B4J Question [SOLVED] How to Create a Download Server?

incendio

Well-Known Member
Licensed User
Longtime User
Hi guys,

How to create a non UI B4J server to serve as a host for download file from B4A App?

I want to download a file from B4A using this method :

Download huge files with HttpUtils2

Better to use: https://www.b4x.com/android/forum/threads/simple-progress-http-download.127214/#post-796463 The attached project includes a slightly modified version of HttpUtils2 and a new service named DownloadService. The purpose of DownloadService is to make it simple to download files of...
www.b4x.com
 
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incendio

Well-Known Member
Licensed User
Longtime User
Erel said:
Note that you don't need to implement anything for this. Just run the server and you can serve files from the 'WWW' folder.
Click to expand...
Since I only need download service, I changed the codes into these
B4X: 
Sub AppStart (Args() As String)
    srvr.Initialize("srvr")
    srvr.Port = 54021
    srvr.Start
    Log("Server started")
    StartMessageLoop
End Sub

On B4J IDE, it runs OK, but on command prompt, with this command
B4X: 
java -jar FileServer.jar

Error raised :
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: anywheresoftware/b4a/BA
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: anywheresoftware.b4a.BA
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more

I am using java version "1.8.0_201"
 
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