<p>I recompiled the module forcing the header path in the sources (the version matches since the source is the orig from which debian builds the package):<br>
#include "/usr/lib/jvm/java-11-openjdk-amd64/include/jni.h"</p>
<p>now the error changed:<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: WARNING: dispatcher [dispatch.c:1007]: ds_load_db(): no dispatching data in the db -- empty destination set<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO: pike [pike.c:97]: pike_init(): PIKE - initializing<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO: pike [ip_tree.c:81]: init_lock_set(): probing 256 set size<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO: app_java [app_java_mod.c:131]: mod_init(): Initializing Java VM with options: -Djava.compiler=/usr/lib/jvm/java-11-openjdk-amd64/bin/javac -Djava.class.path=/usr/lib/x86_64-linux-gnu/kamailio/java/:/usr/lib/x86_64-linux-gnu/kamailio/java/:/usr/lib/x86_64-linux-gnu/kamailio/java/kamailio.jar  -verbose:gc,jni<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO: app_java [app_java_mod.c:150]: mod_init(): app_java: Java VM initialization OK<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO: app_java [app_java_mod.c:199]: mod_init(): app_java: module initialization OK<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO: cfgutils [cfgutils.c:831]: mod_init(): no hash_file given, disable hash functionality<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: INFO:  [main.c:2648]: main(): processes (at least): 20 - shm size: 134217728 - pkg size: 134217728<br>
May 31 09:55:04 PROXY-TEST-01 /usr/sbin/kamailio[6191]: CRITICAL:  [core/mem/q_malloc.c:144]: qm_debug_check_frag(): BUG: qm: prev. fragm. tail overwritten(5558198d1830, abcdefed)[0x7feaa938ecb0:0x7feaa938ece8]! Memory allocator was called from xlog: xlog.c:498. Fragment marked by core: db_res.c:88. Exec from core/mem/q_malloc.c:384.<br>
May 31 09:55:05 PROXY-TEST-01 kamailio: ERROR:  [core/daemonize.c:303]: daemonize(): Main process exited before writing to pipe</p>
<p>it occurs only when app_java.so is loaded</p>

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