我没有太多使用 Maven,但我知道它首先检查本地存储库以获取所需的 jar 文件,如果在那里找不到,它会从提到的存储库下载它。在我的程序中,jar 文件位于本地存储库中的所需位置。pom.xml 文件也运行良好,但程序仍然无法在任何文件中找到导入。
程序中的测试类:
import javax.persistence.Cacheable;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.Query;
public class TestAnnotation {
public static void main(String args[]){
EntityManagerFactory factory=Persistence.createEntityManagerFactory("annotation");
EntityManager manager=factory.createEntityManager();
EntityTransaction transaction=manager.getTransaction();
transaction.begin();
manager.persist(new Message("My Entity Test One More Example New"));
transaction.commit();
System.out.println("First time calling Message Object");
getMessage(manager,23);
System.out.println("Second time calling Message Object");
getMessage(manager,23);
factory.close();
}
public static void getMessage(EntityManager manager,long id){
EntityTransaction transaction1=manager.getTransaction();
transaction1.begin();
Query q=manager.createQuery("from Message m where m.id="+id);
Message m=(Message)q.getSingleResult();
System.out.println(m.getMessage_text());
transaction1.commit();
}
}
程序中的简单POJO:
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
@Entity
@Table(name="MESSAGES")
@Cache(region = "messages", usage = CacheConcurrencyStrategy.READ_WRITE)
public class Message {
Message(){
}
Message(String message){
message_text=message;
}
@Id @GeneratedValue
@Column(name="MESSAGE_ID")
public Long id;
@Column(name="MESSAGE_TEXT")
public String message_text;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getMessage_text() {
return message_text;
}
public void setMessage_text(String message_text) {
this.message_text = message_text;
}
}
最后是有问题的 pom.xml 文件:
<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>HibernateWithAnnotation</groupId>
<artifactId>HibernateWithAnnotation</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>HibernateWithAnnotation</name>
<repositories>
<repository>
<id>codelds</id>
<url>https://code.lds.org/nexus/content/groups/main-repo</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.5.1-Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>3.2.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>3.5.1-Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>3.5.1-Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.1.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency>
<!-- logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.6.1</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.1</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache-core</artifactId>
<version>2.4.5</version>
</dependency>
</dependencies>
</project>
pom.xml 不包含任何错误。它运行良好的目标 - clean package
。但是我的 java 文件中使用的导入仍然没有解决。我一定在某个地方发生了一些愚蠢的事情。请向我指出。