Thread: Re: [Php-java-bridge-users] Return Boolean from Java to PHP

By the way.  When I call the validation method from a command line java 
program, it works perfectly.

Charles Shaffer
Senior Analyst
NTN-Bower Corporation




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        Subject:        [Php-java-bridge-users] Return Boolean from Java to PHP


How do you return a boolean value from a java routine to a php module? 

I have a java method that validates an account number and returns true or 
false.  The Java declaration is 

public Boolean isValidAccountNumber(String acctnum) {

in the method I         return true;    or      return false;

In the php code I check it like this

if ($IDEAS->isValidAccountNumber($acctnum) == false) {

No matter what I do, it always acts as if the return value was true.  Even 

when I force the Java method to always return false;

Is this a type issue?
 
Charles Shaffer
Senior Analyst
NTN-Bower Corporation
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>>Try:

>>$res = (bool) $IDEAS->isValidAccountNumber($acctnum) ;
>>if ($res === false) {

I tried 
$result = (bool)$IDEAS->isValidAccountNumber($acctnum);
echo "result = $result";

And got
result = 1 

This can't be correct because I set up the isValidAccountNumber function 
to always return false. 

I tried
$result = $IDEAS->isValidAccountNumber($acctnum);
echo "result = $result";

And got
result = [[o:Boolean]:"false"]

At least false is in there somewhere.  I guess the question I should be 
asking is how do I extract the value from the Boolean object returned by 
Java?

When I try
$resval = $result->value;
echo "resval = $resval";

It takes a dump
Error [[o:Exception]:"java.lang.Exception: GetProperty failed: 
[[o:Boolean]]->value. 
Cause: java.lang.NoSuchFieldException: value (with args:). 

If not value, then what?

Charles Shaffer
Senior Analyst
NTN-Bower Corporation

Just try:

// Notice the !
if(!$res){
   ...
}

On Wed, Sep 3, 2008 at 9:05 AM, <php...@li...
> wrote:

> >>Try:
>
> >>$res = (bool) $IDEAS->isValidAccountNumber($acctnum) ;
> >>if ($res === false) {
>
> I tried
> $result = (bool)$IDEAS->isValidAccountNumber($acctnum);
> echo "result = $result";
>
> And got
> result = 1
>
> This can't be correct because I set up the isValidAccountNumber function
> to always return false.
>
> I tried
> $result = $IDEAS->isValidAccountNumber($acctnum);
> echo "result = $result";
>
> And got
> result = [[o:Boolean]:"false"]
>
> At least false is in there somewhere.  I guess the question I should be
> asking is how do I extract the value from the Boolean object returned by
> Java?
>
> When I try
> $resval = $result->value;
> echo "resval = $resval";
>
> It takes a dump
> Error [[o:Exception]:"java.lang.Exception: GetProperty failed:
> [[o:Boolean]]->value.
> Cause: java.lang.NoSuchFieldException: value (with args:).
>
> If not value, then what?
>
> Charles Shaffer
> Senior Analyst
> NTN-Bower Corporation
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
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> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
>



-- 
Roger José Padilla Camacho

I had a similar problem and I use java_values() to solve, try :

if( java_values($IDEAS->isValidAccountNumber($acctnum)) ){
...
}

Hope this Help,
Benjamin.

php...@li... a écrit :
>>> Try:
>>>       
>
>   
>>> $res = (bool) $IDEAS->isValidAccountNumber($acctnum) ;
>>> if ($res === false) {
>>>       
>
> I tried 
> $result = (bool)$IDEAS->isValidAccountNumber($acctnum);
> echo "result = $result";
>
> And got
> result = 1 
>
> This can't be correct because I set up the isValidAccountNumber function 
> to always return false. 
>
> I tried
> $result = $IDEAS->isValidAccountNumber($acctnum);
> echo "result = $result";
>
> And got
> result = [[o:Boolean]:"false"]
>
> At least false is in there somewhere.  I guess the question I should be 
> asking is how do I extract the value from the Boolean object returned by 
> Java?
>
> When I try
> $resval = $result->value;
> echo "resval = $resval";
>
> It takes a dump
> Error [[o:Exception]:"java.lang.Exception: GetProperty failed: 
> [[o:Boolean]]->value. 
> Cause: java.lang.NoSuchFieldException: value (with args:). 
>
> If not value, then what?
>
> Charles Shaffer
> Senior Analyst
> NTN-Bower Corporation
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
>   

>>Just try:

>>// Notice the !
>>if(!$res){
>>   ...
>>}

Same thing.

Charles Shaffer
Senior Analyst
NTN-Bower Corporation

That's so strange... in PHP the number 1 is like true, that also not works
for you?


On Wed, Sep 3, 2008 at 9:37 AM, <php...@li...
> wrote:

> >>Just try:
>
> >>// Notice the !
> >>if(!$res){
> >>   ...
> >>}
>
> Same thing.
>
> Charles Shaffer
> Senior Analyst
> NTN-Bower Corporation
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
>



-- 
Roger José Padilla Camacho

>>That's so strange... in PHP the number 1 is like true, that also not 
works
>>for you?

I believe the problem is that after the call, $res contains a Java Boolean 
object, not the boolean value of 0 or 1.  I am trying the java_values 
approach now.

Charles Shaffer
Senior Analyst
NTN-Bower Corporation

Benjamin wrote:
>>I had a similar problem and I use java_values() to solve, try :

>>if( java_values($IDEAS->isValidAccountNumber($acctnum)) ){

That was it.  Thanks so much Benjamin. 

Charles Shaffer
Senior Analyst
NTN-Bower Corporation

Of course, the error is in the method declaration, see:

*public Boolean isValidAccountNumber(String acctnum) { *


Java is performing an automatic typecasting from native boolean to object
java.lang.Boolean.


You must change your method declaration by (notice the native boolean):

*public boolean isValidAccountNumber(String acctnum) {*


Please test this change and give your feedback.


Greetings from Cartagena / Colombia
--
Roger Padilla


On Wed, Sep 3, 2008 at 9:57 AM, <php...@li...
> wrote:

> Benjamin wrote:
> >>I had a similar problem and I use java_values() to solve, try :
>
> >>if( java_values($IDEAS->isValidAccountNumber($acctnum)) ){
>
> That was it.  Thanks so much Benjamin.
>
> Charles Shaffer
> Senior Analyst
> NTN-Bower Corporation
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
>



-- 
Roger José Padilla Camacho

Hi,

> Of course, the error is in the method declaration

Not really.


> *public Boolean isValidAccountNumber(String acctnum) { *
> *public boolean isValidAccountNumber(String acctnum) {*

from the PHP/Java Bridge's point of view both are equivalent, unless you define 

  define ("JAVA_PREFER_VALUES", 1);

before including java/Java.inc. The JAVA_PREFER_VALUES forces a round-trip for each primitive return value.


Regards,
Jost Boekemeier

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Roger says:
>>You must change your method declaration by (notice the native boolean):

>>*public boolean isValidAccountNumber(String acctnum) {*

Thank you.  I will try this when I get a chance and let you know.  Since 
it is working, I have moved to another assignment, but when I get time I 
will try this.  I appreciate the information.  I wasn't aware of the 
difference between boolean and Boolean.

Charles Shaffer
Senior Analyst
NTN-Bower Corporation

Try:

$res = (bool) $IDEAS->isValidAccountNumber($acctnum) ;
if ($res === false) {


On Tue, Sep 2, 2008 at 2:20 PM, <php...@li...
> wrote:

> By the way.  When I call the validation method from a command line java
> program, it works perfectly.
>
> Charles Shaffer
> Senior Analyst
> NTN-Bower Corporation
>
>
>
>
> php...@li...
> Sent by: php...@li...
> 09/02/2008 02:16 PM
> Please respond to php-java-bridge-users
>
>
>        To:     php...@li...
>        cc:
>        Subject:        [Php-java-bridge-users] Return Boolean from Java to
> PHP
>
>
> How do you return a boolean value from a java routine to a php module?
>
> I have a java method that validates an account number and returns true or
> false.  The Java declaration is
>
> public Boolean isValidAccountNumber(String acctnum) {
>
> in the method I         return true;    or      return false;
>
> In the php code I check it like this
>
> if ($IDEAS->isValidAccountNumber($acctnum) == false) {
>
> No matter what I do, it always acts as if the return value was true.  Even
>
> when I force the Java method to always return false;
>
> Is this a type issue?
>
> Charles Shaffer
> Senior Analyst
> NTN-Bower Corporation
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the
> world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
>
> --
> This email was Anti Virus checked by Astaro Security Gateway.
> http://www.astaro.com
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> php-java-bridge-users mailing list
> php...@li...
> https://lists.sourceforge.net/lists/listinfo/php-java-bridge-users
>



-- 
Roger José Padilla Camacho

Hi,

> Try:
> $res = (bool) $IDEAS->isValidAccountNumber($acctnum) ;

No! PHP automatically casts a primitive value into a boolean, if it is part of the boolean expression.  However, you cannot convert a PHP object into PHP value using a type cast. The only exception is the (string) type cast, which internally calls $res->__toString()[1]. 

Therefore the PHP/Java Bridge library contains two special procedures, one to fetch a PHP value from a Java object, the other one to cast a Java object into a PHP primitive type. Please see our documentation for details.



Regards,
Jost Boekemeier

[1] PHP's behaviour is insane, of course. In order to convert the following PHP object into a value one needs two type casts:

class Clazz_ONE {
  function __toString() { return "1"; }
}
$one = new Clazz_ONE();
var_dump( (int) $one) 
=> ERROR

var_dump( (int)(string) $one)
=> 1



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