I have downloaded and used successfully the developer demo provided as part of the Zebr SDK. I'm able to print using direct usb connection from a Windows 10 PC to a Zebra ZD620 printer using the java demo application running on a jdk 1.8 runtime.
But when I try a version of java from 9 and over , the java runtime crashes. Here is what java reports:
# Java VM: OpenJDK 64-Bit Server VM (9+181, mixed mode, tiered, compressed oops, g1 gc, windows-amd64)
# Problematic frame:
# C [ZebraNativeUsbAdapter_64.dll+0x25be]
#
# No core dump will be written. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# D:\ivano\Met\EclipseWorkspace202109\DeveloperDemo_Desktop\hs_err_pid34584.log
#
# 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.
#
Does Zebra SDK supports JDK over 1.8?
ZebraNativeUsbAdapter_64.dll and jdk 9// Expert user has replied. |
5 Replies
The Java 1.8 is supported by the Link-OS SDK for PC Java. I have the Java v1.8.0_161 installed on my Windows 10 desktop and the ZebraNativeUsbAdapter_64.dll works just fine for me. Try uninstall and reinstall the Java v1.8 to see if the issue goes away.
[Update] I've another Windows 10 PC (64-Bit) with Java v13.0.2 installed. The Developer Demo that comes with the SDK release works just fine with the ZebraNativeUsbAdapter_64.dll. Though, I don't have a PC with Java v1.9, I am pretty certain that the ZebraNativeUsbAdapter_64.dll should work with Java v1.9 too.[Update] The above update was wrong so to cross it out. After further investigation, it was found that the ZebraNativeUsbAdapter_64.dll will cause various exceptions with the Java that is beyond the version v1.8.0_251. You are right that we cannot use the USB direct with the ZebraNativeUsbAdapter_64.dll in JDK 9 or beyond.
I have the same problem with JDK 64 bit and Zebra SDK on a ZXP3.
But the problem doesn't seem to be java 8 vs java 9 and above, it's more like 32 bit vs 64 bit.
By using a JDK 32-bit, the JVM does not crash and it is even possible to use recent JDKs (JDK 17 for example).
Hi,
I was running into the same issue and I've managed to patch the existing DLL so it works correctly under Java x64.
Here are the patch details: https://github.com/7c5eea120b/zxp-native-usb-adapter-64bit-hack
Please note this is an unofficial community patch. If it still doesn't work, you can submit an issue on GitHub and I will look at it :)
Thank you for providing the patch.
I tested it with JDK 1 7 (64 bits), and it seems to be working well.
However, I encountered a crash this time, and I suspect it might be related to the Close method now.
We hope that Zebra will provide a more stable DLL soon.
Hello Vincent,
In general, the most popular issue might be that the crash occurs when Close() is called twice on the same printer handle. That would indicate a programming bug somewhere on the Java side (either in the SDK library itself or within the custom code).
Can you post the crash log in the repository's GitHub Issues or here? I'm curious to review what the problem is. Are you using the most recent version of the patch DLL? Also, does it happen after some time or pretty much immediately?