Created attachment 164850 [details]
Crash log from Kubuntu

The NetBeans IDE crashes several times per day, usually while I am typing or bringing up the code completion. 

I cannot force reproduce it, but has had 5 crashes today.  This happens with NetBeans 8.2, I did not experience this in NetBeans 8.1.

The result is a complete crash of the NetBeans IDE and loss of all unsaved data.

System information:

Running Kubuntu 17.04.

Product Version: NetBeans IDE 8.2 (Build 201705191307)
Updates: NetBeans IDE is updated to version NetBeans 8.2 Patch 2
Java: 1.8.0_131; OpenJDK 64-Bit Server VM 25.131-b11
Runtime: OpenJDK Runtime Environment 1.8.0_131-8u131-b11-0ubuntu1.17.04.1-b11
System: Linux version 4.10.0-28-generic running on amd64; UTF-8; en_US (nb)
User directory: /home/fredrik/.netbeans/8.2
Cache directory: /home/fredrik/.cache/netbeans/8.2

This is an extract from /var/log/apport.log, the full file (with all 5 crashes) attached:

ERROR: apport (pid 3930) Fri Jul 28 09:15:03 2017: called for pid 3023, signal 6, core limit 0
ERROR: apport (pid 3930) Fri Jul 28 09:15:03 2017: executable: /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java (command line "/usr/lib/jvm/default-java/bin/java -Djdk.home=/usr/lib/jvm/default-java -classpath /home/fredrik/.netbeans/8.2/lib/jfluid-server-15.jar:/home/fredrik/.netbeans/8.2/lib/jfluid-server-cvm.jar:/home/fredrik/.netbeans/8.2/lib/jfluid-server.jar:/home/fredrik/.netbeans/8.2/lib/locale/jfluid-server_ja.jar:/home/fredrik/.netbeans/8.2/lib/locale/jfluid-server_pt_BR.jar:/home/fredrik/.netbeans/8.2/lib/locale/jfluid-server_ru.jar:/home/fredrik/.netbeans/8.2/lib/locale/jfluid-server_zh_CN.jar:/usr/local/netbeans-8.2/platform/lib/boot.jar:/usr/local/netbeans-8.2/platform/lib/org-openide-modules.jar:/usr/local/netbeans-8.2/platform/lib/org-openide-util.jar:/usr/local/netbeans-8.2/platform/lib/org-openide-util-lookup.jar:/usr/local/netbeans-8.2/platform/lib/org-openide-util-ui.jar:/usr/local/netbeans-8.2/platform/lib/locale/boot_ja.jar:/usr/local/netbeans-8.2/platform/lib/locale/boot_pt_BR.jar:/usr/local/netbeans-8.2/platform/lib/locale/boot_ru.jar:/usr/local/netbeans-8.2/platform/lib/locale/boot_zh_CN.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-modules_ja.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-modules_pt_BR.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-modules_ru.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-modules_zh_CN.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util_ja.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-lookup_ja.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-lookup_pt_BR.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-lookup_ru.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-lookup_zh_CN.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util_pt_BR.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util_ru.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-ui_ja.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-ui_pt_BR.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-ui_ru.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util-ui_zh_CN.jar:/usr/local/netbeans-8.2/platform/lib/locale/org-openide-util_zh_CN.jar:/usr/lib/jvm/default-java/lib/dt.jar:/usr/lib/jvm/default-java/lib/tools.jar -Dnetbeans.default_userdir_root=/home/fredrik/.netbeans -Dnetbeans.running.environment=kde -Dnetbeans.dirs=/usr/local/netbeans-8.2/nb:/usr/local/netbeans-8.2/ergonomics:/usr/local/netbeans-8.2/ide:/usr/local/netbeans-8.2/extide:/usr/local/netbeans-8.2/java:/usr/local/netbeans-8.2/apisupport:/usr/local/netbeans-8.2/webcommon:/usr/local/netbeans-8.2/websvccommon:/usr/local/netbeans-8.2/enterprise:/usr/local/netbeans-8.2/mobility:/usr/local/netbeans-8.2/profiler:/usr/local/netbeans-8.2/python:/usr/local/netbeans-8.2/php:/usr/local/netbeans-8.2/identity:/usr/local/netbeans-8.2/harness:/usr/local/netbeans-8.2/cnd:/usr/local/netbeans-8.2/cndext:/usr/local/netbeans-8.2/dlight:/usr/local/netbeans-8.2/groovy:/usr/local/netbeans-8.2/extra:/usr/local/netbeans-8.2/javacard:/usr/local/netbeans-8.2/javafx: -Dnetbeans.home=/usr/local/netbeans-8.2/platform -Dnetbeans.importclass=org.netbeans.upgrade.AutoUpgrade -Dnetbeans.accept_license_class=org.netbeans.license.AcceptLicense -Xmx789m -client -Xss2m -Xms32m -Dapple.laf.useScreenMenuBar=true -Dapple.awt.graphics.UseQuartz=true -Dsun.java2d.noddraw=true -Dsun.java2d.dpiaware=true -Dsun.zip.disableMemoryMapping=true -DaddExports:java.desktop/sun.awt=ALL-UNNAMED -DaddExports:java.base/jdk.internal.jrtfs=ALL-UNNAMED -DaddExports:java.desktop/java.awt.peer=ALL-UNNAMED -DaddExports:java.desktop/com.sun.beans.editors=ALL-UNNAMED -DaddExports:java.desktop/sun.awt.im=ALL-UNNAMED -DaddExports:java.desktop/com.sun.java.swing.plaf.gtk=ALL-UNNAMED -DaddExports:java.management/sun.management=ALL-UNNAMED -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/home/fredrik/.netbeans/8.2/var/log/heapdump.hprof -splash:/home/fredrik/.cache/netbeans/8.2/splash.png org.netbeans.Main --cachedir /home/fredrik/.cache/netbeans/8.2 --userdir /home/fredrik/.netbeans/8.2 --branding nb")
ERROR: apport (pid 3930) Fri Jul 28 09:15:03 2017: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 3930) Fri Jul 28 09:15:03 2017: debug: session gdbus call:
ERROR: apport (pid 3930) Fri Jul 28 09:16:43 2017: core dump exceeded 710 MiB, dropped from /var/crash/_usr_lib_jvm_java-8-openjdk-amd64_jre_bin_java.1000.crash to avoid memory overflow
ERROR: apport (pid 3930) Fri Jul 28 09:16:43 2017: wrote report /var/crash/_usr_lib_jvm_java-8-openjdk-amd64_jre_bin_java.1000.crash