Cannot open (null)/lib/libjawt.dylib

[mipastgt]

I tried the latest Liberica NIK according to this announcement:
https://bell-sw.com/announcements/2022/08/05/liberica-native-image-kit-22-2-0-and-21-3-3-builds-are-out/

I installed the software on macOS 12.5 and verified that the given SwingSet2 demo worked like advertised.

Then I tried to do exactly the same with an application of my own which is a Jetbrains Compose desktop app but Compose also uses AWT for the windowing, so this should work. Building the software works like before without any error but when I try to run my application I only get this:

Cannot open (null)/lib/libjawt.dylib: dlopen((null)/lib/libjawt.dylib, 0x0009): tried: '(null)/lib/libjawt.dylib' (no such file)

It seems as if some path element is undefined (null) but I have no clue why. If there is no obvious solution to this problem and you are willing to have a look at it I could provide the full demo project and all build steps to reproduce the problem.

[voitylov]

Hi Michael!

Could you provide the means to reproduce this issue?

[mipastgt]

The project can be found here: https://github.com/mipastgt/JavaForumStuttgartTalk2022/tree/main/PolySpiralMpp
./gradlew packageUberJarForCurrentOS should create the executable jar file in PolySpiralMpp/build/compose/jars/PolySpiral-macos-x64-1.0.0.jar
The step by step build commands can be found here:
commands.txt
and the build log is here:
build.txt

Thanks for looking into this!

[mipastgt]

If this upload works you can skip building the project and just use the jar here:
PolySpiral-macos-x64-1.0.0.jar.zip

[petermz]

Hi Michael, thank you for reporting this. We'll take a look

[AlexanderScherbatiy]

The "Cannot open (null)/lib/libjawt.dylib: dlopen((null)/lib/libjawt.dylib" exception is reported by https://github.com/JetBrains/skiko library.

It uses "java.home" to create a path to jawt lib and dlopen to dynamically access native JAWT_GetAWT method:
https://github.com/JetBrains/skiko/blob/c08102bbf9742c920c4ce6e90bffc09c5a202772/skiko/src/jvmMain/cpp/common/jawt.cc#L81

I checked the way where JAWT_GetAWT is called directly from Skiko_GetAWT method (Toolkit.getDefaultToolkit() is called before from java to initialize awt stuff):

extern "C" jboolean Skiko_GetAWT(JNIEnv *env, JAWT *awt) {
    return JAWT_GetAWT(env, awt);
}

and add jawt dependency to skiko shared lib:

diff --git a/skiko/build.gradle.kts b/skiko/build.gradle.kts
index 2bbfbeca..646c5c56 100644
--- a/skiko/build.gradle.kts
+++ b/skiko/build.gradle.kts
@@ -912,6 +912,8 @@ fun createLinkJvmBindings(
                     "-lGL",
                     "-lX11",
                     "-lfontconfig",
+                    "-ljawt",
+                    "-L$jdkHome/lib",

It works when I run SkiaAwtSample with java on my Linux desktop (should work on MacOS as well, though the path to lib may need to be updated on Windows).

But running a native image for SkiaAwtSample with these changes fails with exception that System.load("skiko-...") method from Library.loadLibraryOrCopy() method is unable to load skiko library because it depends on jawt.

https://github.com/JetBrains/skiko/blob/c08102bbf9742c920c4ce6e90bffc09c5a202772/skiko/src/jvmMain/kotlin/org/jetbrains/skiko/Library.kt#L20

./skiaawtsample.appkt 
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: Can't load library: /home/user/.skiko/572ee76a5b715a182f9f0974c6e1cf705133b076e707a5fc9c73bc16990fa6a9/libskiko-linux-x64.so
	at com.oracle.svm.core.jdk.NativeLibrarySupport.loadLibraryAbsolute(NativeLibrarySupport.java:104)
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:125)
	at java.lang.Runtime.load0(Runtime.java:768)
	at java.lang.System.load(System.java:1837)
	at org.jetbrains.skiko.Library.loadLibraryOrCopy(Library.kt:20)
	at org.jetbrains.skiko.Library.findAndLoad(Library.kt:117)
	at org.jetbrains.skiko.Library.load(Library.kt:63)

ldd ~/.skiko/572ee76a5b715a182f9f0974c6e1cf705133b076e707a5fc9c73bc16990fa6a9/libskiko-linux-x64.so 
	linux-vdso.so.1 (0x00007ffdcbbfd000)
	libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f244b23a000)
	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f244b0fd000)
	libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f244b0b6000)
	libjawt.so => not found
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f244af67000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f244ad75000)

I will try to look the other ways which could help to properly use JAWT_GetAWT native method with GraalVM in skiko library.

[AlexanderScherbatiy]

The solution to use JAWT_GetAWT native method with GraalVM could be linking the skiko library with static jawt lib.
I checked it only with test example on my Linux desktop.

Example:
JAWTExample.java

public class JAWTExample {

    static {
        System.loadLibrary("JAWTExample");
    }

    public static void main(String[] args) {
        long jawt = getJAWT();
        System.out.printf("jawt: %d%n", jawt);

    }

    private static native long getJAWT();
}

JAWTExample.c

#include <jni.h>
#include <jawt_md.h>

#include "JAWTExample.h"

/*
 * Class:     JAWTExample
 * Method:    getJAWT
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_JAWTExample_getJAWT(JNIEnv *env, jclass cls) {

    printf("[native] call getJAWT\n");

    JAWT *awt = new JAWT();
    awt->version = (jint)JAWT_VERSION_9;
    jboolean result = JAWT_GetAWT(env, awt);

    return (result == JNI_TRUE) ? (jlong) awt : 0;
}

Link static jawt library:

$GRAALVM/bin/javac -h . JAWTExample.java
g++ -g -shared -fPIC -I$GRAALVM/include -I$GRAALVM/include/linux -I. JAWTExample.c -o libJAWTExample.so -l:libjawt.a -l:libawt_xawt.a -l:libawt.a -L$GRAALVM/lib

The libJAWTExample.so does not have dependencies to jawt lib:

ldd libJAWTExample.so 
	linux-vdso.so.1 (0x00007fff621ec000)
	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fbd0887f000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fbd08730000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbd0853e000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fbd08ae2000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fbd08523000)

JAWT_GetAWT symbol is included into the JAWTExample shared library:

nm -D libJAWTExample.so | grep JAWT_GetAWT
000000000000d210 T JAWT_GetAWT

Make a native image:

$GRAALVM/bin/native-image -classpath . -Djava.library.path=. JAWTExample

To run the native image it needs to pass -Djava.library.path=. parameter:

./jawtexample  -Djava.library.path=.
[native] call getJAWT
jawt: 93859320197264

I believe it should work for skiko library as well.

[AlexanderScherbatiy]

I created a request to update skiko lib so it would be possible to use it with GraalVM. JetBrains/skiko#580

[mipastgt]

Thanks. I subscribed to the new issue too. Let's see what happens.