Add additional reserved words for java and csharp (#16276)

Co-authored-by: Jonathan Wenger <jonathan.wenger@avalara.com>

docs/generators/csharp.md

@@ -88,6 +88,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 <li>List</li>
 <li>Object</li>
 <li>String</li>
+<li>System</li>
 <li>System.IO.Stream</li>
 <li>bool</li>
 <li>bool?</li>

docs/generators/java.md

@@ -197,7 +197,9 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 <li>int</li>
 <li>interface</li>
 <li>list</li>
+<li>localdate</li>
 <li>localreturntype</li>
+<li>localtime</li>
 <li>localvaraccept</li>
 <li>localvaraccepts</li>
 <li>localvarauthnames</li>
@@ -215,6 +217,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 <li>new</li>
 <li>null</li>
 <li>object</li>
+<li>offsetdatetime</li>
 <li>package</li>
 <li>private</li>
 <li>protected</li>

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractCSharpCodegen.java

@@ -146,7 +146,7 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen implements Co
                         "foreach", "goto", "if", "implicit", "in", "int", "interface", "internal", "is", "lock",
                         "long", "namespace", "new", "null", "object", "operator", "out", "override", "params",
                         "private", "protected", "public", "readonly", "ref", "return", "sbyte", "sealed",
-                        "short", "sizeof", "stackalloc", "static", "string", "struct", "switch", "this", "throw",
+                        "short", "sizeof", "stackalloc", "static", "string", "struct", "switch", "system", "this", "throw",
                         "true", "try", "typeof", "uint", "ulong", "unchecked", "unsafe", "ushort", "using",
                         "virtual", "void", "volatile", "while")
         );

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -196,7 +196,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
                         "import", "public", "throws", "case", "enum", "instanceof", "return", "transient",
                         "catch", "extends", "int", "short", "try", "char", "final", "interface", "static",
                         "void", "class", "finally", "long", "strictfp", "volatile", "const", "float",
-                        "native", "super", "while", "null")
+                        "native", "super", "while", "null", "offsetdatetime", "localdate", "localtime")
         );
 
         languageSpecificPrimitives = Sets.newHashSet("String",