Index: apache-tomcat-10.1.14-src/java/org/apache/jasper/compiler/JDTCompiler.java
===================================================================
--- apache-tomcat-10.1.14-src.orig/java/org/apache/jasper/compiler/JDTCompiler.java
+++ apache-tomcat-10.1.14-src/java/org/apache/jasper/compiler/JDTCompiler.java
@@ -310,13 +310,13 @@ public class JDTCompiler extends org.apa
             } 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")) {
-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_17);
+                settings.put(CompilerOptions.OPTION_Source, "17");
             } else if(opt.equals("18")) {
-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_18);
+                settings.put(CompilerOptions.OPTION_Source, "18");
             } else if (opt.equals("19")) {
-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_19);
+                settings.put(CompilerOptions.OPTION_Source, "19");
             } else if (opt.equals("20")) {
                 // Constant not available in latest ECJ version shipped with
                 // Tomcat. May be supported in a snapshot build.
@@ -383,17 +383,17 @@ public class JDTCompiler extends org.apa
                 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")) {
-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_17);
-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_17);
+                settings.put(CompilerOptions.OPTION_TargetPlatform, "17");
+                settings.put(CompilerOptions.OPTION_Compliance, "17");
             } else if(opt.equals("18")) {
-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_18);
-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_18);
+                settings.put(CompilerOptions.OPTION_TargetPlatform, "18");
+                settings.put(CompilerOptions.OPTION_Compliance, "18");
             } else if (opt.equals("19")) {
-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_19);
-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_19);
+                settings.put(CompilerOptions.OPTION_TargetPlatform, "19");
+                settings.put(CompilerOptions.OPTION_Compliance, "19");
             } else if (opt.equals("20")) {
                 // Constant not available in latest ECJ version shipped with
                 // Tomcat. May be supported in a snapshot build.