Maven webstart插件沒有找到依賴項

Question

希望有人能幫助我解決這個奇怪的問題。 我正在嘗試運行webstart插件但它似乎無法找到正在生成的jar中的主類。 pom就像它可以獲得的那樣簡單，並且類Test存在，並且正在被編譯並放置在jar中。 有人可以指點我正確的方向嗎？

<project>
  <modelVersion>4.0.0</modelVersion>
  <name>Desktop Components</name>
  <groupId>com.test</groupId>
  <artifactId>test</artifactId>
  <version>1.0</version>
  <packaging>jar</packaging>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo.webstart</groupId>
        <artifactId>webstart-maven-plugin</artifactId>
        <executions>
          <execution>
            <phase>process-resources</phase>
            <goals>
              <goal>jnlp-download-servlet</goal>
            </goals>
          </execution>
        </executions>

        <configuration>
          <jnlpFiles>
            <jnlpFile>
              <jarResources>
                <jarResource>
                  <groupId>com.test</groupId>
                  <artifactId>test</artifactId>
                  <version>1.0</version>
                  <mainClass>Test</mainClass>
                </jarResource>
              </jarResources>
            </jnlpFile>
          </jnlpFiles>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

這是Maven的跟蹤：

C:\TEMP\webstart-test>mvn webstart:jnlp –e
+ Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building Desktop Components
[INFO]    task-segment: [webstart:jnlp] (aggregator-style)
[INFO] ------------------------------------------------------------------------
[INFO] Preparing webstart:jnlp
[INFO] ------------------------------------------------------------------------
[INFO] Building Desktop Components
[INFO] ------------------------------------------------------------------------
[INFO] [resources:resources {execution: default-resources}]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\TEMP\webstart-test\src\main\resources
[INFO] [webstart:jnlp-download-servlet {execution: default}]
[INFO] No templateFilename found for launch2.jnlp. Will use the default template.
[INFO] No resources found in C:\TEMP\webstart-test\src\main\jnlp\resources
Downloading: http://repo1.maven.org/maven2/com/test/test/1.0/test-1.0.pom
[INFO] Unable to find resource 'com.test:test:pom:1.0' in repository central (http://repo1.maven.org/maven2)
No template specified Using default one.

***** Webstart JAR URL: jar:file:/C:/apache-maven-2.2.1/repo/org/codehaus/mojo/webstart/webstart-maven-plugin/1.0-alpha-2/webstart-maven-plugin-1.0-alpha-2.jar!
/
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Nothing to compile - all classes are up to date
[INFO] [resources:testResources {execution: default-testResources}]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\TEMP\webstart-test\src\test\resources
[INFO] [compiler:testCompile {execution: default-testCompile}]
[INFO] No sources to compile
[INFO] [surefire:test {execution: default-test}]
[INFO] No tests to run.
[INFO] [jar:jar {execution: default-jar}]
[INFO] Building jar: C:\TEMP\webstart-test\target\test-1.0.jar
[INFO] [webstart:jnlp {execution: default-cli}]
[INFO] No resources found in C:\TEMP\webstart-test\src\main\jnlp\resources
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Failure to run the plugin:
[INFO] ------------------------------------------------------------------------
[INFO] Trace

跟蹤如下

org.apache.maven.lifecycle.LifecycleExecutionException: Failure to run the plugin:
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:284)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        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:592)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

現在引起的痕跡

Caused by: org.apache.maven.plugin.MojoExecutionException: Failure to run the plugin:
        at org.codehaus.mojo.webstart.AbstractJnlpMojo.execute(AbstractJnlpMojo.java:289)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        ... 17 more

Caused by: java.lang.NullPointerException
        at org.codehaus.mojo.webstart.AbstractJnlpMojo.execute(AbstractJnlpMojo.java:214)
        ... 19 more

最后的Maven追蹤

[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9 seconds
[INFO] Finished at: Fri Nov 13 11:16:54 GMT 2009
[INFO] Final Memory: 12M/22M
[INFO] ------------------------------------------------------------------------

Answer 1

這是mainClass for JNLP的問題

你需要這樣的東西

<configuration>
   <jnlp>
      <mainClass>com.test.Test</mainClass>
   </jnlp>
<configuration>

Answer 2

為了解決這個問題：

沒有找到主類的工件：null。 你指定了嗎？

我必須創建一個多模塊maven項目，如下所示：

• 基地項目
  • 主應用程序
  • 在webstart

然后在webstart的pom文件中，我將main-app作為依賴項。 最后，從webstart目錄中運行mvn webstart:jnlp 。

Answer 3

我相信這不再是你的問題，因為這個問題已經有一年了。 但是，為了完整起見......

我編輯了這個問題，使其具有可讀性。 這向我們展示了錯誤是在AbstractJnlpMojo的第214行。 查看第214行的最新版本源代碼 （上面的根本原因），我們可以看到這是因為您沒有為JNLP文件指定main方法。

JNLP不需要在jar資源中指定的main方法類。 它也需要它在JNLP標簽中，就像這樣。

    <configuration>
      <jnlp>
        <mainClass>com.test.Test</mainClass>
      </jnlp>
    </configuration>

由於代碼已更改，如果您今天這樣做，您將獲得以下異常（更具可讀性）：

org.apache.maven.plugin.MojoExecutionException: 
  didn't find artifact with main class: null. Did you specify it? 

Answer 4

我不認為它是你的依賴關系，而是C：\\ TEMP \\ webstart-test \\ src \\ main \\ jnlp \\ resources中的一些文件，例如你的jnlp文件的Velocity模板可能嗎？