fix: improved handling of search API errors

Author: quintesse

src/main/java/org/codejive/jpm/Main.java

@@ -169,9 +169,14 @@ public Integer call() throws Exception {
                 if (max == null) {
                     max = (Integer) 20;
                 }
-                String[] artifactNames = search(artifactPattern);
-                if (artifactNames.length > 0) {
-                    Arrays.stream(artifactNames).forEach(System.out::println);
+                try {
+                    String[] artifactNames = search(artifactPattern);
+                    if (artifactNames.length > 0) {
+                        Arrays.stream(artifactNames).forEach(System.out::println);
+                    }
+                } catch (UncheckedIOException ex) {
+                    System.err.println(ex.getCause().getMessage());
+                    return 1;
                 }
             }
             return (Integer) 0;

src/main/java/org/codejive/jpm/util/SearchUtils.java

@@ -84,6 +84,13 @@ private static SearchResult select(String query, int start, int count) throws IO
         try (CloseableHttpClient httpClient = HttpClients.custom().setUserAgent(agent).build()) {
             HttpGet request = new HttpGet(searchUrl);
             try (CloseableHttpResponse response = httpClient.execute(request)) {
+                if (response.getStatusLine().getStatusCode() != 200) {
+                    throw new IOException(
+                            "Search failed: Maven Central Search API returned an error: "
+                                    + response.getStatusLine().getStatusCode()
+                                    + " "
+                                    + response.getStatusLine().getReasonPhrase());
+                }
                 DumperOptions dopts = new DumperOptions();
                 Constructor cons = new Constructor(MvnSearchResult.class, new LoaderOptions());
                 Representer representer = new Representer(dopts);
@@ -93,7 +100,8 @@ private static SearchResult select(String query, int start, int count) throws IO
                 InputStreamReader rdr = new InputStreamReader(ins);
                 MvnSearchResult result = yaml.load(rdr);
                 if (result.responseHeader.status != 0) {
-                    throw new IOException("Search failed");
+                    throw new IOException(
+                            "Search failed: Maven Central Search API returned a response that could not be understood");
                 }
                 List<DefaultArtifact> artifacts =
                         result.response.docs.stream()