Re: Exception when moving from windows to linux

Dear Matthias,

please try to install the X Virtual Frame Buffer (XVFB) and start that
in the background, before starting the Java VM.
As far as I know, the Java VM needs a Graphic Device for all the AWT
based operations, inclduing Fonts.

Best regards
Andreas 

On Wed, 2020-02-19 at 08:40 +0100, Matthias Pfeifer wrote:
> Hi there,
> 
> I am using apache poi 4.1.0 and i have some code that should create a
> Workbook, create a sheet, put some data in it and store it into file
> system. My code runs fine on my windows box but throws exception when
> moving to linux (please no jokes about linux box refusing code due to bad
> smell, i had some of those already ;-) ).
> 
> I am running into this exception when I am calling autoSizeColumn(...) on a
> XSSFSheet (in a XSSFWorkbook)...
> 
> Here's my stacktrace:
> 
> java.lang.InternalError: java.lang.reflect.InvocationTargetException
>         at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:86)
> ~[?:?]
>         at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
>         at
> sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74) ~[?:?]
>         at java.awt.Font.getFont2D(Font.java:497) ~[?:?]
>         at java.awt.Font.canDisplayUpTo(Font.java:2246) ~[?:?]
>         at java.awt.font.TextLayout.singleFont(TextLayout.java:469) ~[?:?]
>         at java.awt.font.TextLayout.<init>(TextLayout.java:530) ~[?:?]
>         at
> org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:273)
> ~[poi-4.1.0.jar:4.1.0]
>         at
> org.apache.poi.ss.util.SheetUtil.getColumnWidth(SheetUtil.java:248)
> ~[poi-4.1.0.jar:4.1.0]
>         at
> org.apache.poi.ss.util.SheetUtil.getColumnWidth(SheetUtil.java:233)
> ~[poi-4.1.0.jar:4.1.0]
>         at
> org.apache.poi.xssf.usermodel.XSSFSheet.autoSizeColumn(XSSFSheet.java:549)
> ~[poi-ooxml-4.1.0.jar:4.1.0]
>         at
> org.apache.poi.xssf.usermodel.XSSFSheet.autoSizeColumn(XSSFSheet.java:531)
> ~[poi-ooxml-4.1.0.jar:4.1.0]
>         at my.package.rest.api.exportTable(ExportTable.java:181)
> ~[classes/:?]
>        <SNIP>
> 
> Caused by: java.lang.reflect.InvocationTargetException
>         at
> jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method) ~[?:?]
>         at
> jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> ~[?:?]
>         at
> jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> ~[?:?]
>         at java.lang.reflect.Constructor.newInstance(Constructor.java:490)
> ~[?:?]
>         at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:84)
> ~[?:?]
>         ... 63 more
> 
> Caused by: java.lang.NullPointerException
>         at
> sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1262) ~[?:?]
>         at
> sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:225)
> ~[?:?]
>         at sun.awt.FontConfiguration.init(FontConfiguration.java:107) ~[?:?]
>         at
> sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:719)
> ~[?:?]
>         at sun.font.SunFontManager$2.run(SunFontManager.java:367) ~[?:?]
>         at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
>         at sun.font.SunFontManager.<init>(SunFontManager.java:312) ~[?:?]
>         at sun.awt.FcFontManager.<init>(FcFontManager.java:35) ~[?:?]
>         at sun.awt.X11FontManager.<init>(X11FontManager.java:56) ~[?:?]
>         at
> jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method) ~[?:?]
>         at
> jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> ~[?:?]
>         at
> jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> ~[?:?]
>         at java.lang.reflect.Constructor.newInstance(Constructor.java:490)
> ~[?:?]
>         at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:84)
> ~[?:?]
>         ... 63 more
> 
> 
> I got the impression that the issue might deal with font availability on
> linux. The host system has no x11 installed for example.
> 
> How would I be able to have my code running on the linux box? Is the choice
> of Workbook important? Would it help to use a HSSFWorkbook instead?
> 
> 
> 
> Thanks in advance
> 
> 
> Matthias.