从 scala 文件创建可执行 jar 时出现问题
我正在尝试使用 IntelliJ 9.0 将我的项目导出为 jar。我的项目在 Intellij 中编译和运行没有问题，但是当我将其写入 .jar 并打开它时，它会显示错误。
我的主类类似于：
package Main
//Imports
object Main{
def main(args: Array[String]) {
println("Main: Hello, world!")
//do stuff
}
现在，在工件窗口中，我创建了一个包含以下内容的 .jar：
- 主类：
Main.Main - 类路径：
lib/javacsv lib/scala-compiler。 jar lib/scala-library.jar lib/scalatest-1.0-test.jar lib/scalatest-1.0.jar lib/tools.jar lib/jtds-1.2.2.jar lib/flex-messaging-common.jar lib/flex -messaging-core.jar lib/spring.jar lib/mysql-connector-java-5.1.7-bin.jar lib/ojdbc14.jar lib/commons-logging.jar lib/postgresql-8.4-701.jdbc3.jar lib /log4j-1.2.15.jar lib/poi-3.6-20091214.jar lib/poi-ooxml-3.6-20091214.jar lib/dom4j-1.6.1.jar lib/poi-ooxml-schemas-3.6-20091214.jar lib/geronimo-stax-api_1.0_spec-1.0.jar lib/xmlbeans-2.3.0.jar lib/rt.jar lib/ifxjdbc.jar lib/db2jcc4.jar
我已经仔细检查过所有这些类都是在该项目上，并且是该项目上唯一的课程。请注意，它包含 lib/scala-compiler.jar 和 lib/scala-library.jar。
构建项目：java -jar myScalaApp.jar，我得到：
Exception in thread "main" java.lang.NoClassDefFoundError: scala/ScalaObject
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:675)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
at Main.Main.main(Main.scala)
Caused by: java.lang.ClassNotFoundException: scala.ScalaObject
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
... 13 more
我知道它没有找到 scala 类，但我确保它们在那里。还有什么问题，我该如何解决它？
I'm tryign to export my project as a jar with IntelliJ 9.0. My project compiles and runs with no problem in Intellij, but when I write it to a .jar and open it, it will show an error.
My Main class is something like:
package Main
//Imports
object Main{
def main(args: Array[String]) {
println("Main: Hello, world!")
//do stuff
}
Now, in the artifacts window I created a .jar with the following:
- Main Clas:
Main.Main - Class Path:
lib/javacsv lib/scala-compiler.jar lib/scala-library.jar lib/scalatest-1.0-test.jar lib/scalatest-1.0.jar lib/tools.jar lib/jtds-1.2.2.jar lib/flex-messaging-common.jar lib/flex-messaging-core.jar lib/spring.jar lib/mysql-connector-java-5.1.7-bin.jar lib/ojdbc14.jar lib/commons-logging.jar lib/postgresql-8.4-701.jdbc3.jar lib/log4j-1.2.15.jar lib/poi-3.6-20091214.jar lib/poi-ooxml-3.6-20091214.jar lib/dom4j-1.6.1.jar lib/poi-ooxml-schemas-3.6-20091214.jar lib/geronimo-stax-api_1.0_spec-1.0.jar lib/xmlbeans-2.3.0.jar lib/rt.jar lib/ifxjdbc.jar lib/db2jcc4.jar
I have double checked that all those classes are on the project and are the onnly classes on it. Notice that it inlcudes lib/scala-compiler.jar and lib/scala-library.jar.
Build the project: java -jar myScalaApp.jar and I get:
Exception in thread "main" java.lang.NoClassDefFoundError: scala/ScalaObject
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:675)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
at Main.Main.main(Main.scala)
Caused by: java.lang.ClassNotFoundException: scala.ScalaObject
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
... 13 more
I understand that it's not finding the scala classes but I made sure they are there. What else can be the problem and how could I fix it?
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评论（2）
我想说有两件事出了问题：
我不知道 IntelliJ 如何构建你的 jar：它是否解压所有库 jar 并将它们与你的代码一起放入一个大 jar 中，或者是否将库 jar 按原样添加到你的大 jar 中并操作类路径以获取在罐中罐？
第一点很容易检查：使用
jar -tvf yourJar.jar列出 jar 的内容，或者使用存档查看器以图形方式查看它。请注意，.jar基本上是.zip，因此您可以重命名扩展名，然后使用可以查看.zip文件的工具。只是对第二部分有一个想法：您可以构建一个简单的 Java 主类来打印
System.getProperty("java.class.path")吗？ Java 类应该能够在该 jar 中运行，即使 Scala 类不能运行。I'd say one of two things has gone wrong:
scala-library.jaris not in your jar; orscala-library.jar.I don't know how IntelliJ builds your jar: Does it unpack all your library jars and mung them together with your code into one big jar, or does it add the library jars as-is to your big jar and manipulate the classpath to get at the jars-within-jar?
The first point is easy enough to check: Either use
jar -tvf yourJar.jarto list out the contents of your jar, or use an archive viewer to look into it graphically. Note that a.jaris basically a.zip, so you can rename the extension and then use a tool that can look into.zipfiles.Just had an idea about the second part: Can you build a simple Java main class that prints out
System.getProperty("java.class.path")? A Java class should be able to run in that jar even if a Scala class isn't.至少有三种方法可以做到这一点。 （一个适用于 Netbeans，但也应该在 Idea 中工作）
There are at least three ways to do this. (One applies to Netbeans but should work in Idea too)