bug_fix of gitlab api exception

src/main/java/at/ac/uibk/gitsearch/service/SearchService.java

 package at.ac.uibk.gitsearch.service;
 
+import at.ac.uibk.gitsearch.domain.util.TreeNode;
+import at.ac.uibk.gitsearch.repository.gitlab.GitLabRepository;
+import at.ac.uibk.gitsearch.repository.search.MetaDataRepository;
+import at.ac.uibk.gitsearch.security.AuthoritiesConstants.AuthoritiesConstantEnum;
+import at.ac.uibk.gitsearch.security.jwt.TokenProvider;
+import at.ac.uibk.gitsearch.security.jwt.TokenProvider.GitLabAccessInfo;
+import at.ac.uibk.gitsearch.service.dto.AutoCompleteEntry;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
@@ -19,7 +26,6 @@ import java.util.stream.Stream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
-
 import org.apache.commons.lang3.StringUtils;
 import org.codeability.sharing.plugins.api.search.SearchInputDTO;
 import org.codeability.sharing.plugins.api.search.SearchInputMetadataDTO;
@@ -35,14 +41,6 @@ import org.springframework.security.core.userdetails.User;
 import org.springframework.stereotype.Service;
 import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
 
-import at.ac.uibk.gitsearch.domain.util.TreeNode;
-import at.ac.uibk.gitsearch.repository.gitlab.GitLabRepository;
-import at.ac.uibk.gitsearch.repository.search.MetaDataRepository;
-import at.ac.uibk.gitsearch.security.AuthoritiesConstants.AuthoritiesConstantEnum;
-import at.ac.uibk.gitsearch.security.jwt.TokenProvider;
-import at.ac.uibk.gitsearch.security.jwt.TokenProvider.GitLabAccessInfo;
-import at.ac.uibk.gitsearch.service.dto.AutoCompleteEntry;
-
 /**
  * Service for exercise/course search results
  * <p>
@@ -53,27 +51,33 @@ public class SearchService {
 
     private final Logger log = LoggerFactory.getLogger(SearchService.class);
 
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	protected MetaDataRepository metaDataRepository;
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	protected TokenProvider tokenProvider;
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	protected GitLabRepository gitLabRepository;
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	protected GitlabService gitlabService;
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	protected PluginManagementService pluginManagementService;
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	protected ShoppingBasketService shoppingBasketService;
-	@Autowired
-	@SuppressWarnings("PMD.ImmutableField")
-	private ZipRepackagingService zipRepackagingService;
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    protected MetaDataRepository metaDataRepository;
+
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    protected TokenProvider tokenProvider;
+
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    protected GitLabRepository gitLabRepository;
+
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    protected GitlabService gitlabService;
+
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    protected PluginManagementService pluginManagementService;
+
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    protected ShoppingBasketService shoppingBasketService;
+
+    @Autowired
+    @SuppressWarnings("PMD.ImmutableField")
+    private ZipRepackagingService zipRepackagingService;
 
     /**
      * returns all keyword autocompletes for keyWord
@@ -337,8 +341,7 @@ public class SearchService {
                     filter = Optional.of(exerciseTree);
                 }
             }
-			InputStream project = zipRepackagingService
-					.rePackageGitLabProjectZip(
+            InputStream project = zipRepackagingService.rePackageGitLabProjectZip(
                 new ZipInputStream(repositoryArchive),
                 "from project " + exerciseId.getProjectId(),
                 filter,
@@ -490,7 +493,7 @@ public class SearchService {
         try {
             final Optional<GitLabAccessInfo> gitLabAccessInfo = tokenProvider.getGitLabAccessInfo();
             GitLabApi gitLabApi = gitLabRepository.getGitLabApi(gitLabAccessInfo);
-            gitLabApi.getRepositoryApi().getRepositoryArchive(result.getProject().getProject_id(), "HEAD", "zip");
+            gitLabApi.getRepositoryApi().getRepositoryArchive(Integer.toString(result.getProject().getProject_id()), "HEAD", "zip");
         } catch (GitLabApiException | NullPointerException e) { // TODO NullPointerException thrown if gitLabAccessInfo.isEmpty(): make it more elegant
             // We expect permissions missing
             result.setSupportedActions(