B4J Question [SOLVED???] java.lang.NumberFormatException: empty String

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rosippc64a

Active Member
Licensed User
Longtime User
Hi All,
I encountered a weird error and can't solve it, where is the number? I just want to ask whether in the map there is a key, isn't it?
I renamed the variable name dbinimap, the key ("beepath"), may this is the reason of error, but not. If I delete the line if ... containskey, and read the value: dbinimap.get("bexepath"), then the error goes to that line. The program exit, without could go into the catch!

B4X: 
    Dim backupexepath As String = "" '"c:\Program Files (x86)\PostgreSQL\9.0\bin\pg_dump.exe"
    If File.Exists(File.DirApp,Codebase.PGSETINI)=True Then
        'hálózatban minden munkaállomáson be kell állítani egyszer a db ip címét!
        dbinimap = File.ReadMap(File.DirApp,Codebase.PGSETINI)
        Try
            If dbinimap.IsInitialized=True Then
                If dbinimap.ContainsKey("bexepath")=True Then '<----- java.lang.NumberFormatException: empty String
                    backupexepath = "" & dbinimap.Get("bexepath")
                End If
            End If
        Catch
            backupexepath = ""
        End Try
    End If
The file what readmap will read:
B4X: 
#Thu Jul 23 14:20:35 CEST 2020
dblocation=127.0.0.1

The error:
B4X: 
An error occurred:
(Line: 448) 448
java.lang.NumberFormatException: empty String
 
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rosippc64a said:
B4X:
Code: 
#Thu Jul 23 14:20:35 CEST 2020
dblocation=127.0.0.1
Click to expand...
This does not correspond to the structure of a map.

Map is a collection that maps keys to values.
It can also be named hashtable, dictionary or associative array.

Each item is made of a key and value. Access to the value is always done through the key.

Ref:

Map Collection - The most useful collection...

Map is a collection that maps keys to values. It can also be named hashtable, dictionary or associative array. Each item is made of a key and value. Access to the value is always done through the key. Retrieving the key is a fast operation. The size of the map doesn't affect the performance...
www.b4x.com www.b4x.com

File. ReadMap (Dir As String, FileName As String) As Map
Reads the file and parses each line as a key-value pair (of strings).
 
Upvote 0
Jorge M A said:
This does not correspond to the structure of a map.

Map is a collection that maps keys to values.
It can also be named hashtable, dictionary or associative array.

Each item is made of a key and value. Access to the value is always done through the key.

Ref:

Map Collection - The most useful collection...

Map is a collection that maps keys to values. It can also be named hashtable, dictionary or associative array. Each item is made of a key and value. Access to the value is always done through the key. Retrieving the key is a fast operation. The size of the map doesn't affect the performance...
www.b4x.com www.b4x.com

File. ReadMap (Dir As String, FileName As String) As Map
Reads the file and parses each line as a key-value pair (of strings).
Click to expand...
But yes, that file was written by file.writemap(...)
 
Upvote 0
Are you producing the error message in Debug mode or Release mode? It makes a difference as to what the line numbers refer to (My off the cuff guess: Release mode, just a guess though)
 
Upvote 0
In debug mode the error message is only 3 lines, in release mode this:
B4X: 
Adatbázis mentése
main$ResumableSub_dbBackup.resume (java line: 655)
java.lang.NumberFormatException: empty String
    at java.base/jdk.internal.math.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
    at java.base/jdk.internal.math.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
    at java.base/java.lang.Double.parseDouble(Double.java:543)
    at b4j.leiszamla.main$ResumableSub_dbBackup.resume(main.java:655)
    at b4j.leiszamla.main._dbbackup(main.java:520)
    at b4j.leiszamla.main$ResumableSub_MenuBar1_Action.resume(main.java:1156)
    at b4j.leiszamla.main._menubar1_action(main.java:968)
    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.BA$1.run(BA.java:216)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    at java.base/java.lang.Thread.run(Thread.java:834)
 
Upvote 0
the error happen in this line (the java source of the bas file):
B4X: 
//BA.debugLineNum = 449;BA.debugLine="bep = dbinimap.GetDefault(\"backupexepath\",\"\")";
_bep = BA.ObjectToString(_dbinimap.GetDefault((Object)("backupexepath"),(Object)("")));
 
Upvote 0
If I put value into the ini (map) file, even though it will exited with
B4X: 
An error occurred:
(Line: 449) 449
java.lang.NumberFormatException: empty String
error message.
Map file:
B4X: 
#Thu Jul 23 14:20:35 CEST 2020
backupexepath=c:\\Program Files (x86)\\PostgreSQL\\9.0\\bin\\pg_dump.exe
dblocation=127.0.0.1
 
Upvote 0
i have no problem reading the map
 

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Upvote 0
I was stupid (again), but in the debug mode the program exited there. The mistake (lower!):
B4X: 
    Dim dbinimap As Map
    Dim bep As String = "" '"c:\Program Files (x86)\PostgreSQL\9.0\bin\pg_dump.exe"
    If File.Exists(File.DirApp,Codebase.PGSETINI)=True Then
        'hálózatban minden munkaállomáson be kell állítani egyszer a db ip címét!
        dbinimap = File.ReadMap(File.DirApp,Codebase.PGSETINI)
        Try
            If dbinimap.IsInitialized=True Then
                If dbinimap.ContainsKey("backupexepath")=True Then
                    bep = dbinimap.Get("backupexepath")  '<---- error happened here (in debug and release mode too)
                End If
            End If
        Catch
            bep = ""
        End Try
    End If
    If bep.Length = "" Then <---- error was here: this is why was mentioned numberformat and empty string. when I correct this, all error disappeared!!!!
thank you for all who helped to reveal the reason!

*****************************************************
but why was signaled a good line as erroneous and a
wrong line as good?
*****************************************************
 
Last edited:
Upvote 0
you never showed us this before:
B4X: 
    If bep.Length = "" Then <---- error was here: this is why was mentioned numberformat and empty string. when I correct here, all error disappe

we would have said something much sooner.
 
Upvote 0
Just for testing purposes, put the error back in, do a Tools->Clean Project and re-run it to see if it changes the error location
 
Upvote 0
I did it conscientiously. Cleaned the project.
The line "If bep.Length = "" Then" makes happen an error in much previous line "bep = dbinimap.Get("backupexepath")" !
 
Last edited:
Upvote 0
rosippc64a said:
I was stupid (again), but in the debug mode the program exited there. The mistake (lower!):
B4X: 
    If bep.Length = "" Then <---- error was here: this is why was mentioned numberformat and empty string. when I correct this, all error disappeared!!!!
but why was signaled a good line as erroneous and a wrong line as good?
Click to expand...

A better why question is: why are you comparing a number to a string?

Why not:
B4X: 
    If bep.Length = 0 Then
 
Upvote 0
emexes said:
A better why question is: why are you comparing a number to a string?

Why not:
B4X: 
    If bep.Length = 0 Then
Click to expand...
obviously not intentionally, but in the same time I modify multiple program lines and my attention was captured other inportant things, so it remains as erroneous.
After that I was mislead by the errors, happened here
B4X: 
If dbinimap.ContainsKey("bexepath")=True Then '<----- java.lang.NumberFormatException: empty String
                    backupexepath = "" & dbinimap.Get("bexepath")
what was so surprizing, that my eyes can't go next.
 
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