Spring 数据 java 配置未找到 org.postgresql.Driver
Spring Data java configuration doesn't find the org.postgresql.Driver
我有一个基于 Spring 框架的项目,它仅基于 Java 配置进行初始化。
使用的技术:
- Java 8
- Spring 框架 4.2.1.RELEASE
- 休眠 ORM 5.0.4.Final
- Spring 工具套件 IDE 3.6.2
- 行家 3
- Tomcat 7
pom.xml
....
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons-core</artifactId>
<version>1.4.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-core</artifactId>
<version>2.4.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.9.1.RELEASE</version>
</dependency>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<!-- Annotations -->
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-jaxb-annotations</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.6.3</version>
</dependency>
<!-- Postgres -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4-1205-jdbc42</version>
</dependency>
<!-- MySQL Connector -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.0.4.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.3.1.Final</version>
</dependency>
<!-- Transaction -->
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<!-- @Inject -->
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
</dependencies>
.....
数据库配置文件
我创建了以下配置 class。
而 SystemSettings 保存数据库的用户名、密码和 url
@Service
@Configuration
public class SystemSettings implements Settings {
public static final String DS_URL = "datasource.app.url";
public static final String DS_USERNAME = "datasource.app.username";
public static final String DS_PASSWORD = "datasource.app.password";
@Autowired
private Environment env;
@Override
public String get(String key) {
return env.getProperty(key);
}
}
这些值是从 application.properties 文件中提取的,因为它在 PersistenceContext class 中表示。
PersistenceContext
@Component
@EnableTransactionManagement
@PropertySource("classpath:application.properties")
public class PersistenceContext {
@Autowired
private Environment env;
@Bean
@Primary
public DataSource dataSource() throws ClassNotFoundException {
org.apache.tomcat.jdbc.pool.DataSource ds = new org.apache.tomcat.jdbc.pool.DataSource();
String url = env.getProperty(SystemSettings.DS_URL);
String user = env.getProperty(SystemSettings.DS_USERNAME);
String pass = env.getProperty(SystemSettings.DS_PASSWORD);
ds.setDriverClassName("org.postgresql.Driver");
ds.setUrl(url);
ds.setUsername(user);
ds.setPassword(pass);
return ds;
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource);
entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
entityManagerFactoryBean.setPackagesToScan("com.project.app.services.entities");
Properties jpaProperties = new Properties();
// Configures the used database dialect. This allows Hibernate to create SQL
// that is optimized for the used database.
jpaProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
// Specifies the action that is invoked to the database when the Hibernate
// SessionFactory is created or closed.
jpaProperties.put("hibernate.hbm2ddl.auto",
env.getRequiredProperty("hibernate.hbm2ddl.auto"));
// If the value of this property is true, Hibernate writes all SQL
// statements to the console.
jpaProperties.put("hibernate.show_sql", env.getRequiredProperty("hibernate.show_sql"));
// If the value of this property is true, Hibernate will format the SQL
// that is written to the console.
jpaProperties.put("hibernate.format_sql", env.getRequiredProperty("hibernate.format_sql"));
entityManagerFactoryBean.setJpaProperties(jpaProperties);
return entityManagerFactoryBean;
}
@Bean
JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory);
return transactionManager;
}
}
还有 属性 文件
hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
hibernate.hbm2ddl.auto=create-drop hibernate.show_sql=false
hibernate.format_sql=true
datasource.app.type=POSTGRESQL
datasource.app.driverClassName=org.postgresql.Driver
datasource.app.url=jdbc:postgresql://localhost:5432/app
datasource.app.username=user
datasource.app.password=pass
不幸的是我现在收到这个错误
SEVERE: Unable to create initial connections of pool.
java.sql.SQLException: org.postgresql.Driver at
...... Caused by: java.lang.ClassNotFoundException:
org.postgresql.Driver at......
我不知道为什么它给我这个异常。 Maven 依赖项在那里,驱动程序也在 classpath 中。 .有什么帮助吗?
这是我的项目结构。您可以看到在构建路径中添加的库。正如评论中所建议的那样,问题可能是 postgres jar 不在 tomcat 库中。我如何在那里添加它?
我怀疑您有继承类加载器问题,其中 JDBC 驱动程序对您的应用程序可见,但对 Tomcat 的连接池不可见。
参见:
- Why must the JDBC driver be put in TOMCAT_HOME/lib folder?
- https://www.mulesoft.com/tcat/tomcat-jdbc
如果您需要 Postgres JDBC jar 中的任何 class,请将您的依赖项修改为已提供。如果不是就删除它。
<!-- Postgres -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4-1205-jdbc42</version>
<scope>provided</scope>
</dependency>
然后将Postgres JDBC jar添加到tomcat
的lib路径
{tomcat7_home_path}/lib
我有一个基于 Spring 框架的项目,它仅基于 Java 配置进行初始化。
使用的技术:
- Java 8
- Spring 框架 4.2.1.RELEASE
- 休眠 ORM 5.0.4.Final
- Spring 工具套件 IDE 3.6.2
- 行家 3
- Tomcat 7
pom.xml ....
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework-version}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework-version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons-core</artifactId>
<version>1.4.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-core</artifactId>
<version>2.4.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.9.1.RELEASE</version>
</dependency>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<!-- Annotations -->
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-jaxb-annotations</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.6.3</version>
</dependency>
<!-- Postgres -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4-1205-jdbc42</version>
</dependency>
<!-- MySQL Connector -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.0.4.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.3.1.Final</version>
</dependency>
<!-- Transaction -->
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<!-- @Inject -->
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
</dependencies>
.....
数据库配置文件
我创建了以下配置 class。
而 SystemSettings 保存数据库的用户名、密码和 url
@Service
@Configuration
public class SystemSettings implements Settings {
public static final String DS_URL = "datasource.app.url";
public static final String DS_USERNAME = "datasource.app.username";
public static final String DS_PASSWORD = "datasource.app.password";
@Autowired
private Environment env;
@Override
public String get(String key) {
return env.getProperty(key);
}
}
这些值是从 application.properties 文件中提取的,因为它在 PersistenceContext class 中表示。
PersistenceContext
@Component
@EnableTransactionManagement
@PropertySource("classpath:application.properties")
public class PersistenceContext {
@Autowired
private Environment env;
@Bean
@Primary
public DataSource dataSource() throws ClassNotFoundException {
org.apache.tomcat.jdbc.pool.DataSource ds = new org.apache.tomcat.jdbc.pool.DataSource();
String url = env.getProperty(SystemSettings.DS_URL);
String user = env.getProperty(SystemSettings.DS_USERNAME);
String pass = env.getProperty(SystemSettings.DS_PASSWORD);
ds.setDriverClassName("org.postgresql.Driver");
ds.setUrl(url);
ds.setUsername(user);
ds.setPassword(pass);
return ds;
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource);
entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
entityManagerFactoryBean.setPackagesToScan("com.project.app.services.entities");
Properties jpaProperties = new Properties();
// Configures the used database dialect. This allows Hibernate to create SQL
// that is optimized for the used database.
jpaProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
// Specifies the action that is invoked to the database when the Hibernate
// SessionFactory is created or closed.
jpaProperties.put("hibernate.hbm2ddl.auto",
env.getRequiredProperty("hibernate.hbm2ddl.auto"));
// If the value of this property is true, Hibernate writes all SQL
// statements to the console.
jpaProperties.put("hibernate.show_sql", env.getRequiredProperty("hibernate.show_sql"));
// If the value of this property is true, Hibernate will format the SQL
// that is written to the console.
jpaProperties.put("hibernate.format_sql", env.getRequiredProperty("hibernate.format_sql"));
entityManagerFactoryBean.setJpaProperties(jpaProperties);
return entityManagerFactoryBean;
}
@Bean
JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory);
return transactionManager;
}
}
还有 属性 文件
hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
hibernate.hbm2ddl.auto=create-drop hibernate.show_sql=false
hibernate.format_sql=truedatasource.app.type=POSTGRESQL
datasource.app.driverClassName=org.postgresql.Driver
datasource.app.url=jdbc:postgresql://localhost:5432/app
datasource.app.username=user
datasource.app.password=pass
不幸的是我现在收到这个错误
SEVERE: Unable to create initial connections of pool. java.sql.SQLException: org.postgresql.Driver at ...... Caused by: java.lang.ClassNotFoundException: org.postgresql.Driver at......
我不知道为什么它给我这个异常。 Maven 依赖项在那里,驱动程序也在 classpath 中。 .有什么帮助吗?
这是我的项目结构。您可以看到在构建路径中添加的库。正如评论中所建议的那样,问题可能是 postgres jar 不在 tomcat 库中。我如何在那里添加它?
我怀疑您有继承类加载器问题,其中 JDBC 驱动程序对您的应用程序可见,但对 Tomcat 的连接池不可见。
参见:
- Why must the JDBC driver be put in TOMCAT_HOME/lib folder?
- https://www.mulesoft.com/tcat/tomcat-jdbc
如果您需要 Postgres JDBC jar 中的任何 class,请将您的依赖项修改为已提供。如果不是就删除它。
<!-- Postgres -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4-1205-jdbc42</version>
<scope>provided</scope>
</dependency>
然后将Postgres JDBC jar添加到tomcat
的lib路径{tomcat7_home_path}/lib