【发布时间】：2009-11-13 11:39:54
【问题描述】：
希望有人能帮我解决这个奇怪的问题。我正在尝试运行 webstart 插件，但它似乎无法在正在生成的 jar 中找到主类。 pom 尽可能简单，Test 类存在，正在编译并放入 jar 中。有人可以指出我正确的方向吗？
<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>
这是 Maven 跟踪：
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
跟踪跟随
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)
现在是由trace引起的
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 跟踪
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9 seconds
[INFO] Finished at: Fri Nov 13 11:16:54 GMT 2009
[INFO] Final Memory: 12M/22M
[INFO] ------------------------------------------------------------------------
【问题讨论】：
-
请花一些时间来格式化您目前无法阅读的问题并解释您想要实现的目标。 webstart 插件有很多目标，因此即使我可以看到您正在调用哪个目标，“我正在尝试运行 webstart pluign”也不清楚。问题是您正在混合概念，所以我不知道您要做什么。正如我所说，花一些时间来澄清并以聪明的方式提出您的问题 (catb.org/~esr/faqs/smart-questions.html)。
标签： maven-2 java-web-start maven-webstart-plugin