java Hibernate 5.2.10：无法执行解组

Hibernate 5.2.10: Unable to perform unmarshalling

提问by senham

Edit 5: Solved

编辑 5：已解决

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.

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。这是我找到解决方案的链接。

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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).

我使用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 时出现问题（我知道负责 getSessionFactory 的代码不同，所以我对其进行了更改）。

My first function:

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;
}

And my function in 5.2.10 version:

我在 5.2.10 版本中的功能：

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;

}

Exception:

例外：

Exception in thread "main" org.hibernate.internal.util.config.ConfigurationException: Unable to perform unmarshalling at line number 0 and column 0 in RESOURCE hibernate.cfg.xml. Message: null

线程“main” org.hibernate.internal.util.config.ConfigurationException 中的异常：无法在 RESOURCE hibernate.cfg.xml 中的第 0 行和第 0 列执行解组。消息：空

and hibernate.cfg.xml

和 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>

Where is the problem? I've tried everything.

哪里有问题？我什么都试过了。

Edit: pom.xml

编辑：pom.xml

  <?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>

Edit 2

编辑 2

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;
    }

}

Testing class.

测试班。

  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();
    }

}

Edit 3

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

Edit 4

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

回答by Yordan Boev

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...

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

Maybe adding the following dependency would fix your problem:

也许添加以下依赖项可以解决您的问题：

<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>

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

从这里获取的最新版本：https: //mvnrepository.com/artifact/com.sun.xml.bind/jaxb-impl

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:

如果 ClassNotFound 异常仍然存在......我会更仔细地查看 JAXB 休眠正在使用的版本。分析依赖关系的一个非常好的方法是以下两个命令：

mvn clean dependency:analyze

and

和

mvn clean dependency:tree

For Edit4:check following answers:

对于 Edit4：检查以下答案：

ConfigurationException: Could not locate cfg.xml resource [hibernate.cfg.xml] in project root folder

ConfigurationException：无法在项目根文件夹中找到 cfg.xml 资源 [hibernate.cfg.xml]

Location of hibernate.cfg.xml in project?

hibernate.cfg.xml 在项目中的位置？