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我正在尝试通过 JBoss 服务器上的 JPA 连接到 MySQL 数据库。

部署项目时出现以下异常。

13:04:41,035 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC00001: Failed to start service jboss.persistenceunit."dryrun.war#dbname": org.jboss.msc.service.StartException in service jboss.persistenceunit."dryrun.war#dbname": Failed to start service
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1767) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_15]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_15]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_15]

Caused by: javax.persistence.PersistenceException: [PersistenceUnit: dbname] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:889)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:73)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.createContainerEntityManagerFactory(PersistenceUnitServiceImpl.java:162)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.start(PersistenceUnitServiceImpl.java:85)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
... 3 more

Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.service.jdbc.connections.spi.ConnectionProvider]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:187)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:234)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:91)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2270)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2266)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1735)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:84)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904)
... 9 more

Caused by: org.hibernate.HibernateException: Could not instantiate connection provider [org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider]
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:190)
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.initiateService(ConnectionProviderInitiator.java:112)
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.initiateService(ConnectionProviderInitiator.java:54)
at org.hibernate.service.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:69)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:177)
... 22 more

Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider]
at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:141)
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:187)
... 26 more

Caused by: java.lang.ClassNotFoundException: Could not load requested class : org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider
at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$1.findClass(ClassLoaderServiceImpl.java:99)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423) [rt.jar:1.7.0_15]
at java.lang.ClassLoader.loadClass(ClassLoader.java:356) [rt.jar:1.7.0_15]
at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:138)
... 27 more

我的 persistence.xml 文件是：

<?xml version="1.0" encoding="UTF-8"?>


<persistence-unit name="dbname" transaction-type="RESOURCE_LOCAL">
    <properties>
        <property name="hibernate.show_sql" value="false" />
        <property name="hibernate.format_sql" value="false" />
        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
        <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/dbname" />
        <property name="hibernate.connection.username" value="root" />
        <property name="hibernate.connection.password" value="" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        <property name="hibernate.connection.provider_class" value="org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider" />
        <property name="hibernate.c3p0.minPoolSize" value="0" />
        <property name="hibernate.c3p0.maxPoolSize" value="25" />
        <property name="hibernate.c3p0.maxConnectionAge" value="14400" />
        <property name="hibernate.c3p0.maxIdleTime" value="100" />
    </properties>
</persistence-unit>

我的 pom.xml 文件是：

<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>projectname</groupId>
<artifactId>projectname</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
    <version.jboss.bom>1.0.4.Final</version.jboss.bom>
</properties>
<build><!-- Maven will append the version to the finalName (which is the 
        name given to the generated war, and hence the context root) -->
    <finalName>${project.artifactId}</finalName>
    <plugins><!-- Compiler plugin enforces Java 1.6 compatibility and activates 
            annotation processors -->
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.2</version>
            <configuration><!-- Java EE 6 doesn't require web.xml, Maven needs to 
                    catch up! -->
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin><!-- The JBoss AS plugin deploys your war to a local JBoss AS 
            container --><!-- To use, run: mvn package jboss-as:deploy -->
        <plugin>
            <groupId>org.jboss.as.plugins</groupId>
            <artifactId>jboss-as-maven-plugin</artifactId>
            <version>7.1.1.Final</version>
        </plugin>
    </plugins>
</build>
<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.6.3.Final</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.15</version>
    </dependency>
    <dependency>
        <groupId>org.jboss.as</groupId>
        <artifactId>jboss-as-jpa-hibernate3</artifactId>
        <version>7.1.3.Final</version>
    </dependency>
    <dependency>
        <groupId>jexcelapi</groupId>
        <artifactId>jxl</artifactId>
        <version>2.6</version>
    </dependency>
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>2.0-rc1</version>
    </dependency>
    <dependency>
        <groupId>javax.enterprise</groupId>
        <artifactId>cdi-api</artifactId>
        <version>1.1-20130222</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.6.0</version>
    </dependency>
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.2-pre8</version>
    </dependency>
</dependencies>

我已经从 Hibernate 和我能找到的其他依赖项中尝试了许多不同的与 c3p0 相关的依赖项，但似乎没有任何东西可以使项目正常工作。有人可以指出我正确的方向。谢谢你。

4

2 回答 2

3

您缺少的特定依赖项是

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-c3p0</artifactId>
    <version>3.6.3.Final</version>
</dependency>

您缺少的类曾经在 hibernate-core 中，但它可能在 3.3 版左右移到了这里

http://mvnrepository.com/artifact/org.hibernate/hibernate-c3p0

http://gazelle.ihe.net/content/how-use-c3p0-jdbc-connection-pool-your-maven-project

于 2013-07-02T23:12:17.040 回答
1

好吧，我通过将我可以在 Maven 上找到的所有 c3p0 依赖项同时捆绑到项目中来解决了这个问题。我不确定哪个依赖项解决了这个问题，但其中一个解决了。因此，这个问题似乎是由于缺少 jar，这是我从 ClassNotFoundException 中怀疑的。

于 2013-03-02T12:13:39.613 回答