如何在jvm上运行生成的frege java代码？

哈斯凯尔·弗雷格的世界你好：

您好.fr:

module Hello where

main args = do
    putStrLn "Hello, World!"

此代码生成hello.java：

/*
  Source code is in UTF-8 encoding. The following symbols may appear, among others:
  α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω « • ¦ » ∀ ∃ ∷ … → ← fi fl ƒ
  If you can't read this, you're out of luck. This code was generated with the frege compiler version 3.24.80
  from hello.fr Do not edit this file! Instead, edit the source file and recompile.
*/

import frege.run8.Func;
import frege.run8.Lazy;
import frege.run8.Thunk;
import frege.run.Kind;
import frege.run.RunTM;
import frege.runtime.Meta;
import frege.runtime.Phantom.RealWorld;
import frege.Prelude;
import frege.control.Category;
import frege.control.Semigroupoid;
import frege.java.IO;
import frege.java.Lang;
import frege.java.Util;
import frege.java.util.Regex;
import frege.prelude.Maybe;
import frege.prelude.PreludeArrays;
import frege.prelude.PreludeBase;
import frege.prelude.PreludeIO;
import frege.prelude.PreludeList;
import frege.prelude.PreludeMonad;
import frege.prelude.PreludeText;

@SuppressWarnings("unused")
@Meta.FregePackage(
  source="hello.fr", time=1470398249962L, jmajor=1, jminor=8,
  imps={
    "frege.Prelude", "frege.prelude.PreludeArrays", "frege.prelude.PreludeBase", "frege.prelude.PreludeIO",
    "frege.prelude.PreludeList", "frege.prelude.PreludeMonad", "frege.prelude.PreludeText", "frege.java.util.Regex"
  },
  nmss={"Prelude", "PreludeArrays", "PreludeBase", "PreludeIO", "PreludeList", "PreludeMonad", "PreludeText", "Regexp"},
  symas={}, symcs={}, symis={}, symts={},
  symvs={@Meta.SymV(offset=20, name=@Meta.QName(pack="Hello", base="main"), stri="s(u)", sig=1, depth=1, rkind=49)},
  symls={},
  taus={
    @Meta.Tau(kind=2, suba=0, tcon={@Meta.QName(kind=0, pack="frege.prelude.PreludeBase", base="[]")}),
    @Meta.Tau(kind=2, suba=0, tcon={@Meta.QName(kind=0, pack="frege.prelude.PreludeBase", base="StringJ")}),
    @Meta.Tau(kind=2, suba=0, tcon={@Meta.QName(kind=0, pack="frege.prelude.PreludeBase", base="Char")}),
    @Meta.Tau(kind=0, suba=1, subb=2), @Meta.Tau(kind=0, suba=0, subb=3),
    @Meta.Tau(kind=2, suba=0, tcon={@Meta.QName(kind=0, pack="frege.prelude.PreludeBase", base="ST")}),
    @Meta.Tau(kind=2, suba=0, tcon={@Meta.QName(kind=0, pack="frege.prelude.PreludeBase", base="RealWorld")}),
    @Meta.Tau(kind=0, suba=5, subb=6),
    @Meta.Tau(kind=2, suba=0, tcon={@Meta.QName(kind=0, pack="frege.prelude.PreludeBase", base="()")}),
    @Meta.Tau(kind=0, suba=7, subb=8)
  },
  rhos={@Meta.Rho(rhofun=false, rhotau=4), @Meta.Rho(rhofun=false, rhotau=9), @Meta.Rho(sigma=0, rhotau=1)},
  sigmas={@Meta.Sigma(rho=0), @Meta.Sigma(rho=2)}, exprs={@Meta.Expr()}
)
final public class Hello  {





final public static Func.U<RealWorld, Short> $main(final Lazy<PreludeBase.TList<String/*<Character>*/>> arg$1) {
  return Prelude.putStrLn("Hello, World!");
}

  public static void main(final java.lang.String[] argv) {
    try {
      frege.run.RunTM.argv = argv;

        PreludeBase.TST.<Short>performUnsafe($main
               (Thunk.lazy(PreludeArrays.IListSource_JArray.<String/*<Character>*/>toList(argv)))
          ).call();
      frege.runtime.Runtime.stdout.get().close();
      frege.runtime.Runtime.stderr.get().close();

    } finally { frege.run.Concurrent.shutDownIfExists(); }
  }
}

然后我尝试运行代码：

cd build
java Hello

但这会返回一个错误：

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: frege/run8/Lazy
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
    at java.lang.Class.getMethod0(Class.java:3018)
    at java.lang.Class.getMethod(Class.java:1784)
    at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: frege.run8.Lazy
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 7 more

如何在jvm上运行生成的frege java代码

---

我使用的是java8

启动命令时，您还需要在类路径中添加

frege3.jar

，因此请尝试以下操作：

java -cp .:frege3.jar Hello

假设

frege3.jar

和

Hello.class

都在当前目录中

您不需要额外的javac编译，这是由frege编译器自动完成的（除非被标志抑制）

是的，这里有一个入门文档：

---

@Nicholas Filotto也有同样的想法，但我使用了“java-cp.../frege3.jar Hello”。谢谢这就是为什么我加了一条“假设…”

java -cp .:frege3.jar Hello