Environment variable to control java.io.tmpdir?

Hmmm — since this is handled by the JVM, I delved into the OpenJDK VM source code a little bit, thinking that maybe what’s done by OpenJDK mimics what’s done by Java 6 and prior. It isn’t reassuring that there’s a way to do this other than on Windows.

On Windows, OpenJDK’s get_temp_directory() function makes a Win32 API call to GetTempPath(); this is how on Windows, Java reflects the value of the TMP environment variable.

On Linux and Solaris, the same get_temp_directory() functions return a static value of /tmp/.

I don’t know if the actual JDK6 follows these exact conventions, but by the behavior on each of the listed platforms, it seems like they do.

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