B4J Question B4JPackager11 error

[Gnappo jr]

Hello everybody
for the first time I have used the program B4JPackager11, but on line 144
(I attach the file MANIFEST.MF renamed to .txt)

Sub FindPackageName As ResumableSub
Wait For (RunShell(False, "jar", Array("xf", "jar.jar", "META-INF"))) Complete (StdOut As String)
Dim s As String = File.ReadString(TempFolder, "META-INF/MANIFEST.MF")
Dim m As Matcher = Regex.Matcher2($"^JavaFX-Application-Class:\s+(.*)\.main$"$, Regex.MULTILINE, s)
m.Find
PackageName = m.Group(1)' <======= 144 LINE <====== <=========
Log($"Package name: ${PackageName}"$)
Return True
End Sub

I get the following error:

Waiting for debugger to connect...
Program started.
B4JPackager11 Version 1.13
InputJar: C:\z\xxxxxxx - 2.00 RESILIENTE\__STARGATE B4J E ASP\STARGATE\STARGATE B4J\Objects\Stargate.jar
Running: C:\z\B4J-IN~1\Objects\temp\FindDosPath.exe
Running: C:\Program Files\Java\jdk-11.0.1\bin\jar
Errore nella linea: 144 (Main)
java.lang.IllegalStateException: No match found
at java.base/java.util.regex.Matcher.group(Matcher.java:645)
at anywheresoftware.b4a.keywords.Regex$MatcherWrapper.Group(Regex.java:154)
at b4j.example.main$ResumableSub_FindPackageName.resume(main.java:997)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resumeAsUserSub(DebugResumableSub.java:47)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:632)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:91)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:78)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resume(DebugResumableSub.java:42)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:136)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:85)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:78)
at anywheresoftware.b4a.keywords.Common$3.run(Common.java:1086)
at anywheresoftware.b4a.keywords.SimpleMessageLoop.runMessageLoop(SimpleMessageLoop.java:30)
at anywheresoftware.b4a.StandardBA.startMessageLoop(StandardBA.java:26)
at anywheresoftware.b4a.shell.ShellBA.startMessageLoop(ShellBA.java:119)
at anywheresoftware.b4a.keywords.Common.StartMessageLoop(Common.java:153)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:309)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:91)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:78)
at b4j.example.main.main(main.java:29)

 

[Erel]

Are you building a package for a UI app? It will not work with non-ui apps (which are simpler to distribute).

 

[Gnappo jr]

Are you building a package for a UI app? It will not work with non-ui apps (which are simpler to distribute).

No I'm creating a package for a non-UI application
I compile with jdk-11.0.1
but in but in the target I don't know how to find and install java jdk-11.0.1
all that today I get by launching my app on the target PC with the latest version of java 8-231, is this error message:

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError:
b4j/example/main has been compiled by a more recent version of the Java Runtime (class file version 53.0),
this version of the Java Runtime only recognizes class file versions up to 52.0

I'm really confused between the various versions of java present and between jre and sdk, I don't find an
appropriate installation of java but only of the zip files to unpack.

Best regards

 

[Erel]

You can compile your app with Java 8 and it will then run with a double click on any computer with Java 8+ installed.

 

[Gnappo jr]

You can compile your app with Java 8 and it will then run with a double click on any computer with Java 8+ installed.

Thanks for the reply. But this implies an additional question that can be useful to many people:
What is the official java version for B4J?
Best regards

 

[Erel]

Recommended versions are Java 8 and Java 11: https://www.b4x.com/b4j.html#installation

Other versions will work as well if properly configured.