从Eclipse通过Ant运行小程序

Question

从Eclipse通过Ant运行小程序

5

我希望你能够在build.xml中启动一个小程序，像这样：

：

<java classname="sun.applet.AppletViewer" classpath="${libraries}">
</java>

至少在NetBeans中是这样的。

但我收到了错误信息：

 [java] JVM args ignored when same JVM is used.
 [java] Could not find sun.applet.AppletViewer. Make sure you have it in your classpath
 [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:138)
 [java]     at org.apache.tools.ant.taskdefs.Java.run(Java.java:764)
 [java]     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:218)
 [java]     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:132)
 [java]     at org.apache.tools.ant.taskdefs.Java.execute(Java.java:105)
 [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
 [java]     at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [java]     at java.lang.reflect.Method.invoke(Method.java:597)
 [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 [java]     at org.apache.tools.ant.Task.perform(Task.java:348)
 [java]     at org.apache.tools.ant.Target.execute(Target.java:357)
 [java]     at org.apache.tools.ant.Target.performTasks(Target.java:385)
 [java]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
 [java]     at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
 [java]     at org.eclipse.ant.internal.launching.remote.EclipseSingleCheckExecutor.executeTargets(EclipseSingleCheckExecutor.java:30)
 [java]     at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
 [java]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416)
 [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [java]     at java.lang.reflect.Method.invoke(Method.java:597)
 [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 [java]     at org.apache.tools.ant.Task.perform(Task.java:348)
 [java]     at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:62)
 [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [java]     at java.lang.reflect.Method.invoke(Method.java:597)
 [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 [java]     at org.apache.tools.ant.Task.perform(Task.java:348)
 [java]     at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:394)
 [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [java]     at java.lang.reflect.Method.invoke(Method.java:597)
 [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 [java]     at org.apache.tools.ant.Task.perform(Task.java:348)
 [java]     at org.apache.tools.ant.Target.execute(Target.java:357)
 [java]     at org.apache.tools.ant.Target.performTasks(Target.java:385)
 [java]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
 [java]     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
 [java]     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
 [java]     at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
 [java]     at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
 [java]     at org.eclipse.ant.internal.launching.remote.InternalAntRunner.run(InternalAntRunner.java:423)
 [java]     at org.eclipse.ant.internal.launching.remote.InternalAntRunner.main(InternalAntRunner.java:137)
 [java] Java Result: -1

似乎classpath="..."参数覆盖了eclipse-ant默认的classpath。不幸的是，我确实需要指定一个额外的classpath。

- clamp

我猜你需要将tools.jar添加到你的类路径中。 - Tim Büthe

@Tim：我已经将 rt.jar 添加到 classpath 中了，但是接着我得到了这个异常：java.lang.IllegalAccessError: tried to access class sun.applet.AppletMessageHandler from class sun.applet.AppletViewer。 - clamp

尝试去掉classpath参数（和jvm参数），然后它会使用启动时的classpath。 - Tim Büthe

1

@Tim：是的，谢谢，那是正确的。不幸的是，我需要指定一个额外的类路径。 - clamp

重点是，这证明了你的类路径不完整。我猜AppletViewer在某个JVM库中，比如tools.jar。找到这个jar并将其添加到你的类路径中。 - Tim Büthe

2个回答

1

这个很好用：

<project default="test">

<target name="test">
    <java classname="sun.applet.AppletViewer">
        <arg value="http://java.sun.com/applets/jdk/1.4/demo/applets/BarChart/example1.html"/>
    </java>
</target>

</project>

- Tim Büthe

1

是的，它能工作是因为没有 classpath="" 参数。不幸的是，我确实需要用一些变量来指定它。 - clamp

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- Plínio Pantaleão · Accepted Answer

尝试使用fork参数。

<java classname="sun.applet.AppletViewer" classpath="${libraries}" fork="true">

将创建一个新的JVM进程并运行您的小程序。