GH-310 Fixed NullPointerException when zowe.config is empty

Signed-off-by: Katsiaryna Tsytsenia <[email protected]>

Author: ktsytsen

src/main/kotlin/org/zowe/kotlinsdk/zowe/config/utils.kt

@@ -87,9 +87,10 @@ private fun formProfiles (profiles: Map<String, ZoweConfigProfile>?) {
  * Parses JSON string to [ZoweConfig] object model.
  * @param configString JSON string with zowe config.
  * @return [ZoweConfig] object model.
+ * @throws [com.google.gson.JsonSyntaxException] and NullPointerException in case of empty file
  */
 fun parseConfigJson(configString: String): ZoweConfig {
-  val zoweConfig = Gson().fromJson(configString, ZoweConfig::class.java)
+  val zoweConfig = Gson().fromJson(configString, ZoweConfig::class.java) ?: throw NullPointerException()
   zoweConfig.zosmfProfile = zoweConfig.profile(zoweConfig.defaults["zosmf"])
   formProfiles(zoweConfig.profiles)
   return zoweConfig
@@ -99,6 +100,7 @@ fun parseConfigJson(configString: String): ZoweConfig {
  * Reads input stream and parse it to ZoweConfig object model.
  * @param inputStream - stream with json string of zowe config.
  * @return ZoweConfig object model.
+ * @throws [com.google.gson.JsonSyntaxException] and NullPointerException in case of empty file
  */
 fun parseConfigJson (inputStream: InputStream): ZoweConfig = parseConfigJson(String(inputStream.readBytes()))
 

src/test/kotlin/org/zowe/kotlinsdk/zowe/ZoweConfigParsingTest.kt

@@ -68,6 +68,11 @@ class ZoweConfigParsingTest: ZoweConfigTestBase() {
     checkZoweConfig(zoweConfig)
   }
 
+  @Test
+  fun testParsingEmptyJsonString() {
+    Assertions.assertThrows(NullPointerException::class.java){ parseConfigJson("") }
+  }
+
   @Test
   fun testZOSConnection() {
     val zoweConfig = parseConfigJson(streamConfigJson)