HackRF not found by hackrf-spectrum-analyzer under Win11 ? JVMCFRE199E bad major version 55.0

[aneitzel]

Hello,

HackRF (with portapack, latest firmware 2023.01.1 installed), running fine under Win11 in SDR++ and other SDR tools. Unfortunately i dont got it managed to run with hackrf-spectrum-analyzer. It will always show "HackRF not connected" ???
I noticed a message during startup, details see below:

Exception in thread "hackrf_sweep" java.lang.UnsupportedClassVersionError: JVMCFRE199E bad major version 55.0 of class=hackrfsweep/HackrfSweepLibrary$hackrf_sweep_lib_start__fft_power_callback_callback, the maximum supported major version is 52.0; offset=6

Any idea whats wrong here?

---

HackRFinfo output:

hackrf_info version: 2023.01.1
libhackrf version: 2023.01.1 (0.8)
Found HackRF
Index: 0
Serial number: 0000000000000000f77c60dc261b78c3
Board ID Number: 2 (HackRF One)
Firmware Version: n_240430 (API:1.08)
Part ID Number: 0xa000cb3c 0x006a4358
Hardware Revision: older than r6
Hardware supported by installed firmware:
HackRF One

---

hackrf_sweep_spectrum_analyzer_windows.cmd

C:\Users\Username\Downloads\HackRF Spectrum Analyzer>java -Djna.platform.library.path=lib\win32-x86-64 -jar lib\hackrf_sweep_spectrum_analyzer.jar
Persistent image set to 320x240
HackRFSweep thread stopped.
Starting hackrf_sweep... 2400-2500MHz
hackrf_sweep params: freq 2400-2500MHz FFTBin 100000Hz samples 8192 lna: 40 vga: 0 antenna_lna: false
Exception in thread "hackrf_sweep" java.lang.UnsupportedClassVersionError: JVMCFRE199E bad major version 55.0 of class=hackrfsweep/HackrfSweepLibrary$hackrf_sweep_lib_start__fft_power_callback_callback, the maximum supported major version is 52.0; offset=6
at java.lang.ClassLoader.defineClassImpl(Native Method)
at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:397)
at java.lang.ClassLoader.defineClass(ClassLoader.java:358)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:682)
at java.net.URLClassLoader.access$400(URLClassLoader.java:89)
at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1086)
at java.security.AccessController.doPrivileged(AccessController.java:782)
at java.net.URLClassLoader.findClass(URLClassLoader.java:589)
at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:957)
at java.lang.ClassLoader.loadClass(ClassLoader.java:902)
at java.lang.ClassLoader.loadClass(ClassLoader.java:885)
at jspectrumanalyzer.HackRFSweepSpectrumAnalyzer.sweep(HackRFSweepSpectrumAnalyzer.java:1237)
at jspectrumanalyzer.HackRFSweepSpectrumAnalyzer.lambda$6(HackRFSweepSpectrumAnalyzer.java:774)
at java.lang.Thread.run(Thread.java:826)
Persistent image set to 401x401
Persistent image set to 401x401

[dave3825us]

Anything going on with this program? Wont connect to hackrf win 10

[aneitzel]

Good news! Found the problem!

The error JVMCFRE199E bad major version 55.0 comes up because of a old JAVA runtime engine installed on my system.
I uninstalled java and installed following open JAVA IBM Seremu implementation (its free):

openjdk 21.0.2 2024-01-16 LTS
IBM Semeru Runtime Open Edition 21.0.2.0 (build 21.0.2+13-LTS)
Eclipse OpenJ9 VM 21.0.2.0 (build openj9-0.43.0, JRE 21 Windows 11 amd64-64-Bit Compressed References 20240116_95 (JIT enabled, AOT enabled)
OpenJ9 - 2c3d78b48
OMR - ea8124dbc
JCL - 78c4500a434 based on jdk-21.0.2+13)

With this setup hackrf spectrum works fine! Hope this helps!