数据核增强剂javaw:“参数不正确" [英] datanucleus enhancer & javaw: "the parameter is incorrect"

问题描述

我在Windows XP上使用Eclipse和gwt + gae应用程序的datanucleus增强器.运行增强器时，出现错误:

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

我以前遇到过这个问题，这是由于类路径较长.我只是花了一个半小时来缩短类路径，方法是四处移动库甚至移动eclipse安装，但是没有运气.

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.

关于我应该从哪里开始寻找答案的任何想法?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.真是气死我了！是否可以使javaw的输出更详细?可以解决这个类路径大小错误吗?

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?

推荐答案

啊哈！

在Project属性下> Google> App Engine> 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.我刚刚配置了该属性页面，使其仅增强了部分类(仅需要5％的增强)，现在，它不仅可以再次工作，而且构建过程非常快捷！

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!

这篇关于数据核增强剂javaw:“参数不正确"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！