Allow connections even if encryption failed to initialize post-1.16.220 (#2147)

This allows Java 16 to still be compatible with Geyser.

connector/pom.xml

@@ -32,7 +32,7 @@
         <dependency>
             <groupId>com.github.CloudburstMC.Protocol</groupId>
             <artifactId>bedrock-v431</artifactId>
-            <version>f8ecf54</version>
+            <version>9947665</version>
             <scope>compile</scope>
             <exclusions>
                 <exclusion>

connector/src/main/java/org/geysermc/connector/utils/LoginEncryptionUtils.java

@@ -60,6 +60,8 @@ import java.util.UUID;
 public class LoginEncryptionUtils {
     private static final ObjectMapper JSON_MAPPER = new ObjectMapper().disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
 
+    private static boolean HAS_SENT_ENCRYPTION_MESSAGE = false;
+
     private static boolean validateChainData(JsonNode data) throws Exception {
         ECPublicKey lastKey = null;
         boolean validChain = false;
@@ -133,7 +135,18 @@ public class LoginEncryptionUtils {
             session.setClientData(JSON_MAPPER.convertValue(JSON_MAPPER.readTree(clientJwt.getPayload().toBytes()), BedrockClientData.class));
 
             if (EncryptionUtils.canUseEncryption()) {
-                LoginEncryptionUtils.startEncryptionHandshake(session, identityPublicKey);
+                try {
+                    LoginEncryptionUtils.startEncryptionHandshake(session, identityPublicKey);
+                } catch (Throwable e) {
+                    // An error can be thrown on older Java 8 versions about an invalid key
+                    if (connector.getConfig().isDebugMode()) {
+                        e.printStackTrace();
+                    }
+
+                    sendEncryptionFailedMessage(connector);
+                }
+            } else {
+                sendEncryptionFailedMessage(connector);
             }
         } catch (Exception ex) {
             session.disconnect("disconnectionScreen.internalError.cantConnect");
@@ -155,6 +168,14 @@ public class LoginEncryptionUtils {
         session.sendUpstreamPacketImmediately(packet);
     }
 
+    private static void sendEncryptionFailedMessage(GeyserConnector connector) {
+        if (!HAS_SENT_ENCRYPTION_MESSAGE) {
+            connector.getLogger().warning(LanguageUtils.getLocaleStringLog("geyser.network.encryption.line_1"));
+            connector.getLogger().warning(LanguageUtils.getLocaleStringLog("geyser.network.encryption.line_2", "https://geysermc.org/supported_java"));
+            HAS_SENT_ENCRYPTION_MESSAGE = true;
+        }
+    }
+
     private static final int AUTH_MSA_DETAILS_FORM_ID = 1334;
     private static final int AUTH_MSA_CODE_FORM_ID = 1335;
     private static final int AUTH_FORM_ID = 1336;