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From:	Philipp Kraus <philipp DOT kraus AT flashpixx DOT de>
Subject:	Re: gcj exception compiling
Date:	Sun, 6 Nov 2011 21:16:00 +0100
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On 2011-11-06 02:28:12 +0100, Yaakov (Cygwin/X) said:

> On Sat, 2011-11-05 at 19:13 +0100, Kraus Philipp wrote:
>> Hello,
>> 
>> I try to build a Java class with the gcj under Cygwin. I get this error 
>> message:
>> 
>> Exception in thread "main" java.lang.NoClassDefFoundError: 
>> org.eclipse.jdt.inter
>> nal.compiler.batch.GCCMain
>> at gnu.java.lang.MainThread.run(Unknown Source)
>> Caused by: java.lang.ClassNotFoundException: 
>> org.eclipse.jdt.internal.compiler.b
>> atch.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)
> 
> You're missing the ECJ jar.  Either download
> ftp://sourceware.org/pub/java/ecj-4.5.jar and install it
> to /usr/share/java/ecj.jar or install java-ecj from Cygwin Ports.

Thanks, but under /usr/sbin/ should be a script like download_ecj.sh
for downloading and installing, but in my Cygwin version the script
does not exists

> 
>> The class does not have any main function.
>> On the default gcj installation, it creates this error first:
>> 
>> /usr/lib/gcc/i686-pc-cygwin/4.5.3/ecj1.exe: error while loading shared 
>> libraries
>> : cyggcj-11.dll: cannot open shared object file: No such file or directory
>> 
>> So I install the gcj-11 library, the setup installs gcj-9 on default.
>> 
>> How can I create a working installation?
> 
> Install libgcj11.
> 
> (P.S. Dave Korn: I took the liberty of fixing this on sourceware.)

If I try to compile a java code with "gcj mysource.java" I get the error:

/usr/lib/gcc/i686-pc-cygwin/4.5.3/../../../libcygwin.a(libcmain.o):(.text+0xa9): 

 undefined reference to `_WinMain AT 16'
collect2: ld returned 1 exit status

How can I solve the linker problem? (I have installed the newest 
version of Cygwin)

Thanks
Phil



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