return result to php

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Rose - 31 Jan 2008 10:37 GMT

When I call

system('/mnt/hd9/a.out');

the prog sucessfully print a message to web browser. (a.out is an object
file compiled from a C file).

But when I change it to java, nothing generates. Should I change
System.out.println to some other functions?

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Rose - 31 Jan 2008 11:29 GMT

> When I call
>
[quoted text clipped - 5 lines]
> But when I change it to java, nothing generates. Should I change
> System.out.println to some other functions?

the error is like this:

SearchDatabase4.java
74: Class.forName("com.mysql.jdbc.Driver");
344: new SearchDatabase4(args[0], Double.parseDouble(args[1]),

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at
java.net.URLClassLoader$1.run(URLClassLoader.java:200) at
java.security.AccessController.doPrivileged(Native Method) at
java.net.URLClassLoader.findClass(URLClassLoader.java:188) at
java.lang.ClassLoader.loadClass(ClassLoader.java:306) at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) at
java.lang.ClassLoader.loadClass(ClassLoader.java:251) at
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at
java.lang.Class.forName0(Native Method) at
java.lang.Class.forName(Class.java:169) at
SearchDatabase4.(SearchDatabase4.java:74) at
SearchDatabase4.main(SearchDatabase4.java:344)

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RedGrittyBrick - 31 Jan 2008 11:41 GMT

>> When I call
>>
[quoted text clipped - 4 lines]
>>
>> But when I change it to java, nothing generates.

but what does your system() call look like?

> Should I change System.out.println to some other functions?

No.

> the error is like this:
>
[quoted text clipped - 3 lines]
>
> java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at

A ClassNotFoundException means that Java cannot find the
com.mysql.jdbc.Driver class. I guess you need to tell Java the location
of a Jar file that contains the MySQL drivers.

See
http://mindprod.com/jgloss/jar.html#TIPS
http://mindprod.com/jgloss/classpath.html#JAR

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Lew - 31 Jan 2008 15:46 GMT

Rose wrote:

>>> When I call
>>>
[quoted text clipped - 4 lines]
>>>
>>> But when I change it to java, nothing generates.

It's spelled "Java". When you change what to Java, exactly? How are you
invoking this Java code? Surely you are not trying to use it as a CGI program?

>> Should I change System.out.println to some other functions?

> No.

Yes!

System.out.println() in a JavaEE web app does not write to the client. In a
Java CGI app it would, but that would be a very, very silly architecture.

Signature

Lew

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Arne Vajhøj - 01 Feb 2008 02:37 GMT

> Rose wrote:
>>>> When I call
[quoted text clipped - 19 lines]
> In a Java CGI app it would, but that would be a very, very silly
> architecture.

No !!

http://www.php.net/manual/en/function.system.php

Arne

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Arne Vajhøj - 01 Feb 2008 02:38 GMT

>> Rose wrote:
>>>>> When I call
[quoted text clipped - 23 lines]
>
> http://www.php.net/manual/en/function.system.php

The point being that is is not Java EE or Java as CGI but
PHP calling a standard Java SE app.

Arne

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Lew - 01 Feb 2008 02:44 GMT

Lew wrote:

>>> System.out.println() in a JavaEE web app does not write to the
>>> client. In a Java CGI app it would, but that would be a very, very
>>> silly architecture.

>> No !!
>>
>> http://www.php.net/manual/en/function.system.php
>
> The point being that is is not Java EE or Java as CGI but
> PHP calling a standard Java SE app.

So when the OP said, "... when I change it to Java" they meant the called
program, not the PHP code?

I thought they meant when they use Java as the web app, eliminating the need
for PHP or C.

The other way, you are correct, of course.

Signature

Lew

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Gordon Beaton - 31 Jan 2008 11:44 GMT

> When I call
>
> system('/mnt/hd9/a.out');
>
> the prog sucessfully print a message to web browser. (a.out is an
> object file compiled from a C file).

Some context would help here...

Where are you making this call?

> But when I change it to java, nothing generates. Should I change
> System.out.println to some other functions?

Please define "change it to java".

Did you replace a.out with a Java program? Or did you replace system()
with Runtime.getRuntime().exec("/mnt/hd9/a.out")?

In your other message you posted a stack dump, but here you only said
"nothing generates" and failed to mention JDBC or mysql or even
anything really. The error message seems to indicate classpath
problems, for whatever that's worth.

The help you get is only as good as the information you provide.

/gordon

--

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return result to php

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