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diff -up ./java/org/apache/jasper/compiler/JDTCompiler.java ./java/org/apache/jasper/compiler/JDTCompiler.java
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index 2e361f2..277d8f4 100644
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--- java/org/apache/jasper/compiler/JDTCompiler.java
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+++ java/org/apache/jasper/compiler/JDTCompiler.java
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@@ -310,7 +310,7 @@ public class JDTCompiler extends org.apache.jasper.compiler.Compiler {
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             } else if(opt.equals("15")) {
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                 settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_15);
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             } else if(opt.equals("16")) {
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-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_16);
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+                settings.put(CompilerOptions.OPTION_Source, "16");
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             } else if(opt.equals("17")) {
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                 // Constant not available in latest ECJ version that runs on
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                 // Java 8.
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@@ -377,8 +377,8 @@ public class JDTCompiler extends org.apache.jasper.compiler.Compiler {
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                 settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_15);
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                 settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_15);
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             } else if(opt.equals("16")) {
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-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_16);
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-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_16);
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+                settings.put(CompilerOptions.OPTION_TargetPlatform, "16");
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+                settings.put(CompilerOptions.OPTION_Compliance, "16");
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             } else if(opt.equals("17")) {
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                 // Constant not available in latest ECJ version that runs on
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                 // Java 8.