Subject Firebird embedded on Linux - success
Author Nikolay Ivanchev
Post date 2003-11-04T08:45:36Z
Early this morning I managed to run it finaly.
Here are the problems which I encounter
1. Compiling entrypoints.cpp -
method JNIEXPORT jbyteArray JNICALL Java_org_firebirdsql_ngds_GDS_1Impl_native_1isc_1blob_1info
There is a bug in line 937 -> char* resultBuffer = (char*)_alloca(jBufferLength);  <-
There is no such method. Since you can blame me in everything, except being C (C++)developer I simply changed this line to make the char* to some string (with my ego it was my name).
I suppose _alloca is in some .h file but ....
 
2. After compiling libjaybird.so is not linked to libfbembedded so when I tried to run sample app it returned to me:
 
root@localhost firebird2]# Exception in thread "main" java.lang.UnsatisfiedLinkError: /opt//jdk1.4/jre/lib/i386/libjaybird.so: /opt/jdk1.4/jre/lib/i386/libjaybird.so: undefined symbol: _ZTVN10__cxxabiv117__class_type_infoE
 at java.lang.ClassLoader$NativeLibrary.load(Native Method)
 at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1473)
 at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1389)
 at java.lang.Runtime.loadLibrary0(Runtime.java:788)
 at java.lang.System.loadLibrary(System.java:832)
 at org.firebirdsql.ngds.GDS_Impl.<init>(GDS_Impl.java:53)
 
 
When i ldd-ed the libjaybird.so I saw this
[root@localhost libr]# ldd -r /usr/lib/libjaybird.so
        libdl.so.2 => /lib/libdl.so.2 (0x40037000)
        libc.so.6 => /lib/i686/libc.so.6 (0x42000000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
undefined symbol: _ZTVN10__cxxabiv117__class_type_infoE (/usr/lib/libjaybird.so)
undefined symbol: __gxx_personality_v0  (/usr/lib/libjaybird.so)
undefined symbol: _ZTISt9bad_alloc      (/usr/lib/libjaybird.so)
undefined symbol: _Znaj (/usr/lib/libjaybird.so)
undefined symbol: _ZdlPv        (/usr/lib/libjaybird.so)
undefined symbol: __cxa_end_catch       (/usr/lib/libjaybird.so)
undefined symbol: _Unwind_Resume        (/usr/lib/libjaybird.so)
undefined symbol: __cxa_throw   (/usr/lib/libjaybird.so)
undefined symbol: _ZdaPv        (/usr/lib/libjaybird.so)
undefined symbol: __cxa_begin_catch     (/usr/lib/libjaybird.so)
undefined symbol: __cxa_allocate_exception      (/usr/lib/libjaybird.so)
 
I searched for those symbols and I found them in libfbembedded.so
 
At this point the final solution was simple (coping libfbembedded.so to libfbclient.so)
LD_PRELOAD libfbcliend.so java -cp <my_classes> <main_method>
 
Everything wokrs just fine on my apps and tests excpet BLOBLS ofcourse :)
Actually i modified java.library.path (well this time using path.seprator instead of ";")
The problem is that I played with LD_LIBRARY_PATH and java.library.path but it was 5am in the morning, so I am not 100% sure which solutuon works, however I am 95% sure that java.library.path is the right one.
 
So I have several questions now:
LD_PRELOAD is not suitable for running embedded firebird with java course IDE's refuse to start. I know I can use type4 drivers for development, but I really like to develop in enviroment much closer to real situation.
 
Since libjaybird is wrapper to libfbembedded why not link to it?
 
Yesterday I had a nasty problem with fbembedded on Windows. MSVC60 Depends tool shows that fbembedded (fbclient) depends only on msvcrt.dll but when I deployed the app on tests machines which does not have any additional software installed I saw that msvcp60.dll is required also (which was a difficult to trace problem, my first instalation was on win9x machine, which threw an exception, win2k machine pop-uped a screen which informed me about missed dll but 2 hours later... :(
I added /D_STATIC_CPPLIB as a compiler directive but didn't helped. How can work out this situatuon?
 
Can some one fix the bug in entrypoints.cpp so I can test against BLOB's?
Can some one guide me a little with JUnit tetst for firebird so I can rework them to run against embedded firebird. I suppose linking to fbclient will be required. (well I bought used copy of Java tools for extreme programming, so in a week or so I will learn log4j, ant and JUnit).
What else can I do to help?
 
Regards,
Nikolay Ivanchev