[java]gcjが動かない

もしかすると、JDKを使っているからだめなのか？
cygwinだから、gcjを使うといいんではなかろうか。

public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } }

$ gcj --main=HelloWorld -O HelloWorld.java
Exception in thread "main" java.lang.NoClassDefFoundError: org.eclipse.jdt.internal.compiler.batch.GCCMain
   at gnu.java.lang.MainThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jdt.internal.compiler.batch.GCCMain not found in gnu.gcj.runtime.SystemClassLoader{urls=[], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
   at java.net.URLClassLoader.findClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at java.lang.ClassLoader.loadClass(Unknown Source)
   at gnu.java.lang.MainThread.run(Unknown Source)

だめだねぇ。

$ gcj --version
gcj (GCC) 4.3.4 20090804 (release) 1
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cygcheck -c | grep gcj
libgcj-common        4.3.4-4                 OK
libgcj9              4.3.4-4                 OK

よくわからん。