Im developing a Spring Boot Web Application, using SWI-Prolog's JPL interface to call Prolog from Java. In development mode everything runs OK. When I deploy it to Docker the first call on JPL through API, runs fine. When I try to call JPL again, JVM crashes.
I use LD_PRELOAD to point to libswipl.so
SWI_HOME_DIR is set also.
LD_LIBRARY_PATH is set to point to libjvm.so
My Controller function:
@PostMapping("/rules/testAPI/")
@Timed
public List<String> insertRule() {
String use_module_http = "use_module(library(http/http_open)).";
JPL.init();
Query q1 = new Query(use_module_http);
if (!q1.hasNext()) {
System.out.println("Failed to load HTTP Module");
} else {
System.out.println("Succeeded to load HTTP Module");
}
return null;
}
Console output
1st Call
Succeeded to load HTTP Module
2nd Call
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f31705294b2, pid=16, tid=0x00007f30d2eee700
#
# JRE version: OpenJDK Runtime Environment (8.0_191-b12) (build 1.8.0_191-8u191-b12-2ubuntu0.18.04.1-b12)
# Java VM: OpenJDK 64-Bit Server VM (25.191-b12 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C [libswipl.so+0xb34b2] PL_thread_attach_engine+0xe2
#
# Core dump written. Default location: //core or core.16
#
# 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.
#
I uploaded the error log file in pastebin. click here
Has anyone faced the same problem? Is there a solution about this?
Note that, I also checked it also with oracle-java-8 but the same error occurs.
UPDATE:
@CapelliC answer didn't work.
Finally it was a bug of JPL package. After contacting SWI-Prolog developers, they patched a fix to the SWI-Prolog Git and now the error is gone!
Right configuration, so that Docker container be able to understand JPL is found in this link: Github : env.sh