mysql - 错误：HHH000299：无法完成架构更新 java.lang.NullPointerException

Question

我在以下环境中有一个 Web 应用程序。

JPA 2.0
春天 3.2.2
MySQL 5.6.11
休眠 4.2.0 CR1
Apache Tomcat 7.0.35

到目前为止，我在application-context.xml文件中的配置如下。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">


    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/social_networking?zeroDateTimeBehavior=convertToNull" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="WebAppPU"/>
        <property name="dataSource" ref="dataSource" />

        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true"/>
                <property name="generateDdl" value="true"/>
                <property name="databasePlatform" value="org.hibernate.dialect.HSQLDialect"/>
            </bean>
        </property>

        <property name="jpaDialect">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
        </property>
    </bean>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>    
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <bean id="testDAOService" class="admin.dao.TestDAO"/>
</beans>

包含以下persistence.xmlxml。

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
  <persistence-unit name="WebAppPU" transaction-type="RESOURCE_LOCAL">
  <!--<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>-->
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>model.Test</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>

    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/social_networking?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.password" value="root"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.user" value="root"/>
      <!--<property name="hibernate.hbm2ddl.auto" value="create-drop"/>-->
    </properties>
  </persistence-unit>
</persistence>

以下是目前唯一的实体类。我试图用这个成功的实体执行插入操作。

package model;

@Entity
public class Test implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id", nullable = false)
    private Integer id;
    @Column(name = "description", length = 45)
    private String description;
    private static final long serialVersionUID = 1L;

    public Test() {}

    public Test(Integer id) {
        this.id = id;
    }

    // Getters and setter.
}

尽管应用程序运行，但在服务器控制台上可以看到以下异常。

ERROR: HHH000299: Could not complete schema update
java.lang.NullPointerException
    at org.hibernate.tool.hbm2ddl.DatabaseMetadata.initSequences(DatabaseMetadata.java:156)
    at org.hibernate.tool.hbm2ddl.DatabaseMetadata.<init>(DatabaseMetadata.java:70)
    at org.hibernate.tool.hbm2ddl.DatabaseMetadata.<init>(DatabaseMetadata.java:63)
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:196)
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:178)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:505)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)
    at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:94)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:905)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:890)
    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:74)
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:288)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1485)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1117)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:922)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:389)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:294)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3926)
    at org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:954)
    at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:364)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)

尝试在persistence.xml文件中使用以下属性，但没有帮助。

<property name="hibernate.hbm2ddl.auto" value="update"/>

可能是什么原因？

score 10 · Accepted Answer

看起来您错误地混合了 Hibernate 方言和数据库。在您的原始问题中，您有一个 MySQL 数据库和一种方言org.hibernate.dialect.HSQLDialect（参见下面的第一个代码块）。

在您的解决方案中，您拥有 MySQL 数据库和正确的方言org.hibernate.dialect.MySQL5Dialect（请参阅下面的第二个代码块）。

如果您databasePlatform将原始版本中的更改为 MySQL 方言，它也可以正常工作。

原来的：

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
  ...
  <property name="jpaVendorAdapter">
    <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
      ...
      <property name="databasePlatform" value="org.hibernate.dialect.HSQLDialect"/>
    </bean>
  </property>
  ...
</bean>

在职的：

<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
  <persistence-unit name="WebAppPU" transaction-type="RESOURCE_LOCAL">
    ...
    <properties>
      ...
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>      
      ...
    </properties>
  </persistence-unit>
</persistence>

score 2 · Accepted Answer

就我而言，原因是磁盘空间不足。

我在 OpenShift 上有一个实例，首先 JDBC 开始抛出一些异常，因为 MySQL 已关闭，用垃圾填充日志，最后填满了磁盘。

score 0 · Accepted Answer

当我坚持使用 JNDI 查找时，问题就消失了。因此，在context.xml文件中，我定义了一个资源，例如，

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/WebApp">
    <Resource name="jdbc/social_networking" 
              auth="Container"
              type="javax.sql.DataSource"
              maxActive="100"
              maxIdle="30"
              maxWait="10000"
              username="root"
              password="root"
              driverClassName="com.mysql.jdbc.Driver"
              url="jdbc:mysql://localhost:3306/social_networking"/>
</Context>

资源引用需要在web.xml文件中定义，例如，

<resource-ref>
    <res-ref-name>jdbc/social_networking</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

该数据源在persistence.xml文件中引用如下。

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
  <persistence-unit name="WebAppPU" transaction-type="RESOURCE_LOCAL">
  <!--<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>-->
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <non-jta-data-source>java:comp/env/jdbc/social_networking</non-jta-data-source>
    <class>model.Test</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>

    <properties>
      <property name="hibernate.connection.datasource" value="java:comp/env/jdbc/social_networking"/>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>      
      <property name="hibernate.show_sql" value="true" />
      <property name="hibernate.format_sql" value="true" />
      <property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy"/>
    </properties>
  </persistence-unit>
</persistence>

最后application-context.xml文件修改如下。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
       http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <context:component-scan base-package="admin.mangedbean converter" use-default-filters="false">
        <context:include-filter expression="org.springframework.stereotype.Controller" type="annotation"/>
        <context:include-filter expression="org.springframework.web.bind.annotation.ControllerAdvice" type="annotation"/>  
    </context:component-scan>
    <mvc:annotation-driven/>
    <context:annotation-config/>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>            
    <bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="entityManagerFactory" >
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.enable_lazy_load_no_trans">false</prop>
                <!-- I use fetch joins or queries/subqueries with a desired/required list of columns only for lazily loaded collections, when they are required to be fetched from outside of an active transaction boundary.
                     Therefore it is set to false. -->
            </props>
        </property>

        <property name="jpaPropertyMap">
            <map>
              <entry key="eclipselink.weaving" value="false"/>
            </map>
        </property>

        <property name="loadTimeWeaver">
            <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
        </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="java:comp/env/jdbc/social_networking"/>
    </bean>

    <!--Bean registration-->
    <bean id="testService" class="admin.dao.TestDAO"/>
</beans>

score -1 · Accepted Answer

请检查实体表是否存在。

如果它存在，那么您会收到以下属性的错误。

<property name="hibernate.hbm2ddl.auto" value="update"/>

将其更改为

<property name="hibernate.hbm2ddl.auto" value="create"/>

这将创建新的实体表。

mysql - 错误：HHH000299：无法完成架构更新 java.lang.NullPointerException

4 回答 4

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