Index: java/org/apache/jasper/compiler/JDTCompiler.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- java/org/apache/jasper/compiler/JDTCompiler.java	(date 1506521372000)
+++ java/org/apache/jasper/compiler/JDTCompiler.java	(revision )
@@ -312,10 +312,10 @@
                              CompilerOptions.VERSION_1_7);
             } else if(opt.equals("1.8")) {
                 settings.put(CompilerOptions.OPTION_Source,
-                             CompilerOptions.VERSION_1_8);
+                             "1.8"); // CompilerOptions.VERSION_1_8
             } else if(opt.equals("1.9")) {
                 settings.put(CompilerOptions.OPTION_Source,
-                             CompilerOptions.VERSION_1_9);
+                             "1.9"); // CompilerOptions.VERSION_1_9
             } else {
                 log.warn("Unknown source VM " + opt + " ignored.");
                 settings.put(CompilerOptions.OPTION_Source,
@@ -359,14 +359,14 @@
                         CompilerOptions.VERSION_1_7);
             } else if(opt.equals("1.8")) {
                 settings.put(CompilerOptions.OPTION_TargetPlatform,
-                             CompilerOptions.VERSION_1_8);
+                             "1.8"); // CompilerOptions.VERSION_1_8
                 settings.put(CompilerOptions.OPTION_Compliance,
-                        CompilerOptions.VERSION_1_8);
+                        "1.8"); // CompilerOptions.VERSION_1_8
             } else if(opt.equals("1.9")) {
                 settings.put(CompilerOptions.OPTION_TargetPlatform,
-                             CompilerOptions.VERSION_1_9);
+                             "1.9"); // CompilerOptions.VERSION_1_9
                 settings.put(CompilerOptions.OPTION_Compliance,
-                        CompilerOptions.VERSION_1_9);
+                        "1.9"); // CompilerOptions.VERSION_1_9
             } else {
                 log.warn("Unknown target VM " + opt + " ignored.");
                 settings.put(CompilerOptions.OPTION_TargetPlatform,