Develop Reference

Property [uniquedataid] not found on type [com.luminajio.input.poststack.PoststackModel]

I am trying to display an arraylist in a JSP. I can query and display some of the elements in my model object, PoststackModel, but some of arraylist elements throw an error. In particular, I cannot display 'uniquedataid'. I do not understand why. Hope someone can help.
In my JSP, I can loop through some of the elements. This works:
<c:forEach var="input" items="${listInput}" >
${input.dataname},
${input.dataid},
${input.surveyname},
${input.surveyid},
${input.projectname},
${input.projectid},
${input.comments}<br>
</c:forEach>
But when I add 'uniquedataid', as such:
<c:forEach var="input" items="${listInput}" >
${input.uniquedataid},
${input.dataname},
${input.dataid},
${input.surveyname},
${input.surveyid},
${input.projectname},
${input.projectid},
${input.comments}<br>
</c:forEach>
I get the following error:
org.apache.jasper.JasperException: An exception occurred processing [/JSP/Viewers/Viewer_2D_Tabs_8.jsp] at line [114]
111: -->
112:
113: <c:forEach var="input" items="${listInput}" >
114: ${input.uniquedataid},
115: ${input.dataname},
116: ${input.dataid},
117: ${input.surveyname},
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:617)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:514)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.luminajio.viewers.Call_2DView.doGet(Call_2DView.java:47)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
javax.el.PropertyNotFoundException: Property [uniquedataid] not found on type [com.luminajio.input.poststack.PoststackModel]
javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:260)
javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:212)
javax.el.BeanELResolver.property(BeanELResolver.java:333)
javax.el.BeanELResolver.getValue(BeanELResolver.java:92)
org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:113)
org.apache.el.parser.AstValue.getValue(AstValue.java:169)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:944)
org.apache.jsp.JSP.Viewers.Viewer_005f2D_005fTabs_005f8_jsp._jspx_meth_c_005fforEach_005f0(Viewer_005f2D_005fTabs_005f8_jsp.java:618)
org.apache.jsp.JSP.Viewers.Viewer_005f2D_005fTabs_005f8_jsp._jspService(Viewer_005f2D_005fTabs_005f8_jsp.java:288)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.luminajio.viewers.Call_2DView.doGet(Call_2DView.java:47)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
My Data Model:
package com.luminajio.input.poststack;
public class PoststackModel {
private String uniquedataid;
private String uniquejobid;
private int dataid;
private String dataname;
private int projectid;
private String projectname;
private int surveyid;
private String surveyname;
private String dataformat;
private String comments;
public PoststackModel(String uniquedataid, String uniquejobid, int dataid, String dataname, int projectid,
String projectname, int surveyid, String surveyname, String dataformat, String comments) {
super();
this.uniquedataid = uniquedataid;
this.uniquejobid = uniquejobid;
this.dataid = dataid;
this.dataname = dataname;
this.projectid = projectid;
this.projectname = projectname;
this.surveyid = surveyid;
this.surveyname = surveyname;
this.dataformat = dataformat;
this.comments = comments;
}
public String getuniquedataId() {
return uniquedataid;
}
public void setuniquedataId(String uniquedataid) {
this.uniquedataid = uniquedataid;
}
public String getUniquejobId() {
return uniquejobid;
}
public void setuniquejobId(String uniquejobid) {
this.uniquejobid = uniquejobid;
}
public int getDataid() {
return dataid;
}
public void setDataid(int dataid) {
this.dataid = dataid;
}
public String getDataname() {
return dataname;
}
public void setDataname(String dataname) {
this.dataname = dataname;
}
public int getProjectid() {
return projectid;
}
public void setProjectid(int projectid) {
this.projectid = projectid;
}
public String getProjectname() {
return projectname;
}
public void setProjectname(String projectname) {
this.projectname = projectname;
}
public int getSurveyid() {
return surveyid;
}
public void setSurveyid(int surveyid) {
this.surveyid = surveyid;
}
public String getSurveyname() {
return surveyname;
}
public void setSurveyname(String surveyname) {
this.surveyname = surveyname;
}
public String getdataFormat() {
return dataformat;
}
public void setdataFormat(String dataformat) {
this.dataformat = dataformat;
}
public String getcomments() {
return comments;
}
public void setcomments(String comments) {
this.comments = comments;
}
}
My Data Access Object is:
package com.luminajio.input.poststack;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import com.luminajio.jdbc.JDBC;
public class PoststackDao {
//String schema = "petrolex";
String schema = "data";
String databaseURL = JDBC.JDBCURL + schema + "?allowPublicKeyRetrieval=true&useSSL=false" ;
String DBlogin= "root";
String DBpass= "lumi123";
public List<PoststackModel> list(String Survey) throws SQLException {
List<PoststackModel> listInput = new ArrayList<>();
try {
Class.forName("com.mysql.cj.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try (Connection connection = DriverManager.getConnection(databaseURL, DBlogin, DBpass)) {
//String sql = "SELECT * FROM data ORDER BY DataName";
String sql = "SELECT * FROM data where surveyname = '" + Survey + "' ORDER BY DataName";
Statement statement = connection.createStatement();
ResultSet result = statement.executeQuery(sql);
while (result.next()) {
String uniquedataid = result.getString("uniquedataid");
String uniquejobid = result.getString("uniquejobid");
int dataid = result.getInt("dataid");
String dataname = result.getString("dataname");
int projectid = result.getInt("projectid");
String projectname = result.getString("projectname");
int surveyid = result.getInt("surveyid");
String surveyname = result.getString("surveyname");
String dataformat = result.getString("dataformat");
String comments = result.getString("comments");
PoststackModel input = new PoststackModel(uniquedataid, uniquejobid, dataid, dataname, projectid, projectname, surveyid, surveyname, dataformat, comments);
listInput.add(input);
}
} catch (SQLException ex) {
ex.printStackTrace();
throw ex;
}
return listInput;
}
}
The servlet that calls the JSP is:
package com.luminajio.viewers;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.servlet.RequestDispatcher;
//import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.luminajio.input.poststack.PoststackDao;
import com.luminajio.input.poststack.PoststackModel;
import com.luminajio.jdbc.ConnectionFactory;
import com.luminajio.modules.Metadata;
import com.luminajio.modules.Notes;
import com.luminajio.modules.ParamOpts;
import com.luminajio.modules.Parameters;
import com.luminajio.modules.Rules;
public class Call_2DView extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String User = request.getParameter("User");
String Theme = request.getParameter("Theme");
String Survey = request.getParameter("Survey");
PoststackDao dao = new PoststackDao();
// Pass just the theme name 'darkness' rather than 'jquery-ui-darkness.css' (ThemeSubmit)
String ThemeSubmit = Theme.replace("jquery-ui-", "");
ThemeSubmit = ThemeSubmit.replace(".css", "");
try {
List<PoststackModel> listInput = dao.list(Survey);
request.setAttribute("listInput", listInput);
request.setAttribute("User",User);
request.setAttribute("Theme",Theme);
request.setAttribute("ThemeSubmit",ThemeSubmit);
request.setAttribute("Survey", Survey);
request.getRequestDispatcher("/JSP/Viewers/Viewer_2D_Tabs_8.jsp").forward(request, response);
} catch (SQLException e) {
e.printStackTrace();
throw new ServletException(e);
}
}
}
Any idea why I get an error when trying to display 'uniquedataid' in my JSP?

Minecraft plugin hanging on "Enabling plugin" and producing out of memory errors

Why would this code be having memory issues? It runs fine once, and then when I try to run it again it hangs on "Enabling plugin". It'll then give me an OutOfMemoryException such as
"Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Worker-Main-10""
The code I am using is as follows from the Spigot API
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.entity.Bat;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitScheduler;
import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.UUID;
public class COVID19 extends JavaPlugin {
private static ArrayList<CovidInfection> infections;
#Override
public void onEnable() {
infections = new ArrayList<CovidInfection>();
System.out.println("1");
try {
readInfections();
} catch (FileNotFoundException fnfe) {
fnfe.printStackTrace();
}
System.out.println("2");
this.getCommand("getInfected").setExecutor(new CommandGetInfected());
BukkitScheduler scheduler = getServer().getScheduler();
scheduler.scheduleSyncRepeatingTask(this, new Runnable() {
#Override
public void run() {
batCovid();
}
}, 0, 10);
System.out.println(4);
}
#Override
public void onDisable() {
try {
writeInfections();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
public void batCovid() {
System.out.println(3);
for(Player player : Bukkit.getOnlinePlayers()) {
for(Entity nearby : player.getNearbyEntities(6, 6, 6)) {
if (nearby instanceof Bat) {
String name = player.getName();
UUID uuid = player.getUniqueId();
infections.add(new CovidInfection(uuid, name, 14));
}
}
}
}
public void readInfections() throws FileNotFoundException {
File file = new File("infected.txt");
if(file.length() == 0) {
return;
}
Scanner input = new Scanner(file);
String line = input.nextLine();
while (!(line.equals(""))) {
infections.add(parseInfectionLine(line));
}
input.close();
}
public void writeInfections() throws IOException {
//File will be written as UUID,Name,DaysRemaining
FileWriter writer = new FileWriter("infected.txt", false);
for(CovidInfection infection : infections) {
writer.write(infection.toString());
}
writer.close();
}
private CovidInfection parseInfectionLine(String line) {
String[] words = line.replace("\n","").split(",");
return new CovidInfection(UUID.fromString(words[0]), words[1], Integer.parseInt(words[2]));
}
public static String getInfected() {
String compiled = "";
for (CovidInfection infection : infections) {
compiled += infection.toString() + "\n";
}
return compiled;
}
}
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
public class CommandGetInfected implements CommandExecutor {
#Override
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
String message = COVID19.getInfected();
if(!(message.equals(""))) {
sender.sendMessage(message);
} else {
sender.sendMessage("There are no infected!");
}
return(true);
}
}
import java.util.UUID;
public class CovidInfection {
private UUID uuid;
private String name;
private int days;
public CovidInfection(UUID uuid, String name, int days) {
this.uuid = uuid;
this.name = name;
this.days = days;
}
public int getDays() {
return days;
}
public String getName() {
return name;
}
public UUID getUuid() {
return uuid;
}
public void newDay() {
days--;
}
public String toString() {
return uuid.toString() + "," + name + "," + days + "\n";
}
}
Any help would be greatly appreciated, thank you!

Firstly, you are make I/O request on main thread.
To fix this issue, use multithreading such as explained here or here
Then, this :
Scanner input = new Scanner(file);
String line = input.nextLine();
Can't be used in a server.
An input like that already exist, it's the console sender.
To do that, I suggest you to use ServerCommandEvent and use spigot's console.

How to connect to ACR122 with CardService

I'm writing a program (Java Application) for reading ePassport. For access I use the library org.jmrtd. What kind of object should I transfer in CardService.getInstance() ?
import net.sf.scuba.smartcards.CardService;
import net.sf.scuba.smartcards.CardServiceException;
import org.jmrtd.BACKeySpec;
import org.jmrtd.PassportService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TestComponent {
private static final Logger log = LoggerFactory.getLogger(MainApp.class);
public static void main(String args[]) {
try {
CardService cs = CardService.getInstance(???????);
PassportService ps = new PassportService(cs);
ps.open();
ps.sendSelectApplet(false);
ps.sendSelectApplet(false);
BACKeySpec bacKey = new BACKeySpec() {
public String getDocumentNumber() {
return "xxxxxxxx";
}
public String getDateOfBirth() {
return "yyMMdd";
}
public String getDateOfExpiry() {
return "yyMMdd";
}
};
ps.doBAC(bacKey);
ps.close();
} catch (CardServiceException e) {
e.printStackTrace();
}
}
}

Answer found:
add in pom
net.sf.scuba
scuba-sc-j2se
0.0.13
import net.sf.scuba.smartcards.TerminalCardService;
CardTerminal terminal =TerminalFactory.getDefault().terminals().list().get(0);
CardService cs = CardService.getInstance(terminal);
PassportService ps = new PassportService(cs);
ps.open();

error: cannot find symbol, won't find my bean

I was given code that I have to make do something else. When I go to compile my servlet, it doesn't recognize my bean. I've deleted, recompiled, and tried from all different directories. I have no clue why this isn't working.
import BH.*;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.function.*;
import static java.util.Arrays.asList;
import java.text.DateFormat;
import java.util.concurrent.locks.ReentrantLock;
import java.util.Random;
public class sessionServlet extends HttpServlet {
private List<String[]> the_sessions;
private DateFormat df;
public static ReentrantLock thelock = new ReentrantLock();
public void init() throws ServletException {
the_sessions=new ArrayList<String[]>();
df=DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG);
}
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
if ((!(req.getParameter("task")==null))&&(req.getParameter("task").trim().equals("deploy"))) {
PrintWriter out = res.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<hr /><center><h1>sessionServlet Deployed</h1></center><hr />");
out.println("</body>");
out.println("</html>");
return;
}
Consumer <String> forwardTo =(s) ->ForwardTo(s,req,res);
boolean is_first_visit=true;
String[] this_session=new String[3];
String manager = req.getParameter("manager");
for (String [] a_session :the_sessions) {
if (a_session[0].equals(manager)) { //Found an active session
is_first_visit=false;
this_session=a_session;
break;
}
}
if ((req.getParameter("task")==null)&&(!is_first_visit)) {
the_sessions.remove(this_session);
is_first_visit=true; // just used http://hoare.cs.umsl.edu/servlet/js_test/sessionServlet
}
req.setAttribute("thesessioncount",the_sessions.size());
if (is_first_visit) {
if (the_sessions.size()==10) {
forwardTo.accept("noSessions.jsp"); //No Available Sessions
return;
}
String randomStr = getRandomString();
String[] new_session = {randomStr,df.format(new Date()),"need a name"};
the_sessions.add(new_session);
this_session=new_session;
req.setAttribute("manager",randomStr);
forwardTo.accept("startSession.jsp");
return;
}
String the_name="";
String the_pw="";
if (this_session[2].equals("need a name")) { //No name given yet
the_name=req.getParameter("whoisit");
the_pw=req.getParameter("passwd");
if ((the_name==null)||(the_name.trim().length()==0)||checkPW(the_name,the_pw)) { //checkPW returns false if correct
the_sessions.remove(this_session);
req.setAttribute("thesessioncount",the_sessions.size());
forwardTo.accept("startSession.jsp");
return; // didn't enter a name in startSession
}
}
this_session[2]=the_name.trim();
req.setAttribute("thename", this_session[2]);
if (tooLong(this_session[1],df.format(new Date()))) { //Has the session timed out?
the_sessions.remove(this_session);
forwardTo.accept("Expired.jsp");
return;
} else {
this_session[1]=df.format(new Date()); //reset the last session activity time
NotesBean thesenotes=new NotesBean();
if(req.getParameter("task").trim().equals("9")){
the_sessions.remove(this_session);
forwardTo.accept("exit.jsp");
return;
}
thelock.lock();
if (!req.getParameter("task").trim().equals("0")) { //add ACC here, also show/update posts
thesenotes.setAll(req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
if (req.getParameter("task").trim().equals("2")) {
thesenotes.setNotes(req.getParameter("notes"),req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
}
}
req.setAttribute("thesessioncount",the_sessions.size());
req.setAttribute("theBean",thesenotes);
req.setAttribute("manager",manager);
//req.setAttribute("theURL", "http://www.umsl.edu/~siegelj/turing.jpg");
forwardTo.accept("getNotes.jsp");
thelock.unlock();
return;
}
}//end doGet
boolean tooLong(String now,String then){
//Check amount of time that passed
return false;
}
boolean checkPW(String name,String password){
AccountBean theAccount = new AccountBean();
theAccount.setAccount(name);
if(theAccount.isPassword(password))
return false;
return true;
}
public void log(String s){
FileWriter fileWriter = null;
try {
String content =s+" at :"+new Date(System.currentTimeMillis()).toString()+"\n";
File theLogFile = new File("C:/Tomcat/webapps/js_test/session.log");
fileWriter = new FileWriter(theLogFile,true);
fileWriter.write(content);
} catch (IOException ex) {
} finally {
try {
fileWriter.close();
} catch (IOException ex) {
}
}
}
void ForwardTo(String s,HttpServletRequest req, HttpServletResponse res)
{
RequestDispatcher rd= req.getRequestDispatcher(s);
try {
rd.forward(req, res);
} catch (IOException|ServletException is) {
log(" req from "+s+" not forwarded at ");
try {
throw is;
} catch (Exception e) {
}
}
}
public void destroy()
{
log("The instance was destroyed");
}
public String getRandomString(){
byte[] randbyte=new byte[10];
Random rand = new Random(System.currentTimeMillis());
for (int idx = 0; idx <10; ++idx) {
int randomInt = rand.nextInt(26); //0<=randomInt<26
//System.out.println(randomInt);
randbyte[idx]=(byte)(randomInt+65);
}
try {
String rs=new String(randbyte, "UTF-8");
//System.out.println(rs);
return rs;
} catch (Exception e) {
//System.out.println("bad string");
return "bad";
}
}
}
AccountBean.java
package mybeans;
import BH.*;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.ArrayList;
import java.util.Arrays;
import static java.util.Arrays.asList;
import java.sql.*;
public class AccountBean implements java.io.Serializable {
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/cs4010";
static final String USER = "cs4010";
static final String PASS = "cs4010";
private String account="";
private String password="";
public AccountBean(){
}
public void setAccount(String a)
{
account = a;
}
public String getAccount()
{
return account;
}
public void setPassword(String p)
{
password = p;
}
public String getPassword(){
return password;
}
public void createAccount()
{
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(DB_URL,USER,PASS);
Statement stmt = conn.createStatement();
// System.out.println("here: "+Bytes_Hex.String2HexString(n));
String this_query="INSERT INTO ries_userpass (username, password) VALUES ("+account+","+password+");";
// System.out.println(this_query);
stmt.executeUpdate(this_query);
stmt.close();
conn.close();
} catch (Exception e) {
}
return ;
}
public boolean isPassword(String p) //make this to use
{
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(DB_URL,USER,PASS);
Statement stmt = conn.createStatement();
String this_query=" SELECT * from ries_userpass WHERE username="+account+";";
ResultSet rs = stmt.executeQuery(this_query);
while (rs.next()) {
password=Bytes_Hex.HexString2String(rs.getString("posts"));
if(password.equals(p))
{
rs.close();
stmt.close();
conn.close();
return true;
}
}
rs.close();
stmt.close();
conn.close();
}
catch (Exception e) {
return false;
}
return false;
}
}

add this statement import mybeans.*;, since you are using AccountBean but you are not importing that class package;
import BH.*;
import mybeans.*;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.function.*;
import static java.util.Arrays.asList;
import java.text.DateFormat;
import java.util.concurrent.locks.ReentrantLock;
import java.util.Random;
public class sessionServlet extends HttpServlet {
private List<String[]> the_sessions;
private DateFormat df;
public static ReentrantLock thelock = new ReentrantLock();
public void init() throws ServletException {
the_sessions=new ArrayList<String[]>();
df=DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG);
}
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
if ((!(req.getParameter("task")==null))&&(req.getParameter("task").trim().equals("deploy"))) {
PrintWriter out = res.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<hr /><center><h1>sessionServlet Deployed</h1></center><hr />");
out.println("</body>");
out.println("</html>");
return;
}
Consumer <String> forwardTo =(s) ->ForwardTo(s,req,res);
boolean is_first_visit=true;
String[] this_session=new String[3];
String manager = req.getParameter("manager");
for (String [] a_session :the_sessions) {
if (a_session[0].equals(manager)) { //Found an active session
is_first_visit=false;
this_session=a_session;
break;
}
}
if ((req.getParameter("task")==null)&&(!is_first_visit)) {
the_sessions.remove(this_session);
is_first_visit=true; // just used http://hoare.cs.umsl.edu/servlet/js_test/sessionServlet
}
req.setAttribute("thesessioncount",the_sessions.size());
if (is_first_visit) {
if (the_sessions.size()==10) {
forwardTo.accept("noSessions.jsp"); //No Available Sessions
return;
}
String randomStr = getRandomString();
String[] new_session = {randomStr,df.format(new Date()),"need a name"};
the_sessions.add(new_session);
this_session=new_session;
req.setAttribute("manager",randomStr);
forwardTo.accept("startSession.jsp");
return;
}
String the_name="";
String the_pw="";
if (this_session[2].equals("need a name")) { //No name given yet
the_name=req.getParameter("whoisit");
the_pw=req.getParameter("passwd");
if ((the_name==null)||(the_name.trim().length()==0)||checkPW(the_name,the_pw)) { //checkPW returns false if correct
the_sessions.remove(this_session);
req.setAttribute("thesessioncount",the_sessions.size());
forwardTo.accept("startSession.jsp");
return; // didn't enter a name in startSession
}
}
this_session[2]=the_name.trim();
req.setAttribute("thename", this_session[2]);
if (tooLong(this_session[1],df.format(new Date()))) { //Has the session timed out?
the_sessions.remove(this_session);
forwardTo.accept("Expired.jsp");
return;
} else {
this_session[1]=df.format(new Date()); //reset the last session activity time
NotesBean thesenotes=new NotesBean();
if(req.getParameter("task").trim().equals("9")){
the_sessions.remove(this_session);
forwardTo.accept("exit.jsp");
return;
}
thelock.lock();
if (!req.getParameter("task").trim().equals("0")) { //add ACC here, also show/update posts
thesenotes.setAll(req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
if (req.getParameter("task").trim().equals("2")) {
thesenotes.setNotes(req.getParameter("notes"),req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
}
}
req.setAttribute("thesessioncount",the_sessions.size());
req.setAttribute("theBean",thesenotes);
req.setAttribute("manager",manager);
//req.setAttribute("theURL", "http://www.umsl.edu/~siegelj/turing.jpg");
forwardTo.accept("getNotes.jsp");
thelock.unlock();
return;
}
}//end doGet
boolean tooLong(String now,String then){
//Check amount of time that passed
return false;
}
boolean checkPW(String name,String password){
AccountBean theAccount = new AccountBean();
theAccount.setAccount(name);
if(theAccount.isPassword(password))
return false;
return true;
}
public void log(String s){
FileWriter fileWriter = null;
try {
String content =s+" at :"+new Date(System.currentTimeMillis()).toString()+"\n";
File theLogFile = new File("C:/Tomcat/webapps/js_test/session.log");
fileWriter = new FileWriter(theLogFile,true);
fileWriter.write(content);
} catch (IOException ex) {
} finally {
try {
fileWriter.close();
} catch (IOException ex) {
}
}
}
void ForwardTo(String s,HttpServletRequest req, HttpServletResponse res)
{
RequestDispatcher rd= req.getRequestDispatcher(s);
try {
rd.forward(req, res);
} catch (IOException|ServletException is) {
log(" req from "+s+" not forwarded at ");
try {
throw is;
} catch (Exception e) {
}
}
}
public void destroy()
{
log("The instance was destroyed");
}
public String getRandomString(){
byte[] randbyte=new byte[10];
Random rand = new Random(System.currentTimeMillis());
for (int idx = 0; idx <10; ++idx) {
int randomInt = rand.nextInt(26); //0<=randomInt<26
//System.out.println(randomInt);
randbyte[idx]=(byte)(randomInt+65);
}
try {
String rs=new String(randbyte, "UTF-8");
//System.out.println(rs);
return rs;
} catch (Exception e) {
//System.out.println("bad string");
return "bad";
}
}
}

Full RESTFUL WebService with GSON and Java

I have created a RESTFUL webservice, witch returns a json, but at this time i only consult and show a simple select * , i need to create a complete CRUD solution, if anyone have some samples to share, i'll appreciate.
Best Regards to all
My code until now are:
DAO - Access.java
package dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import dto.Usuarios;
public class Access
{
public ArrayList<Usuarios> getUsuarios(Connection con) throws SQLException
{
ArrayList<Usuarios> usuariosList = new ArrayList<Usuarios>();
PreparedStatement stmt = con.prepareStatement("SELECT * FROM usuarios");
ResultSet rs = stmt.executeQuery();
try
{
while(rs.next())
{
Usuarios usuariosObj = new Usuarios();
usuariosObj.setUsr_id(rs.getInt("usr_id"));
usuariosObj.setUsr_login(rs.getString("usr_login"));
usuariosObj.setUsr_pwd(rs.getString("usr_pwd"));
usuariosList.add(usuariosObj);
}
} catch (SQLException e)
{
e.printStackTrace();
}
return usuariosList;
}
}
DTO - Usuarios.java
package dto;
public class Usuarios
{
private int usr_id;
private String usr_login;
private String usr_pwd;
public Usuarios()
{
}
public Usuarios(int usr_id, String usr_login, String usr_pwd)
{
super();
this.usr_id = usr_id;
this.usr_login = usr_login;
this.usr_pwd = usr_pwd;
}
public int getUsr_id()
{
return usr_id;
}
public void setUsr_id(int usr_id)
{
this.usr_id = usr_id;
}
public String getUsr_login()
{
return usr_login;
}
public void setUsr_login(String usr_login)
{
this.usr_login = usr_login;
}
public String getUsr_pwd()
{
return usr_pwd;
}
public void setUsr_pwd(String usr_pwd)
{
this.usr_pwd = usr_pwd;
}
#Override
public String toString()
{
return "[ {usr_id=" + usr_id + ", usr_login=" + usr_login + ", usr_pwd=" + usr_pwd + "} ]";
}
}
Model - AccessManager.java
package model;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import dao.Access;
import dao.Database;
import dto.Usuarios;
public class AccessManager
{
public ArrayList<Usuarios> getUsuarios() throws Exception
{
ArrayList<Usuarios> usuariosList = new ArrayList<Usuarios>();
Database db = new Database();
Connection con = db.getConnection();
Access access = new Access();
usuariosList = access.getUsuarios(con);
return usuariosList;
}
}
WebService - UsuariosService.java
package webService;
import java.util.ArrayList;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import com.google.gson.Gson;
import model.AccessManager;
import dto.Usuarios;
#Path("/UsuariosService")
public class UsuariosService
{
#GET
#Path("/usuarios")
#Produces("application/json")
public String usuarios()
{
String usuarios = null;
ArrayList<Usuarios> usuariosList = new ArrayList<Usuarios>();
try
{
usuariosList = new AccessManager().getUsuarios();
Gson gson = new Gson();
//usuarios = gson.toJson(usuariosList);
usuarios = "{\"usuarios\" :" + gson.toJson(usuariosList) + "}";
} catch (Exception e)
{
e.printStackTrace();
}
return usuarios;
}
}

Usually you should ask a specific trouble you have instead of ask for samples. It looks like you have a structured code and all you need is implement all operations exposing as a service.
In case you need a sample, there quite a lot of resources on the web. Something like this: https://code.google.com/p/javaee6-crud-example/
I'll try give you some quick tips below:
WebService - UsuariosService.java
#POST
#Path("/usuarios")
public Response save(Usuario user) {
try {
manager= new AccessManager();
manager.save(user);
return Response.ok("User has been created.").build();
} catch (Exception e) {
e.printStackTrace();
}
return usuarios;
}
#DELETE
#Path("/usuarios/{id}")
public Response delete(#PathParam("id") String id) {
try {
manager= new AccessManager();
manager.delete(id);
return Response.ok("User has been deleted.").build();
} catch (Exception e) {
e.printStackTrace();
}
return usuarios;
}
#PUT
#Path("/usuarios/{id}")
public Response delete(#PathParam("id") String id, Usuario user) {
try {
manager= new AccessManager();
manager.update(id, user);
return Response.ok("User has been updated.").build();
} catch (Exception e) {
e.printStackTrace();
}
return usuarios;
}
If you don´t understand the usage of PUT, DELETE, POST and so on, I recommend you to read HTTP Method Tutorial. There is several discussion regarding this but you might skip it for a while.
I think you might get an idea from here. Your DAO needs to implement methods to perform CRUD interface as well. The link I've added has a very simple sample that might help as well. You might also check this JPA link.
Not sure whether info above helped but I think it is a start since you have to code it in order to understand more about it :)