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I can't add an element to the list. It returns null. How can I add it? [duplicate]

This question already has answers here:
Java List<string> not adding to list after Arrays.asList() has been used
(3 answers)
Closed 4 months ago.
My controller class:
#PostMapping(value = "/uniqueUrl")
#ResponseBody
public ResponseEntity<MyResponse> urlGenerator(#RequestBody MyRequest myRequest){
log.info("Request for url : ", myRequest);
MyResponse myResponse= this.generateUrlService.urlGenerator(myRequest);
log.info("generateUniqueUrl response: ", myResponse.getLongUniqueUrlList());
return ResponseEntity.accepted().body(myResponse);
}
MyRequest class:
#Data
public class MyRequestimplements Serializable {
#NotNull(message = "Url cannot be null or empty")
private String url;
#NotNull(message = "count cannot be null or empty")
private int cound;
}
My service implemantation :
#Override
public myResponse urlGenerator(MyRequest myRequest) {
log.info("urlGenerator started..");
myUrlRequestValidator.validate(myRequest);
String longUrl = myRequest.getUrl();
int count = myRequest.getCount();
List<String> uniqueUrlList = Arrays.asList(new String[count]);
for (String string : uniqueUrlList) {
string = longUrl + "/?";
for (int i = 0; i < rand.nextInt(11)+4; i++) {
string += letters.get(rand.nextInt(35));
}
uniqueUrlList.add(string);
log.info(string);
}
MyResponse response = new MyResponse();
response.setLongUniqueUrlList(uniqueUrlList);
return response;
}
MyResponse class:
#Data
public class MyResponse extends BaseResponse {
private List<String> longUniqueUrlList;
private List<String> shortUrlList;
}
In the method where my Controller and Service class is as follows, the result of uniqueUrlList returns null. I want to add each string formed by the add method to the list, but it does not add it. Can you help me where am I going wrong?
edit1 : When I change the random url generation and adding to the list in this way, it does not enter the for loop, or when I do not change the loop and only define it as an arraylist, it gives a Null error in the add method. How can I solve this? It's such an easy thing, but I don't understand why I can't do it?
List<String> uniqueUrlList = new ArrayList<String>();
String string = null;
for ( int j = 0; j < count; j++) {
string = longUrl + "/?";
for (int i = 0; i < rand.nextInt(11)+4; i++) {
string += letters.get(rand.nextInt(35));
}
uniqueUrlList.add(string);
log.info(string);
}
}

It is null because your List<String> uniqueUrlList is initialized with Arrays.asList which are fixed in size and unmodifiable, as specified in the Javadoc. The Arrays.asList(new String[count]) is also empty as there are no elements inside the new String[count].
Instead you should initialize it with a new ArrayList<String>():
List<String> uniqueUrlList = new ArrayList<String>();
Where you can then modify the list as you please, using a loop to add to your uniqueUrlList as many as myRequest.getCount() times.

You should initialize a list by
List<String> uniqueUrlList = new ArrayList<>();

Rally Java: Duplicate test case getting created

I have built a Rally dependency, which auto creates test case, folder in Test Plan. While creating test case it checks first if there any any existing test case with same name, else it creates new test case.
This was working while total test case size was small, while the test case size increased, i am seeing duplicate test cases are created. So I made thread to wait for few seconds (Thread.sleep(8000)) after checking existing scenarios and then creating new scenario. It works by this way.
Is there better way to handle & implement this to handle any size of test case. Please advice.
String tcName = rallyMethods.getTestScenarios(parentFolder, scenarioName);
Thread.sleep(8000);
if (tcName == null) {
rallyMethods.createTestCase(parentFolder, scenarioName);
Thread.sleep(8000);
} else {
rallyMethods.updateTestCase(parentFolder, scenarioName);
Thread.sleep(8000);
}
public String getTestScenarios(String parentFolderName, String ScenarioName) throws Throwable {
String sName = null;
String pFolder;
QueryRequest testCaseRequest = new QueryRequest("TestCase");
testCaseRequest.setLimit(Integer.MAX_VALUE);
testCaseRequest.setPageSize(Integer.MAX_VALUE);
testCaseRequest.setFetch(new Fetch("FormattedID", "Name", "Workspace", "Project", "TestFolder"));
testCaseRequest.setQueryFilter(new QueryFilter("Name", "=", ScenarioName));
testCaseRequest.setWorkspace(WORKSPACE_ID);
testCaseRequest.setProject(PROJECT_ID);
QueryResponse testCaseQueryResponse = query(testCaseRequest);
int testCaseCount = testCaseQueryResponse.getTotalResultCount();
// System.out.println("TestCaseCount:" + testCaseCount);
for (int i = 0; i < testCaseCount; i++) {
JsonObject scenarioObj = testCaseQueryResponse.getResults().get(i).getAsJsonObject();
String scenarioName = String.valueOf(scenarioObj.get("Name").getAsString());
JsonElement pFolderObj = scenarioObj.get("TestFolder");
if (!(pFolderObj.isJsonNull())) {
JsonObject tFolderObj = scenarioObj.get("TestFolder").getAsJsonObject();
pFolder = String.valueOf(tFolderObj.get("Name").getAsString());
if (parentFolderName.equalsIgnoreCase(pFolder)) {
sName = scenarioName;
logger.info("Test Scenarios identified in Rally: " + sName);
} else {
logger.info("Scenario, " + ScenarioName + " not found, New Scenario will be created in Rally");
}
}
}
return sName;
}
public void createTestCase(String parentFolderName, String testCaseName) throws Throwable {
String tcName = null;
String userID = readUser();
// Query Child Folders:
QueryRequest testFolderRequest = new QueryRequest("TestFolder");
testFolderRequest.setFetch(new Fetch("Name", "Workspace", "Project"));
testFolderRequest.setQueryFilter(new QueryFilter("Name", "=", parentFolderName));
testFolderRequest.setWorkspace(WORKSPACE_ID);
testFolderRequest.setProject(PROJECT_ID);
QueryResponse testFolderQueryResponse = query(testFolderRequest);
int folderCount = testFolderQueryResponse.getTotalResultCount();
for (int i = 0; i < folderCount; i++) {
String testFolderRef = testFolderQueryResponse.getResults().get(i).getAsJsonObject().get("_ref").getAsString();
JsonObject testFolderObj = testFolderQueryResponse.getResults().get(i).getAsJsonObject();
String pFolder = String.valueOf(testFolderObj.get("Name").getAsString());
if (pFolder.equalsIgnoreCase(parentFolderName)) {
//System.out.println("Creating a test case...");
JsonObject newTC = new JsonObject();
newTC.addProperty("Name", testCaseName);
newTC.addProperty("Workspace", WORKSPACE_ID);
newTC.addProperty("Project", PROJECT_ID);
newTC.addProperty("Description", "Selenium Automated TestCase");
newTC.addProperty("TestFolder", testFolderRef);
newTC.addProperty("Method", "Automated");
newTC.addProperty("Type", "Functional");
if (!(userID == null)) {
newTC.addProperty("Owner", userID);
}
CreateRequest createRequest = new CreateRequest("testcase", newTC);
CreateResponse createResponse = create(createRequest);
if (createResponse.wasSuccessful()) {
JsonObject tcObj = createResponse.getObject();
tcName = String.valueOf(tcObj.get("Name").getAsString());
logger.info("Created test scenario name is: " + tcName);
} else {
String[] createErrors;
createErrors = createResponse.getErrors();
logger.info("Error while creating test scenario below parent folder!");
for (int j = 0; j < createErrors.length; j++) {
System.out.println(createErrors[j]);
logger.info(createErrors[j]);
}
}
}
}
}

Hmmm... I'm not too familiar with the Java REST toolkit, but I can't think of a reason why a larger set of test cases in the workspace would cause the query to fail like that.
Did you try checking testCaseQueryResponse.wasSuccessful()? If it returns false, can you see what the error is? testCaseQueryResponse.getErrors()
My first thoughts are that you should provide a reasonable value for the limit and pageSize parameters, rather than passing Integer.MAX_VALUE. And second, rather than checking if the returned test cases are in the specified parent folder, you should include a query filter to filter the test cases results on TestFolder.Name = parentFolderName. Then you should only be expecting either 1 or 0 results returned (assuming that you're expecting all test cases within a test folder to have unique names).

Java REST API upon building string after get request replace null values with string vale

I am currently working on a Java application where I have an AsyncTask function get data from an API, then have a line reader and string builder create a large string, which I then pass to the postExecute function where I convert that string into a JSON object. I have tried creating a function that takes the string before post execute and replaces all null with "N/A", I have also tried checking in the String builder function but neither seem to make any changes to the null value. Here is an example of what the code looks like. I believe the error occurs when The string is converted into the JSON Object. This is a school project and I am not allowed to use external libraries.
String Builder:
BufferedReader reader = new BufferedReader(new InputStreamReader(httpClient.getInputStream()));
StringBuilder builder = new StringBuilder();
String line;
while((line = reader.readLine()) != null) {
if (line.contains(null) || line.contains(""))
line += "N/A";
else
continue;
builder.append(line + "\n");
}
replaceNull Function:
public String removeUnwantedVal(String message) {
if (message.contains("null")) {
String replacement = "N/A";
message.replaceAll(null, replacement);
}
return message;
}
Post Execute JSON Object:
protected void onPostExecute(String message) {
TextView tv = findViewById(R.id.display);
System.out.println(message);
try {
JSONObject jsonAddress = new JSONObject(message);
// DISPLAY INFORMATION
String requesterIP = jsonAddress.getString("requester-ip");
String execTime = jsonAddress.getString("execution-time");
ipInfo.setIPAndTime(requesterIP, execTime);
// GEOGRAPHY
JSONObject geo = jsonAddress.getJSONObject("geo");
String countryName = geo.getString("country-name");
String capital = geo.getString("capital");
String iso = geo.getString("country-iso-code");
String city = geo.getString("city");
double longitude = geo.getDouble("longitude");
double latitude = geo.getDouble("latitude");
location = new Location(countryName, capital, iso, city, longitude, latitude);
// CURRENCY
JSONObject currency = jsonAddress.getJSONObject("currency");
String currencyNativeName = currency.getString("native-name");
String currencyCode = currency.getString("code");
String currencyName = currency.getString("name");
String currencySymbol = currency.getString("symbol");
Currency = new Currency(currencyNativeName, currencyCode, currencyName, currencySymbol);
// ASN
JSONObject asn = jsonAddress.getJSONObject("asn");
String asnName = asn.getString("name");
String asnDomain = asn.getString("domain");
String asnOrganization = asn.getString("organization");
String asnCode = asn.getString("asn");
String asnType = asn.getString("type");
ASN = new ASN(asnName, asnDomain, asnOrganization, asnCode, asnType);
// TIMEZONE
JSONObject timezone = jsonAddress.getJSONObject("timezone");
String timezoneName = timezone.getString("microsoft-name");
String dateTime = timezone.getString("date-time");
String ianaName = timezone.getString("iana-name");
Timezone = new Timezone(timezoneName, dateTime, ianaName);
// SECURITY
JSONObject security = jsonAddress.getJSONObject("security");
boolean isCrawler = security.getBoolean("is-crawler");
boolean isProxy = security.getBoolean("is-proxy");
boolean isTor = security.getBoolean("is-tor");
Security = new Security(isCrawler, isProxy, isTor);
container = new IPContainer(ipInfo, Currency, location, Security, ASN, Timezone);
tv.setText(container.displayGeneral());
} catch (JSONException e) {
tv.setText(e.toString());
e.printStackTrace();
}
}

I have resolved the issue. When I was getting the code I thought that null values could not be displayed, this was incorrect. The problem was that I was trying to create an object out of null, sometimes the value came back as null instead of as an object. Sorry, beginner coder :)

Use string values from an array as string variable to parse json - codenameone

I have a no. of checkboxes (20), what i did is if a user select any checkbox, its name is stored in an array (eg abc array below in code). The name of the string variable that stores the respective json is of the same name as of the checkbox. For eg if Checkbox "a" is clicked, string value "a" is stored in array and there is a string variable named "a" that stores the related json values. What I need is that if i pass the string value stored in array as InputStream is = new ByteArrayInputStream(abc.get(i).getBytes()), it should be used to parse the inputStream for json. But it gives NullPointerException since the string value "a" is not equal to string variable a. How can i solve this problem? I ran out of ideas here. Is there other ways to achieve what i want to do here?
code: String values of the selected checkboxes are stored in an array
String a = "[{\n"
+ "\t\t\t\"title\": \"title1\",\n"
+ "\t\t\t\"describ\": \"describ1\"\n"
+ "}]";
String b = "[{\n"
+ "\"title\": \"title2\",\n"
+ "\"describ\": \"describ2\"\n"
+ "}]";
String c = "[{\n"
+ "\t\t\t\"title\": \"title3\",\n"
+ "\t\t\t\"describ\": \"describ3\"\n"
+ "}]";
//and all jsons required are there
ArrayList<String> abc;
#Override
protected void beforeTestForApp(Form f) {
f.setTitle("abc");
abc = new ArrayList<>();
//I have stored "a" & "b" in the abc array here for simplicity, but it is dynamic,
//ie. if the user select checkbox c, c will be stored in abc array and so on
abc.add("a");
abc.add("b");
Button bb = new Button("go");
bb.addActionListener((e) -> {
showForm("TestForAppResult", null);
});
f.add(bb);
}
Form for json parser and displaying the values:
#Override
protected void beforeTestForAppResult(Form f) {
f.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
InputStream is;
for (int i = 0; i < abc.size(); i++) {
Label heading = new Label(abc.get(i));
f.add(heading);
//this gives error since abc.get(i) gives string value, not string variable
is = new ByteArrayInputStream(abc.get(i).getBytes());
showDetails(is, f);
}
//if i do this instead of for loop jst above, i can get the result but since what value'll be stored in an array is not known,it is not possible
//is = new ByteArrayInputStream(a.getBytes());
//showDetails(is, f);
//is = new ByteArrayInputStream(b.getBytes());
//showDetails(is, f);
}
private void showDetails(InputStream is, Form f) {
JSONParser p = new JSONParser();
Hashtable<String, Object> test;
try {
test = p.parse(new InputStreamReader(is));
Vector aVector = (Vector) test.get("root");
for (int j = 0; j < aVector.size(); j++) {
Hashtable hm = (Hashtable) aVector.get(j);
String title = (String) hm.get("title");
String describ = (String) hm.get("describ");
Label z = new Label(title);
Label zz = new Label(describ);
f.add(z);
f.add(zz);
}
} catch (IOException ex) {
}
}

tbh i didnt get your problem concretely but i still try to give you some shots so you can try out.
If i understand correctly you have 20 objects which contains values underlying?
So then you have a JSONArray, just iterate trough it and grab that JSONObject.
now just use parseJSON instead of parse as it is deprecated...
here is a short snippet of my code
JSONArray jsonTasks = new JSONArray(responseString);
for (int index = 0; index < jsonTasks.length(); index++) {
JSONObject jsonObject = (JSONObject) jsonTasks.get(index);
if (jsonObject != null) {
Map jsonMap = new JSONParser().parseJSON(new InputStreamReader(new ByteArrayInputStream(jsonObject.toString().getBytes(UTF8)), UTF8));
System.out.println(jsonMap.get("date"));

How to identify PP-tags/NP-tags/VP-tags in openNLP chunker?

I want to count the numbers of pp/np/vp in the text but I don't know how to identify PP-tags/NP-tags/VP-tags in openNLP chunker? I have tried this code but it's not working.
ChunkerModel cModel = new ChunkerModel(modelIn);
ChunkerME chunkerME = new ChunkerME(cModel);
String result[] = chunkerME.chunk(whitespaceTokenizerLine, tags);
HashMap<Integer,String> phraseLablesMap = new HashMap<Integer, String>();
Integer wordCount = 1;
Integer phLableCount = 0;
for (String phLable : result) {
if(phLable.equals("O")) phLable += "-Punctuation"; //The phLable of the last word is OP
if(phLable.split("-")[0].equals("B")) phLableCount++;
phLable = phLable.split("-")[1] + phLableCount;
System.out.println(wordCount + ":" + phLable);
phraseLablesMap.put(wordCount, phLable);
wordCount++;
}
Integer noPP=0;
Integer TotalPP=0;
for (String PPattach: result) {
if (PPattach.equals("PP")) {
for (int i=0;i<result.length;i++)
TotalPP = noPP +1;
}
}
System.out.println(TotalPP);
Output:
1:NP1
2:VP2
3:NP3
4:NP3
5:VP4
6:PP5
7:NP6
8:NP6
9:NP6
10:NP6
11:PP7
12:NP8
13:NP8
14:NP8
15:PP9
16:NP10
17:NP10
18:PP11
19:NP12
20:NP12
21:VP13
22:VP13
23:NP14
24:NP14
25:PP15
26:NP16
27:NP16
28:Punctuation16
0

best way is by using the span objects, they have a getType() method that returns the chunk type.
see this post
grouping all Named entities in a Document