Gcc won't compile hello world

Hello World :
#include<iostream>
using namespace std;
int main ()
cout << "what am I doing wrong?";
return 0;
All the strace sh!t
execve("/usr/bin/gcc", ["gcc", "hello.cpp"], [/* 43 vars */]) = 0
uname({sys="Linux", node="stryder", ...}) = 0
brk(0) = 0x805d000
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f59000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=65638, ...}) = 0
mmap2(NULL, 65638, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f48000
close(3) = 0
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, "177ELF111331220R1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1363203, ...}) = 0
mmap2(NULL, 1150540, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7e2f000
mmap2(0xb7f3e000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10f) = 0xb7f3e000
mmap2(0xb7f46000, 7756, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f46000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7e2e000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e2e6c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7f48000, 65638) = 0
brk(0) = 0x805d000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=38399616, ...}) = 0
mmap2(NULL, 2097152, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7c2e000
close(3) = 0
brk(0x807e000) = 0x807e000
rt_sigaction(SIGINT, {SIG_IGN}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {0x804ade0, [INT], SA_RESTART}, {SIG_IGN}, 8) = 0
rt_sigaction(SIGHUP, {SIG_IGN}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGHUP, {0x804ade0, [HUP], SA_RESTART}, {SIG_IGN}, 8) = 0
rt_sigaction(SIGTERM, {SIG_IGN}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTERM, {0x804ade0, [TERM], SA_RESTART}, {SIG_IGN}, 8) = 0
rt_sigaction(SIGPIPE, {SIG_IGN}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGPIPE, {0x804ade0, [PIPE], SA_RESTART}, {SIG_IGN}, 8) = 0
rt_sigaction(SIGCHLD, {SIG_DFL}, {SIG_DFL}, 8) = 0
access("/bin/gcc", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/bin/gcc", X_OK) = 0
lstat64("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("/usr/bin", {st_mode=S_IFDIR|0755, st_size=20480, ...}) = 0
lstat64("/usr/bin/gcc", {st_mode=S_IFREG|0755, st_size=85296, ...}) = 0
access("/bin/gcc", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/bin/gcc", X_OK) = 0
lstat64("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("/usr/bin", {st_mode=S_IFDIR|0755, st_size=20480, ...}) = 0
lstat64("/usr/bin/gcc", {st_mode=S_IFREG|0755, st_size=85296, ...}) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/", X_OK) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/", X_OK) = 0
access("hello.cpp", F_OK) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/specs", R_OK) = 0
open("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/specs", O_RDONLY) = 3
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/specs", {st_mode=S_IFREG|0644, st_size=3869, ...}) = 0
read(3, "*asm:n%{v:-V} %{Qy:} %{!Qn:-Qy} "..., 3869) = 3869
close(3) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/specs", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/", X_OK) = 0
access("/tmp", R_OK|W_OK|X_OK) = 0
gettimeofday({1121809872, 830804}, NULL) = 0
getpid()
open("/tmp/ccTAp7N8.s", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
close(3) = 0
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/cc1plus", {st_mode=S_IFREG|0755, st_size=9274676, ...}) = 0
access("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/cc1plus", X_OK) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7e2e708) = 7198
waitpid(7198, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0) = 7198
--- SIGCHLD (Child exited) @ 0 (0) ---
gettimeofday({1121809873, 223825}, NULL) = 0
open("/tmp/ccLSz9Bn.o", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
close(3) = 0
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/bin/i686-pc-linux-gnu/3.4.3/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/bin/as", 0xbfc6c28c) = -1 ENOENT (No such file or directory)
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7e2e708) = 7199
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(7199, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0) = 7199
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/collect2", {st_mode=S_IFREG|0755, st_size=127724, ...}) = 0
access("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/collect2", X_OK) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crt1.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crt1.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/i686-pc-linux-gnu/3.4.3/crt1.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/crt1.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../i686-pc-linux-gnu/3.4.3/crt1.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../crt1.o", R_OK) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crti.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crti.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/i686-pc-linux-gnu/3.4.3/crti.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/crti.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../i686-pc-linux-gnu/3.4.3/crti.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../crti.o", R_OK) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crtbegin.o", R_OK) = 0
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/.", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/.", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/i686-pc-linux-gnu/3.4.3/.", 0xbfc6b33c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/.", 0xbfc6b35c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../i686-pc-linux-gnu/3.4.3/.", 0xbfc6b35c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../.", {st_mode=S_IFDIR|0755, st_size=36864, ...}) = 0
stat64("/lib/i686-pc-linux-gnu/3.4.3/.", 0xbfc6b38c) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/i686-pc-linux-gnu/3.4.3/.", 0xbfc6b37c) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crtend.o", R_OK) = 0
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crtn.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/crtn.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/i686-pc-linux-gnu/3.4.3/crtn.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/lib/crtn.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../i686-pc-linux-gnu/3.4.3/crtn.o", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../crtn.o", R_OK) = 0
stat64("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/collect2", {st_mode=S_IFREG|0755, st_size=127724, ...}) = 0
access("/usr/libexec/gcc/i686-pc-linux-gnu/3.4.3/collect2", X_OK) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7e2e708) = 7200
waitpid(7200, /tmp/ccLSz9Bn.o(.text+0xd): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const'
/tmp/ccLSz9Bn.o(.text+0x60): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccLSz9Bn.o(.text+0x9f): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccLSz9Bn.o(.text+0xce): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccLSz9Bn.o(.text+0x127): In function `main':
: undefined reference to `std::cout'
/tmp/ccLSz9Bn.o(.text+0x12c): In function `main':
: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/ccLSz9Bn.o(.text+0x155): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `std::ios_base::Init::Init()'
/tmp/ccLSz9Bn.o(.text+0x186): In function `__tcf_0':
: undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccLSz9Bn.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status
[{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0) = 7200
--- SIGCHLD (Child exited) @ 0 (0) ---
stat64("/tmp/ccLSz9Bn.o", {st_mode=S_IFREG|0600, st_size=2468, ...}) = 0
unlink("/tmp/ccLSz9Bn.o") = 0
stat64("/tmp/ccTAp7N8.s", {st_mode=S_IFREG|0600, st_size=6022, ...}) = 0
unlink("/tmp/ccTAp7N8.s") = 0
exit_group(1)
Any help would be appreciated immensly.

well, the compiler output would have been much more useful than an strace. The gnu compilers are used by millions of people - I'm pretty sure someone would have noticed if it didn't compile c++ programs. Following that logic, it's most likely a program error.
Also, like biio said, use g++ for c++ apps, instead of gcc - that'll probably fix your issue because it compiles fine here:
g++ hello.cpp -o hello

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iPhone SDK using Terminal tool, using the command line given in the xCode uninstall guide.
Installed the latest iPhone SDK (version 3.1), and then tried to compile the hello world app through xCode. Now I am getting the following error:
*error: can't exec '/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2' (No such file or directory*)
I had located the above mentioned directory and could not find the file: "gcc-4.2" as mentioned in the error. Instead
executable files like "i686-apple-darwin10-gcc-4.2.1" are present there.
My Project Settings are:
Project Format - xcode 3.2 -compatible
Base SDK - iPhone Simulator 3.1
Compiler Version - System Default (GCC 4.2)
I am totally confused here, as I don't know how to correctly set up the ENV, as I thought the iPhone installer SDK does that automatically.
Please help me out.
Thanks in advance for your time,
JC.
Error Messages:
Build helloworldxc of project helloworldxc with configuration Debug
ProcessPCH /var/folders/P-/P-zMg0EzHree36VYyqKEvU+TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/helloworldxcPrefix-gylsydenhucpkgfnujlgvzvhfhzd/helloworldxcPrefix.pch.gch helloworldxc_Prefix.pch normal i386 objective-c com.apple.compilers.gcc.4_2
cd "/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc"
setenv LANG en_US.US-ASCII
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr /bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -x objective-c-header -arch i386 -fmessage-length=0 -pipe -std=c99 -Wno-trigraphs -fpascal-strings -fasm-blocks -O0 -Wreturn-type -Wunused-variable -D_IPHONE_OS_VERSION_MINREQUIRED=30000 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1 .sdk -fvisibility=hidden -mmacosx-version-min=10.5 -gdwarf-2 -iquote /Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/helloworldxc.build/Deb ug-iphonesimulator/helloworldxc.build/helloworldxc-generated-files.hmap -I/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/helloworldxc.build/D ebug-iphonesimulator/helloworldxc.build/helloworldxc-own-target-headers.hmap -I/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/helloworldxc.build/D ebug-iphonesimulator/helloworldxc.build/helloworldxc-all-target-headers.hmap -iquote /Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/helloworldxc.build/Deb ug-iphonesimulator/helloworldxc.build/helloworldxc-project-headers.hmap -F/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/Debug-iphonesimulato r -I/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/Debug-iphonesimulato r/include -I/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/helloworldxc.build/D ebug-iphonesimulator/helloworldxc.build/DerivedSources/i386 -I/Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/build/helloworldxc.build/D ebug-iphonesimulator/helloworldxc.build/DerivedSources -c /Users/jaideepchakravorty/Jaideep/R&D/helloworldxc/helloworldxc_Prefix.pch -o /var/folders/P-/P-zMg0EzHree36VYyqKEvU+TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/helloworldxcPrefix-gylsydenhucpkgfnujlgvzvhfhzd/helloworldxcPrefix.pch.gch
while compiling hellowworldxc_Prefix.pch,
error: can't exec '/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2' (No such file or directory)

Could you let me know as where is the xcode setting through which it is looking for the compiler in the following path ? This path is probably wrong (Pls refer to the error messages)
I'm not sure this will be of any help to you -- I'm not sure if it's the answer you're looking for, since I don't really know enough on the subject. However, this may answer your question, or at least maybe help you find the answer for yourself, so it's worth a shot. Try going to Edit Project Settings in the Project menu, and once the Project Settings open, select the Build tab. Search through this and see if you find any preferences along the lines of what you are looking for. In particular I would try the sections toward the bottom about the GCC 4.0 compiler. Sorry if this was a waste of time, but I wanted to try...

How to compile a simple "Hello World" program in Java by using Netbeans

Hi all, I am very new to java programming arena. i am trying to learn the most demanding language for the time being. To program, i always use IDE's as it makes programming experience much easier by underline the syntax errors or sometimes showing codehint. However, I am facing some problem when i use Netbeabs to compile a simple "Hello world" program. my problem is whenever i write the code and press compile button, netbeans says "main class not found". Consequently,i am becoming frustated. So, i am here in this forum to get some kind help on How i can compile java programs in Netbeans. Please help me out, otherwise i may lose my enthusiasm in Java. please help me, i m stuck

Go to http://www.netbeans.org/
You should find tutorials there.

Problem with JNI hello world

I found some tutorial on SUN site on how to use JNI. I'm using Eclipse to compije Java and C (via Cygwin) files. Here are complete files:
Hello.java:
class Hello
     public native void sayHello();
     static
          try
          System.loadLibrary("hello");
          catch(Exception e)
               System.out.println("exc");
     public static void main(String[] args)
          Hello h = new Hello();
          h.sayHello ();
}Hello.c:
#include <mingw/_mingw.h> //because there are some types needed for JNI
#include <jni.h>
#include "Hello.h"
#include <stdio.h>
JNIEXPORT void JNICALL Java_Hello_sayHello
(JNIEnv *env, jobject obj)
     printf("Hello world!\n");
     return;
}Makefile:
hello.dll : Hello.o Hello.def
     gcc -g -shared -Wl,--kill-at -o hello.dll Hello.o hello.def
Hello.o : Hello.c Hello.h
     gcc -c -g -I"$(JAVA_HOME)\include" -I"$(JAVA_HOME)\include\win32" Hello.c -o Hello.o
Hello.h : Hello.class
     javah -jni Hello
clean :
     rm Hello.h
     rm Hello.o
     rm hello.dllHello.def
EXPORTS
Java_Hello_sayHelloEverything goes well, but when I run java program it does nothin (it should print message, but it just exit without any error).I'm sure that it's something stupid, but I cant see what. Can anyone tell me what am I doing wrong?
Thenks.

Answer 1: yes, there was no problem. I compiled and started simple 'hello world' program from Cygwin and from WinXP console, and it worked well.
Answer 2: This is weird, I changed code to this:
Hello.java:
     public native int getInt();
          System.out.println("Returned int is " + h.getInt());Hello.c:
JNIEXPORT jint JNICALL Java_Hello_getInt
(JNIEnv *env, jobject obj)
     return 25;
}It does not print anything. I started this program from Cygwin and from WinXP console, and from Eclipse. Only if I debug in Eclipse (step by step) I get:
Returned int is 25and still I don't get Hello string printed (even if I go step by step). It looks like cygwin has some problem with OS. Do you have any idea what to do, I'm a bit confused?
Thank you.
Message was edited by:
zly

Xcode Error won't compile any new projects!?

If you can help, please do. I have been having this problem for a whole day now and its really becoming a pain in the head.
Whenever I create a new project (Im working in C and Objective-C) even if don't write any code and just try and run the starter ("hello world") code it returns this error....
ld: file not found: /Developer/TomsXcode/build/Toms_Xcode.build/Debug/Toms_Xcode.build/Objects-normal/x86_64/TomsXcode.o
Command /Developer/usr/bin/gcc-4.2 failed with exit code 1
So far what I have done is;
Completely uninstalled Xcode and its Library's using the command line in Terminal
Installed the new version of Xcode (3.2.3)
Result: Error message is still there...
I have absolutely no clue what to do.
Thanks so much if you can help! :/

It looks like this problem was resolved (congratulations!) in your recent cross post, [Re: XCode Error -> Nothing will compile at all|http://discussions.apple.com/thread.jspa?messageID=12058548&#12058548]. Here are the instructions on closing a thread: [http://discussions.apple.com/help.jspa#answers].
\- Ray

JFrame "Hello World" hangs for no apparent reason...

Not completely new to Java, I decided to pick it up again after some years away from it. To my surprise I'm not able to run the most simple examples on my Ubuntu 7.10 using Eclipse as IDE.
Here's my jre
auditor@mymachine:~/workspace/hello/src$ java -version
java version "1.5.0"
gij (GNU libgcj) version 4.2.1 (Ubuntu 4.2.1-5ubuntu5)
and my compiler:
auditor@mymachine:~/workspace/hello/src$ javac -version
Eclipse Java Compiler v_774_R33x, 3.3.1, Copyright IBM Corp 2000, 2007. All rights reserved.
My program goes as:
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Dimension;
public class hello {
    private static void initMainWindow() {
        //Create and set up the window.
        JFrame frame = new JFrame("FrameDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel helloLabel = new JLabel("Hello world", JLabel.CENTER);
        helloLabel.setPreferredSize(new Dimension(175, 100));
        frame.getContentPane().add(helloLabel);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) throws
    ClassNotFoundException {
         //Opens main window
         javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                 initMainWindow();
}and it compiles fine - even no warnings. :) To my disbelief the program starts, but quite soon (2 sec's or so) it refuses to repaint after resize, and certainly won't close when I click the close icon.
When I run it from Eclipse, though, the program doesn't seem to hang as badly as first suspected. It behaves as if I ran it from a terminal, but I can terminate the execution without error from Eclipse. So there's still some connection with the program, it seems.
Any ideas what's going on?
Thanks!

Thanks for your reply, sabre150.
Following
http://ubuntuforums.org/showthread.php?t=201378
resolves the problem (in terminal), though I still can't force Eclipse to use this environment.

Cannot get a HELLO WORLD

Please take the time to answer this very simple but ANNOYING question.
does anybody know a good (preferably free) C compiler to build java compatable dll files??
The ones that are supposedly "the best out there, ect" seem to alway want to link dll's to exe's which defeats the whole point of a dll
Thanks in advance. Bamkin

Installation
Install the IDE; Sun's JDK with NetBeans for Java and Cygwin Unix shell for WinXXxx with GNU's gcc for C/C++ and Fortran
Install Netbeans with JDK as a co-bundle
Read More about J2SE http://java.sun.com/j2se/overview.html
Read More about NetBeansTM http://www.netbeans.org/
Download the Download NetBeans IDE v 3.5.1 with J2SE v 1.4.2 COBUNDLE
http://java.sun.com/j2se/1.4.2/download.html
For:
Windows (.exe)
Now install both at one step JDK and NetBeans
Install the Netbeans-Module "cpp"
This module adds the functionality of an C/C++ and Fortran editor with syntax-highlighting for view and print:
1) Open your NetBeans
Go with your browser to: http://www.netbeans.org/catalogue/32-stable.html
and select the download button for CPP support: http://www.netbeans.org/download/nbms/33/stable/Unmaintained/cpplite.nbm
If your NetBeans installation is valid you can open it direct with your browser for the NetBeans installation process.
Configure the syntax highlighting in Java and in ?cpp? as you like in font, color and font-settings.
For print:
at: Menue>Tools>Options/IDE Configuration/System/Print Settings/C and C++Editor>Font & Colors(click)>Button?...?(click)>Frame:?Print Fonts and Colors?
At this Frame you have a list of the recognized syntax-elements and on the right side you can change there styles in font, font-settings, colors and see a preview of the actual settings.
For java, XML and all other do the same in the ?Print Settings? as you like most.
For screen-view:
at: Menue>Tools>Options/Editing/Editor Settings/C and C++Editor>Font & Colors(click)>Button?...?(click)>Frame:?Fonts and Colors?
The frame works as that for print does.
Install Cygwin, the UNIX-Shell running in windows!
I will explain the way starting from web:
Go to:
http://www.cygwin.com/setup.exe
and start the setup.exe
You have to choose:
1) Install from Internet
2) your directory for cygwin like: "D:\Programme\cygwin" and the install for all or just for you
3) choose a local package directory like "D:\Programme\cygwin"
4) choose the settings to access the web like "Use IE5 Settings"
5) choose the nearest you download server
6) Selection of the required packages
The Developer Package:
A tree of packages is listed you have to click at 6. line (+Devel) at the word Default
+Devel # Default
Default should changed to:
+Devel # Install
...this is your developer-pack including gcc
The Win32-API libraries:
but further you have to go to Libs (line 12) and now click to the '+' -sign:
+ Libs # Default
The lib tree should now opened.
go up to the 5. last line at the 6. column "Package" you should read w32api: Win32 API header and library ...
look back to column 3 "New" there stands Skip click on it [as long] that you see the version number (2.5-1) or any better
The Documentation:
The Documentation should help but it is not necessary to install it:
+ Doc # Default (line 7)
so that it changes to
+ Doc # Install.
Now you can finish your installation!
Follow the steps to finish the installation.
Overview to JINI by a simple example
Java code using an external native dll function from java
This is the view of the resulting directory-file-structure
For all the steps sampleRoot stands for your root to work with this sample!
+- sampleRoot
   +- com
   | +- myPackage
   |     +HelloWorldCaller.java
   |     +HelloWorldCaller.class
   +HelloWoldImp.c
   +HelloWoldImp.dll
   +com_myPackage_HelloWorldCaller.h
The Java-code:
This code have a package-declaration so it resists at the subdirectories sampleRoot/com/myPackage!
package com.myPackage;
* HelloWorldCaller.java
* Created on 26. M?rz 2004, 13:23
* @author mike
class HelloWorldCaller {
    //the declaration for the native method
    public native void displayHelloWorld();
    //this part of code is executed while class is loaded
    static {
        //loads the native library from native systems path
        System.out.println("start to load the library");
        System.loadLibrary("HelloWorldImp");
        System.out.println("load should already be done");
    //the constructor is empty and can be cleared
    public HelloWorldCaller(){
    //this is a caller for the native method but you can do it direct at main
    public void doNativeCall(){
        displayHelloWorld();
    public static void main(String[] args) {
        //instantiate and call from this instance the native method
        new HelloWorldCaller().doNativeCall();
        //this is the same without a calling method between
        new HelloWorldCaller().displayHelloWorld();
Compile the Code:
You working-directory is the sampleRoot!
$ javac com/myPackage/HelloWorldCaller.java
Generate the C-Header File
You working-directory is the sampleRoot!
$ javah com.myPackage.HelloWorldCaller
The naming convention of the resulting header-file:
automatic generated by javah
Syntax of the C-header file name:
<packagename truncated with '_'>_<classname>.h
If you use no package this part ?<packagename truncated with '_'>_? is simply left.
+-- package name truncated with underscore
              +-- class name
                              + ending of a header filecom_myPackage_HelloWorldCaller.h
The naming convention of the resulting method declaration:
Syntax of the function signature:
Java_<packagename truncated with '_'>_<classname>_<functionname>
If you use no package this part ?<packagename truncated with '_'>_? is simply left.
+-- Java
    + Underscore
     +-- package name truncated with underscore
                   +-- class name
                                   +-- underscore
                                    +-- method nameJava_com_myPackage_HelloWorldCaller_displayHelloWorld
The generated - com_myPackage_HelloWorldCaller.h -file:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_myPackage_HelloWorldCaller */
#ifndef _Included_com_myPackage_HelloWorldCaller
#define _Included_com_myPackage_HelloWorldCaller
#ifdef __cplusplus
extern "C" {
#endif
* Class:     com_myPackage_HelloWorldCaller
* Method:    displayHelloWorld
* Signature: ()V
JNIEXPORT void JNICALL Java_com_myPackage_HelloWorldCaller_displayHelloWorld
(JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endif
The implementation of the native dll function - HelloWorldImp.c -file
* File:   HelloWorldImp.c
* Author: mike
* Created on 26. M?rz 2004, 14:34
#include <jni.h>
#include <stdio.h>
#include "com_myPackage_HelloWorldCaller.h"
/* The implementation of the native method
JNIEXPORT void JNICALL Java_com_myPackage_HelloWorldCaller_displayHelloWorld(JNIEnv *env, jobject obj)
    printf("Hello world!\n");
    return;
Compile the HelloWorldImp.c ? file to a *.dll
On MS Win with Cygwin, the following command builds a dynamic link library HelloWorldImp.dll:
This command is one line without line-breaks.
Check your include because I use the j2sdk1.4.2_04 if you want to do like me than install it.
For j2sdk1.4.2_04:
$ gcc -Wall -mno-cygwin -I/cygdrive/c/j2sdk1.4.2_04/include
-I/cygdrive/c/j2sdk1.4.2_04/include/win32 -shared
HelloWorldImp.c -Wl,--add-stdcall-alias -o HelloWorldImp.dllFor j2sdk1.4.2 as co-installation with NetBeans:
$ gcc -Wall -mno-cygwin -I/cygdrive/c/j2sdk1.4.2/j2sdk1.4.2/include
-I/cygdrive/c/j2sdk1.4.2/j2sdk1.4.2/include/win32 -shared
HelloWorldImp.c -Wl,--add-stdcall-alias -o HelloWorldImp.dll
The used Switches:
-Wall : switches on all warnings
-mno-cygwin : switches off the use of unix-API's, instead of it uses win32-calls
-I<directory> : defines a path to a directory with include *.h-files
-shared : advices the compiler to make shared libraries (*.so for linux and *.dll for win)
-Wl,<option> : Pass an option to the linker (for Wl: l is an L not an 1 and stands for linker)
-Wl,--add-stdcall-alias : pass the switch --add-stdcall-alias to the linker, advices the linker to add standardcalls so the exports have an standard-call alias as well.
The exports of the resulting dll:
If you want to test the exports yourself use : http://ftp.berlios.de/pub/unimatrix-fulda/win-devel/impdef.zip and compile it.
impdef.exe is a small program resulting the dll's EXPORTS to standard-device, screen:
$ impdef HelloWorldImp.dll
EXPORTS
Java_com_myPackage_HelloWorldCaller_displayHelloWorld
Java_com_myPackage_HelloWorldCaller_displayHelloWorld@8On Linux:
Not tested, only a sample copy from an other helping guy's text!
gcc -I../ -o libtestjni.so testjni.c ***many .a and .o here*** -shared -Wl,-soname,libnative.so
-I/usr/java/jdk/include -I/usr/java/jdk/include/linux -static -lc
On Solaris, the following command builds a shared library libhello.so:
Not tested, only a sample copy from an other helping guy's text!
cc -G -I/usr/local/java/include -I/usr/local/java/include/solaris \
HelloWorldImp.c -o libhello.so
On Microsoft Windows, the following command builds a dynamic link library hello.dll using Microsoft Visual C++ 4.0:
Not tested, only a sample copy from an other helping guy's text!
cl -Ic:\java\include -Ic:\java\include\win32
-LD HelloWorldImp.c -Fehello.dll
Set Your Library Path
DOS shell (Windows 95/NT)
On Windows 9x/NT/2000/(XP), the loadLibrary() method searches for DLLs in the same manner as other language environments do.
The java.library.path is the same as the systems %PATH%-variable.
Add the directory where your *.dll-file exists
SET PATH=%PATH%;X:YourDirectory
or copy your *.dll-file to one of the allready in the PATH mounted directories.
UNIX
% setenv LD_LIBRARY_PATH mylibrarypath
where mylibrarypath is the name of the directory that contains libhello.so.
MacOS
The Java runtime searches the JavaSoft Folder in the Extensions folder in the System Folder for shared libraries. Create an alias to your shared library in the JavaSoft Folder.
Execute the code
If it works fine:
$ java com.myPackage.HelloWorldCaller
start to load the library
load should already be done
Hello world!
If the dll is not found you get:
$ java com.myPackage.HelloWorldCaller
start to load the library
Exception in thread "main" java.lang.UnsatisfiedLinkError: no HelloWorldImp in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1491)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
at java.lang.System.loadLibrary(System.java:834)
at com.myPackage.HelloWorldCaller.<init>(HelloWorldCaller.java:24)
at com.myPackage.HelloWorldCaller.main(HelloWorldCaller.java:34)
The java.library.path is not as he should be see: ?Set Your Library Path?
If the dll is loaded, but the native method is not reachable you get something like:
$ java com.myPackage.HelloWorldCaller
Exception in thread "main" java.lang.UnsatisfiedLinkError: displayHelloWorld
at com.myPackage.HelloWorldCaller.displayHelloWorld(Native Method)
at com.myPackage.HelloWorldCaller.main(HelloWorldCaller.java:25)
Check the Naming of your native methods C-implementation and the generation of standard-calls.

Task Manager Process failing along w/ Hello World example

Hello Edwin,
Thank you very much for the word document on how to install Oracle BPEL into the oracle database. I was able to install according to your word document into my oracle 10g database. I have other problems though. When starting up the BPEL Process Manager, it gives me the following error message in the console:
java.lang.NoClassDefFoundError: org/apache/xerces/xni/XNIException
I guess this in turn leads to the TaskManager process failing as it has a yellow exclamation point next to it in the BPEL Console. The oc4j console window later displays this error message:
04/08/07 13:25:01 java.lang.ClassNotFoundException: bpel._1_0.TaskManager__BPEL4WS_BIN
Error while creating process.
An error has occurred while attempting to instantiate the class "bpel._1_0.TaskM
anager__BPEL4WS_BIN" for the process "TaskManager" (revision "1.0"). The exception reported was: bpel._1_0.TaskManager__BPEL4WS_BIN
Please try recompiling your BPEL process again. The current BPEL process archive "TaskManager" may have been compiled with an older version of "bpelc".
An error message similar to this occurs when I try and work through the "Hello World" tutorial. Any idea why these error messages are occuring? "classnotfound" exceptions tell me there is a classpath issue. Thanks for your help.
Kenny R.

Edwin,
Nevermind. I fixed it. I just copied the xercesImpl.jar file to the %ORABPEL_HOME%/system/appserver/oc4j/j2ee/home/applib directory and the processes function fine now. Thanks. Is this a bug that I found? Or was something messed up with my initial installation?

Gcc won't compile hello world

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