fix: deprecate support for MySQL connector/J 5 (#1278)

Fixes #1243 

Co-authored-by: Eno Compton <enocom@google.com>

jdbc/mysql-j-5/pom.xml

@@ -37,6 +37,19 @@
     SSL certificates manually.
   </description>
 
+  <distributionManagement>
+    <relocation>
+      <groupId>com.google.cloud.sql</groupId>
+      <artifactId>mysql-socket-factory-connector-j-8</artifactId>
+      <version>1.11.1-SNAPSHOT</version>
+      <message>
+       MySQL Connector/J 5.0.x is no longer under development and has significant security vulnerabilities.
+       Please update to 8.0.x instead. See the following GitHub issue for more details: 
+       https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory/issues/1243
+     </message>
+    </relocation>
+  </distributionManagement>
+
   <properties>
     <assembly.skipAssembly>false</assembly.skipAssembly>
   </properties>

jdbc/mysql-j-5/src/main/java/com/google/cloud/sql/mysql/SocketFactory.java

@@ -20,6 +20,7 @@
 import java.io.IOException;
 import java.net.Socket;
 import java.util.Properties;
+import java.util.logging.Logger;
 
 /**
  * A MySQL {@link SocketFactory} that establishes a secure connection to a Cloud SQL instance using
@@ -37,6 +38,12 @@ public class SocketFactory implements com.mysql.jdbc.SocketFactory {
 
   @Override
   public Socket connect(String hostname, int portNumber, Properties props) throws IOException {
+    Logger logger = Logger.getLogger(SocketFactory.class.getName());
+    logger.warning(
+        "MySQL Connector/J 5.0.x is no longer under development"
+            + " and has significant security vulnerabilities."
+            + " Please update to 8.0.x instead. See the following GitHub issue for more details:"
+            + " https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory/issues/1243");
     try {
       socket = CoreSocketFactory.connect(props);
     } catch (InterruptedException e) {