ID: 9162
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Open
+Status: Feedback
Bug Type: Java related
Operating System: Linux, RH6.2
PHP Version: 4.0.4pl1
New Comment:
Please test with PHP 4.1.1+JDK 1.2 and report back Thanks.
Previous Comments:
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[2001-02-08 10:58:27] [EMAIL PROTECTED]
Just in case you were confused, the java method getSomething() should
return (String) myhash.get( "myname" ), and the PHP call should be
my_java->getSomething( $my_hash ). You get the idea.
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[2001-02-07 15:28:44] [EMAIL PROTECTED]
This bug is with the Java support in PHP4. PHP seems to try to treat
Java Hashtable objects as PHP-native arrays, with several negative
impacts. First of all, Java Hashtables have no internal concept of
ordering or null termination, nor do they have an internal "current"
pointer. Therefore, if you try to travserse a Java Hashtable as you
would a PHP array, you will run off the end! However, since the
Hashtable is not an object (under PHP), you cannot call $my_hash->get(
"x" ) or $my_hash->put( "y" ).
Second of all, if you try to pass such a Hashtable BACK to a Java class
method, you will find that the Hashtable has been corrupted, and all
your datatypes changed and you will get various NullPointerExceptions
or illegal cast exceptions.
It seems to me the most natural approach at this point would be to just
treat Java Hashtables as generic objects, and therefore retain the
get() and put() methods. That way you don't corrupt the Hashtable, and
you don't let anyone go off the end of any arrays.
I don't know if this kind of thing happens with other Java object
classes.
There is a workaround whereby one can, in Java, explicitly repair a
corrupted Hashtable, but that is pretty ugly. If you are interested in
looking at the workaround, email me.
Here is a code snippet illustrating what I mean:
MyClass.java:
public class MyClass {
public MyClass() { }
public Hashtable makeHash( int ikey, int ival, String skey, String
sval ) {
Hashtable myhash = new Hashtable();
myhash.put( ikey, ival );
myhash.put( skey, sval );
myhash.put( "myname", "joe" );
return myhash;
}
public String getSomething( Hashtable myhash ) {
return myhash.get( "myname" );
}
}
MyPage.php
<?
$my_java = new Java( "MyClass" );
$my_hash = my_java->makeHash( 1,2,"yourname", "steve" );
// watch this:
print( implode( ",", $my_hash ) ); // explosion! off the end of the
array
// or,
print( $my_java->getSomething() ); // java exception!
?>
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Edit this bug report at http://bugs.php.net/?id=9162&edit=1
