数据核增强剂和javaw: “参数不正确”
我在 Windows XP 上使用 Eclipse 和 gwt + gae 应用程序的 datanucleus 增强器。当我运行增强器时，出现错误：
Error
Thu Oct 21 16:33:57 CDT 2010
Cannot run program "C:\Program Files\Java\jdk1.6.0_18\bin\javaw.exe" (in directory "C:\ag\dev"): CreateProcess error=87, The parameter is incorrect
java.io.IOException: Cannot run program "C:\Program Files\Java\jdk1.6.0_18\bin\javaw.exe" (in directory "C:\ag\dev"): CreateProcess error=87, The parameter is incorrect
at java.lang.ProcessBuilder.start(Unknown Source)
at com.google.gdt.eclipse.core.ProcessUtilities.launchProcessAndActivateOnError(ProcessUtilities.java:213)
at com.google.appengine.eclipse.core.orm.enhancement.EnhancerJob.runInWorkspace(EnhancerJob.java:154)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.io.IOException: CreateProcess error=87, The parameter is incorrect
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 5 more
我以前遇到过这个问题，这是由于类路径很长造成的。我刚刚花了一个半小时通过移动库甚至移动我的 eclipse 安装来缩短我的类路径，但没有运气。
关于我应该从哪里开始寻找答案有什么想法吗？该错误消息不包含有关其所在目录或任何内容的任何信息。实在是有点让人气愤啊！是否可以使 javaw 的输出更详细？是否可以解决这个类路径大小错误？
I'm on windows XP using eclipse and the datanucleus enhancer for a gwt + gae app. When I run the enhancer, I get an error:
Error
Thu Oct 21 16:33:57 CDT 2010
Cannot run program "C:\Program Files\Java\jdk1.6.0_18\bin\javaw.exe" (in directory "C:\ag\dev"): CreateProcess error=87, The parameter is incorrect
java.io.IOException: Cannot run program "C:\Program Files\Java\jdk1.6.0_18\bin\javaw.exe" (in directory "C:\ag\dev"): CreateProcess error=87, The parameter is incorrect
at java.lang.ProcessBuilder.start(Unknown Source)
at com.google.gdt.eclipse.core.ProcessUtilities.launchProcessAndActivateOnError(ProcessUtilities.java:213)
at com.google.appengine.eclipse.core.orm.enhancement.EnhancerJob.runInWorkspace(EnhancerJob.java:154)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.io.IOException: CreateProcess error=87, The parameter is incorrect
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 5 more
I've had this problem before, and it was due to a long classpath. I just spent an hour and a half shortening my classpath by moving libraries around and even moving my eclipse install, but with no luck.
Any ideas about where I should start to look for an answer? The error message doesn't include any information about what directory it's in or anything. It's kind of infuriating! Is it possible to make the output of javaw more verbose? Is it possible to get around this class-path size bug?
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啊哈！
在项目属性>下谷歌>应用程序引擎> ORM 我发现我的所有类都得到了增强，这导致命令行太长——显然与类路径无关。我刚刚配置该属性页以仅增强我的类的子集（仅 5％ 需要增强），现在，它不仅可以再次工作，而且构建过程更快！
Aha!
Under Project properties > Google > App Engine > ORM I found that all of my classes were being enhanced, which was leading to a command line that was too long - nothing to do with the classpath, apparently. I just configured that property page to only enhance a subset of my classes (only like 5% need enhancing), and now, not only does it work again, but the build process is WAY FASTER!