Maven权威指南 第七章数据库生成不了的解决方法

　　初学Maven,必然是看\<\>,这书很全面也有中文版本,sonatype官网,和GitHub上面都有,下载也很方便( 我是GitHub上抓的 ),不过我看到第七章7.7节,实际遇到了些问题。

书中7.7节原文写到:

7.7. 运行这个Web应用
为了运行这个web应用，你首先需要使用Hibernate3插件构造数据库。为此，在项目simple-webapp目录下运行如下命令：

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>$ mvn hibernate3:hbm2ddl
>[INFO] Scanning for projects...
>[INFO] Searching repository for plugin with prefix: >'hibernate3'.
>[INFO] org.codehaus.mojo: checking for updates from central
>[INFO] ------------------------------------------------------------------------
>[INFO] Building Chapter 7 Simple Web Application
>[INFO] task-segment: [hibernate3:hbm2ddl]
>[INFO] ------------------------------------------------------------------------
>[INFO] Preparing hibernate3:hbm2ddl
>...
>10:24:56,151 INFO org.hibernate.tool.hbm2ddl.SchemaExport - export complete
>[INFO] ------------------------------------------------------------------------
>[INFO] BUILD SUCCESSFUL
>[INFO] ------------------------------------------------------------------------
>

实际上并非如此,直接用随书附带的源码,会得到如下提示:

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[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building Chapter 7 Simple Web Application
[INFO] task-segment: [hibernate3:hbm2ddl]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing hibernate3:hbm2ddl
[INFO] [resources:resources {execution: default-resources}]
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory E:\simple-parent\simple-webapp\src\main\resources
[INFO] [hibernate3:hbm2ddl {execution: default-cli}]
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Could not get ConfigurationTask.
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Mon Feb 06 12:42:29 CST 2012
[INFO] Final Memory: 10M/25M
[INFO] ------------------------------------------------------------------------

Could not get ConfigurationTask.这个错误我Google了一下,只找到一个相关的页面,页面上是系统变量的JDK写错了,和我这边似乎没什么关系。

如果我去除POM中的hibernate3-maven-plugin,则运行时候会显示如下错误:

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simple-webapp>mvn hibernate3:hbm2ddl
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'hibernate3'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Chapter 7 Simple Web Application
[INFO] task-segment: [hibernate3:hbm2ddl]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing hibernate3:hbm2ddl
[INFO] [resources:resources {execution: default-resources}]
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory E:\simple-parent\simple-webapp\src\main\resources
[INFO] [hibernate3:hbm2ddl {execution: default-cli}]
12:59:55,351 INFO org.hibernate.cfg.Environment - Hibernate 3.3.1.GA
12:59:55,357 INFO org.hibernate.cfg.Environment - hibernate.properties not found
12:59:55,362 INFO org.hibernate.cfg.Environment - Bytecode provider name : javassist
12:59:55,367 INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling
[INFO] Configuration XML file loaded: jar:file:/C:/Users/Niphor/.m2/repository/org/sonatype/mavenbook/ch07/simple-persist/0.6-SNAPSHOT/simple-persist-0.6-SNAPSHOT.jar!/hibernate.cfg.xml
12:59:55,418 INFO org.hibernate.cfg.Configuration - configuring from url: jar:file:/C:/Users/Niphor/.m2/repository/org/sonatype/mavenbook/ch07/simple-persist/0.6-SNAPSHOT/simple-persist-0.6-SNAPSHOT.jar!/hibernate.cfg.xml
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] An AnnotationConfiguration instance is required to use <mapping class="org.sonatype.mavenbook.weather.model.Atmosphere"/>
[INFO] ------------------------------------------------------------------------

看样子是没标明用annotation,所以提示要annotationConfiguration的实例。

Google"hibernate3:hbm2ddl"你会得到一些中文开发者的解决方法,一般都是:

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<plugin>
　<groupId>org.codehaus.mojo</groupId>
　<artifactId>hibernate3-maven-plugin</artifactId>
　<version>2.2</version>
　<configuration>
　　<componentProperties>
　　　<jdk5>true</jdk5>
　　　<implementation>annotationconfiguration</implementation>
　　</componentProperties>
　</configuration>
　<dependencies>
　　<dependency>
　　　<groupId>hsqldb</groupId>
　　　<artifactId>hsqldb</artifactId>
　　　<version>1.8.0.7</version>
　　</dependency>
　</dependencies>
</plugin>

而源码上是

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<plugin>
　<groupId>org.codehaus.mojo</groupId>
　<artifactId>hibernate3-maven-plugin</artifactId>
　<version>2.1</version>
　<configuration>
　　<components>
　　　<component>
　　　　<name>hbm2ddl</name>
　　　　<implementation>annotationconfiguration</implementation>
　　　</component>
　　</components>
　</configuration>
　<dependencies>
　　<dependency>
　　　<groupId>hsqldb</groupId>
　　　<artifactId>hsqldb</artifactId>
　　　<version>1.8.0.7</version>
　　</dependency>
　</dependencies>
</plugin>

我把

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<componentProperties>
　<jdk5>true</jdk5>
　<implementation>annotationconfiguration</implementation>
</componentProperties>

替换成了

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<components>
　<component>
　　<name>hbm2ddl</name>
　　<implementation>annotationconfiguration</implementation>
　</component>
</components>

结果不行,报错依旧,最后我发现插件版本网上2.2,而我的源码是2.1,改成2.2立即成功,且完全不需要去写

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<jdk5>true</jdk5>

即

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<version>2.2</version>
<configuration>
<components>
　<component>
　　<name>hbm2ddl</name>
　　<implementation>annotationconfiguration</implementation>
　</component>
</components>
</configuration>

直接这样就可以了…

为了这个恼人的Bug我用了数小时，结果居然是这样的…让我直接很悲哀啊…

[TOC]

笔记
maven, java