<p>From debian bugreport <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892538" rel="nofollow">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892538</a></p>
<pre><code>Source: kamailio
Severity: serious
Tags: sid buster
User: debian-gcc@lists.debian.org
Usertags: gcj-rm

Hi,

kamailio depends or build-depends on GCJ. GCJ has been dropped
upstream since GCC 7, so we are dropping it from Debian. Thus please
either drop support for GCJ if you are just building an alternative
package with GCJ support (e.g. ant-gcj, ecj-gcj) or switch to
default-jdk / default-jre as appropriate.

Cheers, Emilio 
</code></pre>
<p>From <a href="https://gcc.gnu.org/gcc-7/changes.html" rel="nofollow">https://gcc.gnu.org/gcc-7/changes.html</a></p>
<pre><code>Java (GCJ)

The GCC Java frontend and associated libjava runtime library have been removed from GCC.
</code></pre>
<p>Can the <code>app_java</code> module be built with openjdk-9-jdk?</p>

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