Fix Java Generator to always generate valid Java variable names

Author: markac

src/main/resources/Java/api.mustache

@@ -41,10 +41,10 @@ public class {{classname}} {
     {{/requiredParamCount}}
 
     {{#queryParams}}if(!"null".equals(String.valueOf({{paramName}})))
-      queryParams.put("{{paramName}}", String.valueOf({{paramName}}));
+      queryParams.put("{{baseName}}", String.valueOf({{paramName}}));
     {{/queryParams}}
 
-    {{#headerParams}}headerParams.put("{{paramName}}", {{paramName}});
+    {{#headerParams}}headerParams.put("{{baseName}}", {{paramName}});
     {{/headerParams}}
 
     String contentType = "application/json";
@@ -68,4 +68,4 @@ public class {{classname}} {
   }
   {{/operation}}
 }
-{{/operations}}
+{{/operations}}

src/main/scala/com/wordnik/swagger/codegen/BasicJavaGenerator.scala

@@ -93,6 +93,11 @@ class BasicJavaGenerator extends BasicGenerator {
   // file suffix
   override def fileSuffix = ".java"
 
+  override def toVarName(name: String): String = {
+    val paramName = name.replaceAll("[^a-zA-Z0-9_]","")
+    super.toVarName(paramName)
+  }
+
   // response classes
   override def processResponseClass(responseClass: String): Option[String] = {
     responseClass match {
@@ -209,4 +214,4 @@ class BasicJavaGenerator extends BasicGenerator {
       ("JsonUtil.mustache", destinationDir + java.io.File.separator + invokerPackage.get.replace(".", java.io.File.separator) + java.io.File.separator, "JsonUtil.java"),
       ("apiException.mustache", destinationDir + java.io.File.separator + invokerPackage.get.replace(".", java.io.File.separator) + java.io.File.separator, "ApiException.java"),
       ("pom.mustache", "generated-code/java", "pom.xml"))
-}
+}