的Maven Exec插件主類失蹤

我試圖去通過Hibernate的教程，並就死在運行命令的Maven Exec插件主類失蹤

C:\Users\Eyal\workspace\FirstHibernateTutorial>mvn exec:java -Dexec.mainclass="o 
rg.hsqldb.Server" -Dexec.args="-database.O file:target/data/tutorial" -e

，並得到這些錯誤。

[INFO] Error stacktraces are turned on. 
[INFO] Scanning for projects... 
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for 
org.hibernate.tutorials:hibernate-tutorial:jar:1.0.0-SNAPSHOT 
[WARNING] The expression ${artifactId} is deprecated. Please use ${project.artif 
actId} instead. 
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten t 
he stability of your build. 
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support buildin 
g such malformed projects. 
[WARNING] 
[INFO] 
[INFO] ------------------------------------------------------------------------ 
[INFO] Building First Hibernate Tutorial 1.0.0-SNAPSHOT 
[INFO] ------------------------------------------------------------------------ 
[INFO] 
[INFO] >>> exec-maven-plugin:1.2:java (default-cli) @ hibernate-tutorial >>> 
[INFO] 
[INFO] <<< exec-maven-plugin:1.2:java (default-cli) @ hibernate-tutorial <<< 
[INFO] 
[INFO] --- exec-maven-plugin:1.2:java (default-cli) @ hibernate-tutorial --- 
[INFO] ------------------------------------------------------------------------ 
[INFO] BUILD FAILURE 
[INFO] ------------------------------------------------------------------------ 
[INFO] Total time: 1.964s 
[INFO] Finished at: Thu Apr 21 18:31:10 IDT 2011 
[INFO] Final Memory: 4M/15M 
[INFO] ------------------------------------------------------------------------ 
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2:java (def 
ault-cli) on project hibernate-tutorial: The parameters 'mainClass' for goal org 
.codehaus.mojo:exec-maven-plugin:1.2:java are missing or invalid -> [Help 1] 
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal o 
rg.codehaus.mojo:exec-maven-plugin:1.2:java (default-cli) on project hibernate-t 
utorial: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin 
:1.2:java are missing or invalid 
     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor 
.java:221) 
     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.buildProje 
ct(LifecycleModuleBuilder.java:84) 
     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProje 
ct(LifecycleModuleBuilder.java:59) 
     at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBu 
ild(LifecycleStarter.java:183) 
     at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(Lifecycl 
eStarter.java:161) 
     at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319) 
     at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) 
     at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) 
     at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) 
     at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. 
java:39) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces 
sorImpl.java:25) 
     at java.lang.reflect.Method.invoke(Method.java:597) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Laun 
cher.java:290) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.jav 
a:230) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(La 
uncher.java:409) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java: 
352) 
Caused by: org.apache.maven.plugin.PluginParameterException: The parameters 'mai 
nClass' for goal org.codehaus.mojo:exec-maven-plugin:1.2:java are missing or inv 
alid 
     at org.apache.maven.plugin.internal.DefaultMavenPluginManager.populatePl 
uginFields(DefaultMavenPluginManager.java:576) 
     at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getConfigu 
redMojo(DefaultMavenPluginManager.java:529) 
     at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(Default 
BuildPluginManager.java:92) 
     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor 
.java:209) 
     ... 19 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 rea 
d the following articles: 
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginParamete 
rException

我確實在pom文件中改變了一件事。我添加了依賴關係的版本。這是pom.xml。我改變了它，因爲沒有它，我得到關於缺乏版本規範的錯誤。

<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>org.hibernate.tutorials</groupId> 
    <artifactId>hibernate-tutorial</artifactId> 
    <version>1.0.0-SNAPSHOT</version> 
    <name>First Hibernate Tutorial</name> 

    <build> 
     <!-- we dont want the version to be part of the generated war file name --> 
     <finalName>${artifactId}</finalName> 
    </build> 

    <dependencies> 
     <dependency> 
      <groupId>org.hibernate</groupId> 
      <artifactId>hibernate-core</artifactId> 
      <version>3.3.1.GA</version> 
     </dependency> 

     <!-- Because this is a web app, we also have a dependency on the servlet api. --> 
     <dependency> 
      <groupId>javax.servlet</groupId> 
      <artifactId>servlet-api</artifactId> 
      <version>[2.4,)</version> 
     </dependency> 

     <!-- Hibernate uses slf4j for logging, for our purposes here use the simple backend --> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>slf4j-simple</artifactId> 
      <version>1.5.6</version> 
     </dependency> 

     <!-- Hibernate gives you a choice of bytecode providers between cglib and javassist --> 
     <dependency> 
      <groupId>javassist</groupId> 
      <artifactId>javassist</artifactId> 
      <version>[3.0,)</version> 
     </dependency> 
    </dependencies> 
</project>

我認爲主要問題是在該行

The parameters 'mainClass' for goal org .codehaus.mojo:exec-maven-plugin:1.2:java are missing or invalid -> [Help 1]

爲什麼mainClass是不是有效？你能看到我不喜歡的東西嗎？

編輯：

OK，我改變了「mainclass」到「mainClass」，它給了我這個錯誤關於沒有找到「像org.hsqldb.Server」。我將hsqldb.jar添加到Eclipse的參考庫中，但它仍然給我提供了同樣的錯誤。

這是堆疊印刷：

C:\Users\Eyal\workspace\FirstHibernateTutorial>mvn exec:java -Dexec.mainClass="o 
rg.hsqldb.Server" -Dexec.args="-database.O file:target/data/tutorial" -e 
[INFO] Error stacktraces are turned on. 
[INFO] Scanning for projects... 
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for 
org.hibernate.tutorials:hibernate-tutorial:jar:1.0.0-SNAPSHOT 
[WARNING] The expression ${artifactId} is deprecated. Please use ${project.artif 
actId} instead. 
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten t 
he stability of your build. 
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support buildin 
g such malformed projects. 
[WARNING] 
[INFO] 
[INFO] ------------------------------------------------------------------------ 
[INFO] Building First Hibernate Tutorial 1.0.0-SNAPSHOT 
[INFO] ------------------------------------------------------------------------ 
[INFO] 
[INFO] >>> exec-maven-plugin:1.2:java (default-cli) @ hibernate-tutorial >>> 
[INFO] 
[INFO] <<< exec-maven-plugin:1.2:java (default-cli) @ hibernate-tutorial <<< 
[INFO] 
[INFO] --- exec-maven-plugin:1.2:java (default-cli) @ hibernate-tutorial --- 
[INFO] ------------------------------------------------------------------------ 
[INFO] BUILD FAILURE 
[INFO] ------------------------------------------------------------------------ 
[INFO] Total time: 1.106s 
[INFO] Finished at: Sat Apr 23 10:46:09 IDT 2011 
[INFO] Final Memory: 4M/15M 
[INFO] ------------------------------------------------------------------------ 
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2:java (def 
ault-cli) on project hibernate-tutorial: An exception occured while executing th 
e Java class. org.hsqldb.Server -> [Help 1] 
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal o 
rg.codehaus.mojo:exec-maven-plugin:1.2:java (default-cli) on project hibernate-t 
utorial: An exception occured while executing the Java class. org.hsqldb.Server 
     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor 
.java:217) 
     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.buildProje 
ct(LifecycleModuleBuilder.java:84) 
     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProje 
ct(LifecycleModuleBuilder.java:59) 
     at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBu 
ild(LifecycleStarter.java:183) 
     at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(Lifecycl 
eStarter.java:161) 
     at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319) 
     at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) 
     at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) 
     at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) 
     at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. 
java:39) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces 
sorImpl.java:25) 
     at java.lang.reflect.Method.invoke(Method.java:597) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Laun 
cher.java:290) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.jav 
a:230) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(La 
uncher.java:409) 
     at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java: 
352) 
Caused by: org.apache.maven.plugin.MojoExecutionException: An exception occured 
while executing the Java class. org.hsqldb.Server 
     at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:346) 
     at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(Default 
BuildPluginManager.java:101) 
     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor 
.java:209) 
     ... 19 more 
Caused by: java.lang.ClassNotFoundException: org.hsqldb.Server 
     at java.net.URLClassLoader$1.run(URLClassLoader.java:202) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:190) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:307) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:248) 
     at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:284) 
     at java.lang.Thread.run(Thread.java:662) 
[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 rea 
d the following articles: 
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionE 
xception 
C:\Users\Eyal\workspace\FirstHibernateTutorial>

來源

2011-04-21 Eyal

應該mainClass不mainclass。

-Dexec.mainClass="org.hsqldb.Server"

瞭解更多關於此here和here。

而且HSQLDB應該在你的Maven的依賴關係：

<dependency> 
    <groupId>org.hsqldb</groupId> 
    <artifactId>hsqldb</artifactId> 
    <version>2.0.0</version> 
</dependency>

來源

2011-04-21 15:54:33 CoolBeans

嗨，謝謝你的回答...你能告訴它爲什麼會卡住「java.lang.ClassNotFoundException：org.hsqldb.Server」嗎？ – Eyal 2011-04-23 07:56:53

@Eyal - 在你的pom.xml中添加這個依賴項。 ' org.hsqldb HSQLDB 2.0.0 ' – CoolBeans 2011-04-23 13:34:38

失蹤了 'EXEC' 前綴，錯誤消息應該給予充分的參數名稱，而不是隻是：'參數 'mainClass'目標org.codehaus.mojo：exec-maven-plugin：1.2.1：java丟失或無效 – 2013-09-12 20:12:57

請注意，是「配置」部分必須走出執行部分（見下面的例子）。否則，你會得到「缺失或無效的mainClass」錯誤。

  <plugin> 
       <groupId>org.codehaus.mojo</groupId> 
       <artifactId>exec-maven-plugin</artifactId> 
       <version>1.2</version> 
       <dependencies> 
        <dependency> 
         <groupId>org.versly</groupId> 
         <artifactId>versly-wsdoc</artifactId> 
         <version>1.0-SNAPSHOT</version> 
         <scope>compile</scope> 
        </dependency> 
       </dependencies> 
       <executions> 
        <execution> 
         <phase>prepare-package</phase> 
         <goals> 
          <goal>java</goal> 
         </goals> 
        </execution> 
       </executions> 
       <configuration> 
        <mainClass>org.versly.rest.wsdoc.RestDocAssembler</mainClass> 
        <arguments> 
         <argument>${project.build.directory}/classes</argument> 
        </arguments> 
       </configuration> 
      </plugin>

來源

2013-11-26 17:23:40

的Maven Exec插件主類失蹤

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