java - 简单的 scala 程序给出错误 : java. lang.InknownClassChangeError

Question

我正在使用斯坦福的主题建模工具包

这是一个在 eclipse 上运行的简单的 scala 程序

为什么我不断收到此错误线程“main”java.lang.InknownClassChangeError中的异常:实现类

import scalanlp.io._;

object Main {
  def main(args: Array[String]) {

    println("added value"+c);

    val pubmed = CSVFile("pubmed-oa-subset.csv");

    println("Success: " + pubmed.data.size + " records");


  }
}

此处完全错误

Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at scalanlp.io.CSVFile$.CSVFileAsParcel(CSVFile.scala:73)
    at Main$.main(t1.scala:27)
    at Main.main(t1.scala)

Answer 1

提供的代码是正确的...问题(很可能)是 Scala 版本问题。该 jar 是用 Scala 2.8(5 年前)编译的，引用自 http://nlp.stanford.edu/software/tmt/tmt-0.4/ :

TMT was written during 2009-10 in what is now a quite old version of Scala, using a linear algebra library that is also no longer developed. Some people still use it and find it a friendly piece of software for LDA and Labeled LDA models, and more power to you, but at this point we really can't offer any support or fix any problems. Sorry about that.

这里描述的IncompleteClassChangeError What causes java.lang.IncompatibleClassChangeError? ，是由于二进制不兼容造成的。因此唯一的选择是安装旧版本的 Scala，最好是 2.8.0。