Failed to dynamically load library libglfw.so(error = null)

[pengsun]

Hi dear developers,

I cannot start FTG4.5/ftg.sh in a Debian system. Could you help take a look?

I ran the following command

java -cp FightingICE.jar:./lib/lwjgl/*:./lib/natives/linux/*:./lib/* -Dorg.lwjgl.util.Debug=true Main --py4j --mute --port 4242

and saw the outputs:

[LWJGL] Version: 3.1.2 build 29
[LWJGL]          OS: Linux v4.19.117.bsk.5-amd64
[LWJGL]         JRE: 1.8.0_292 amd64
[LWJGL]         JVM: OpenJDK 64-Bit Server VM v25.292-b10 by AdoptOpenJDK
[LWJGL] Loading library (system): lwjgl
[LWJGL]         Found at: /tmp/lwjgl{USER_NAME}/3.1.2-build-29/liblwjgl.so
[LWJGL]         Loaded from org.lwjgl.librarypath: /tmp/lwjgl{USER_NAME}/3.1.2-build-29/liblwjgl.so
[LWJGL] MemoryUtil accessor: MemoryAccessorUnsafe
[LWJGL] Warning: Failed to instantiate memory allocator: org.lwjgl.system.jemalloc.JEmallocAllocator. Using the system default.
[LWJGL] MemoryUtil allocator: StdlibAllocator
[LWJGL] Loading library: glfw
[LWJGL]         Found at: /tmp/lwjgl{USER_NAME}/3.1.2-build-29/libglfw.so
Exception in thread "main" java.lang.UnsatisfiedLinkError: Failed to dynamically load library: /tmp/lwjgl{USER_NAME}/3.1.2-build-29/libglfw.so(error = null)
        at org.lwjgl.system.linux.LinuxLibrary.<init>(LinuxLibrary.java:22)
        at org.lwjgl.system.APIUtil.apiCreateLibrary(APIUtil.java:105)
        at org.lwjgl.system.Library.loadNative(Library.java:322)
        at org.lwjgl.system.Library.loadNative(Library.java:307)
        at org.lwjgl.system.Library.loadNative(Library.java:234)
        at org.lwjgl.glfw.GLFW.<clinit>(GLFW.java:602)
        at sun.misc.Unsafe.ensureClassInitialized(Native Method)
        at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
        at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:156)
        at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1088)
        at java.lang.reflect.Field.getFieldAccessor(Field.java:1069)
        at java.lang.reflect.Field.getInt(Field.java:574)
        at org.lwjgl.system.APIUtil.apiClassTokens(APIUtil.java:259)
        at org.lwjgl.glfw.GLFWErrorCallback$1.<init>(GLFWErrorCallback.java:78)
        at org.lwjgl.glfw.GLFWErrorCallback.createPrint(GLFWErrorCallback.java:77)
        at manager.DisplayManager.initialize(DisplayManager.java:66)
        at manager.DisplayManager.start(DisplayManager.java:50)

But I was able to successfully start it on Mac or Ubuntu. No idea why it fails on this specific debian system.

Will appreciate if you could provide any help or clue.

[pengsun]

Solved by installing missing dependencies.

For those who may encounter the same issue, first identify the dependencies by the command:

ldd /tmp/lwjgl{USER_NAME}/3.1.2-build-29/libglfw.so

then install the missing libs. In our case, it involves:

apt-get install -y \
        libxcursor1 \
        libxrandr2 \
        libxinerama-dev \
        ...

You may also need install xvfb for headless mode, as is described in this issue #6 .