error trying to exec 'ecj1': execvp: No such file or directory

Hi,

I am trying to port gcj to RTEMS now and have got boehm-gc, libffi,
libjava compiled for RTEMS. But when I try to use i386-rtems-gcj to
compile HelloWorld for RTEMS after install, I got "error trying to
exec 'ecj1': execvp: No such file or directory" and don't know how to
fix it. Could somebody give me an help hand or an advice ? Very
Thanks.

The error information can be seen below:
i386-rtems-gcj -v --main=HelloWorld HelloWorld.java -o Hello
Using built-in specs.
Reading specs from /mnt/gcj/mytoolchain/lib/gcc/i386-rtems/4.7.0/libgcj.spec
rename spec startfile to startfileorig
rename spec lib to liborig
COLLECT_GCC=i386-rtems-gcj
COLLECT_LTO_WRAPPER=/mnt/gcj/mytoolchain/libexec/gcc/i386-rtems/4.7.0/lto-wrapper
Target: i386-rtems
Configured with: ../gcc-trunk/configure --enable-threads=rtems
--with-gnu-as --enable-multilib --enable-newlib-mb
--enable-newlib-iconv --with-gnu-ld --with-newlib --verbose
--with-system-zlib --disable-nls
--enable-version-specific-runtime-libs --enable-languages=c,c++,java
--target=i386-rtems --prefix=/mnt/gcj/mytoolchain/
--with-gmp=/mnt/gcj/gcj-rtems-work/gmpmpfrmpc
--with-mpfr=/mnt/gcj/gcj-rtems-work/gmpmpfrmpc
--with-mpc=/mnt/gcj/gcj-rtems-work/gmpmpfrmpc
Thread model: rtems
gcc version 4.7.0 20110409 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-fsaw-java-file' '-v' '-o' 'Hello'
'-fbootclasspath=./:/mnt/gcj/mytoolchain/share/java/libgcj-4.7.0.jar'
'-g1' '-mtune=i386' '-march=i386'
 ecj1 HelloWorld.java -g1
-fbootclasspath=./:/mnt/gcj/mytoolchain/share/java/libgcj-4.7.0.jar
-g1 -fsource=1.5 -ftarget=1.5 -fzip-dependency /tmp/ccuWIrFF.zip
-fzip-target /tmp/cc7in4l3.jar
i386-rtems-gcj: error trying to exec 'ecj1': execvp: No such file or directory
make: *** [Hello] Error 1

Best Regards,
Jie