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The nifi-warp10-processor (build from source or the compiled version from release pages) can not be instantiated (nifi-1.19).
The logs show the following message
Nifi UI message
Unable to obtain temporary component for io.warp10.nifi.WarpScriptProcessor

Nifi app logs message
2023-02-04 12:50:05,531 INFO [NiFi Web Server-22] io.warp10.continuum.store.Constants ########[ Initialized with 1000 time units per millisecond ]########
2023-02-04 12:50:05,549 WARN [NiFi Web Server-22] i.warp10.script.WarpFleetMacroRepository No validator macro, default macro will reject all URLs.
2023-02-04 12:50:05,903 INFO [NiFi Web Server-22] io.warp10.script.functions.REPORT REPORT secret not set, using 'dbe74d59-f0cc-409b-9b8a-653e25802ce1'.
2023-02-04 12:50:06,338 INFO [NiFi Web Server-22] io.warp10.nifi.WarpScriptProcessor

__ | / /_____ _______________ < / __
__ | /| / / __ `/_ / __ \ __ / / / /
__ |/ |/ / / // / / __ // / _ / / // /
/|__/ _,/ // _ ./ // __/
//

Revision: 2.11.1

2023-02-04 12:50:06,346 INFO [NiFi Web Server-22] io.warp10.script.WarpScriptLib LOADED extension 'io.warp10.script.ext.debug.DebugWarpScriptExtension'
2023-02-04 12:50:06,351 INFO [NiFi Web Server-22] io.warp10.script.WarpScriptLib LOADED extension 'io.warp10.script.ext.http.HttpWarpScriptExtension'
2023-02-04 12:50:06,352 INFO [NiFi Web Server-22] io.warp10.script.WarpScriptLib LOADED extension 'io.warp10.script.ext.logging.LoggingWarpScriptExtension'
2023-02-04 12:50:06,354 INFO [NiFi Web Server-22] io.warp10.script.WarpScriptLib LOADED extension 'io.warp10.script.ext.rexec.RexecWarpScriptExtension'
2023-02-04 12:50:06,359 INFO [NiFi Web Server-22] io.warp10.script.WarpScriptLib LOADED extension 'io.warp10.script.ext.sensision.SensisionWarpScriptExtension'
2023-02-04 12:50:06,383 ERROR [NiFi Web Server-22] o.a.n.n.StandardExtensionDiscoveringManager Could not instantiate class of type io.warp10.nifi.WarpScriptProcessor using ClassLoader for bundle io.warp10:nifi-warp10-processor:1.0.0
java.lang.ClassCastException: class [B cannot be cast to class [C ([B and [C are in module java.base of loader 'bootstrap')
at io.warp10.continuum.gts.UnsafeString.getChars(UnsafeString.java:98)
at io.warp10.continuum.gts.UnsafeString.sanitizeStrings(UnsafeString.java:436)
at io.warp10.script.MemoryWarpScriptStack.exec(MemoryWarpScriptStack.java:555)
at io.warp10.script.WarpScriptExecutor.(WarpScriptExecutor.java:162)
at io.warp10.script.WarpScriptExecutor.(WarpScriptExecutor.java:120)
at io.warp10.script.WarpScriptExecutor.(WarpScriptExecutor.java:116)
at io.warp10.nifi.WarpScriptProcessor.init(WarpScriptProcessor.java:163)

Could it be a cast of type which is not allowed ?
Is there a dependency on a specific java version ?