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  • python-like Java IO library?

    - by drozzy
    Java is not my main programming language so I might be asking the obvious. But is there a simple file-handling library in Java, like in python? For example I just want to say: File f = Open('file.txt', 'w') for(String line:f){ //do something with the line from file } Thanks!

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  • extend php with java/c++?

    - by fayer
    i only know php and i wonder if you can extend a php web application with c++ or java when needed? i dont want to convert my code with quercus, cause that is very error prone. is there another way to extend it? cause from what i have read python can extend it with c++ without converting the python code and use java with jython?

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  • related to java file handling.

    - by sadia
    In Java how can I take the data of my file on my display screen? I want to use data in my file and also want that data to be displayed on my output screen when I execute my program. Can any body please help by providing me such example in Java language. Thank you!

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  • mongodb java driver - raw command?

    - by Scott
    Is it possible to execute raw commands as javascript through the Java driver for MongoDB? I'm tired of wrapping everything in Java objects using Rhino, and would happily sacrifice performance for the convenience of passing javascript directly through to the DB. If not, I can always use sleepymongoose or something, but I don't really want to add yet another language (python) to the stack at this point. Any insights are appreciated.

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  • Java projects without swing

    - by Jeff Home
    I'm quite familiar with Java and I would like to work on a project on my free time but for some reason, I just hate having to work with swing. I'm wondering what kind of Java technologies are available out there that I can use for starting a project. Thank you.

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  • Deprecate in Java 1.6

    - by iano
    In Java 1.5, to deprecate a method you would: @Deprecated int foo(int bar) { } Compiling this in Java 1.6 results in the following: Syntax error, annotations are only available if source level is 1.5 Any ideas?

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  • java RSA Multiple Encryption

    - by user1763730
    I encrypt my message with a symmetric key and the symmetric key itself has to be further encrypted with different RSA public keys. When I tried to implement the above I got the following error: javax.crypto.IllegalBlockSizeException: The input was invalid: Invalid input length. at com.rsa.shareCrypto.j.hD.engineDoFinal(Unknown Source) at javax.crypto.Cipher.doFinal(Cipher.java:2087) at wrap1.main(wrap1.java:69) Is there a way to solve this problem ?

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  • Java reference storage question

    - by aab
    In java, when you pass an object to a method as a parameter, it is actually passing a reference, or a pointer, to that object because objects in Java are references. Inside the function, it has a pointer to that object which is a location in memory. I am wondering where this pointer lives in memory? Is a new memory location created once inside the function to hold this reference?

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  • Writing a script in Java?

    - by giri
    I am working with telecom company. I am familiar with Java programming language. But now I have a task to write a script, with Linux operating systems. I have to write a script for fetching data from other computer and check some conditions. How can I do that using Java?

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  • Should I focus on java or on C#

    - by Daniel
    My friend started his computer engineering studies this semester, and wants to know if he should focus on Java or C#? While I am more on the Java side of life, I don't know what to answer him unbiased, so If you can give some unbiased statements on this, this would be great.

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  • Best Java obfuscator ?

    - by Xinus
    I am developing a security software and want to obfuscate my java code so it will become impossible to reverse engineer. What is the most reliable java obfuscator ?

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  • Given an XML which contains a representation of a graph, how to apply it DFS algorithm? [on hold]

    - by winston smith
    Given the followin XML which is a directed graph: <?xml version="1.0" encoding="iso-8859-1" ?> <!DOCTYPE graph PUBLIC "-//FC//DTD red//EN" "../dtd/graph.dtd"> <graph direct="1"> <vertex label="V0"/> <vertex label="V1"/> <vertex label="V2"/> <vertex label="V3"/> <vertex label="V4"/> <vertex label="V5"/> <edge source="V0" target="V1" weight="1"/> <edge source="V0" target="V4" weight="1"/> <edge source="V5" target="V2" weight="1"/> <edge source="V5" target="V4" weight="1"/> <edge source="V1" target="V2" weight="1"/> <edge source="V1" target="V3" weight="1"/> <edge source="V1" target="V4" weight="1"/> <edge source="V2" target="V3" weight="1"/> </graph> With this classes i parsed the graph and give it an adjacency list representation: import java.io.IOException; import java.util.HashSet; import java.util.LinkedList; import java.util.Collection; import java.util.Iterator; import java.util.logging.Level; import java.util.logging.Logger; import practica3.util.Disc; public class ParsingXML { public static void main(String[] args) { try { // TODO code application logic here Collection<Vertex> sources = new HashSet<Vertex>(); LinkedList<String> lines = Disc.readFile("xml/directed.xml"); for (String lin : lines) { int i = Disc.find(lin, "source=\""); String data = ""; if (i > 0 && i < lin.length()) { while (lin.charAt(i + 1) != '"') { data += lin.charAt(i + 1); i++; } Vertex v = new Vertex(); v.setName(data); v.setAdy(new HashSet<Vertex>()); sources.add(v); } } Iterator it = sources.iterator(); while (it.hasNext()) { Vertex ver = (Vertex) it.next(); Collection<Vertex> adyacencias = ver.getAdy(); LinkedList<String> ls = Disc.readFile("xml/graphs.xml"); for (String lin : ls) { int i = Disc.find(lin, "target=\""); String data = ""; if (lin.contains("source=\""+ver.getName())) { Vertex v = new Vertex(); if (i > 0 && i < lin.length()) { while (lin.charAt(i + 1) != '"') { data += lin.charAt(i + 1); i++; } v.setName(data); } i = Disc.find(lin, "weight=\""); data = ""; if (i > 0 && i < lin.length()) { while (lin.charAt(i + 1) != '"') { data += lin.charAt(i + 1); i++; } v.setWeight(Integer.parseInt(data)); } if (v.getName() != null) { adyacencias.add(v); } } } } for (Vertex vert : sources) { System.out.println(vert); System.out.println("adyacencias: " + vert.getAdy()); } } catch (IOException ex) { Logger.getLogger(ParsingXML.class.getName()).log(Level.SEVERE, null, ex); } } } This is another class: import java.util.Collection; import java.util.Objects; public class Vertex { private String name; private int weight; private Collection ady; public Collection getAdy() { return ady; } public void setAdy(Collection adyacencias) { this.ady = adyacencias; } public String getName() { return name; } public void setName(String nombre) { this.name = nombre; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } @Override public int hashCode() { int hash = 7; hash = 43 * hash + Objects.hashCode(this.name); hash = 43 * hash + this.weight; return hash; } @Override public boolean equals(Object obj) { if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } final Vertex other = (Vertex) obj; if (!Objects.equals(this.name, other.name)) { return false; } if (this.weight != other.weight) { return false; } return true; } @Override public String toString() { return "Vertice{" + "name=" + name + ", weight=" + weight + '}'; } } And finally: /** * * @author user */ /* -*-jde-*- */ /* <Disc.java> Contains the main argument*/ import java.io.*; import java.util.LinkedList; /** * Lectura y escritura de archivos en listas de cadenas * Ideal para el uso de las clases para gráficas. * * @author Peralta Santa Anna Victor Miguel * @since Julio 2011 */ public class Disc { /** * Metodo para lectura de un archivo * * @param fileName archivo que se va a leer * @return El archivo en representacion de lista de cadenas */ public static LinkedList<String> readFile(String fileName) throws IOException { BufferedReader file = new BufferedReader(new FileReader(fileName)); LinkedList<String> textlist = new LinkedList<String>(); while (file.ready()) { textlist.add(file.readLine().trim()); } file.close(); /* for(String linea:textlist){ if(linea.contains("source")){ //String generado = linea.replaceAll("<\\w+\\s+\"", ""); //System.out.println(generado); } }*/ return textlist; }//readFile public static int find(String linea,String palabra){ int i,j; boolean found = false; for(i=0,j=0;i<linea.length();i++){ if(linea.charAt(i)==palabra.charAt(j)){ j++; if(j==palabra.length()){ found = true; return i; } }else{ continue; } } if(!found){ i= -1; } return i; } /** * Metodo para la escritura de un archivo * * @param fileName archivo que se va a escribir * @param tofile la lista de cadenas que quedaran en el archivo * @param append el bit que dira si se anexa el contenido o se empieza de cero */ public static void writeFile(String fileName, LinkedList<String> tofile, boolean append) throws IOException { FileWriter file = new FileWriter(fileName, append); for (int i = 0; i < tofile.size(); i++) { file.write(tofile.get(i) + "\n"); } file.close(); }//writeFile /** * Metodo para escritura de un archivo * @param msg archivo que se va a escribir * @param tofile la cadena que quedaran en el archivo * @param append el bit que dira si se anexa el contenido o se empieza de cero */ public static void writeFile(String msg, String tofile, boolean append) throws IOException { FileWriter file = new FileWriter(msg, append); file.write(tofile); file.close(); }//writeFile }// I'm stuck on what can be the best way to given an adjacency list representation of the graph how to apply it Depth-first search algorithm. Any idea of how to aproach to complete the task?

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  • javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp] error with java scheduler

    - by Morgan Azhari
    What I'm trying to do is to update my database after a period of time. So I'm using java scheduler and connection pooling. I don't know why but my code only working once. It will print: init success success javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp]. at org.apache.naming.NamingContext.lookup(NamingContext.java:820) at org.apache.naming.NamingContext.lookup(NamingContext.java:168) at org.apache.naming.SelectorContext.lookup(SelectorContext.java:158) at javax.naming.InitialContext.lookup(InitialContext.java:411) at test.Pool.main(Pool.java:25) ---> line 25 is Context envContext = (Context)initialContext.lookup("java:/comp/env"); I don't know why it only works once. I already test it if I didn't running it without java scheduler and it works fine. No error whatsoerver. Don't know why i get this error if I running it using scheduler. Hope someone can help me. My connection pooling code: public class Pool { public DataSource main() { try { InitialContext initialContext = new InitialContext(); Context envContext = (Context)initialContext.lookup("java:/comp/env"); DataSource datasource = new DataSource(); datasource = (DataSource)envContext.lookup("jdbc/test"); return datasource; } catch (Exception ex) { ex.printStackTrace(); } return null; } } my web.xml: <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <listener> <listener-class> package.test.Pool</listener-class> </listener> <resource-ref> <description>DB Connection Pooling</description> <res-ref-name>jdbc/test</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> Context.xml: <?xml version="1.0" encoding="UTF-8"?> <Context path="/project" reloadable="true"> <Resource auth="Container" defaultReadOnly="false" driverClassName="com.mysql.jdbc.Driver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" initialSize="0" jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer" jmxEnabled="true" logAbandoned="true" maxActive="300" maxIdle="50" maxWait="10000" minEvictableIdleTimeMillis="300000" minIdle="30" name="jdbc/test" password="test" removeAbandoned="true" removeAbandonedTimeout="60" testOnBorrow="true" testOnReturn="false" testWhileIdle="true" timeBetweenEvictionRunsMillis="30000" type="javax.sql.DataSource" url="jdbc:mysql://localhost:3306/database?noAccessToProcedureBodies=true" username="root" validationInterval="30000" validationQuery="SELECT 1"/> </Context> my java scheduler public class Scheduler extends HttpServlet{ public void init() throws ServletException { System.out.println("init success"); try{ Scheduling_test test = new Scheduling_test(); ScheduledExecutorService executor = Executors.newScheduledThreadPool(100); ScheduledFuture future = executor.scheduleWithFixedDelay(test, 1, 60 ,TimeUnit.SECONDS); }catch(Exception e){ e.printStackTrace(); } } } Schedule_test public class Scheduling_test extends Thread implements Runnable{ public void run(){ Updating updating = new Updating(); updating.run(); } } updating public class Updating{ public void run(){ ResultSet rs = null; PreparedStatement p = null; StringBuilder sb = new StringBuilder(); Pool pool = new Pool(); Connection con = null; DataSource datasource = null; try{ datasource = pool.main(); con=datasource.getConnection(); sb.append("SELECT * FROM database"); p = con.prepareStatement(sb.toString()); rs = p.executeQuery(); rs.close(); con.close(); p.close(); datasource.close(); System.out.println("success"); }catch (Exception e){ e.printStackTrace(); } }

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  • Apache Tiles vs OpenSymphony SiteMesh

    - by Bytecode Ninja
    It's been a long time since I used SiteMesh or Tiles in a Java Web app and I've almost forgotten all the architectural differences as well as the weaknesses and strengths of these frameworks. My question is: which one is a better choice for building JSP/Servlet based Web apps or for use with Struts2? Why? And are there any weaknesses that I should be aware of? Are there any better alternatives available at all? Thanks in advance.

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  • Image rotation algorithm

    - by Stefano Driussi
    I'm looking for an algorithm that rotates an image by some degrees (input). public Image rotateImage(Image image, int degrees) (Image instances could be replaced with int[] containing each pixel RGB values, My problem is that i need to implement it for a JavaME MIDP 2.0 project so i must use code runnable on JVM prior to version 1.5 Can anyone help me out with this ? EDIT: I forgot to mention that i don't have SVG APIs available and that i need a method to rotate by arbitrary degree other than 90 - 180- 270 Also, no java.awt.* packages are available on MIDP 2.0

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  • Weblogic Bea 10.0 M1 and WorkManager

    - by ma-ver-ick
    Hi there! I have to execute long running threads in a WebLogic Bea 10.0 M1 server environment. I tried to use WorkManagers for this. Using an own WorkManager allows me to specify my own thread timeout (MaxThreadStuckTime) instead of adjusting the timeout for the whole business application. My setup is as follows: weblogic-ejb-jar.xml: <?xml version="1.0" encoding="UTF-8"?> <weblogic-ejb-jar xmlns="http://www.bea.com/ns/weblogic/90" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/90 http://www.bea.com/ns/weblogic/90/weblogic-ejb-jar.xsd"> <weblogic-enterprise-bean> <ejb-name>TestBean</ejb-name> <resource-description> <res-ref-name>myWorkManager</res-ref-name> <jndi-name>wm/myWorkManager</jndi-name> </resource-description> </weblogic-enterprise-bean> </weblogic-ejb-jar> weblogic-application.xml: <?xml version="1.0" encoding="UTF-8"?> <weblogic xmlns="http://www.bea.com/ns/weblogic/90" xmlns:j2ee="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/90 http://www.bea.com/ns/weblogic/90/weblogic.xsd"> <work-manager> <name>myWorkManager</name> <ignore-stuck-threads>1</ignore-stuck-threads> </work-manager> </weblogic> and the Bean: import javax.annotation.Resource; import javax.ejb.Stateful; import weblogic.work.WorkManager; @Stateful(mappedName = "TestBean") public class TestBean implements TestBeanRemote { @Resource(name = "myWorkManager") private WorkManager myWorkManager; public void test() { myWorkManager.schedule(new Runnable() { public void run() { while (true) { System.out.println("test: +++++++++++++++++++++++++"); try { Thread.sleep(45000); } catch (InterruptedException e) { e.printStackTrace(); } } } }); } } When I try to deploy this things, the server gives me the following exceptions: [EJB:011026]The EJB container failed while creating the java:/comp/env namespace for this EJB deployment. weblogic.deployment.EnvironmentException: [EJB:010176]The resource-env-ref 'myWorkManager' declared in the ejb-jar.xml descriptor has no JNDI name mapped to it. The resource-ref must be mapped to a JNDI name using the resource-description element of the weblogic-ejb-jar.xml descriptor. I try to figure out how to access / use WorkMangers for days now, and still get this or that as an exception. Very frustrating! Thanks in advance!

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  • java Finalize method call

    - by Rajesh Kumar J
    The following is my Class code import java.net.*; import java.util.*; import java.sql.*; import org.apache.log4j.*; class Database { private Connection conn; private org.apache.log4j.Logger log ; private static Database dd=new Database(); private Database(){ try{ log= Logger.getLogger(Database.class); Class.forName("com.mysql.jdbc.Driver"); conn=DriverManager.getConnection("jdbc:mysql://localhost/bc","root","root"); conn.setReadOnly(false); conn.setAutoCommit(false); log.info("Datbase created"); /*Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); conn=DriverManager.getConnection("jdbc:odbc:rmldsn"); conn.setReadOnly(false); conn.setAutoCommit(false);*/ } catch(Exception e){ log.info("Cant Create Connection"); } } public static Database getDatabase(){ return dd; } public Connection getConnection(){ return conn; } @Override protected void finalize()throws Throwable { try{ conn.close(); Runtime.getRuntime().gc(); log.info("Database Close"); } catch(Exception e){ log.info("Cannot be closed Database"); } finally{ super.finalize(); } } } This can able to Initialize Database Object only through getDatabase() method. The below is the program which uses the single Database connection for the 4 threads. public class Main extends Thread { public static int c=0; public static int start,end; private int lstart,lend; public static Connection conn; public static Database dbase; public Statement stmt,stmtEXE; public ResultSet rst; /** * @param args the command line arguments */ static{ dbase=Database.getDatabase(); conn=dbase.getConnection(); } Main(String s){ super(s); try{ stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE); start=end; lstart=start; end=end+5; lend=end; System.out.println("Start -" +lstart +" End-"+lend); } catch(Exception e){ e.printStackTrace(); } } @Override public void run(){ try{ URL url=new URL("http://localhost:8084/TestWeb/"); rst=stmt.executeQuery("SELECT * FROM bc.cdr_calltimestamp limit "+lstart+","+lend); while(rst.next()){ try{ rst.updateInt(2, 1); rst.updateRow(); conn.commit(); HttpURLConnection httpconn=(HttpURLConnection) url.openConnection(); httpconn.setDoInput(true); httpconn.setDoOutput(true); httpconn.setRequestProperty("Content-Type", "text/xml"); //httpconn.connect(); String reqstring="<?xml version=\"1.0\" encoding=\"US-ASCII\"?>"+ "<message><sms type=\"mt\"><destination messageid=\"PS0\"><address><number" + "type=\"international\">"+ rst.getString(1) +"</number></address></destination><source><address>" + "<number type=\"unknown\"/></address></source><rsr type=\"success_failure\"/><ud" + "type=\"text\">Hello World</ud></sms></message>"; httpconn.getOutputStream().write(reqstring.getBytes(), 0, reqstring.length()); byte b[]=new byte[httpconn.getInputStream().available()]; //System.out.println(httpconn.getContentType()); httpconn.getInputStream().read(b); System.out.println(Thread.currentThread().getName()+new String(" Request"+rst.getString(1))); //System.out.println(new String(b)); httpconn.disconnect(); Thread.sleep(100); } catch(Exception e){ e.printStackTrace(); } } System.out.println(Thread.currentThread().getName()+" "+new java.util.Date()); } catch(Exception e){ e.printStackTrace(); } } public static void main(String[] args) throws Exception{ System.out.println(new java.util.Date()); System.out.println("Memory-before "+Runtime.getRuntime().freeMemory()); Thread t1=new Main("T1-"); Thread t2=new Main("T2-"); Thread t3=new Main("T3-"); Thread t4=new Main("T4-"); t1.start(); t2.start(); t3.start(); t4.start(); System.out.println("Memory-after "+Runtime.getRuntime().freeMemory()); } } I need to Close the connection after all the threads gets executed. Is there any good idea to do so. Kindly help me out in getting this work.

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