在简单jpa项目中映射类

Question

为了配置一个简单的JPA项目，我使用了Wildfly 8，数据源是在单机版中配置的。xml。

            <datasource jta="true" jndi-name="java:jboss/datasources/postgresql" pool-name="postgreSql" enabled="true" use-ccm="true">
                <connection-url>jdbc:postgresql://localhost:5432/sell</connection-url>
                <driver-class>org.postgresql.Driver</driver-class>
                <driver>postgres</driver>
                <security>
                    <user-name>postgres</user-name>
                    <password>sell</password>
                </security>
            </datasource>

在Web项目中，我配置了持久性。像这样的xml文件

http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"

<persistence-unit name="sellAppPersistenceUnit"
    transaction-type="RESOURCE_LOCAL">              
    <jta-data-source>java:jboss/datasources/postgresql</jta-data-source>
    <class>br.com.sell.app.orm.Usuario</class>
</persistence-unit>

但是，当我添加br时。通用域名格式。卖应用程序。奥姆。通常，我在项目启动时出错，该错误表示存在hibernate问题org/hibernate/proxy/HibernateProxy，但我不使用hibernate。

13:17:50,738 ERROR [org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer] (ServerService Thread Pool -- 58) HHH000142: Javassist Enhancement failed: br.com.sell.app.orm.Usuario: java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/hibernate/proxy/HibernateProxy
    at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:515)
    at javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:492)
    at javassist.util.proxy.ProxyFactory.createClass1(ProxyFactory.java:428)
    at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:400)
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:162)
    at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:67)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:224)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:212)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:80)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:135)
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:188)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:403)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:520)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:148)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

为什么我可以解决这个问题？

pom.xml文件：

http://maven.apache.org/xsd/maven-4.0.0.xsd"

<modules>
    <module>sellAppEndpoint</module>
    <module>sellAppWeb</module>
    <module>sellAppCors</module>
    <module>sellAppDto</module>
    <module>sellAppOrm</module>
    <module>sellAppJpa</module>
</modules>

<dependencies>
    <!-- para importar pacotes javax.* para o REST -->
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>7.0</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.3.0.SP1</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.0.0.Final</version>
    </dependency>

</dependencies>

Answer 1

您的问题似乎是由于声明了不一致的依赖关系造成的——版本5.0.0中的hibernate entitymanager需要hibernate core 5.0.0，但在版本3.3.0中强制使用hibernate core。SP1。课程org。冬眠代理HibernateProxy在3.3.0版中不存在。SP1。当hibernate entitymanager声明对hibernate core的可传递依赖时，您只需删除对hibernate core的依赖即可。

此外，Wildfly 8已经包含hibernate（4.3版），因为它必须根据规范提供JavaEE功能。您可以在Wildfly上使用hibernate，这更标准，除非您不需要hibernate 5.0的特殊功能。在这种情况下，还可以从pom.xml中删除hibernate-entityManager依赖项，您的代码应该仍然可以工作。