問題情況：在idea中mybatis generator反向構建報空指標。
pom:
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.jcht</groupId>
<artifactId>ssm</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>ssm Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>ssm</finalName>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>
generatorConfig.xml 用的本地的dtd檔案
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration SYSTEM "file:///E:\program Files/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--匯入屬性配置-->
<properties resource="generator.properties"></properties>
<!--指定特定資料庫的jdbc驅動jar包的位置-->
<classPathEntry location="${jdbc.driverLocation}"/>
<context id="default" targetRuntime="MyBatis3">
<!-- optional，旨在創建class時，對注釋進行控制 -->
<commentGenerator>
<property name="suppressDate" value="https://bbs.csdn.net/topics/true"/>
<property name="suppressAllComments" value="https://bbs.csdn.net/topics/true"/>
</commentGenerator>
<!--jdbc的資料庫連接 -->
<jdbcConnection
driverClass="${jdbc.driverClass}"
connectionURL="${jdbc.connectionURL}"
userId="${jdbc.userId}"
password="${jdbc.password}">
</jdbcConnection>
<!-- 非必需，型別處理器，在資料庫型別和java型別之間的轉換控制-->
<!-- 默認false，把JDBC DECIMAL 和 NUMERIC 型別決議為 Integer
true，把JDBC DECIMAL 和 NUMERIC 型別決議為java.math.BigDecimal
-->
<javaTypeResolver>
<property name="forceBigDecimals" value="https://bbs.csdn.net/topics/false"/>
</javaTypeResolver>
<javaModelGenerator targetPackage="com.jcht.ssm.model"
targetProject="src/main/java">
<!-- 是否允許子包，即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="https://bbs.csdn.net/topics/false"/>
<!-- 是否對model添加 建構式 -->
<property name="constructorBased" value="https://bbs.csdn.net/topics/true"/>
<!-- 是否對類CHAR型別的列的資料進行trim操作 -->
<property name="trimStrings" value="https://bbs.csdn.net/topics/true"/>
<!-- 建立的Model物件是否 不可改變 即生成的Model物件不會有 setter方法，只有構造方法 -->
<property name="immutable" value="https://bbs.csdn.net/topics/false"/>
</javaModelGenerator>
<!--Mapper映射檔案生成所在的目錄 為每一個資料庫的表生成對應的SqlMap檔案 -->
<sqlMapGenerator targetPackage="com.jcht.ssm.mapper"
targetProject="src/main/java">
<property name="enableSubPackages" value="https://bbs.csdn.net/topics/false"/>
</sqlMapGenerator>
<!-- 客戶端代碼，生成易于使用的針對Model物件和XML組態檔 的代碼
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper物件
type="MIXEDMAPPER",生成基于注解的Java Model 和相應的Mapper物件
type="XMLMAPPER",生成SQLMap XML檔案和獨立的Mapper介面
-->
<javaClientGenerator targetPackage="com.jcht.ssm.dao"
targetProject="src/main/java" type="XMLMAPPER">
<property name="enableSubPackages" value="https://bbs.csdn.net/topics/true"/>
</javaClientGenerator>
<table tableName="dept" domainObjectName="Depatement"
enableCountByExample="true" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="true">
</table>
<table tableName="emp" domainObjectName="Employee"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false">
</table>
</context>
</generatorConfiguration>
generator.properties
jdbc.driverLocation= E:\\program Files\\mysql-connector-java-5.1.32.jar
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull
jdbc.userId=root
jdbc.password=123456
錯誤資訊
"C:\Program Files\Java\jdk1.8.0_141\bin\java" -Dmaven.multiModuleProjectDirectory=F:\JetBrains\IdeaProjects\Demo\ssm "-Dmaven.home=E:\program Files\maven\apache-maven-3.3.9" "-Dclassworlds.conf=E:\program Files\maven\apache-maven-3.3.9\bin\m2.conf" "-javaagent:E:\program Files\programs\JetBrains\IntelliJ IDEA 2017.2\lib\idea_rt.jar=56954:E:\program Files\programs\JetBrains\IntelliJ IDEA 2017.2\bin" -Dfile.encoding=UTF-8 -classpath "E:\program Files\maven\apache-maven-3.3.9\boot\plexus-classworlds-2.5.2.jar" org.codehaus.classworlds.Launcher -Didea.version=2017.2 -s "E:\program Files\maven\apache-maven-3.3.9\conf\settings.xml" "-Dmaven.repo.local=E:\program Files\maven\repository" mybatis-generator:generate -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building ssm Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mybatis-generator-maven-plugin:1.3.2:generate (default-cli) @ ssm ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.130 s
[INFO] Finished at: 2017-07-23T23:07:43+08:00
[INFO] Final Memory: 7M/155M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (default-cli) on project ssm: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (default-cli) on project ssm: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
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:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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)
at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
... 21 more
Caused by: java.lang.NullPointerException
at org.mybatis.generator.config.xml.ConfigurationParser.parseConfiguration(ConfigurationParser.java:127)
at org.mybatis.generator.config.xml.ConfigurationParser.parseConfiguration(ConfigurationParser.java:82)
at org.mybatis.generator.config.xml.ConfigurationParser.parseConfiguration(ConfigurationParser.java:74)
at org.mybatis.generator.maven.MyBatisGeneratorMojo.execute(MyBatisGeneratorMojo.java:196)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
... 22 more
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
Process finished with exit code 1
有知道的么，需要你們的幫助啊
uj5u.com熱心網友回復：
今天早上在公司解決了，還是dtd的問題，當時糊涂了uj5u.com熱心網友回復：
什么玩意？ dtd? 唉uj5u.com熱心網友回復：
我的是postgresql.jar包問題，所有其他都檢測了,最后實在沒辦法嘗試換jar包才好的； 非常很神奇的是： 我原來已經用postgresql.jar這個包生成很多mapper了； 但過了幾天再次使用反向工程生成mapper報錯和樓主一樣； 最后實在沒辦法，碰運氣換了個jar包；postgresql-42.2.12.jar 解決。轉載請註明出處，本文鏈接：https://www.uj5u.com/qianduan/238917.html
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