--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	Thu Apr 12 09:23:34 2018 +0200
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	Thu Apr 12 13:55:20 2018 +0100
@@ -1547,6 +1547,25 @@
 compiler.note.unchecked.plural.additional=\
     Some input files additionally use unchecked or unsafe operations.
 
+# 0: file name
+compiler.note.preview.filename=\
+    {0} uses preview language features.
+
+compiler.note.preview.plural=\
+    Some input files use preview language features.
+
+# The following string may appear after one of the above deprecation
+# messages.
+compiler.note.preview.recompile=\
+    Recompile with -Xlint:preview for details.
+
+# 0: file name
+compiler.note.preview.filename.additional=\
+    {0} has additional uses of preview language features.
+
+compiler.note.preview.plural.additional=\
+    Some input files additionally use preview language features.
+
 # Notes related to annotation processing
 
 # Print a client-generated note; assumed to be localized, no translation required
@@ -2665,6 +2684,34 @@
    {0} are not supported in -source {1}\n\
     (use -source {2} or higher to enable {0})
 
+# 0: message segment (feature)
+compiler.err.preview.feature.disabled=\
+   {0} is a preview feature and is disabled by default.\n\
+   (use --enable-preview to enable {0})
+
+# 0: message segment (feature)
+compiler.err.preview.feature.disabled.plural=\
+   {0} are a preview feature and are disabled by default.\n\
+   (use --enable-preview to enable {0})
+
+# 0: file object (classfile), 1: string (expected version)
+compiler.err.preview.feature.disabled.classfile=\
+   classfile for {0} uses preview features of Java SE {1}.\n\
+   (use --enable-preview to allow loading of classfiles which contain preview features)
+
+# 0: message segment (feature)
+compiler.warn.preview.feature.use=\
+   {0} is a preview feature and may be removed in a future release.
+
+# 0: message segment (feature)
+compiler.warn.preview.feature.use.plural=\
+   {0} are a preview feature and may be removed in a future release.
+
+# 0: file object (classfile), 1: string (expected version)
+compiler.warn.preview.feature.use.classfile=\
+   classfile for {0} uses preview features of Java SE {1}.
+
+
 compiler.misc.feature.modules=\
     modules