<p>While I don't use app_java at all, I did some work to at least get it to build on modern Fedora 27 systems without GCJ and with the following patch and spec: <a href="https://messinet.com/rpms/browser/kamailio/app_java.patch" rel="nofollow">https://messinet.com/rpms/browser/kamailio/app_java.patch</a>, <a href="https://messinet.com/rpms/browser/kamailio/kamailio.spec" rel="nofollow">https://messinet.com/rpms/browser/kamailio/kamailio.spec</a></p>
<p>Though even with that patch it probably my builds probably wouldn't work--the build is filled with lots of incompatible pointer type warnings like the following so the code probably needs some modernizing too.</p>
<pre><code>BUILDSTDERR: java_msgobj.c: In function 'fill_sipmsg_object':
BUILDSTDERR: java_msgobj.c:83:27: warning: passing argument 2 of '(*env)->SetIntField' from incompatible pointer type [-Wincompatible-pointer-types]
BUILDSTDERR:   (*env)->SetIntField(env, SipMsgInstance, fid, msg->id);
</code></pre>

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