output: #fixed code
                               public void execute() {
  		if (help) {
  			command.usage("init");
  		} else {
  			try {
  				WalkModFacade facade = new WalkModFacade(OptionsBuilder.options());
  				Configuration cfg = facade.getConfiguration();
  				
  				Collection<PluginConfig> installedPlugins = null;
  				if(cfg != null){
  					installedPlugins = cfg.getPlugins();
  				}
  				URL searchURL = new URL(MVN_SEARCH_URL);
  				InputStream is = null;
  				Map<String, Boolean> installedList = new LinkedHashMap<String, Boolean>();
  				Map<String, String> pluginsList = new LinkedHashMap<String, String>();
  				Map<String, String> pluginsURLs = new LinkedHashMap<String, String>();
  				try {
  					is = searchURL.openStream();
  
  					String content = readInputStreamAsString(is);
  					DefaultJSONParser parser = new DefaultJSONParser(content);
  					JSONObject object = parser.parseObject();
  					parser.close();
  
  					JSONArray artifactList = (object.getJSONObject("response")).getJSONArray("docs");
  
  					for (int i = 0; i < artifactList.size(); i++) {
  						JSONObject artifact = artifactList.getJSONObject(i);
  						String artifactId = artifact.getString("a");
  						if (artifactId.startsWith("walkmod-") && artifactId.endsWith("-plugin")) {
  							String groupId = artifact.getString("g");
  							String latestVersion = artifact.getString("latestVersion");
  							String pom = artifactId + "-" + latestVersion + ".pom";
  							String directory = groupId.replaceAll("\\.", "/");
  
  							URL artifactDetailsURL = new URL(ARTIFACT_DETAILS_URL + directory + "/" + artifactId + "/"
  									+ latestVersion + "/" + pom);
  
  							InputStream projectIs = artifactDetailsURL.openStream();
  
  							try {
  								DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
  								DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
  								Document doc = dBuilder.parse(projectIs);
  
  								NodeList nList = doc.getElementsByTagName("description");
  								String description = "unavailable description";
  								if (nList.getLength() == 1) {
  									description = nList.item(0).getTextContent();
  								}
  								String id = "";
  								if (!groupId.equals("org.walkmod")) {
  									id = groupId + ":";
  								}
  								id += artifactId.substring("walkmod-".length(),
  										artifactId.length() - "-plugin".length());
  
  								if (Character.isLowerCase(description.charAt(0))) {
  									description = Character.toUpperCase(description.charAt(0))
  											+ description.substring(1, description.length());
  								}
  								if (!description.endsWith(".")) {
  									description = description + ".";
  								}
  								pluginsList.put(id, description);
  								nList = doc.getChildNodes().item(0).getChildNodes();
  								int max = nList.getLength();
  								String url = "unavailable url";
  
  								for (int j = 0; j < max; j++) {
  									String name = nList.item(j).getNodeName();
  									if (name.equals("url")) {
  										url = nList.item(j).getTextContent();
  										j = max;
  									}
  								}
  
  								pluginsURLs.put(id, url);
  
  								PluginConfig equivalentPluginCfg = new PluginConfigImpl();
  								equivalentPluginCfg.setGroupId(groupId);
  								equivalentPluginCfg.setArtifactId(artifactId);
  
  								boolean isInstalled = (installedPlugins != null && installedPlugins
  										.contains(equivalentPluginCfg));
  
  								installedList.put(id, isInstalled);
  
  							} finally {
  								projectIs.close();
  							}
  						}
  					}
  				} finally {
  					is.close();
  				}
  				Set<String> keys = pluginsList.keySet();
  				List<String> sortedKeys = new LinkedList<String>(keys);
  				Collections.sort(sortedKeys);
  
  				at = new V2_AsciiTable();
  				at.addRule();
  				at.addRow("PLUGIN NAME (ID)", "INSTALLED", "URL (DOCUMENTATION)", "DESCRIPTION");
  				at.addStrongRule();
  				for (String key : sortedKeys) {
  					String installed = "";
  					if (installedList.get(key)) {
  						installed = "*";
  					}
  					at.addRow(key, installed, pluginsURLs.get(key), pluginsList.get(key));
  				}
  				at.addRule();
  
  			} catch (Exception e) {
  				throw new WalkModException("Invalid plugins URL", e);
  			}
  		}
  	}
input: #vulnerable code 
                               public void execute() {
  		if (help) {
  			command.usage("init");
  		} else {
  			try {
  				WalkModFacade facade = new WalkModFacade(OptionsBuilder.options());
  				Configuration cfg = facade.getConfiguration();
  				Collection<PluginConfig> installedPlugins = cfg.getPlugins();
  				URL searchURL = new URL(MVN_SEARCH_URL);
  				InputStream is = null;
  				Map<String, Boolean> installedList = new LinkedHashMap<String, Boolean>();
  				Map<String, String> pluginsList = new LinkedHashMap<String, String>();
  				Map<String, String> pluginsURLs = new LinkedHashMap<String, String>();
  				try {
  					is = searchURL.openStream();
  
  					String content = readInputStreamAsString(is);
  					DefaultJSONParser parser = new DefaultJSONParser(content);
  					JSONObject object = parser.parseObject();
  					parser.close();
  
  					JSONArray artifactList = (object.getJSONObject("response")).getJSONArray("docs");
  
  					for (int i = 0; i < artifactList.size(); i++) {
  						JSONObject artifact = artifactList.getJSONObject(i);
  						String artifactId = artifact.getString("a");
  						if (artifactId.startsWith("walkmod-") && artifactId.endsWith("-plugin")) {
  							String groupId = artifact.getString("g");
  							String latestVersion = artifact.getString("latestVersion");
  							String pom = artifactId + "-" + latestVersion + ".pom";
  							String directory = groupId.replaceAll("\\.", "/");
  
  							URL artifactDetailsURL = new URL(ARTIFACT_DETAILS_URL + directory + "/" + artifactId + "/"
  									+ latestVersion + "/" + pom);
  
  							InputStream projectIs = artifactDetailsURL.openStream();
  
  							try {
  								DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
  								DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
  								Document doc = dBuilder.parse(projectIs);
  
  								NodeList nList = doc.getElementsByTagName("description");
  								String description = "unavailable description";
  								if (nList.getLength() == 1) {
  									description = nList.item(0).getTextContent();
  								}
  								String id = "";
  								if (!groupId.equals("org.walkmod")) {
  									id = groupId + ":";
  								}
  								id += artifactId.substring("walkmod-".length(),
  										artifactId.length() - "-plugin".length());
  
  								if (Character.isLowerCase(description.charAt(0))) {
  									description = Character.toUpperCase(description.charAt(0))
  											+ description.substring(1, description.length());
  								}
  								if (!description.endsWith(".")) {
  									description = description + ".";
  								}
  								pluginsList.put(id, description);
  								nList = doc.getChildNodes().item(0).getChildNodes();
  								int max = nList.getLength();
  								String url = "unavailable url";
  
  								for (int j = 0; j < max; j++) {
  									String name = nList.item(j).getNodeName();
  									if (name.equals("url")) {
  										url = nList.item(j).getTextContent();
  										j = max;
  									}
  								}
  
  								pluginsURLs.put(id, url);
  
  								PluginConfig equivalentPluginCfg = new PluginConfigImpl();
  								equivalentPluginCfg.setGroupId(groupId);
  								equivalentPluginCfg.setArtifactId(artifactId);
  
  								boolean isInstalled = (installedPlugins != null && installedPlugins
  										.contains(equivalentPluginCfg));
  
  								installedList.put(id, isInstalled);
  
  							} finally {
  								projectIs.close();
  							}
  						}
  					}
  				} finally {
  					is.close();
  				}
  				Set<String> keys = pluginsList.keySet();
  				List<String> sortedKeys = new LinkedList<String>(keys);
  				Collections.sort(sortedKeys);
  
  				at = new V2_AsciiTable();
  				at.addRule();
  				at.addRow("PLUGIN NAME (ID)", "INSTALLED", "URL (DOCUMENTATION)", "DESCRIPTION");
  				at.addStrongRule();
  				for (String key : sortedKeys) {
  					String installed = "";
  					if (installedList.get(key)) {
  						installed = "*";
  					}
  					at.addRow(key, installed, pluginsURLs.get(key), pluginsList.get(key));
  				}
  				at.addRule();
  
  			} catch (Exception e) {
  				throw new WalkModException("Invalid plugins URL", e);
  			}
  		}
  	} 
                              #location 8 
                              #vulnerability type NULL_DEREFERENCE