Question

我正在尝试使用Spring和JPA + Hibernate建立一个带有MySQL数据库的项目，但每当我启动我的服务器（VMware vFabric tc Server，附带STS）时，我都会遇到以下错误：

ERROR: HHH000299: Could not complete schema update
java.lang.NullPointerException
    at org.hibernate.tool.hbm2ddl.DatabaseMetadata.initSequences(DatabaseMetadata.java:182)

我使用以下配置：

的applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.1.xsd">

    <!-- Database Configuration -->
    <import resource="classes/config/spring/beans/DataSource.xml"/>
    <import resource="classes/config/spring/beans/HibernateSessionFactory.xml"/>

    <!-- Security Configuration -->
    <import resource="springSecurityContext.xml" />

    <context:component-scan base-package="eu.shishigami" />

    <context:annotation-config />

</beans>

DataSource.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <bean
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location">
            <value>WEB-INF/classes/config/database/db.properties</value>
        </property>
    </bean>

    <bean id="dataSourceTemplate"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource"
        destroy-method="close">
        <property name="dataSource" ref="dataSourceTemplate" />
    </bean>

    <bean id="jpaVendorAdapter"
        class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="databasePlatform" value="org.hibernate.dialect.Oracle10gDialect" />
        <property name="showSql" value="true" />
        <property name="generateDdl" value="true" />
    </bean>

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

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

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

</beans>

db.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mydb
jdbc.username=root
jdbc.password=password

HibernateSessionFactory.xml

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

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

        <property name="dataSource">
            <ref bean="dataSource" />
        </property>

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
            </props>
        </property>

    </bean>

</beans>

的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
    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_1_0.xsd">

    <persistence-unit name="hibernate-unit" transaction-type="RESOURCE_LOCAL">
        <properties>
            <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>

“mydb”存在且MySQL服务器已启动。

我在这里发现了一个非常类似的问题：ERROR: HHH000299: Could not complete schema update java.lang.NullPointerException但是我无法得到这个答案：

我替换了DataSource.xml中的dataSource：

<bean id="dataSourceTemplate"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${jdbc.driverClassName}" />
    <property name="url" value="${jdbc.url}" />
    <property name="username" value="${jdbc.username}" />
    <property name="password" value="${jdbc.password}" />
</bean>

<bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource"
    destroy-method="close">
    <property name="dataSource" ref="dataSourceTemplate" />
</bean>

与

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

并将其添加到我的web.xml：

<resource-ref>
    <description>MySQL Development DataSource</description>
    <res-ref-name>mydb</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

然后我将STS中的服务器位置更改为“使用工作空间元数据（不修改服务器安装”）并修改了vfabric-tc-server-developer-2.9.3.RELEASE \ base中的context.xml和server.xml -instance \ conf：

context.xml中

<?xml version="1.0" encoding="UTF-8"?>
<Context>
    <WatchedResource>WEB-INF/web.xml</WatchedResource>

    <ResourceLink name="mydb" 
        type="javax.sql.DataSource" 
        global="mydb" />
</Context>

server.xml中

<?xml version="1.0" encoding="UTF-8"?>
<Server port="${base.shutdown.port}" shutdown="SHUTDOWN">

    ...

    <GlobalNamingResources>
        <Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>

        <Resource type="javax.sql.DataSource" name="mydb"
            driverClassName="com.mysql.jdbc.Driver" jdbcUrl="jdbc:mysql://localhost:3306/mydb"
            factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" username="root"
            password="password" idleMaxAge="240" idleConnectionTestPeriod="60"
            partitionCount="3" acquireIncrement="5" maxConnectionsPerPartition="2"
            minConnectionsPerPartition="1" statementsCacheSize="50"
            releaseHelperThreads="5" />
    </GlobalNamingResources>

    ...

</Server>

我还将mysql-connector-java-5.1.27.jar复制到以下位置（我不确定应该将它复制到哪一个）：

vfabric-tc-server-developer-2.9.3.RELEASE\base-instance\lib
vfabric-tc-server-developer-2.9.3.RELEASE\tomcat-6.0.37.A.RELEASE\lib
vfabric-tc-server-developer-2.9.3.RELEASE\tomcat-7.0.42.A.RELEASE\lib

我的pom.xml中也有连接器（如果我遗漏了某些内容，这里是我的依赖项的完整列表？）

<dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-oxm</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-web</artifactId>
      <version>3.1.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
      <version>3.1.4.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>3.2.4.RELEASE</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.16</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.5</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.5</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>javax.inject</groupId>
      <artifactId>javax.inject</artifactId>
      <version>1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.sun.faces</groupId>
      <artifactId>jsf-api</artifactId>
      <version>2.1.13</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.sun.faces</groupId>
      <artifactId>jsf-impl</artifactId>
      <version>2.1.13</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.glassfish.web</groupId>
      <artifactId>el-impl</artifactId>
      <version>2.2</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.sun.el</groupId>
      <artifactId>el-ri</artifactId>
      <version>1.0</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.27</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.primefaces</groupId>
      <artifactId>primefaces</artifactId>
      <version>4.0</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>joda-time</groupId>
      <artifactId>joda-time</artifactId>
      <version>2.3</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.12.2</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

对于hibernate，我下载了它并将'required'库和entitymanager库复制到上面的lib文件夹中：

antlr-2.7.7.jar
dom4j-1.6.1.jar
hibernate-commons-annotations-4.0.2.Final.jar
hibernate-core-4.2.7.Final.jar
hibernate-entitymanager-4.2.7.Final.jar
hibernate-jpa-2.0-api-1.0.1.Final.jar
javassist-3.18.1-GA.jar
jboss-logging-3.1.0.GA.jar
jboss-transaction-api_1.1_spec-1.0.1.Final.jar

按照另一个线程中的建议修改配置后，启动服务器时出现以下异常：

WARNING: Unexpected exception resolving reference
java.sql.SQLException
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254)

...

Caused by: java.lang.NullPointerException
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:266)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246)

感谢您的帮助，如果我忘了，请告诉我。

Answer 1

很难说出问题是什么，但我想尝试的是让hibernate创建一个数据库创建SCRIPT而不是执行它。然后我会看一下这个脚本（或者手工执行它）来获得一些提示哪些映射/表/序列是问题。

要创建此SCRIPT，您需要一些代码行，您可以在Bozho's tech blog: How To Generate A Schema Creation Script With Hibernate 4, JPA And Maven

中找到一行代码

（我有自己的脚本创建程序（它的核心就像Bozho的一样）但它有许多特殊的附加功能。但如果你不能让Bozho的脚本运行，那么留言并且我将简化我的程序并张贴）

Spring JPA + MySQL - Hibernate无法完成架构更新

1 个答案: