huge amount of +~JF****.tmp files in /var/cache/tomcat7/temp

Question

In my tomcat temp folder, I have 2.5Gb of +~JF****.tmp files, the file sizes are either ~750K or ~23M

$ pwd
/var/cache/tomcat7/temp
$ ls -lt
-rw------- 1 tomcat tomcat 23278008 06:47  5 Th08 +~JF2247741302721424357.tmp
-rw------- 1 tomcat tomcat   773236 06:47  5 Th08 +~JF2626850872018060030.tmp
-rw------- 1 tomcat tomcat   750984 06:47  5 Th08 +~JF6955350201064404318.tmp
-rw------- 1 tomcat tomcat 23278008 06:34  5 Th08 +~JF5760450811263657816.tmp
...

I did you searching for this problem but all I found is about Jasper Report font problem which doesn't make sense to me, my project is not using Jasper.

do you have any idea why?

thanks

It's not jasper but java.awt.Font.createFont which does this. So maybe you are using a Font somewhere else. — OblongZebra, Sep 23 '16 at 14:19
thanks, I found out that one of the library I'm using did this by creating fonts — Dzung BUI, Sep 27 '16 at 11:26

score 3 · Answer 1 · answered Jul 17 '20 at 11:53

We are facing a similar problem and I would like to share what I found:

java.awt.Font.createFont(int i, java.io.InputStream in) generates a temporary file with a name +~XXXX.tmp (where XXXX is a long number).

When the JVM ends, all these files are deleted.

The problem arises when the JVM ends abruptly, as it doesn't delete temporary files, or for long-running JVM (i.e.: Tomcat production server).

What we did was just change the font creation method and use:

java.awt.Font.createFont(int i, java.io.File f)

With this method a temporary file is not created anymore.

huge amount of +~JF****.tmp files in /var/cache/tomcat7/temp

1 Answers1