[jira] Created: (XMLRPC-129) typecast errors when arrays are returned

["kamin (JIRA)" <xm...@ws.apache.org>]

typecast errors when arrays are returned
----------------------------------------

                 Key: XMLRPC-129
                 URL: http://issues.apache.org/jira/browse/XMLRPC-129
             Project: XML-RPC
          Issue Type: Bug
          Components: Source
    Affects Versions: 3.0
         Environment: linux, java 1.4.2
            Reporter: kamin



Java throws a ClassCastException when an array return value is cast to a typed array, for XML-RPC functions that return arrays.

For example, the function

public Integer[] foo(Integer[] val){ return val; }

will work fine with the following client code:

Integer[] param = new Integer[5];
Object[] result = (Object[])server.execute("Server.foo", param);

But the following will throw a class cast exception

Integer[] param = new Integer[5];
Integer[] result = (Integer[])server.execute("Server.foo", param);


This error was first documented on the mailing list in this thread:
http://mail-archives.apache.org/mod_mbox/ws-xmlrpc-dev/200609.mbox/%3c19c34bd10609220214g170174e2mdb9082f1aacb0537@mail.gmail.com%3e

The response to the email suggests that this should be easy to fix.

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Re: [jira] Created: (XMLRPC-129) typecast errors when arrays are returned

[Jochen Wiedmann <jo...@gmail.com>]

On 12/21/06, kamin (JIRA) <xm...@ws.apache.org> wrote:

> For example, the function
>
> public Integer[] foo(Integer[] val){ return val; }
>
> will work fine with the following client code:
>
> Integer[] param = new Integer[5];
> Object[] result = (Object[])server.execute("Server.foo", param);

There's no possibility to get something else than an Object[] unless
you are using the ClientFactory (see the section on "Dynamic Proxies"
in http://ws.apache.org/xmlrpc/advanced.html).


Jochen


-- 
My wife Mary and I have been married for forty-seven years and not
once have we had an argument serious enough to consider divorce;
murder, yes, but divorce, never.
(Jack Benny)

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[jira] Resolved: (XMLRPC-129) typecast errors when arrays are returned

["Jochen Wiedmann (JIRA)" <xm...@ws.apache.org>]

     [ https://issues.apache.org/jira/browse/XMLRPC-129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jochen Wiedmann resolved XMLRPC-129.
------------------------------------

    Resolution: Invalid

I have added the following entry to the FAQ:

    <faq id="arrays">
      <question>Why do I receive a ClassCastException, if the server returns an array?</question>
      <answer>
        <p>The problem is typically caused by code like the following:</p>
        <source><![CDATA[
    Integer[] result = (Integer[])server.execute("Server.foo", param);
        ]]></source>
        <p>The problem is in the fact, that the XML-RPC response tells
          the client, that the server returns an array. It doesn't tell
          what type the array has. In other words, the client will
          always receive an object array. The workaround is to use
          code like the following:</p>
        <source><![CDATA[
    Object[] result = (Integer[])server.execute("Server.foo", param);
    for (int i = 0;  i < result.length;  i++) {
        Integer num = (Integer) result[i];
        ...
    }
        ]]></source>

      </answer> 
    </faq>


> typecast errors when arrays are returned
> ----------------------------------------
>
>                 Key: XMLRPC-129
>                 URL: https://issues.apache.org/jira/browse/XMLRPC-129
>             Project: XML-RPC
>          Issue Type: Bug
>          Components: Source
>    Affects Versions: 3.0
>         Environment: linux, java 1.4.2
>            Reporter: kamin
>
> Java throws a ClassCastException when an array return value is cast to a typed array, for XML-RPC functions that return arrays.
> For example, the function
> public Integer[] foo(Integer[] val){ return val; }
> will work fine with the following client code:
> Integer[] param = new Integer[5];
> Object[] result = (Object[])server.execute("Server.foo", param);
> But the following will throw a class cast exception
> Integer[] param = new Integer[5];
> Integer[] result = (Integer[])server.execute("Server.foo", param);
> This error was first documented on the mailing list in this thread:
> http://mail-archives.apache.org/mod_mbox/ws-xmlrpc-dev/200609.mbox/%3c19c34bd10609220214g170174e2mdb9082f1aacb0537@mail.gmail.com%3e
> The response to the email suggests that this should be easy to fix.

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