JPA的多模块Maven项目依赖性问题

Question

I'm getting an error with a multi-module maven project. I attempt to run "maven install" via eclipse run as option.

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building mysite-entities 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ mysite-entities ---
[debug] execute contextualize
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/thomas/spring/mysite-parent/mysite-entities/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ mysite-entities ---
[INFO] Compiling 11 source files to /home/thomas/spring/mysite-parent/mysite-entities/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/thomas/spring/mysite-parent/mysite-entities/src/main/java/com/mysite/entities/Mcc.java:[5,24] package javax.persistence does not exist
[ERROR] /home/thomas/spring/mysite-parent/mysite-entities/src/main/java/com/mysite/entities/Mcc.java:[6,24] package javax.persistence does not exist
[ERROR] /home/thomas/spring/mysite-parent/mysite-entities/src/main/java/com/mysite/entities/Mcc.java:[8,1] cannot find symbol
symbol: class Entity
@Entity

Mcc.java:

package com.mysite.entities;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Mcc implements Serializable
{
    /**
     * 
     */
    private static final long serialVersionUID = 4146710247449711520L;

    @Id
    private Long id;

    private String name;

    public Long getId()
    {
        return id;
    }

    public void setId(Long id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }
}

My pom.xml includes:

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
</dependency>

I've checked the maven dependencies that are pulled in and they include hibernate-jpa-2.0-api-1.0.1.Final.jar which in turns includes all the necessary classes.

Why am I getting this maven error?

Answer 1

There actually is a dependency for javax.persistence . This goes along with the JPA implementation (Hibernate in your case).

Add this to your pom.xml

<dependency>
   <groupId>javax.persistence</groupId>
   <artifactId>persistence-api</artifactId>
   <version>1.0</version>
   <optional>true</optional>
</dependency>

Answer 2

Found this post somewhere and found this get rid of the warning messages.

Copy slf4j-api-VERSION.jar and logback-classic-VERSION.jar to %JAVA_HOME%\\jre\\lib\\ext

• slf4j-api-VERSION.jar is located in %M2_REPOSITORY%\\org\\slf4j\\slf4j-api\\VERSION\\

• logback-classic-VERSION.jar is located in %M2_REPOSITORY%\\ch\\qos\\logback\\logback-classic\\VERSION\\

• If not using logback-classic, then At least slf4j-log4j12 , slf4j-simple , slf4j-jdk14 or logback-classic binding must be in rhw classpath.