In this small note I want to share the information regarding the ~+JFxxxxx.tmp files
that are produced by JVM during it's work with JasperReports Library/JasperReports Server.
1) Why those files are produced?(e.g. instead use memory)What data is included? |
The files are not directly created by JR but by the JRE, more
specifically by java.awt.Font.createFont(int, InputStream). It seems
that the JRE (the Sun/Oracle implementation at least) needs to work with
font files and doesn't support in memory font data.
2) What is the size of file and number of file depend on?(Font data size? or reports? or something?) |
Each file is a copy of a font file defined in a font extension. Note
that in some classloading scenarios a font extension can be loaded
several times, resulting in several temp files.
3) Why sometimes temp files are not deleted? in what case? |
The files should be deleted on graceful JRE shutdown. They are not
deleted when the Java process is forcefully killed.
4) Are these files made by JasperReportsLibrary?Can I change their location? |
Yes.
If you need to change the directory in which these files are generated
please define or change the value of the -Djava.io.tmpdir variable for your application.
Thank you for your attention to this article.
Alex
Recommended Comments
There are no comments to display.