Fix generic array being changed (#13103)

Author: AlbumenJ

dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DecodeableRpcInvocation.java

@@ -158,9 +158,10 @@ public Object decode(Channel channel, InputStream input) throws IOException {
                 pts = drawPts(path, version, desc, pts);
                 if (pts == DubboCodec.EMPTY_CLASS_ARRAY) {
                     if (RpcUtils.isGenericCall(desc, getMethodName())) {
-                        pts = DubboCodec.GENERIC_PTS_ARRAY;
+                        // Should recreate here for each invocation because the parameterTypes may be changed by user.
+                        pts = new Class<?>[]{String.class, String[].class, Object[].class};
                     } else if (RpcUtils.isEcho(desc, getMethodName())) {
-                        pts = DubboCodec.ECHO_PTS_ARRAY;
+                        pts = new Class<?>[]{Object.class};
                     } else {
                         throw new IllegalArgumentException("Service not found:" + path + ", " + getMethodName());
                     }

dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java

@@ -69,8 +69,6 @@ public class DubboCodec extends ExchangeCodec {
     public static final byte RESPONSE_NULL_VALUE_WITH_ATTACHMENTS = 5;
     public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
     public static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
-    public static final Class<?>[] GENERIC_PTS_ARRAY = new Class<?>[]{String.class, String[].class, Object[].class};
-    public static final Class<?>[] ECHO_PTS_ARRAY = new Class<?>[]{Object.class};
     private static final ErrorTypeAwareLogger log = LoggerFactory.getErrorTypeAwareLogger(DubboCodec.class);
 
     private static final AtomicBoolean decodeInUserThreadLogged = new AtomicBoolean(false);