Android Question java.lang.ClassNotFoundException: de.xxxxxxxxxxxxx.clsinappbilling$_applizenz

Filippo · Sep 28, 2022

Hi,

I have a very strange error.

If I change the name of a classe, from clsinappbilling.bas to clsinappbilling3.bas, then the sub "ReadMapAsB4XObject" (the procedure is in a general module "mAllg") cannot read a file anymore, although the classe has not changed.
Where can the problem be?

The name "applizenz" is a type in the classe.

B4X:

    Type Applizenz(PurchaseTime As Long, PurchaseToken As String, Sku As String)

Modul mAllg:

B4X:

Public Sub ReadMapAsB4XObject(sDir As String, sFilename As String) As Map
    Dim raf As RandomAccessFile
    raf.Initialize2(sDir, sFilename, False, True)
    Dim mp As Map = raf.ReadB4XObject(raf.CurrentPosition)
    raf.Close
    Return mp
End Sub

In the classe the file is read with this procedure:

B4X:

Private Sub GetOwnedProductsOffline
    If File.Exists(File.DirInternal,"lizenz.mp") Then
        'Der Lizenz-File wird als B4XObject gespeichert
        ReadLizenzFile
    End If
End Sub

Private Sub ReadLizenzFile
    Dim lizenz As Applizenz
    Dim mp As Map
    mp.Initialize

   mp = mAllg.ReadMapAsB4XObject(File.DirInternal, "lizenz.mp")
End If

Error:

*** Service (starter) Create ***
Error occurred on line: 890 (mAllg)
java.lang.RuntimeException: java.lang.ClassNotFoundException: fg.cronomillemiglia.clsinappbilling$_applizenz
at anywheresoftware.b4a.randomaccessfile.B4XSerializator.readType(B4XSerializator.java:314)
at anywheresoftware.b4a.randomaccessfile.B4XSerializator.readObject(B4XSerializator.java:374)
at anywheresoftware.b4a.randomaccessfile.B4XSerializator.readMap(B4XSerializator.java:248)
at anywheresoftware.b4a.randomaccessfile.B4XSerializator.readObject(B4XSerializator.java:364)
at anywheresoftware.b4a.randomaccessfile.B4XSerializator.ReadObject(B4XSerializator.java:129)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.ReadB4XObject(RandomAccessFile.java:340)
at fg.cronomillemiglia.mallg._readmapasb4xobject(mallg.java:2211)
at fg.cronomillemiglia.clsinappbilling3._readlizenzfile(clsinappbilling3.java:1554)
at fg.cronomillemiglia.clsinappbilling3._getownedproductsoffline(clsinappbilling3.java:1524)
at fg.cronomillemiglia.clsinappbilling3._initialize(clsinappbilling3.java:440)
at fg.cronomillemiglia.starter._service_create(starter.java:1504)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:146)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
at fg.cronomillemiglia.starter.onCreate(starter.java:56)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3342)
at android.app.ActivityThread.-wrap4(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1680)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6518)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.ClassNotFoundException: fg.cronomillemiglia.clsinappbilling$_applizenz
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:453)
at java.lang.Class.forName(Class.java:378)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.readTypeClass(RandomAccessFile.java:583)
at anywheresoftware.b4a.randomaccessfile.B4XSerializator.readType(B4XSerializator.java:291)
... 27 more
Caused by: java.lang.ClassNotFoundException: Didn't find class "fg.cronomillemiglia.clsinappbilling$_applizenz" on path: DexPathList[[zip file "/data/app/fg.cronomillemiglia-sVbtZAWHHM9Wa59Pn9In2Q==/base.apk"],nativeLibraryDirectories=[/data/app/fg.cronomillemiglia-sVbtZAWHHM9Wa59Pn9In2Q==/lib/arm64, /system/lib64, /system/vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
... 32 more
** Service (starter) Start **

DonManfred · Sep 28, 2022

Filippo said:
Where can the problem be?

the new Classname. clsinappbilling -> clsinappbilling3

Filippo · Sep 28, 2022

DonManfred said:
the new Classname. clsinappbilling -> clsinappbilling3

Why should it be a problem? I initialize the classe also with the new name.

agraham · Sep 28, 2022

Have you tried cleaning the project? It looks like something doesn't know about the name change.

Filippo · Sep 28, 2022

agraham said:
Have you tried cleaning the project? It looks like something doesn't know about the name change.

Yes, several times already.
The compiler simply does not find the type "applizenz" anymore, although it is always in the same classe.

agraham · Sep 28, 2022

What is this call. It is where the error actully occurs. What is mAllg and is it your code in ReadMapAsB4XObject

mAllg.ReadMapAsB4XObject

EDIT : Sorry = didn't read the code fragments carefully

agraham · Sep 28, 2022

Ah! You are reading an object from a file that is already saved. The type of the saved object in the file is using the old class name as that is what it was saved as. You need to rewrite the file with the new class name. The class name is part of the type name.

Filippo · Sep 28, 2022

agraham said:
Ah! You are reading an object from a file that is already saved. The type of the saved object in the file is using the old class name as that is what it was saved as. You need to rewrite the file with the new class name. The class name is part of the type name.

Ok. That's what I thought, but I couldn't imagine the class name being stored in the file.

Isn't that an error?

agraham · Sep 28, 2022

Filippo said:
Isn't that an error?

No. That's the way it works. ~~You can have the same type name in different classes~~ The actual type name includes its class name as that's how it works in Java

EDIT: Wrong again! I'm being too hasty tonight I think I am right but try rewriting the file with the new class object and see if it fixes it.

Filippo · Sep 28, 2022

EDIT: Wrong again! I'm being too hasty tonight

but try rewriting the file with the new class object and see if it fixes it.

Unfortunately, this does not work for the user.
I have to open the file first and check if a license is available.

Filippo · Sep 28, 2022

I have changed the classe name because of versioning.
Since the name change causes problems, so I created a b4xlib library from the classe.
Here you can change the version without problems.

Erel · Sep 29, 2022

Tip: in the future you should use B4XSerializator directly:

B4X:

Public Sub ReadMapAsB4XObject(sDir As String, sFilename As String) As Map
    Dim ser 
    Return ser.ConvertObjectToBytes(File.ReadBytes(sDir, sFilename)
End Sub

The file format is a slightly different than RAF.WriteB4XObject / ReadB4XObject so you cannot change now.

The type name with the enclosing class is saved. Types declared in Main module or B4XMainPage can be used in apps with different package names.

Filippo · Sep 29, 2022

Tip: in the future you should use B4XSerializator directly:

Unfortunately, this is no longer possible with this app.
With new app I already use it.

Ronomega73 · Nov 12, 2023

Hello! I'm not sure if this is still unsolved but I have just experienced the same problem while trying to fix another unrelated one. The Class Not Found error showed when I tried to transfer the type declaration from one module to the main activity module. When I moved back the type declaration to where it originally was the error went away. It seems that when you have already created an object of the same type and then later on move that type declaration somewhere else, using/referencing the said object will generate the Class Not Found error.

Android Question java.lang.ClassNotFoundException: de.xxxxxxxxxxxxx.clsinappbilling$_applizenz

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