Hi,
It is difficult to think of a solution which is both simple and reliable. Maybe
just grep through the output of "java -version" ? Here is the output of Sun's
java:
---------------------------
root at www:~# /usr/java/j2sdk1.4.2_11/bin/java -version
java version "1.4.2_11"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_11-b06)
Java HotSpot(TM) Client VM (build 1.4.2_11-b06, mixed mode)
---------------------------
And here is the output of the GNU java:
---------------------------
root at www:~# java -version
java version "1.4.2"
gij (GNU libgcj) version 4.1.0 20060508 (Red Hat 4.1.0-14)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
---------------------------
So maybe the following will do:
if ! java -version 2>&1 | grep -q 'Java(TM)'; then
echo "You need SUN JRE";
exit 1;
fi
With regard to the JAVA_HOME variable, if the xxe script uses JAVA_HOME to
locate the JRE, I will be able to run XXE with a command-line like:
JAVA_HOME="/usr/java/jdk1.5.0_07/jre/" /usr/local/xxe-std-3_3_0/bin/xxe
without the need to alter the default JRE for the whole system.
Regards,
Vesselin Atanasov
>----------------------------------
>
>Vesselin Atanasov wrote:
>> Thank you very much for the help. Indeed the xxe script tried to run the
>> GNU java implementation instead of the SUN one. After editing the xxe
>> script everything runs fine. Just a small idea - maybe it would be better
>> if the xxe script would respect the value of an environment variable, e.g.
>> JAVA_HOME and use it to locate the java executable. This way it would be
>> possible to set the JRE for XXE without system-wide changes and without the
>> need to edit the xxe script.
>
>Would what you suggest solve the problem of having gcj installed by
>default on most Linux distributions? I'm not sure (I know nothing at all
>about gcj).
>
>If you have a method, simple[*] and fast, which ensures that the xxe
>shell script fail with a clear error message, unless XXE is started
>using Sun's Java[tm], we'll certainly implement it.
>
>---
>[*] Counterexample: the shell script used to start ant (no bashing
>intended).
>
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