    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.2.10.Final</version>
    </dependency>
</dependencies>

public class HibernateUtil {
    private static final SessionFactory sessionFactory;
static {
    try {
        StandardServiceRegistry standardRegistry =
                new StandardServiceRegistryBuilder().configure("hibernate.cfg.xml").build();
        Metadata metaData =
                new MetadataSources(standardRegistry).getMetadataBuilder().build();
        sessionFactory = metaData.getSessionFactoryBuilder().build();
    } catch (Throwable th) {

        System.err.println("Enitial SessionFactory creation failed" + th);
        throw new ExceptionInInitializerError(th);

    }
}
public static SessionFactory getSessionFactory() {

    return sessionFactory;

}

} 

@Entity
@Table(name = "employee")
public class Employee implements Serializable{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id")
    private int id;

    @Column(name="emp_name")
    private String empName;

    @Column(name="emp_address")
    private String empAddress;

    @Column(name="emp_mobile_nos")
    private String empMobileNos;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public String getEmpAddress() {
        return empAddress;
    }

    public void setEmpAddress(String empAddress) {
        this.empAddress = empAddress;
    }

    public String getEmpMobileNos() {
        return empMobileNos;
    }

    public void setEmpMobileNos(String empMobileNos) {
        this.empMobileNos = empMobileNos;
    }

}

测试课程.

  public class Test{
    public static void main(String[] args) throws Exception {

        SessionFactory sessFact = HibernateUtil.getSessionFactory();
        Session session = sessFact.getCurrentSession();
        org.hibernate.Transaction tr = session.beginTransaction();
        Employee emp = new Employee();
        emp.setEmpName("Deepak Kumar");
        emp.setEmpMobileNos("000000");
        emp.setEmpAddress("Delhi - India");
        session.save(emp);
        tr.commit();
        System.out.println("Successfully inserted");
        sessFact.close();
    }

}

编辑3 

lis 17, 2017 11:54:50 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.10.Final}
lis 17, 2017 11:54:50 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
lis 17, 2017 11:54:50 PM org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-configuration. Use namespace http://www.hibernate.org/dtd/hibernate-configuration instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
Enitial SessionFactory creation failedorg.hibernate.internal.util.config.ConfigurationException: Unable to perform unmarshalling at line number 0 and column 0 in RESOURCE hibernate.cfg.xml. Message: null
Exception in thread "main" java.lang.ExceptionInInitializerError
    at pl.lostandfound.HibernateUtil.<clinit>(HibernateUtil.java:31)
    at pl.lostandfound.Test.main(Test.java:13)
Caused by: org.hibernate.internal.util.config.ConfigurationException: Unable to perform unmarshalling at line number 0 and column 0 in RESOURCE hibernate.cfg.xml. Message: null
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:133)
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:65)
    at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:57)
    at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:163)
    at pl.lostandfound.HibernateUtil.<clinit>(HibernateUtil.java:24)
    ... 1 more
Caused by: javax.xml.bind.JAXBException
 - with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:241)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:477)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:656)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:599)
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:122)
    ... 5 more
Caused by: java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
    at javax.xml.bind.ContextFinder.safeLoadClass(ContextFinder.java:594)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:239)
    ... 9 more

编辑4 

    log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Enitial SessionFactory creation failedorg.hibernate.internal.util.config.ConfigurationException: Could not locate cfg.xml resource [hibernate.cfg.xml]
Exception in thread "main" java.lang.ExceptionInInitializerError

推荐答案

我当然会首先修复ClassNotFound异常(java.lang.ClassNotFoundException:com.sun.xml.internal.bind.v2.ContextFactory).这表明不存在需要加载的类...

I would certainly first fix the ClassNotFound Exception (java.lang.ClassNotFoundException:com.sun.xml.internal.bind.v2.ContextFactory). This indicated that a class that needed to be loaded is not present...

也许添加以下依赖项可以解决您的问题:

Maybe adding the following dependency would fix your problem:

<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>

从此处获取的最新版本: https://mvnrepository. com/artifact/com.sun.xml.bind/jaxb-impl

Most recent version taken from here: https://mvnrepository.com/artifact/com.sun.xml.bind/jaxb-impl

如果ClassNotFound异常仍然存在...我将更仔细地查看正在使用的JAXB hibernate版本.以下两个命令是一种很好的分析依赖关系的方法:

If the ClassNotFound exception is still there...I would look more closely what version of JAXB hibernate is using. A very nice way to analyze your dependencies are the following two commands:

mvn clean dependency:analyze

和

mvn clean dependency:tree

对于Edit4:，请检查以下答案:

ConfigurationException:无法找到cfg.项目根文件夹中的xml资源[hibernate.cfg.xml]

hibernate.cfg.xml在项目中的位置?

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07-30 12:12
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