B4J Question [Solved] java.lang.IllegalArgumentException: array element type mismatch when using JavaObject.InitializeArray()

aeric

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Error occured at line #57:

Waiting for debugger to connect...
Program started.
Error occurred on line: 57 (Main)
java.lang.IllegalArgumentException: array element type mismatch
at java.lang.reflect.Array.set(Native Method)
at anywheresoftware.b4j.object.JavaObject.InitializeArray(JavaObject.java:109)
at b4j.example.main._testwrite(main.java:91)
at b4j.example.main._appstart(main.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:629)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:234)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:109)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:96)
at b4j.example.main.main(main.java:29)

Program terminated (StartMessageLoop was not called).

B4X:
'Non-UI application (console / server application)
#Region Project Attributes 
    #CommandLineArgs:
    #MergeLibraries: True
    #AdditionalJar: jdbf-1.2.jar
#End Region

Sub Process_Globals

End Sub

Sub AppStart (Args() As String)
    TestWrite
End Sub

Sub TestRead
    ' Set charset to GBK
    Dim CSet As JavaObject
    CSet.InitializeStatic("java.nio.charset.Charset")
    Dim cs As Object = CSet.RunMethod("forName", Array As String("GBK"))
    
    ' Initialize DBF Reader
    Dim dbfReader As JavaObject
    dbfReader.InitializeNewInstance("com.hexiong.jdbf.DBFReader", Array As Object ("testwrite.dbf"))

    ' Get field name
    Dim FieldsName As String
    Dim FieldsCount As Object = dbfReader.RunMethod("getFieldCount", Null)
    For i = 0 To FieldsCount - 1
        Dim Fld As JavaObject = dbfReader.RunMethod("getField", Array As Object(i))
        Dim Nam As String = Fld.RunMethod("getName", Null)
        FieldsName = FieldsName & $"${Nam}  |  "$
    Next
    Log(FieldsName)
    
    ' Read fields
    i = 0
    Do While dbfReader.RunMethod("hasNextRecord", Null)
        Dim res() As Object = dbfReader.RunMethod("nextRecord", Array As Object(cs))
        Dim row As String
        For Each Field In res
            row = row & $"${Field}  |  "$
        Next
        Log(row & CRLF)
        i = i + 1
    Loop
    Log("Total Count: " & i)
    
    ' Close the dbf file
    dbfReader.RunMethod("close", Null)
End Sub

Sub TestWrite
    ' Initialize JDB Fields
    Dim JDBField As JavaObject
    
    Dim col1 As JavaObject = JDBField.InitializeArray("com.hexiong.jdbf.JDBField", Array As Object("ID", "C".As(Char), 8, 0))
    Dim col2 As JavaObject = JDBField.InitializeArray("com.hexiong.jdbf.JDBField", Array As Object("Name", "C".As(Char), 254, 0))
    Dim col3 As JavaObject = JDBField.InitializeArray("com.hexiong.jdbf.JDBField", Array As Object("TestN", "N".As(Char), 20, 0))
    Dim col4 As JavaObject = JDBField.InitializeArray("com.hexiong.jdbf.JDBField", Array As Object("TestF", "F".As(Char), 20, 6))
    Dim col5 As JavaObject = JDBField.InitializeArray("com.hexiong.jdbf.JDBField", Array As Object("TestD", "D".As(Char), 8, 0))
    
    Dim JDBFields As JavaObject
    Dim fields() As Object = JDBFields.InitializeArray("com.hexiong.jdbf.JDBField", Array(col1, col2, col3, col4, col5))
    
    ' Initialize DBF Writer
    Dim dbfWriter As JavaObject
    dbfWriter.InitializeNewInstance("com.hexiong.jdbf.DBFWriter", Array As Object ("testwrite.dbf", fields))


    Dim row1 As Object = Array("1", "hexiong ", 500, 500.123, DateTime.Date(DateTime.Now))
    Dim row2 As Object = Array("2", " hefang ", 600, 600.234, DateTime.Date(DateTime.Now))
    Dim row3 As Object = Array("3", "hexi01234567890123456789012345678901234567890123456789" & _
    "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789" & _
    "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789", 600, 600.234, DateTime.Date(DateTime.Now))
    Dim row4 As Object = Array("4", "heqiang", 700, 700.456, DateTime.Date(DateTime.Now))

    Dim records() As Object
    records = Array As Object(row1, row2, row3, row4)
    For i = 0 To records.Length - 1
        dbfWriter.RunMethod("addRecord", Array As Object(records(i)))
    Next
    
    ' Close the dbf file
    dbfWriter.RunMethod("close", Null)
    
    Log("testwrite.dbf write finished.......")
    TestRead
End Sub
 

Attachments

  • DBF.zip
    1.5 KB · Views: 59
Solution
Still no jdbf-1.2.jar in the archive so I can't run it. Your link only gives the source code. However I guess you want to do this - which is not what your code in the project does.

Java:
JDBField[] fields = { new JDBField("ID", 'C', 8, 0),
                     new JDBField("Name", 'C', 32, 0),
                     new JDBField("TestN", 'N', 20, 0)
                     new JDBField("TestF", 'F', 20, 6) }
You need to do something like this to get a JDBField instance and then put that instance in an array of Objects. I haven't tried this as I don;t have the jdbf jar.
B4X:
Dim JDBFieldAs JavaObject
JDBField.InitializeNewInstance("com.hexiong.jdbf.", Array As Object("ID", "C".As(Char), 8, 0))

agraham

Expert
Licensed User
Longtime User
I can't download your archive and can't find jdbf-1.2.jar to look at but your code is trying to create an array of com.hexiong.jdbf.JDBField instances and it seems that the values you give for the array contents cannot be cast to a com.hexiong.jdbf.JDBField type.

EDIT: The forum must have had a glitch. I can now download the archive (I kept getting not found errors before) but I still can't find jdbf-1.2.jar.
 
Upvote 1

aeric

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Longtime User
I can't download your archive and can't find jdbf-1.2.jar to look at but your code is trying to create an array of com.hexiong.jdbf.JDBField instances and it seems that the values you give for the array contents cannot be cast to a com.hexiong.jdbf.JDBField type.
I think because I reupload the attachment just now. Try download again or I will attached the file again.

The jar is based on https://code.google.com/p/jdbf/

Related post:

EDIT: In case you don't want to download the library, I attach the jar here.
 

Attachments

  • jdbf-1.2.jar
    12.3 KB · Views: 62
Upvote 0

agraham

Expert
Licensed User
Longtime User
Still no jdbf-1.2.jar in the archive so I can't run it. Your link only gives the source code. However I guess you want to do this - which is not what your code in the project does.

Java:
JDBField[] fields = { new JDBField("ID", 'C', 8, 0),
                     new JDBField("Name", 'C', 32, 0),
                     new JDBField("TestN", 'N', 20, 0)
                     new JDBField("TestF", 'F', 20, 6) }
You need to do something like this to get a JDBField instance and then put that instance in an array of Objects. I haven't tried this as I don;t have the jdbf jar.
B4X:
Dim JDBFieldAs JavaObject
JDBField.InitializeNewInstance("com.hexiong.jdbf.", Array As Object("ID", "C".As(Char), 8, 0))
 
Upvote 0
Solution

aeric

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Licensed User
Longtime User
Upvote 0

aeric

Expert
Licensed User
Longtime User
Solved.
I posted an update to the code snippet.

 
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