使用mybatis-generator添加自定义分页插件时提示无法实例化插件类

使用maven搭建 pom.xml

<build> <plugins> <!-- mybatis自动生成插件 --> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.1</version> <configuration> <verbose>true</verbose> <overwrite>true</overwrite> </configuration> </plugin> </plugins> </build>

分页插件 PaginationPlugin.java

package com.guitar.pub.plugin; import java.util.List; import org.mybatis.generator.api.CommentGenerator; import org.mybatis.generator.api.IntrospectedTable; import org.mybatis.generator.api.PluginAdapter; import org.mybatis.generator.api.dom.java.Field; import org.mybatis.generator.api.dom.java.JavaVisibility; import org.mybatis.generator.api.dom.java.Method; import org.mybatis.generator.api.dom.java.Parameter; import org.mybatis.generator.api.dom.java.PrimitiveTypeWrapper; import org.mybatis.generator.api.dom.java.TopLevelClass; import org.mybatis.generator.api.dom.xml.Attribute; import org.mybatis.generator.api.dom.xml.TextElement; import org.mybatis.generator.api.dom.xml.XmlElement; /** * <P>File name : PaginationPlugin.java </P> * <P>Author : fly </P> * <P>Date : 2013-7-2 上午11:50:45 </P> */ public class PaginationPlugin extends PluginAdapter { @Override public boolean modelExampleClassGenerated(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) { // add field, getter, setter for limit clause addLimit(topLevelClass, introspectedTable, "limitStart"); addLimit(topLevelClass, introspectedTable, "limitEnd"); return super.modelExampleClassGenerated(topLevelClass, introspectedTable); } @Override public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated( XmlElement element, IntrospectedTable introspectedTable) { // XmlElement isParameterPresenteElemen = (XmlElement) element // .getElements().get(element.getElements().size() - 1); XmlElement isNotNullElement = new XmlElement("if"); //$NON-NLS-1$ isNotNullElement.addAttribute(new Attribute("test", "limitStart != null and limitStart>=0")); //$NON-NLS-1$ //$NON-NLS-2$ // isNotNullElement.addAttribute(new Attribute("compareValue", "0")); //$NON-NLS-1$ //$NON-NLS-2$ isNotNullElement.addElement(new TextElement( "limit #{limitStart} , #{limitEnd}")); // isParameterPresenteElemen.addElement(isNotNullElement); element.addElement(isNotNullElement); return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element, introspectedTable); } private void addLimit(TopLevelClass topLevelClass, IntrospectedTable introspectedTable, String name) { CommentGenerator commentGenerator = context.getCommentGenerator(); Field field = new Field(); field.setVisibility(JavaVisibility.PROTECTED); // field.setType(FullyQualifiedJavaType.getIntInstance()); field.setType(PrimitiveTypeWrapper.getIntegerInstance()); field.setName(name); // field.setInitializationString("-1"); commentGenerator.addFieldComment(field, introspectedTable); topLevelClass.addField(field); char c = name.charAt(0); String camel = Character.toUpperCase(c) + name.substring(1); Method method = new Method(); method.setVisibility(JavaVisibility.PUBLIC); method.setName("set" + camel); method.addParameter(new Parameter(PrimitiveTypeWrapper.getIntegerInstance(), name)); method.addBodyLine("this." + name + "=" + name + ";"); commentGenerator.addGeneralMethodComment(method, introspectedTable); topLevelClass.addMethod(method); method = new Method(); method.setVisibility(JavaVisibility.PUBLIC); method.setReturnType(PrimitiveTypeWrapper.getIntegerInstance()); method.setName("get" + camel); method.addBodyLine("return " + name + ";"); commentGenerator.addGeneralMethodComment(method, introspectedTable); topLevelClass.addMethod(method); } /** * This plugin is always valid - no properties are required */ public boolean validate(List<String> warnings) { return true; } } <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!-- 数据库驱动包位置 --> <classPathEntry location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.29\mysql-connector-java-5.1.29.jar" /> <context id="DB2Tables" targetRuntime="MyBatis3"> <!-- 这里引入扩展插件 --> <plugin type="com.guitar.pub.plugin.PaginationPlugin" /> <commentGenerator> <property name="suppressAllComments" value="true" /> </commentGenerator> <!-- 数据库链接URL、用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/guitarPig" userId="root" password=""> </jdbcConnection> <javaTypeResolver> <property name="forceBigDecimals" value="false" /> </javaTypeResolver> <!-- 生成模型的包名和位置 --> <javaModelGenerator targetPackage="com.guitar.biz.user.entity" targetProject=".\src\main\java"> <property name="enableSubPackages" value="true" /> <property name="trimStrings" value="true" /> </javaModelGenerator> <!-- 生成的映射文件包名和位置 --> <sqlMapGenerator targetPackage="com.guitar.biz.user.dao" targetProject=".\src\main\java"> <property name="enableSubPackages" value="true" /> </sqlMapGenerator> <!-- 生成DAO的包名和位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.guitar.biz.user.dao" targetProject=".\src\main\java"> <property name="enableSubPackages" value="true" /> </javaClientGenerator> <!-- 要生成那些表(更改tableName和domainObjectName就可以) --> <table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" > <columnOverride column="is_use" property="isUse" javaType="Boolean"/> </table> </context> </generatorConfiguration>

错误提示

java.lang.RuntimeException: Cannot instantiate object of type com.guitar.pub.plugin.PaginationPlugin at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:137) at org.mybatis.generator.internal.ObjectFactory.createPlugin(ObjectFactory.java:174) at org.mybatis.generator.config.Context.generateFiles(Context.java:463) at org.mybatis.generator.api.MyBatisGenerator.generate(MyBatisGenerator.java:233) at org.mybatis.generator.maven.MyBatisGeneratorMojo.execute(MyBatisGeneratorMojo.java:184) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:347) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213) at org.apache.maven.cli.MavenCli.main(MavenCli.java:157) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) Caused by: java.lang.ClassNotFoundException: com.guitar.pub.plugin.PaginationPlugin at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50) at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259) at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:242) at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:227) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at org.mybatis.generator.internal.ObjectFactory.internalClassForName(ObjectFactory.java:123) at org.mybatis.generator.internal.ObjectFactory.createInternalObject(ObjectFactory.java:133) ... 25 more

Caused by: java.lang.ClassNotFoundException: com.guitar.pub.plugin.PaginationPlugin

解决方法： 将项目打成一个jar包 在pom.xml文件中添加依赖

<dependency> <groupId>xxx</groupId> <artifactId>xxx</artifactId> <version>1.0</version> <scope>system</scope> <systemPath>F:/eclipseWork/......./src/main/webapp/WEB-INF/lib/YMPlugin1.0.jar</systemPath> </dependency>

执行插件，生成代码。