可怕的java.lang.NoClassDefFoundError(The dreaded java.lang.NoClassDefFoundError)
我已经浏览了很多关于这个错误的现有线索，但仍然没有运气。 我甚至没有试图打包jar或使用任何第三方打包工具。 我只是从Eclipse内部运行（很好），然后尝试从命令行运行完全相同的应用程序，在它构建的相同位置（出现此错误）。 我的目标是能够压缩bin文件夹并通过命令行脚本将其发送给其他人运行。 一些细节：
- 这是一个命令行应用程序，我将commons-lang-2.4.jar用于字符串实用程序。 这是无法找到的文件（特定于“java.lang.NoClassDefFoundError：org / apache / commons / lang / StringEscapeUtils”）
- 我有我的lib文件夹中的jar，并通过右键单击“Build Path - > Add to Build Path”将它添加到Eclipse中的构建路径中
- .classpath文件看起来是正确的，并包含对jar的引用，但我认为该文件仅供Eclipse使用（包含以下行：
<classpathentry kind="lib" path="lib/commons-lang-2.4.jar"/>）- 这可能与Eclipse工作目录设置有关吗？ 我创建了一些内部模板文件，这些模板文件位于src / templates下，并且我似乎可以看到这些内容的唯一方式是将项目工作目录设置为AppName / src。 也许我应该把这些放在别的地方？
让我知道，如果任何额外的信息会有所帮助。 当然这很简单，但是在这一点上我浪费了太多时间。 这提醒了我为什么最初在2005年左右将Java留在了......
I've looked through many of the existing threads about this error, but still no luck. I'm not even trying to package a jar or use any third-party packaging tools. I'm simply running from within Eclipse (works great) and then trying to run the exact same app from the command line, in the same location it's built to (getting this error). My goal is to be able to zip up the bin folder and send it off to be run by someone else via a command line script. Some details:
- It's a command-line app and I'm using the commons-lang-2.4.jar for string utilities. That is the file that cannot be located (specificaly "java.lang.NoClassDefFoundError: org/apache/commons/lang/StringEscapeUtils")
- I have that jar in my lib folder and have added it to my build path in Eclipse via right-click "Build Path -> Add to Build Path"
- The .classpath file looks correct and contains the reference to the jar, but I assume that file is only used by Eclipse (contains this line:
<classpathentry kind="lib" path="lib/commons-lang-2.4.jar"/>)- Could this be related to the Eclipse working directory setting? I have some internal template files that I created that are under src/templates, and the only way I can seem to get those to be seen is by setting the project working directory to AppName/src. Maybe I should be putting those somewhere else?
Let me know if any additional info would help. Surely this is something simple, but I've wasted too much time on it at this point. This is reminding me why I originally left Java back in '05 or so...
原文：https://stackoverflow.com/questions/1702852
更新时间：2022-10-09 16:10
最满意答案
您可以通过
Model#schema访问Mongoose模型的Model#schema，所以您可以：// Ensure the base model is defined first. require('./base.server.model.js'); var RegionSchema = new Schema({ name: {type: String}, user: {type: Schema.ObjectId, ref: 'User'}, bases: [mongoose.model('Base').schema] }); mongoose.model('Region', RegionSchema);You can access a Mongoose Model's schema via
Model#schema, so you can do:// Ensure the base model is defined first. require('./base.server.model.js'); var RegionSchema = new Schema({ name: {type: String}, user: {type: Schema.ObjectId, ref: 'User'}, bases: [mongoose.model('Base').schema] }); mongoose.model('Region', RegionSchema);
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