fix

@@ -56,7 +56,9 @@ public class MysqlZipkinInterceptor implements StatementInterceptorV2 {
 
     private Tracing getTracing() {
         if (tracing == null) {
-            tracing = AppConfig.APP_CONTEXT.getBean(Tracing.class);
+            tracing = AppConfig.APP_CONTEXT != null
+                    ? AppConfig.APP_CONTEXT.getBean(Tracing.class)
+                    : null;
         }
         return tracing;
     }
@@ -70,6 +72,9 @@ public class MysqlZipkinInterceptor implements StatementInterceptorV2 {
                                                final Statement interceptedStatement,
                                                final Connection connection) throws SQLException {
         final var tracing = getTracing();
+        if (tracing == null) {
+            return null;
+        }
         final var context = tracing.currentTraceContext().get();
         final var sqlStr = sql != null ? sql : interceptedStatement.toString();
         log.info("sql exec: {}", sqlStr.replace("\n", ""));
@@ -110,6 +115,9 @@ public class MysqlZipkinInterceptor implements StatementInterceptorV2 {
                                                 final boolean noGoodIndexUsed,
                                                 final SQLException statementException) throws SQLException {
         final var tracing = getTracing();
+        if (tracing == null) {
+            return null;
+        }
         final var span = ThreadLocalSpan.CURRENT_TRACER.remove();
         if (statementException != null) {
             log.error("sql exec failed", statementException);