Fix bug throwing exception when first event is collected

- Problem: When running app from jar (e.g. in docker env) ClassLoader
badly interprete classpath as root of app jar, while resources are
located in jar under BOOT-INF/classes/ in Spring Boot apps.

- Solution: Moved file from resources to etc directory so ClassLoader
isn't needed. Filepath of api_version_description.json which
previously was badly resolved now is configured in collector.properties.

Change-Id: I690394cc59e16c95f5902045efc3fdaf13bf9112
Signed-off-by: Michal Banka <michal.banka@nokia.com>
Issue-ID: DCAEGEN2-2426

6 files changed, 29 insertions, 38 deletions

diff --git a/src/main/java/org/onap/dcae/ApplicationSettings.java b/src/main/java/org/onap/dcae/ApplicationSettings.java
index 7d5c7db2..9462a380 100644
--- a/src/main/java/org/onap/dcae/ApplicationSettings.java
+++ b/src/main/java/org/onap/dcae/ApplicationSettings.java
@@ -196,6 +196,10 @@ public class ApplicationSettings {
         return eventTransformations;
     }
 
+    public String getApiVersionDescriptionFilepath() {
+        return properties.getString("collector.description.api.version.location", "etc/api_version_description.json");
+    }
+
     private void loadPropertiesFromFile() {
         try {
             properties.load(configurationFileLocation);
diff --git a/src/main/java/org/onap/dcae/common/HeaderUtils.java b/src/main/java/org/onap/dcae/common/HeaderUtils.java
index c046fb4c..81277d07 100644
--- a/src/main/java/org/onap/dcae/common/HeaderUtils.java
+++ b/src/main/java/org/onap/dcae/common/HeaderUtils.java
@@ -3,7 +3,7 @@
  * PROJECT
  * ================================================================================
  * Copyright (C) 2019 VMware, Inc. All rights reserved.
- * Copyright (C) 2019 Nokia. All rights reserved.s
+ * Copyright (C) 2019-2020 Nokia. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,39 +23,33 @@ package org.onap.dcae.common;
 
 import java.util.Collections;
 import java.util.Map;
-import java.util.Objects;
 import java.util.stream.Collectors;
 import javax.servlet.http.HttpServletRequest;
 import org.springframework.http.HttpHeaders;
 import org.springframework.stereotype.Component;
 
 /**
- * @author nil
+ * A class with methods used in HTTP header management.
  */
 @Component
 public class HeaderUtils {
 
-  public String getApiVerFilePath(String fileName) {
-    return Objects.requireNonNull(ClassLoader.getSystemClassLoader().getResource(fileName))
-        .getPath();
-  }
+    public String getRestApiIdentify(String uri) {
+        return isBatchRequest(uri) ? "eventListener_eventBatch" : "eventListener";
+    }
 
-  public String getRestApiIdentify(String uri) {
-    return isBatchRequest(uri) ? "eventListener_eventBatch" : "eventListener";
-  }
+    public Map<String, String> extractHeaders(HttpServletRequest request) {
+        return Collections.list(request.getHeaderNames()).stream()
+                .collect(Collectors.toMap(h -> h, request::getHeader));
+    }
 
-  public Map<String, String> extractHeaders(HttpServletRequest request) {
-    return Collections.list(request.getHeaderNames()).stream()
-        .collect(Collectors.toMap(h -> h, request::getHeader));
-  }
+    public HttpHeaders fillHeaders(Map<String, String> headers) {
+        HttpHeaders httpHeaders = new HttpHeaders();
+        httpHeaders.setAll(headers);
+        return httpHeaders;
+    }
 
-  public HttpHeaders fillHeaders(Map<String, String> headers) {
-    HttpHeaders httpHeaders = new HttpHeaders();
-    httpHeaders.setAll(headers);
-    return httpHeaders;
-  }
-
-  private boolean isBatchRequest(String request) {
-    return request.contains("eventBatch");
-  }
+    private boolean isBatchRequest(String request) {
+        return request.contains("eventBatch");
+    }
 }
diff --git a/src/main/java/org/onap/dcae/restapi/VesRestController.java b/src/main/java/org/onap/dcae/restapi/VesRestController.java
index de0392e6..0a5930f6 100644
--- a/src/main/java/org/onap/dcae/restapi/VesRestController.java
+++ b/src/main/java/org/onap/dcae/restapi/VesRestController.java
@@ -137,7 +137,7 @@ public class VesRestController {
     private CustomHeaderUtils createHeaderUtils(String version, HttpServletRequest request) {
         return new CustomHeaderUtils(version.toLowerCase().replace("v", ""),
                 headerUtils.extractHeaders(request),
-                headerUtils.getApiVerFilePath("api_version_config.json"),
+                settings.getApiVersionDescriptionFilepath(),
                 headerUtils.getRestApiIdentify(request.getRequestURI()));
 
     }
diff --git a/src/main/resources/api_version_config.json b/src/main/resources/api_version_config.json
deleted file mode 100644
index 23f585f9..00000000
--- a/src/main/resources/api_version_config.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "apiVersion": 
-  {
-    "eventListener": ["4.7.2","5.4.1","7.0.1"],
-    "eventListener_eventBatch": ["4.7.2","5.4.1","7.0.1"]
-  }
-}
diff --git a/src/test/java/org/onap/dcae/common/JsonDataLoader.java b/src/test/java/org/onap/dcae/common/JsonDataLoader.java
index 2ea59aa0..8c2fdd6d 100644
--- a/src/test/java/org/onap/dcae/common/JsonDataLoader.java
+++ b/src/test/java/org/onap/dcae/common/JsonDataLoader.java
@@ -20,7 +20,9 @@
 package org.onap.dcae.common;
 
 import java.io.IOException;
+import java.net.URL;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.Paths;
 
 /**
@@ -35,15 +37,15 @@ public final class JsonDataLoader {
     }
 
     /**
-     * This method is validating given event using schema adn throws exception if event is not valid
+     * This method is validating given event using schema and throws exception when event is invalid
      *
      * @param path to file that will be loaded
      * @return contend of the file located under path, given in parameters, as string
      * @throws IOException when file under given path was not found
      */
     public static String loadContent(String path) throws IOException {
-        return new String(
-                Files.readAllBytes(Paths.get(JsonDataLoader.class.getResource(path).getPath()))
-        );
+        URL resource = JsonDataLoader.class.getResource(path);
+        Path resourcePath = Paths.get(resource.getPath());
+        return new String(Files.readAllBytes(resourcePath));
     }
 }
diff --git a/src/test/java/org/onap/dcae/restapi/VesRestControllerTest.java b/src/test/java/org/onap/dcae/restapi/VesRestControllerTest.java
index 0a03c1a4..ce7e09d3 100644
--- a/src/test/java/org/onap/dcae/restapi/VesRestControllerTest.java
+++ b/src/test/java/org/onap/dcae/restapi/VesRestControllerTest.java
@@ -315,9 +315,7 @@ public class VesRestControllerTest {
 
     private void configureHeadersForEventListener() {
         when(headerUtils.getRestApiIdentify(anyString())).thenReturn("eventListener");
-        when(headerUtils.getApiVerFilePath(anyString())).thenReturn(
-                this.getClass().getResource("/api_version_config.json").getPath()
-        );
+        when(applicationSettings.getApiVersionDescriptionFilepath()).thenReturn("etc/api_version_description.json");
     }
 
     private void verifyThatTransformedEventWasSend(DMaaPEventPublisher eventPublisher, String eventBeforeTransformation) {