I've used the TMP
environment variable to control things like where gcc writes it's temporary files, but I can't seem to find an equivalent for java's createTempFile API.
Does such an environment variable exist?
This question is related to
java
configuration
environment-variables
temp
Use below command on UNIX terminal :
java -XshowSettings
This will display all java properties and system settings.
In this look for java.io.tmpdir
value.
According to the java.io.File
Java Docs
The default temporary-file directory is specified by the system property java.io.tmpdir. On UNIX systems the default value of this property is typically "/tmp" or "/var/tmp"; on Microsoft Windows systems it is typically "c:\temp". A different value may be given to this system property when the Java virtual machine is invoked, but programmatic changes to this property are not guaranteed to have any effect upon the the temporary directory used by this method.
To specify the java.io.tmpdir
System property, you can invoke the JVM as follows:
java -Djava.io.tmpdir=/path/to/tmpdir
By default this value should come from the TMP
environment variable on Windows systems
To be clear about what is going on here:
The recommended way to set the temporary directory location is to set the System property called "java.io.tmpdir", e.g. by giving the option -Djava.io.tmpdir=/mytempdir
to the java
command. The property can also be changed from within a program by calling System.setProperty("java.io.tmpdir", "/mytempdir)
... modulo sandbox security issues.
If you don't explicitly set the "java.io.tmpdir" property on startup, the JVM initializes it to a platform specific default value. For Windows, the default is obtained by a call to a Win32 API method. For Linux / Solaris the default is apparently hard-wired. For other JVMs it could be something else.
Empirically, the "TMP" environment variable works on Windows (with current JVMs), but not on other platforms. If you care about portability you should explicitly set the system property.
You could set your _JAVA_OPTIONS
environmental variable. For example in bash this would do the trick:
export _JAVA_OPTIONS=-Djava.io.tmpdir=/new/tmp/dir
I put that into my bash login script and it seems to do the trick.
It isn't an environment variable, but still gives you control over the temp dir:
-Djava.io.tmpdir
ex.:
java -Djava.io.tmpdir=/mytempdir
we can change the default tomcat file upload location, as
we have to set the environment variable like : CATALINA_TEMPDIR = YOUR FILE UPLOAD LOCATION. this location will change the path here: java -Djava.io.tmpdir=/path/to/tmpdir
Use
$ java -XshowSettings
Property settings:
java.home = /home/nisar/javadev/javasuncom/jdk1.7.0_17/jre
java.io.tmpdir = /tmp
If you look in the source code of the JDK, you can see that for unix systems the property is read at compile time from the paths.h or hard coded. For windows the function GetTempPathW
from win32 returns the tmpdir
name.
For posix systems you might expect the standard TMPDIR
to work, but that is not the case. You can confirm that TMPDIR
is not used by running TMPDIR=/mytmp java -XshowSettings
Source: Stackoverflow.com