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Grammatical Framework core: compiler, shell & runtimes
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Java API (Windows) - No Main entry point in jpgf.jar #151

Open UserBoi1 opened 1 year ago

UserBoi1 commented 1 year ago 
"C:\Program Files\Java\jdk1.8.0_261\bin\java.exe" -Dfile.encoding=windows-1252 -jar "C:\Users\Glen\Documents\Grammatical Framework (GF)\gf-3.11-windows\tmp-dist\java\jpgf.jar"
no main manifest attribute, in C:\Users\Glen\Documents\Grammatical Framework (GF)\gf-3.11-windows\tmp-dist\java\jpgf.jar

Process finished with exit code 1

I am using IntelliJ with the jfpg.jar added as a dependency to my project.

It's not just the MANIFEST.MF missing a mention of the entry point. I have searched through all the classes in jpgf.jar and none of them has a static void main(String[] args) in them.

I don't really know much about JARs, but from what I can google, it seems it has to have such an entry point. Is jpgf.jar a kind of non-executable JAR? What is it that I'm missing here?

Any help appreciated.

krangelov commented 1 year ago

Hi Glen,

The jar doesn't have to have a main function. Some jars do have it if they are meant to be executed as a standalone program. Instead jpgf.jar is a library that you call from your own program. You provide the main method yourself where you load the grammar by using the library.

Best Regards, Krasimir

On Wed, 1 Feb 2023 at 14:26, Glen B @.***> wrote:

"C:\Program Files\Java\jdk1.8.0_261\bin\java.exe" -Dfile.encoding=windows-1252 -jar "C:\Users\Glen\Documents\Grammatical Framework (GF)\gf-3.11-windows\tmp-dist\java\jpgf.jar" no main manifest attribute, in C:\Users\Glen\Documents\Grammatical Framework (GF)\gf-3.11-windows\tmp-dist\java\jpgf.jar

Process finished with exit code 1

I am using IntelliJ with the jfpg.jar added as a dependency to my project.

It's not just the MANIFEST.MF missing a mention of the entry point. I have searched through all the classes in jpgf.jar and none of them has a static void main(String[] args) in them.

I don't really know much about JARs, but from what I can google, it seems it has to have such an entry point. Is jpgf.jar a kind of non-executable JAR? What is it that I'm missing here?

Any help appreciated.

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krangelov commented 1 year ago

You are confusing the system path with the Java path. See here:

https://stackoverflow.com/questions/1734207/how-to-set-java-library-path-for-processing

On Thu, 2 Feb 2023 at 23:41, Glen B @.***> wrote:

Hi Krasimir,

Thanks for your response. As a result, I have been attempting to load it as a library.

I'm getting this:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no jpgf in java.library.path

My Windows user PATH includes: C:\Users\Glen\Documents\Grammatical Framework (GF)\gf-3.11-windows\tmp-dist And my jpgf.jar is at: C:\Users\Glen\Documents\Grammatical Framework (GF)\gf-3.11-windows\tmp-dist\java

Any ideas on what the issue could be?

Thanks,

Glen

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UserBoi1 commented 1 year ago

Hi Krasimir,

Thank you for your response. As a result, I applied -Djava.library.path=C:\Users\Glen\Documents\GrammaticalFramework\java and it got past the error!

Unfortunately, I am now getting a different error:

Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Users\Glen\Documents\GrammaticalFramework\java\jpgf.dll: Can't find dependent libraries
    at java.lang.ClassLoader$NativeLibrary.load(Native Method)
    at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1934)
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1850)
    at java.lang.Runtime.loadLibrary0(Runtime.java:871)
    at java.lang.System.loadLibrary(System.java:1122)
    at org.grammaticalframework.pgf.PGF.<clinit>(PGF.java:88)
    at Game.main(Game.java:20)

Process finished with exit code 1

I used dependency walker to find the DLLs it depends on:

I copied the two GF ones into the java folder and that seemed to make dependency walker happy. Kernel32 is fine. But it said msys2 was not fine. I have it on my machine, but under C:\msys64. I didn't know if it was a risky move to install it to System32 so I just copied the msys-2.0.dll in. Made no difference. Dependency walker still unhappy. Code still produces the same mysterious error. So I copied msys-2.0.dll into my C:\Users\Glen\Documents\GrammaticalFramework\java, seeing as that worked for the GF ones. Made no difference.

Any advice?

Many thanks, Glen

krangelov commented 1 year ago

It is hard to say when I don't know what Dependency Walker told you about msys. It has been a long time since I last compiled the Java binding on Windows, but in general I try to avoid compiling with the MSYS runtime. MSYS tries to do full Linux emulation which is usually not what you want. Did you compile the GF libraries yourself or did you get them from somewhere?

Now I don't remember what are the steps to compile with MinGW but maybe this will help:

https://stackoverflow.com/questions/60101673/learning-how-to-use-configure-make-with-mingw

On Sat, 4 Feb 2023 at 03:32, Glen B @.***> wrote:

Hi Krasimir,

Thank you for your response. As a result, I applied -Djava.library.path=C:\Users\Glen\Documents\GrammaticalFramework\java and it got past the error!

Unfortunately, I am now getting a different error:

Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Users\Glen\Documents\GrammaticalFramework\java\jpgf.dll: Can't find dependent libraries at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1934) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1850) at java.lang.Runtime.loadLibrary0(Runtime.java:871) at java.lang.System.loadLibrary(System.java:1122) at org.grammaticalframework.pgf.PGF.(PGF.java:88) at Game.main(Game.java:20)

Process finished with exit code 1

I used dependency walker to find the DLLs it depends on:

  • C:\Users\Glen\Documents\GrammaticalFramework\c\libpgf-0.dll
  • C:\Users\Glen\Documents\GrammaticalFramework\c\libgu-0.dll
  • C:\Windows\System32\Kernel32.dll
  • C:\Windows\System32\msys-2.0.dll

I copied the two GF ones into the java folder and that seemed to make dependency walker happy. Kernel32 is fine. But it said msys2 was not fine. I have it on my machine, but under C:\msys64. I didn't know if it was a risky move to install it to System32 so I just copied the msys-2.0.dll in. Made no difference. Dependency walker still unhappy. Code still produces the same mysterious error. So I copied msys-2.0.dll into my C:\Users\Glen\Documents\GrammaticalFramework\java, seeing as that worked for the GF ones. Made no difference.

Any advice?

Many thanks, Glen

— Reply to this email directly, view it on GitHub https://github.com/GrammaticalFramework/gf-core/issues/151#issuecomment-1416635432, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEYFSZH2VE4GMYP3L24NOL3WVW5VXANCNFSM6AAAAAAUNXFQNQ . You are receiving this because you commented.Message ID: @.***>

UserBoi1 commented 1 year ago

I downloaded the GF windows binaries from here: https://github.com/GrammaticalFramework/gf-core/releases/tag/3.11

I am looking into how I would compile it myself instead. I've cloned the GitHub repo and I'm looking in gf-core/src/runtime/java. The INSTALL file tells me I need to do C first. The INSTALL file for C says:

For Windows users
-----------------

- Install MinGW: http://www.mingw.org/. From the installer you need
  to select at least the following packages:
     - Mingw-developer-toolkit
     - Mingw-base
     - Msys-base
  After the installation, don't forget to fix the fstab file. See here:
     http://www.mingw.org/wiki/Getting_Started

- From the MSYS shell (c:/MinGW/msys/1.0/msys.bat) go to the directory
  which contains the INSTALL file and do:

  $ autoreconf -i
  $ ./configure
  $ make
  $ make install

  The compiled binaries should be now in c:/MinGW/msys/1.0/local/bin.

This is quite confusing for a few reasons. http://www.mingw.org/ is no longer a valid link. A quick Google reveals that it has been succeeded by a project called https://www.mingw-w64.org/. And it talks about both Mingw and Msys. You mentioned avoiding compiling with Msys so should I disregard these instructions?

krangelov commented 1 year ago

The whole process on Windows is confusing. I have to rediscover it everytime. MSYS is a set of Linux compatible tools. The result from the compilation is either an MSYS compatible binary or a native binary i.e. a one for MinGW. The difference is which C runtime is used msys.dll or msvcrt.dll.

I will change the web site in the instructions.

On Sat, 4 Feb 2023 at 17:51, Glen B @.***> wrote:

I downloaded the GF windows binaries from here: https://github.com/GrammaticalFramework/gf-core/releases/tag/3.11

I am looking into how I would compile it myself instead. I've cloned the GitHub repo and I'm looking in gf-core/src/runtime/java. The INSTALL file tells me I need to do C first. The INSTALL file for C says:

For Windows users

  • Install MinGW: http://www.mingw.org/. From the installer you need to select at least the following packages:

  • From the MSYS shell (c:/MinGW/msys/1.0/msys.bat) go to the directory which contains the INSTALL file and do:

    $ autoreconf -i $ ./configure $ make $ make install

    The compiled binaries should be now in c:/MinGW/msys/1.0/local/bin.

This is quite confusing for a few reasons. http://www.mingw.org/ is no longer a valid link. A quick Google reveals that it has been succeeded by a project called https://www.mingw-w64.org/. And it talks about both Mingw and Msys. You mentioned avoiding compiling with Msys so should I disregard these instructions?

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