Re: Runtime ClassCastException on class org.apache.xerces.dom.ElementNSImpl

--00000000000076314706065d4620
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Thanks for the reply. For the record I confirmed this error happens on
xercesImpl-2.12.2.jar.

While I too am somewhat amazed this cast ever worked, it did actually work
for 10 years starting on this Rampart commit below.

"
commit b73690eefaad9027bb9633a20e29a218a1021cc9 (HEAD -> master)
Author: Amila Jayasekara <[email protected]>
Date:   Thu Mar 8 08:11:32 2012 +0000

   Refactored SAML2TokenIssuer and cleaned up code. Created a test
framework to write unit tests for trust scenarios. Fixed documentation
errors. Reduced code duplication. Added more tests.
"

I see that OMNode at runtime ends up being an Axiom class
DOOMNSAwareElementImpl
that "extends CoreElementImpl" , which implements "org.w3c.dom.Element" -
that to me explains why it compiles.

So, this is a runtime issue on code that worked fine for a long time.

Before I figure out how to rewrite the code in question as I'm not really
sure, I thought I'd ask why this happened all of sudden on the Xerces side
as I have no clue on the Axiom side.


On Wed, Sep 27, 2023 at 9:03=E2=80=AFAM Rick Brown <[email protected]> wro=
te:

> Ill throe this in, but i might be out in left field (or iut in da weeds)
> But this is a difference between axiom and DOM
> When working with JAXB and axis2 we had to be very specific as to which
> "space" we were in
> Axiom or DOM
>
> you cant just cast between them
>
> Rick Brown
>
> On Wednesday, September 27, 2023 at 01:30:53 PM CDT, robertlazarski <
> [email protected]> wrote:
>
>
> I'm the VP of the Apache Axis project and on the PMC of the Apache Axiom
> project, and I am trying to upgrade the Axis sub project Apache Rampart
> project - last released in 2017 - to modern dependencies.
>
> My environment is JDK 17 on Linux with a compiler target of JDK 11.
>
> I mention all this because I have a Rampart unit test that I am trying to
> fix. The code compiles fine, git history shows this code has no recent
> changes in the area and just always worked.
>
> However, there is now a ClassCastException running a unit test when
> casting as shown.
>
> import org.apache.axiom.om.OMElement;
> import org.apache.axiom.om.OMNode;
> import org.w3c.dom.Element;
>
> // defined as <wst:RequestedSecurityToken>
> OMElement requestedSecurityTokenElement =3D ...
> // OpenSAML assertion defined as <saml> with org.w3c.dom.Element
> Element assertionElement =3D assertion.getDOM();
> // Boom!
> requestedSecurityTokenElement.addChild((OMNode)assertionElement);
>
> Error:
>
> java.lang.ClassCastException: class org.apache.xerces.dom.ElementNSImpl
> cannot be cast to class org.apache.axiom.om.OMNode
> (org.apache.xerces.dom.ElementNSImpl and org.apache.axiom.om.OMNode are i=
n
> unnamed module of loader 'app')
>        at
> org.apache.rahas.impl.SAML2TokenIssuer.createRequestSecurityTokenResponse=
(SAML2TokenIssuer.java:242)
>
> The code is here.
>
>
> https://github.com/apache/axis-axis2-java-rampart/blob/master/modules/ram=
part-trust/src/main/java/org/apache/rahas/impl/SAML2TokenIssuer.java#L242
>
> I tried asking the most prolific Axiom developer for help in the issue
> below a few weeks ago but got no response.
>
> https://issues.apache.org/jira/browse/RAMPART-449
>
> I am asking here because I am stuck and need some type of guidance.
>

--00000000000076314706065d4620
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><span style=3D"font-family:monospace"><span style=3D"=
color:rgb(0,0,0);background-color:rgb(255,255,255)">Thanks for the reply. F=
or the record I confirmed this error happens on xercesImpl-2.12.2.jar. <br>=
</span></span></div><div><span style=3D"font-family:monospace"><span style=
=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)"><br></span></span><=
/div><div><span style=3D"font-family:monospace"><span style=3D"color:rgb(0,=
0,0);background-color:rgb(255,255,255)">While I too am somewhat amazed this=
 cast ever worked, it did actually work for 10 years starting on this Rampa=
rt commit below.</span></span></div><div><span style=3D"font-family:monospa=
ce"><span style=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)"><br>=
</span></span></div><div><span style=3D"font-family:monospace"><span style=
=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)">&quot;<br></span></=
span></div><div><div><span style=3D"font-family:monospace"><span style=3D"c=
olor:rgb(178,104,24);background-color:rgb(255,255,255)">commit b73690eefaad=
9027bb9633a20e29a218a1021cc9 (</span><span style=3D"font-weight:bold;color:=
rgb(84,255,255);background-color:rgb(255,255,255)">HEAD -&gt; </span><span =
style=3D"font-weight:bold;color:rgb(84,255,84);background-color:rgb(255,255=
,255)">master</span><span style=3D"color:rgb(178,104,24);background-color:r=
gb(255,255,255)">)</span><span style=3D"color:rgb(0,0,0);background-color:r=
gb(255,255,255)">
</span><br>Author: Amila Jayasekara &lt;<a href=3D"mailto:[email protected]=
" target=3D"_blank">[email protected]</a>&gt;
<br>Date: =C2=A0=C2=A0Thu Mar 8 08:11:32 2012 +0000
<br>
<br> =C2=A0=C2=A0=C2=A0Refactored SAML2TokenIssuer and cleaned up code. Cre=
ated a test framework to write unit tests for trust scenarios. Fixed docume=
ntation errors. Reduced code duplication. Added more tests.</span></div><di=
v><span style=3D"font-family:monospace">&quot;</span></div><div><span style=
=3D"font-family:monospace"><br></span></div></div><div><span style=3D"font-=
family:monospace"><span style=3D"color:rgb(0,0,0);background-color:rgb(255,=
255,255)">I see that OMNode at runtime ends up being an Axiom class </span>=
</span><span style=3D"font-family:monospace"><span style=3D"color:rgb(0,0,0=
);background-color:rgb(255,255,255)">DOOMNSAwareElementImpl that &quot;</sp=
an><span style=3D"color:rgb(135,255,175);background-color:rgb(255,255,255)"=
>extends</span><span style=3D"color:rgb(0,0,0);background-color:rgb(255,255=
,255)"> CoreElementImpl&quot; , which implements &quot;</span></span><span =
style=3D"font-family:monospace"><span style=3D"color:rgb(0,0,0);background-=
color:rgb(255,255,255)">org.w3c.dom.Element&quot; - that to me explains why=
 it compiles. </span><br></span><br></div><div><span style=3D"font-family:m=
onospace"><span style=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)=
">So, this is a runtime issue on code that worked fine for a long time.=C2=
=A0</span></span></div><div><span style=3D"font-family:monospace"><span sty=
le=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)"><br></span></span=
></div><div><span style=3D"font-family:monospace"><span style=3D"color:rgb(=
0,0,0);background-color:rgb(255,255,255)">Before I figure out how to rewrit=
e the code in question as I&#39;m not really sure, I thought I&#39;d ask wh=
y this happened all of sudden on the Xerces side as I have no clue on the A=
xiom side. =C2=A0 </span></span></div><br><div><span style=3D"font-family:m=
onospace"></span></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Wed, Sep 27, 2023 at 9:03=E2=80=AFAM Rick Brown &=
lt;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]=
et</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div><div style=3D"font-family:Helvetica Neue,Helvetica,Arial,sans-serif;=
font-size:16px"><div></div>
        <div>Ill throe this in, but i might be out in left field (or iut in=
 da weeds)</div><div>But this is a difference between axiom and DOM</div><d=
iv>When working with JAXB and axis2 we had to be very specific as to which =
&quot;space&quot; we were in</div><div>Axiom or DOM</div><div><br></div><di=
v>you cant just cast between them</div><div><br></div><div>Rick Brown</div>=
<div><br></div>
       =20
        <div id=3D"m_-5365263205531194603m_3558140001034825098ydp81f5c5e9ya=
hoo_quoted_6628126962">
            <div style=3D"font-family:&quot;Helvetica Neue&quot;,Helvetica,=
Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
               =20
                <div>
                    On Wednesday, September 27, 2023 at 01:30:53 PM CDT, ro=
bertlazarski &lt;<a href=3D"mailto:[email protected]" target=3D"_bla=
nk">[email protected]</a>&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"m_-5365263205531194603m_3558140001034825098=
ydp81f5c5e9yiv8636611883"><div dir=3D"ltr"><div>I&#39;m the VP of the Apach=
e Axis project and on the PMC of the Apache Axiom project, and I am trying =
to upgrade the Axis sub project Apache Rampart project - last released in 2=
017 - to modern dependencies. <br></div><div><br></div><div>My environment =
is JDK 17 on Linux with a compiler target of JDK 11.=C2=A0</div><div>=C2=A0=
<br></div><div>I mention all this because I have a Rampart unit test that I=
 am trying to fix. The code compiles fine, git history shows this code has =
no recent changes in the area and just always worked.=C2=A0</div><div><br><=
/div><div>However, there is now a ClassCastException running a unit test wh=
en casting as shown.=C2=A0</div><div><br></div><div><span style=3D"font-fam=
ily:monospace"><span style=3D"color:rgb(95,215,255);background-color:rgb(25=
5,255,255)">import</span><span style=3D"color:rgb(0,0,0);background-color:r=
gb(255,255,255)"> org.apache.axiom.om.OMElement;</span></span></div><div><d=
iv><span style=3D"font-family:monospace"><span style=3D"color:rgb(0,0,0);ba=
ckground-color:rgb(255,255,255)"></span></span></div><div><span style=3D"fo=
nt-family:monospace"><span style=3D"color:rgb(95,215,255);background-color:=
rgb(255,255,255)">import</span><span style=3D"color:rgb(0,0,0);background-c=
olor:rgb(255,255,255)"> org.apache.axiom.om.OMNode;</span><br></span></div>=
</div><div><span style=3D"font-family:monospace"><span style=3D"color:rgb(9=
5,215,255);background-color:rgb(255,255,255)">import</span><span style=3D"c=
olor:rgb(0,0,0);background-color:rgb(255,255,255)"> org.w3c.dom.Element;</s=
pan></span></div><div><span style=3D"font-family:monospace"><span style=3D"=
color:rgb(0,0,0);background-color:rgb(255,255,255)"><br></span></span></div=
><div>// <font color=3D"#000000">defined as &lt;wst:RequestedSecurityT</fon=
t>oken&gt;</div><div><span style=3D"font-family:monospace"><span style=3D"c=
olor:rgb(0,0,0);background-color:rgb(255,255,255)">OMElement requestedSecur=
ityTokenElement =3D </span>...</span></div><div>// OpenSAML assertion defin=
ed as &lt;saml&gt; <font color=3D"#000000">with org.w3c.dom.Element</font> =
</div><div><span style=3D"font-family:monospace"><span style=3D"color:rgb(0=
,0,0);background-color:rgb(255,255,255)">Element assertionElement =3D asser=
tion.getDOM();</span><br></span></div><div>// Boom! <br></div><div><span st=
yle=3D"font-family:monospace"><span style=3D"color:rgb(0,0,0);background-co=
lor:rgb(255,255,255)">requestedSecurityTokenElement.addChild((OMNode)assert=
ionElement);</span><br></span></div><div><span style=3D"font-family:monospa=
ce"><br></span></div><div><span style=3D"font-family:monospace">Error: <br>=
</span></div><div><p><font color=3D"#000000">java.lang.ClassCast</font><fon=
t color=3D"#000000">Exce</font><font color=3D"#000000">ption: class org.apa=
che.xerces.dom.ElementNSImpl can</font>not
 be cast to class org.apache.axiom.om.OMNode=20
(org.apache.xerces.dom.ElementNSImpl and org.apache.axiom.om.OMNode are=20
in unnamed module of loader &#39;app&#39;) <br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0at org.apache.rahas.impl.SAML2Tok=
enIssuer.createRequestSecurityTokenResponse(SAML2TokenIssuer.java:242)</p>


<p>The code is here. </p>

<p><a href=3D"https://github.com/apache/axis-axis2-java-rampart/blob/master=
/modules/rampart-trust/src/main/java/org/apache/rahas/impl/SAML2TokenIssuer=
.java#L242" rel=3D"nofollow" target=3D"_blank">https://github.com/apache/ax=
is-axis2-java-rampart/blob/master/modules/rampart-trust/src/main/java/org/a=
pache/rahas/impl/SAML2TokenIssuer.java#L242</a> <br></p><p>I tried asking t=
he most prolific Axiom developer for help in the issue below a few weeks ag=
o but got no response. <br></p><p><a href=3D"https://issues.apache.org/jira=
/browse/RAMPART-449" rel=3D"nofollow" target=3D"_blank">https://issues.apac=
he.org/jira/browse/RAMPART-449</a></p><p>I am asking here because I am stuc=
k and need some type of guidance. <br></p></div></div>
</div></div>
            </div>
        </div></div></div></blockquote></div>

--00000000000076314706065d4620--