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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » Drag and Drop from SWT to embbedded AWT frame (SWT_AWT) is broken on Linux GTK 3.22 (DND from SWT to embbedded AWT frame (SWT_AWT) is broken on Linux, application crashes in few minutes)
Drag and Drop from SWT to embbedded AWT frame (SWT_AWT) is broken on Linux GTK 3.22 [message #1820652] Fri, 24 January 2020 15:11
Serhiy Davydiuk is currently offline Serhiy DavydiukFriend
Messages: 6
Registered: March 2016
Junior Member
Does anyone know the root cause of this issue? Or any workaround that can help?

Thanks!

RedHat 7.4
GTK 3.22
OpenJDK 11.0.2

Create an SWT control and implement a DragSource for it (using SWT API),
then create an embedded AWT frame and implement a DropTarget for AWT component (using AWT API).
Drag and drop from SWT to AWT is broken: the AWT DropTarget does not receive drop events all the time. There are a lot of error messages from GTK and application crashes in few minutes (5-10m)

There is a bug in Bugzilla
https://bugs.eclipse.org/bugs/show_bug.cgi?id=551303

It's broken on GTK3, on GTK2 works fine. Tested versions: SWT 4.6-4.13. Java 8, OpenJDK 11.

For testing used Eclipse's snippet
https://git.eclipse.org/c/platform/eclipse.platform.swt.git/tree/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet319.java

Crash log:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fe8f957ca03, pid=13753, tid=13754
#
# JRE version: OpenJDK Runtime Environment (11.0.2+9) (build 11.0.2+9)
# Java VM: OpenJDK 64-Bit Server VM (11.0.2+9, mixed mode, tiered, compressed oops, serial gc, linux-amd64)
# Problematic frame:
# C gtk_drag_finish+0x23
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e %P %I %h" (or dumping to /home/serhii/Workspace/Testing/core.13753)
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

--------------- S U M M A R Y ------------

Command Line: -Dfile.encoding=UTF-8 DnDTest

Host: Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz, 1 cores, 15G, CentOS Linux release 7.4.1708 (Core)
Time: Thu Sep 19 07:03:44 2019 EDT elapsed time: 326 seconds (0d 0h 5m 26s)

--------------- T H R E A D ---------------

Current thread (0x00007fe924010000): JavaThread "main"

Stack: , sp=0x00007fe92d5886e0, free space=1021k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
C gtk_drag_finish+0x23

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
J 658 org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(JZ)Z (0 bytes) @ 0x00007fe914759314
J 1052 c2 org.eclipse.swt.widgets.Display.readAndDispatch()Z (77 bytes) @ 0x00007fe91478038c [0x00007fe914780160+0x000000000000022c]
j DnDTest.main([Ljava/lang/String;)V+209
v ~StubRoutines::call_stub

siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr: 0x0000004000000003
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