changing the system date from javacode

[ksrashmi]

Hi ,

I want to change the system date using java/jsp . i am using linux system .

public class LinuxJava {
public static void main(String[] args) {
try {
String command = "date 07212008";
final Process process = Runtime.getRunt ime().exec(comm and);

// int returnCode = process.waitFor ();
// process.toStrin g()
System.out.prin tln("Return code = " + process.toStrin g());
} catch (Exception e) {
e.printStackTra ce();
}
}

}

i tried this code it didn't change the code . can any one tell how to change the system date with java application ?

[JosAH]

What *did* it do? What was the completion code of the process? Any exceptions
thrown? Is the effective user allowed to change the system date?

kind regards,

Jos

[ksrashmi]

no exception thrown it is executing the code but it is not chaning the date .

for chaning the date we need to have root permision . may be beacuse of that it is not executing .

i tried with this command also

String command = "date -s 'Sat May 24 14:43:00 PDT 2005' "; in place of
String command = "date 07212008'

[JosAH]

no exception thrown it is executing the code but it is not chaning the date .

for chaning the date we need to have root permision . may be beacuse of that it is not executing .

Sure, you have to be root to change the system date so you have to run your
little program with an effective uid set to root.

kind regards,

Jos

[samido]

I am not sure what this suppose to do but the type of exception is as follow, somebody please help out so that we can all learn this thign

java.io.IOExcep tion: Cannot run program "date": CreateProcess error=2, The system cannot find the file specified
at java.lang.Proce ssBuilder.start (Unknown Source)
at java.lang.Runti me.exec(Unknown Source)
at java.lang.Runti me.exec(Unknown Source)
at java.lang.Runti me.exec(Unknown Source)
at Test.main(Test. java:16)
Caused by: java.io.IOExcep tion: CreateProcess error=2, The system cannot find the file specified
at java.lang.Proce ssImpl.create(N ative Method)
at java.lang.Proce ssImpl.<init>(U nknown Source)
at java.lang.Proce ssImpl.start(Un known Source)
... 5 more

kind regarde:

Sam Rabophala

[ksrashmi]

i have changed the class file user as root but still it is not working .
anything else i need to do ?

Sure, you have to be root to change the system date so you have to run your
little program with an effective uid set to root.

kind regards,

Jos

[ksrashmi]

i tried by writing the one shell script with root permision .

# Author: Rashmi
# date : 01-07-2005

date -s 'May 12 2008'


and calling that one with java code

public class LinuxJava {
public static void main(String[] args) {
try {
String command = "/home/rashmi/test.sh ";
final Process process = Runtime.getRunt ime().exec(comm and);

// int returnCode = process.waitFor ();
// process.toStrin g()
System.out.prin tln("Return code = " + process.toStrin g());

} catch (Exception e) {
e.printStackTra ce();
}
}

}


it is also executing .. but not chaning the date :(

[JosAH]

i tried by writing the one shell script with root permision .

[ ... ]

it is also executing .. but not chaning the date :(

If you run that script manually, does it change the date?

kind regards,

Jos

[ksrashmi]

now i am able to change the date , i changed the tomcat user to root . and script user to root . now it started working .
thanks

[r035198x]

now i am able to change the date , i changed the tomcat user to root . and script user to root . now it started working .
thanks

Oh so Tomcat was involved in all this? I didn't pick that up from your ealier posts in this thread.

[ksrashmi]

i wanted do this either by the stand alone java program or from the application .
after chaning the tomcat to root user , i called the java program program from jsp . then it started working .

[pradeepkhyd07]

hi ksrashmi,

can you please paste the content that was there in
/home/rashmi/test.sh.

Thanks,
Pradeep.