[英]java netbeans The new driver class is `com.mysql.cj.jdbc.Driver'
[英]Configuration error. Class [com.mysql.cj.jdbc.Driver] not found. EclipseLink, MySQL driver
我正在嘗試使用 EclipseLink 學習 JPA。 我正在使用 Mysql 作為我的數據庫。 我已經添加了所有需要的依賴項,下面是我的 pom.xml
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.7.0</version>
<exclusions>
<exclusion>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
<scope>runtime</scope>
</dependency>
</dependencies>
問題是,即使 maven 已經為 mysql jdbc 連接器下載了所有必需的 jars,我仍收到異常描述:配置錯誤。 找不到 Class [com.mysql.cj.jdbc.Driver]。 以下是我使用的版本:1. Mysql JDBC 連接器:8.0.11 2. Eclipselink:2.7.1 3. JPA:2.2.0
附上我的Maven依賴jars的截圖。
我嘗試了 stackoverflow 上其他線程的所有建議,但無法解決問題。
感謝您的幫助,並提前致謝!
下面是我的堅持。xml
<?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="Eclipselink_JPA" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/jpadb"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="root"/>
<property name="eclipselink.logging.level" value="FINE"/>
<property name="eclipselink.ddl-generation" value="create-tables"/>
</properties>
</persistence-unit>
</persistence>
此外,添加錯誤堆棧跟蹤:
[EL Fine]: server: 2018-06-24 17:33:10.619--Thread(Thread[main,5,main])--配置的服務器平台:org.eclipse.persistence.platform.server.NoServerPlatform [EL Info ]: 2018-06-24 17:33:11.065--ServerSession(1101598632)--Thread(Thread[main,5,main])--EclipseLink,版本:Eclipse 持久性服務 - 2.6.5.v20170607-b3d05bd [EL嚴重]: ejb: 2018-06-24 17:33:11.068--ServerSession(1101598632)--Thread(Thread[main,5,main])--Exception [EclipseLink-4003] (Eclipse Persistence Services - 2.6.5 .v20170607-b3d05bd): org.eclipse.persistence.exceptions.DatabaseException 異常描述:配置錯誤。 找不到 Class [com.mysql.cj.jdbc.Driver]。 線程“main”中的異常 javax.persistence.PersistenceException: Exception [EclipseLink-4003] (Eclipse Persistence Services - 2.6.5.v20170607-b3d05bd): org.eclipse.persistence.exceptions.DatabaseException 異常描述:配置錯誤。 找不到 Class [com.mysql.cj.jdbc.Driver]。 at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:818) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:207) at org.eclipse.persistence.internal .jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:307) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl .java:303) at practice.JPA.persistence.App.main(App.java:17) Caused by: Exception [EclipseLink-4003] (Eclipse Persistence Services - 2.6.5.v20170607-b3d05bd): org8878317887831 .exceptions.DatabaseException異常描述:Con 形象錯誤。 找不到 Class [com.mysql.cj.jdbc.Driver]。 at org.eclipse.persistence.exceptions.DatabaseException.configurationErrorClassNotFound(DatabaseException.java:89) at org.eclipse.persistence.sessions.DefaultConnector.loadDriverClass(DefaultConnector.java:267) at org.eclipse.persistence.sessions.DefaultConnector.connect (DefaultConnector.java:85) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:214) at org. eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:776) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa. EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.882132469458 88:734)... 還有 5 個
我的項目使用 MySQL 和 JPA 的 EclipseLink 實現,並且工作正常。 我的pom文件:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.19</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.7.6</version>
</dependency>
我想我來不及了,但可以幫助任何人。 在我的例子中,我使用的是 mysql-connector-java3.1.11 並得到相同的錯誤。 在嘗試了一些其他無效的解決方案后,我檢查了“persistence.xml”的源代碼並更改了以下行: <property name="javax.persistence.cj.jdbc.driver" value="com.mysql.jdbc.Driver"/>
到<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
(從字符串中刪除“cj”)之后,我的程序運行沒有問題。
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