--- apache-tomcat-9.0.75-src/java/org/apache/jasper/compiler/JDTCompiler.java	2023-05-22 18:12:16.915658492 +0200
+++ apache-tomcat-9.0.75-src/java/org/apache/jasper/compiler/JDTCompiler.java	2023-05-22 19:45:14.491706823 +0200
@@ -310,7 +310,7 @@
             } 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.
@@ -392,8 +392,8 @@
                 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.