--- apache-tomcat-9.0.98-src/java/org/apache/jasper/compiler/JDTCompiler.java	2025-01-06 17:29:55.096709905 +0100
+++ apache-tomcat-9.0.98-src/java/org/apache/jasper/compiler/JDTCompiler.java	2025-01-06 17:32:39.494486072 +0100
@@ -298,7 +298,7 @@
             } else if (opt.equals("15")) {
                 settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_15);
             } else if (opt.equals("16")) {
-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_16);
+                settings.put(CompilerOptions.OPTION_Source, "16");
             } else if (opt.equals("17")) {
                 // Constant not available in latest ECJ version that runs on
                 // Java 8.
@@ -395,8 +395,8 @@
                 settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_15);
                 settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_15);
             } else if (opt.equals("16")) {
-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_16);
-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_16);
+                settings.put(CompilerOptions.OPTION_TargetPlatform, "16");
+                settings.put(CompilerOptions.OPTION_Compliance, "16");
             } else if (opt.equals("17")) {
                 // Constant not available in latest ECJ version that runs on
                 // Java 8.