B4J Question setfield2 has error in release mode not in debug mode

hossein etezadi · Sep 26, 2022

HI Erel
I have a problem with Reflector
please tell me the solution
my code is this:

Dim PC As Printer = GetPrinter(myLabelPrinter)
Log("PC") : Log(PC)

Dim myResult As Boolean = False
For Each SP As JavaObject In PC.GetPrinterAttributes.GetSupportedPapers
Dim PP As Paper : PP.Initialize
PP=Paper_static.C
PP.SetObject(SP)
Log("PP") : Log(PP)
Try
Dim VAL As String=PP.tostring
Log("VAL") : Log(VAL)
If VAL.contains("2 x 4")=True Then
Log("PP2") : Log(PP) : Log(PP.GetWidth) : Log(PP.GetHeight)
Dim r As Reflector
r.Target = SP
Log("GetField")
r.setField2("width", 60)
r.SetField2("height", 30)
PP.SetObject(SP)

myResult = True
Exit
End If
Catch
Log(LastException)
End Try
Next

but I got java error on SetField2 in release mode not in debug mode

java.lang.reflect.InaccessibleObjectException: Unable to make field private double javafx.print.Paper.width accessible: module javafx.graphics does not "opens javafx.print" to unnamed module @537c850b

Best Regards
HosseinEtezadi

Erel · Sep 27, 2022

1. Please don't limit your questions to a single member.
2. Please use [code]code here...[/code] tags when posting code.

stevel05 · Sep 27, 2022

What are you trying to do?

If the page size you want is not available in GetSupportedPapers, it is unlikely that the printer will respond to the paper size being changed, even if you manage to change it.

The easiest way to use an unavailable paper size would be to choose a larger size, then restrict your layout to the size you actually want to print.

hossein etezadi · Sep 27, 2022

B4X:

Dim PC As Printer = GetPrinter(myLabelPrinter)
   Log("PC") : Log(PC)
  
   Dim myResult As Boolean = False
   For Each SP As JavaObject  In PC.GetPrinterAttributes.GetSupportedPapers
       Dim PP As Paper : PP.Initialize
       PP=Paper_static.C
       PP.SetObject(SP)
       Log("PP") : Log(PP)
       Try            
           Dim VAL As String=PP.tostring
           Log("VAL") : Log(VAL)
           If VAL.contains("2 x 4")=True  Then
               Log("PP2") : Log(PP) : Log(PP.GetWidth)  : Log(PP.GetHeight)
               Dim r As Reflector
               r.Target = SP
               Log("GetField")
               r.setField2("width", 60)
               r.SetField2("height", 30)
               PP.SetObject(SP)
          
               myResult = True
               Exit
           End If
       Catch
           Log(LastException)
       End Try
   Next

stevel05 · Sep 27, 2022

Check your logs, you should be seeing an entry:

B4X:

(NoSuchFieldException) java.lang.NoSuchFieldException: width

The paper class does not have a field for width and height. It is not configurable.

Better still remove the Try Catch block until the code is working.

hossein etezadi · Sep 27, 2022

stevel05 said:
What are you trying to do?

If the page size you want is not available in GetSupportedPapers, it is unlikely that the printer will respond to the paper size being changed, even if you manage to change it.

The easiest way to use an unavailable paper size would be to choose a larger size, then restrict your layout to the size you actually want to print.

Thanks Steve
I want to print barcode on label size 60*30 mm
print is ok in Debug mode but in release mode I got java error

hossein etezadi · Sep 27, 2022

Thanks Steve

stevel05 said:
Check your logs, you should be seeing an entry:

B4X:

(NoSuchFieldException) java.lang.NoSuchFieldException: width

The paper class does not have a field for width and height. It is not configurable.

Better still remove the Try Catch block until the code is working.

I removed the Try Catch but code just works ok in debug mode
but in release mode I get Java error:
java.lang.reflect.InaccessibleObjectException: Unable to make field private double javafx.print.Paper.width accessible: module javafx.graphics does not "opens javafx.print" to unnamed module @59456f4e
at java.base/java.lang.reflect.Field.setAccessible(Field.java:170)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:176)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)

stevel05 · Sep 27, 2022

Which version of JavaFX are you using?

stevel05 · Sep 27, 2022

You will need to add something like:

B4X:

#VirtualMachineArgs: --add-opens javafx.graphics/javafx.print=ALL-UNNAMED

To the top of you main Module.
And

B4X:

#PackagerProperty : VMArgs = --add-opens  javafx.graphics/javafx.print=b4j

If you want to build a package.

I can't test it as I don't get the same errors, which is why I am wondering which version you are using.

stevel05 · Sep 27, 2022

This is a better way of creating a Custom Paper rather than hacking an existing instance:

B4X:

    Dim Units As JavaObject
    Units.InitializeStatic("com.sun.javafx.print.Units")
    Dim PrintHelper As JavaObject
    PrintHelper.InitializeStatic("com.sun.javafx.print.PrintHelper")
    Dim Paper As JavaObject = PrintHelper.RunMethod("createPaper",Array("60mm x 30mm",60.0,30.0,Units.GetField("MM")))
    Log(Paper)

You will still need the --add-opens directives above plus:

B4X:

#PackagerProperty : VMArgs = --add-opens  javafx.graphics/com.sun.javafx.print=b4j

To package the project.

hossein etezadi · Sep 27, 2022

stevel05 said:
You will need to add something like:

B4X:

#VirtualMachineArgs: --add-opens javafx.graphics/javafx.print=ALL-UNNAMED

To the top of you main Module.
And

B4X:

#PackagerProperty : VMArgs = --add-opens javafx.graphics/javafx.print=b4j

If you want to build a package.

I can't test it as I don't get the same errors, which is why I am wondering which version you are using.

thanks a lot, Steve
that problem solved
Best Regards

hossein etezadi · Sep 27, 2022

stevel05 said:
This is a better way of creating a Custom Paper rather than hacking an existing instance:

B4X:

Dim Units As JavaObject Units.InitializeStatic("com.sun.javafx.print.Units") Dim PrintHelper As JavaObject PrintHelper.InitializeStatic("com.sun.javafx.print.PrintHelper") Dim Paper As JavaObject = PrintHelper.RunMethod("createPaper",Array("60mm x 30mm",60.0,30.0,Units.GetField("MM"))) Log(Paper)

You will still need the --add-opens directives above plus:

B4X:

#PackagerProperty : VMArgs = --add-opens javafx.graphics/com.sun.javafx.print=b4j

To package the project.

thanks, Steve
I used this code but I got this java error:
java.lang.IllegalAccessException: class anywheresoftware.b4j.object.JavaObject cannot access class com.sun.javafx.print.Units (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.print to unnamed module @e05be4e

stevel05 · Sep 27, 2022

Have you added the VirtualMachineArg directive in post #9 ?

stevel05 · Sep 27, 2022

Looks like you may also need:

B4X:

#VirtualMachineArgs: --add-opens javafx.graphics/com.sun.javafx.print=ALL-UNNAMED

i didn't need it, I guess it depends on which java version you are using.

hossein etezadi · Sep 27, 2022

stevel05 said:
Have you added the VirtualMachineArg directive in post #9 ?

Yes Steve
I have added it

hossein etezadi · Sep 28, 2022

stevel05 said:
This is a better way of creating a Custom Paper rather than hacking an existing instance:

B4X:

Dim Units As JavaObject Units.InitializeStatic("com.sun.javafx.print.Units") Dim PrintHelper As JavaObject PrintHelper.InitializeStatic("com.sun.javafx.print.PrintHelper") Dim Paper As JavaObject = PrintHelper.RunMethod("createPaper",Array("60mm x 30mm",60.0,30.0,Units.GetField("MM"))) Log(Paper)

You will still need the --add-opens directives above plus:

B4X:

#PackagerProperty : VMArgs = --add-opens javafx.graphics/com.sun.javafx.print=b4j

To package the project.

Hi Steve
I could not use this code instead I had to use "SetField2" from jreflection library to hack the paper size.
Best Regards

agraham · Sep 28, 2022

Did you put the following in your project? It works for me

#VirtualMachineArgs: --add-opens javafx.graphics/com.sun.javafx.print=ALL-UNNAMED

hossein etezadi · Sep 28, 2022

agraham said:
Did you put the following in your project? It works for me

#VirtualMachineArgs: --add-opens javafx.graphics/com.sun.javafx.print=ALL-UNNAMED

Hi
Yes I did it
thanks

B4J Question setfield2 has error in release mode not in debug mode

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