PROTON-2852 Remove the experimental Netty 5 support

Removes current experimental Netty 5 code as that has stopped evolving
and current code won't work with the long unreleased netty 5 branch
code.

pom.xml

@@ -48,7 +48,6 @@
     <hamcrest.version>3.0</hamcrest.version>
     <netty.version>4.1.113.Final</netty.version>
     <netty.iouring.version>0.0.25.Final</netty.iouring.version>
-    <netty5.version>5.0.0.Alpha5</netty5.version>
     <netty.tcnative.version>2.0.66.Final</netty.tcnative.version>
 
     <!-- Plugin versions -->
@@ -64,11 +63,6 @@
     <netty-transport-native-epoll-classifier>linux-x86_64</netty-transport-native-epoll-classifier>
     <netty-transport-native-kqueue-classifier>osx-x86_64</netty-transport-native-kqueue-classifier>
 
-    <netty5-scope>provided</netty5-scope>
-    <netty5-transport-native-io-uring-classifier>linux-x86_64</netty5-transport-native-io-uring-classifier>
-    <netty5-transport-native-epoll-classifier>linux-x86_64</netty5-transport-native-epoll-classifier>
-    <netty5-transport-native-kqueue-classifier>osx-x86_64</netty5-transport-native-kqueue-classifier>
-
     <!-- surefire forked jvm arguments -->
     <argLine>-Xmx2g -enableassertions ${jacoco-config}</argLine>
 
@@ -170,44 +164,6 @@
         <version>${netty.iouring.version}</version>
         <classifier>${netty-transport-native-io-uring-classifier}</classifier>
       </dependency>
-      <!--  Netty 5 Dependencies-->
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-buffer</artifactId>
-        <version>${netty5.version}</version>
-      </dependency>
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-common</artifactId>
-        <version>${netty5.version}</version>
-      </dependency>
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-handler</artifactId>
-        <version>${netty5.version}</version>
-      </dependency>
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-transport</artifactId>
-        <version>${netty5.version}</version>
-      </dependency>
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-codec-http</artifactId>
-        <version>${netty5.version}</version>
-      </dependency>
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-transport-native-epoll</artifactId>
-        <version>${netty5.version}</version>
-        <classifier>${netty-transport-native-epoll-classifier}</classifier>
-      </dependency>
-      <dependency>
-        <groupId>io.netty</groupId>
-        <artifactId>netty5-transport-native-kqueue</artifactId>
-        <version>${netty5.version}</version>
-        <classifier>${netty-transport-native-kqueue-classifier}</classifier>
-      </dependency>
       <!--  Testing only Uber Jar inclusion -->
       <dependency>
          <groupId>io.netty</groupId>

protonj2-client/pom.xml

@@ -83,44 +83,6 @@
       <classifier>${netty-transport-native-kqueue-classifier}</classifier>
       <scope>${netty-scope}</scope>
     </dependency>
-    <!-- Netty 5 Development dependencies -->
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-buffer</artifactId>
-      <scope>${netty5-scope}</scope>
-    </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-common</artifactId>
-      <scope>${netty5-scope}</scope>
-    </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-handler</artifactId>
-      <scope>${netty5-scope}</scope>
-    </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-transport</artifactId>
-      <scope>${netty5-scope}</scope>
-    </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-codec-http</artifactId>
-      <scope>${netty5-scope}</scope>
-    </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-transport-native-epoll</artifactId>
-      <classifier>${netty-transport-native-epoll-classifier}</classifier>
-      <scope>${netty5-scope}</scope>
-    </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty5-transport-native-kqueue</artifactId>
-      <classifier>${netty5-transport-native-kqueue-classifier}</classifier>
-      <scope>${netty5-scope}</scope>
-    </dependency>
     <!-- Test dependencies -->
     <dependency>
       <groupId>org.apache.qpid</groupId>

protonj2-client/src/main/java/org/apache/qpid/protonj2/client/transport/IOContext.java

@@ -21,8 +21,6 @@
 import org.apache.qpid.protonj2.client.TransportOptions;
 import org.apache.qpid.protonj2.client.transport.netty4.Netty4IOContext;
 import org.apache.qpid.protonj2.client.transport.netty4.Netty4Support;
-import org.apache.qpid.protonj2.client.transport.netty5.Netty5IOContext;
-import org.apache.qpid.protonj2.client.transport.netty5.Netty5Support;
 import org.apache.qpid.protonj2.engine.Scheduler;
 
 /**
@@ -69,8 +67,6 @@ public interface IOContext {
     static IOContext create(TransportOptions options, SslOptions sslOptions, String ioThreadName) {
         if (Netty4Support.isAvailable()) {
             return new Netty4IOContext(options, sslOptions, ioThreadName);
-        } else if (Netty5Support.isAvailable()) {
-            return new Netty5IOContext(options, sslOptions, ioThreadName);
         }
 
         throw new UnsupportedOperationException("Netty not available on the class path");