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• Simple but efficient way to store a series of small changes to an image?

  - by finnw

  I have a series of images. Each one is typically (but not always) similar to the previous one, with 3 or 4 small rectangular regions updated. I need to record these changes using a minimum of disk space. The source images are not compressed, but I would like the deltas to be compressed. I need to be able to recreate the images exactly as input (so a lossy video codec is not appropriate.) I am thinking of something along the lines of: Composite the new image with a negative of the old image Save the composited image in any common format that can compress using RLE (probably PNG.) Recreate the second image by compositing the previous image with the delta. Although the images have an alpha channel, I can ignore it for the purposes of this function. Is there an easy-to-implement algorithm or free Java library with this capability?

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• Error preparing statement in Jasper

  - by Augusto

  Hi, I'm trying to create a report with Jasper, but I keep getting this exception when running from my app (runs ok from IReport): net.sf.jasperreports.engine.JRException: Error preparing statement for executing the report query Here's the query I'm using: SELECT produtos.`Descricao` AS produtos_Descricao, saidas.`Quantidade` AS saidas_Quantidade, saidas.`Data` AS saidas_Data, motivossaidas.`Motivo` AS motivossaidas_Motivo FROM `produtos` produtos INNER JOIN `saidas` saidas ON produtos.`Id` = saidas.`Id_Produto` INNER JOIN `motivossaidas` motivossaidas ON saidas.`Id_MotivoSaida` = motivossaidas.`id` WHERE motivossaidas.`motivo` = $P{MOTIVO} and the parameter definition: <parameter name="MOTIVO" class="java.lang.String"/> The exception occurs when I do JasperPrint jasperPrint = JasperFillManager.fillReport(relatorio, parametros); where relatorio is a JasperReport object loaded with JRLoader.loadObject(URL) and parametros is a HashMap with the following key/values: REPORT_CONNECTION = MySQL JDBC connection, MOTIVO = "Venda" I really don't know what to do here. I keep getting the exception event if I use a query without any parameters. Why do I get this exception? What should I do here? Thanks!

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• Guice creates Swing components outside of UI thread problem?

  - by Boris Pavlovic

  I'm working on Java Swing application with Google Guice as an IOC container. Things are working pretty well. There are some UI problems. When a standard L&F is replaced with Pushing pixels Substance L&F application is not running due to Guice's Swing components creation outside of UI thread. Is there a way to tell Guice to create Swing components in the UI thread? Maybe I should create custom providers which will return Swing components after SwingUtilities.invokeAndWait(Runnable) creates them. I don't like the idea of running the whole application in UI thread, but maybe it's just a perfect solution.

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• How to use third party themes in swing application?

  - by swift

  I want to use some third party themes (like synthetica http://www.javasoft.de/synthetica/themes/) in my swing appliaction. i am using eclipse ide, got the jar file of theme and did the following modification(according to the readme file from the theme) in my code try { UIManager.setLookAndFeel(new SyntheticaBlackMoonLookAndFeel()); } catch (Exception e) { e.printStackTrace(); } but after this modification its showing the following error The type de.javasoft.plaf.synthetica.SyntheticaLookAndFeel cannot be resolved. It is indirectly referenced from required .class files what does this mean? i tried searching on net but cant really find any useful answers Contents of Readme file: System Requirements =================== Java SE 5 (JRE 1.5.0) or above Synthetica V2.2.0 or above Integration =========== 1. Ensure that your classpath contains all Synthetica libraries (including Synthetica's core library 'synthetica.jar'). 2. Enable the Synthetica Look and Feel at startup time in your application: import de.javasoft.plaf.synthetica.SyntheticaBlackMoonLookAndFeel; try { UIManager.setLookAndFeel(new SyntheticaBlackMoonLookAndFeel()); } catch (Exception e) { e.printStackTrace(); }

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• Seam cache provider with ehcache null

  - by Cateno Viglio

  Hi every one, I'm trying to configure seam/ehcache following the tutorial from jboss page: http://docs.jboss.org/seam/2.1.2/reference/en-US/html/cache.html I put the ehcache.1.2.3.jar in project.ear/lib and injected CacheProvider as especified, but the CacheProvider always return null. The documentation doesn't show any aditional configuration for ehcache, just for jboss cache. I am probably doing something wrong, it's impossible be so easy :). besides put the jar in /lib, i created the following seam component to test: @Scope(ScopeType.SESSION) @Name("cacheBean") public class CacheSeamBean implements java.io.Serializable { @In(required=false, create=true) private EntityManager em; @Logger private Log log; @In private Events events; @In CacheProvider cacheProvider; Boolean blLoaded = Boolean.FALSE; @Create public void buscar() { if (!blLoaded){ List<Parametro> lstParametro = em.createQuery("select p from Parametro p").getResultList(); for (Parametro parametro : lstParametro){ cacheProvider.put(parametro.getCodigo(), parametro.getValor()); } blLoaded= Boolean.TRUE; } } } Thanks

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• Rotate a 2d matrix to the right

  - by adam

  I want a 2d matrix to rotate to the right, it compiles fine but when I try to the run it freezes. For example I want {{10,20,30},{40,50,60}} to rotate into {{40,10},{50,20},{60,30}} import java.util.*; public class Rotate{ public static int[][] rotate(int[][] m) { int [][] rotateM = new int[m[0].length][m.length]; for (int i= 0; i< m.length; i= i++){ for (int j= 0; j< m[0].length; j= j++){ rotateM[i][j] = m[j][m.length-i-1]; } } return rotateM; } public static void main(String[]args){ int[][]m = {{10,20,30}, {40,50,60}}; System.out.println(Arrays.toString(rotate(m))); } }

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• How to make a loop over all keys of a HashMap?

  - by Roman

  I try to do it in the following way: public String getValue(String service, String parameter) { String inputKey = service + ":" + parameter; Set keys = name2value.keySet(); Iterator itr = keys.iterator(); while (itr.hasNext()) { if (inputKey.equal(itr.next())) { return name2value.get(inputKey); } return ""; } } And I get an error message: cannot find symbol method.equal(java.lang.Object). I think it is because itr.next() is not considered as a string. How can I solve this problem? I tried to replace Set keys by Set<String> keys. It did not help.

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• Type-safe, generic, empty Collections with static generics

  - by Droo

  I return empty collections vs. null whenever possible. I switch between two methods for doing so using java.util.Collections: return Collections.EMPTY_LIST; return Collections.emptyList(); where emptyList() is supposed to be type-safe. But I recently discovered: return Collections.<ComplexObject> emptyList(); return Collections.<ComplexObject> singletonList(new ComplexObject()); etc. I see this method in Eclipse Package Explorer: <clinit> () : void but I don't see how this is done in the source code (1.5). How is this magic tomfoolerie happening!!

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• How to center align background image in JPanel

  - by Jaguar

  I wanted to add background image to my JFrame. Background image means I can later add Components on the JFrame or JPanel Although I coudn't find how to add background image to a JFrame, I found out how to add background image to a JPanel from here: How to set background image in Java? This solved my problem, but now since my JFrame is resizable I want to keep the image in center. The code I found uses this method public void paintComponent(Graphics g) { //Draw the previously loaded image to Component. g.drawImage(img, 0, 0, null); //Draw image } Can anyone say how to align the image to center of the JPanel. As g.drawImage(img, 0, 0, null); provides x=0 and y=0 Also if there is a method to add background image to a JFrame then I would like to know. Thanks.

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• How to terminate a JBPM processInstance

  - by jie-wang

  Hi all I'm using JBPM 4.3 and trying hard to find a way to terminate one processInstance. First I simply used something like: executionService.endProcessInstance(processInstanceID, "active"); However I got exception thrown out. "exception while executing command org.jbpm.pvm.internal.cmd.EndProcessInstance java.lang.NullPointerException" Then I googled to find this post http://community.jboss.org/thread/146478, which didn't seem to give a resolution. I tried nevertheless to end all executions of the processInstance by calling ((ExecutionImpl) execution).end(); But the same exception was thrown again when I finally try to call executionService.endProcessInstance(processInstanceID, "active"); Did anyone have the same experience and solution?

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• Is lock returned by ReentrantReadWriteLock equivalent to it's read and write locks?

  - by Todd

  Hello, I have been looking around for the answer to this, but no joy. In Java, is using the lock created by ReentrantReadWriteLock equivalent to getting the read and write locks as returned by readLock.lock() and writeLock.lock()? In other words, can I expect the read and write locks associated with the ReentrantReadWriteLock to be requested and held by synchronizing on the ReentrantReadWriteLock? My gut says "no" since any object can be used for synchronization. I wouldn't think that there would be special behavior for ReentrantReadWriteLock. However, special behavior is the corner case of which I may not be aware. Thanks, Todd

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• Multiple complete HTTP requests stuck in TCP CLOSE_WAIT state

  - by Sean Owen

  I have a Java and Tomcat-based server application which initiates many outbound HTTP requests to other web sites. We use Jakarta's HTTP Core/Client libraries, very latest versions. The server locks up at some point since all its worker threads are stuck trying to close completed HTTP connections. Using 'lsof' reveals a bunch of sockets stuck in TCP CLOSE_WAIT state. This doesn't happen for all, or even most connections. In fact, I saw it before and resolved it by making sure to set the Connection: Close response header. So that makes me think it may be bad behavior of remote servers. It may have come up again since I moved the app to a totally new service provider -- different OS, network situation. But, I am still at a loss as to what I could do, if anything, to work around this. Some poking around on the internet didn't turn up anything I'm not already doing. Just thought I'd ask if anyone has seen and solved this?

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• Why does Spring Security's BindAuthenticator require read permissions for users?

  - by Thomas

  Hi all, I'm currently implementing/configuring the LDAP authentication of a Java web application using Spring Security 3.0. I'm using Microsoft AD LDS as LDAP server and chose the Spring's BindAuthenticator. I found out that the authentication only works if the authenticated user is a member of the partition's Readers role. The BindAuthenticator tries to read the user's attributes after the authentication, which seems reasonable in scenarios where authorities are retrieved from the directory service. Being new to LDAP and AD, is this an acceptable practise when the application is integrated in an existing AD structure? Can fine-tune an give the user dns only read permissions for their own attributes rather than adding them to the Reader group? Thanks Thomas

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• Ant ignores attempt to override the LANG environment variable

  - by Steen

  We need to test a java build with the languages set to different values. I can manually (i.e. via export LANG=en_DK.UTF-8 and export LANG=en_DK) test that the unit tests run with the ant build script behaves differently, but I need to set the environment variable from ant. I have tried setting it using these methods (with the shell $LANG set to en_DK.UTF-8): using -D on the command line: ant -DLANG=en_DK using a build.properties file with the line LANG=en_DK in it using the following statements in the build.xml file (sorry for the formatting, I can't get SO to display it otherwise): : <property environment="ANTENV"/> <property name="ANTENV.LANG" value="en_DK"/> Using any of the three possibilities, and when run with -debug, ant reports that: Override ignored for property "LANG" What can I do to set the LANG environment variable from within ant?

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• How can I further optimize this color difference function?

  - by aLfa

  I have made this function to calculate color differences in the CIE Lab colorspace, but it lacks speed. Since I'm not a Java expert, I wonder if any Java guru around has some tips that can improve the speed here. The code is based on the matlab function mentioned in the comment block. /** * Compute the CIEDE2000 color-difference between the sample color with * CIELab coordinates 'sample' and a standard color with CIELab coordinates * 'std' * * Based on the article: * "The CIEDE2000 Color-Difference Formula: Implementation Notes, * Supplementary Test Data, and Mathematical Observations,", G. Sharma, * W. Wu, E. N. Dalal, submitted to Color Research and Application, * January 2004. * available at http://www.ece.rochester.edu/~gsharma/ciede2000/ */ public static double deltaE2000(double[] lab1, double[] lab2) { double L1 = lab1[0]; double a1 = lab1[1]; double b1 = lab1[2]; double L2 = lab2[0]; double a2 = lab2[1]; double b2 = lab2[2]; // Cab = sqrt(a^2 + b^2) double Cab1 = Math.sqrt(a1 * a1 + b1 * b1); double Cab2 = Math.sqrt(a2 * a2 + b2 * b2); // CabAvg = (Cab1 + Cab2) / 2 double CabAvg = (Cab1 + Cab2) / 2; // G = 1 + (1 - sqrt((CabAvg^7) / (CabAvg^7 + 25^7))) / 2 double CabAvg7 = Math.pow(CabAvg, 7); double G = 1 + (1 - Math.sqrt(CabAvg7 / (CabAvg7 + 6103515625.0))) / 2; // ap = G * a double ap1 = G * a1; double ap2 = G * a2; // Cp = sqrt(ap^2 + b^2) double Cp1 = Math.sqrt(ap1 * ap1 + b1 * b1); double Cp2 = Math.sqrt(ap2 * ap2 + b2 * b2); // CpProd = (Cp1 * Cp2) double CpProd = Cp1 * Cp2; // hp1 = atan2(b1, ap1) double hp1 = Math.atan2(b1, ap1); // ensure hue is between 0 and 2pi if (hp1 < 0) { // hp1 = hp1 + 2pi hp1 += 6.283185307179586476925286766559; } // hp2 = atan2(b2, ap2) double hp2 = Math.atan2(b2, ap2); // ensure hue is between 0 and 2pi if (hp2 < 0) { // hp2 = hp2 + 2pi hp2 += 6.283185307179586476925286766559; } // dL = L2 - L1 double dL = L2 - L1; // dC = Cp2 - Cp1 double dC = Cp2 - Cp1; // computation of hue difference double dhp = 0.0; // set hue difference to zero if the product of chromas is zero if (CpProd != 0) { // dhp = hp2 - hp1 dhp = hp2 - hp1; if (dhp > Math.PI) { // dhp = dhp - 2pi dhp -= 6.283185307179586476925286766559; } else if (dhp < -Math.PI) { // dhp = dhp + 2pi dhp += 6.283185307179586476925286766559; } } // dH = 2 * sqrt(CpProd) * sin(dhp / 2) double dH = 2 * Math.sqrt(CpProd) * Math.sin(dhp / 2); // weighting functions // Lp = (L1 + L2) / 2 - 50 double Lp = (L1 + L2) / 2 - 50; // Cp = (Cp1 + Cp2) / 2 double Cp = (Cp1 + Cp2) / 2; // average hue computation // hp = (hp1 + hp2) / 2 double hp = (hp1 + hp2) / 2; // identify positions for which abs hue diff exceeds 180 degrees if (Math.abs(hp1 - hp2) > Math.PI) { // hp = hp - pi hp -= Math.PI; } // ensure hue is between 0 and 2pi if (hp < 0) { // hp = hp + 2pi hp += 6.283185307179586476925286766559; } // LpSqr = Lp^2 double LpSqr = Lp * Lp; // Sl = 1 + 0.015 * LpSqr / sqrt(20 + LpSqr) double Sl = 1 + 0.015 * LpSqr / Math.sqrt(20 + LpSqr); // Sc = 1 + 0.045 * Cp double Sc = 1 + 0.045 * Cp; // T = 1 - 0.17 * cos(hp - pi / 6) + // + 0.24 * cos(2 * hp) + // + 0.32 * cos(3 * hp + pi / 30) - // - 0.20 * cos(4 * hp - 63 * pi / 180) double hphp = hp + hp; double T = 1 - 0.17 * Math.cos(hp - 0.52359877559829887307710723054658) + 0.24 * Math.cos(hphp) + 0.32 * Math.cos(hphp + hp + 0.10471975511965977461542144610932) - 0.20 * Math.cos(hphp + hphp - 1.0995574287564276334619251841478); // Sh = 1 + 0.015 * Cp * T double Sh = 1 + 0.015 * Cp * T; // deltaThetaRad = (pi / 3) * e^-(36 / (5 * pi) * hp - 11)^2 double powerBase = hp - 4.799655442984406; double deltaThetaRad = 1.0471975511965977461542144610932 * Math.exp(-5.25249016001879 * powerBase * powerBase); // Rc = 2 * sqrt((Cp^7) / (Cp^7 + 25^7)) double Cp7 = Math.pow(Cp, 7); double Rc = 2 * Math.sqrt(Cp7 / (Cp7 + 6103515625.0)); // RT = -sin(delthetarad) * Rc double RT = -Math.sin(deltaThetaRad) * Rc; // de00 = sqrt((dL / Sl)^2 + (dC / Sc)^2 + (dH / Sh)^2 + RT * (dC / Sc) * (dH / Sh)) double dLSl = dL / Sl; double dCSc = dC / Sc; double dHSh = dH / Sh; return Math.sqrt(dLSl * dLSl + dCSc * dCSc + dHSh * dHSh + RT * dCSc * dHSh); }

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• h:commandButton not working within PrimeFaces p:dataTable

  - by JamesB

  I have a PrimeFaces datatable. For each row in this table, I want to allow the user to update/delete the row entry (a user). <html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:p="http://primefaces.prime.com.tr/ui"> <h:head> <link type="text/css" rel="stylesheet" href="themes/bluesky/skin.css" /> </h:head> <h:body> <center> <h:form> <p:panel id="viewUsersPanel" header="View Users"> <p:dataTable var="user" value="#{uController.users}" emptyMessage="No Users Found."> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="Name" /> </f:facet> <h:outputText value="#{user.name}" /> </p:column> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="Postal Address" /> </f:facet> <h:outputText value="#{user.address}" /> </p:column> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="Phone Number" /> </f:facet> <h:outputText value="#{user.phone}" /> </p:column> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="Email Address" /> </f:facet> <h:outputText value="#{user.email}" /> </p:column> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="DOB" /> </f:facet> <h:outputText value="#{user.dob}"> <f:convertDateTime pattern="dd-MMM-yyyy" /> </h:outputText> </p:column> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="No. Memberships" /> </f:facet> <h:outputText value="#{user.numberOfMemberships}" /> </p:column> <p:column style="text-align: center;"> <f:facet name="header"> <h:outputText value="Actions" /> </f:facet> <h:commandButton value="Update" action="#{uController.update}" /> <h:commandButton value="Delete" action="#{uController.delete}" /> </p:column> </p:dataTable> <h:panelGrid columns="2" cellpadding="2" id="footerPanelGrid" border="0"> <h:commandButton action="#{uController.home}" value="Home Page" /> </h:panelGrid> </p:panel> </h:form> </center> </h:body> </html> However, neither of the buttons work. Instead they appear to simply refresh the view page. I have ran the app in debug and neither update or delete method is hit. I suspect this may be due to using h:commandButton within a p:dataTable. However, I have also tried p:commandButton but to no avail. For reference, here is a snippet of the UserController class: @ManagedBean(name="uController") public class UserController extends AbstractController { private Collection<User> users; ... public String update() { System.out.println("Ready for update"); return "update-user"; } public String delete() { System.out.println("Ready for delete"); return "delete-user"; } ... }

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• Estimate serialization size of objects?

  - by Stefan K.

  In my thesis, I woud like to enhance messaging in a cluster. It's important to log runtime information about how big a message is (should I prefer processing local or remote). I could just find frameoworks about estimating the object memory size based on java instrumentation. I've tested classmexer, which didn't come close to the serialization size and sourceforge SizeOf. In a small testcase, SizeOf was around 10% wrong and 10x faster than serialization. (Still transient breaks the estimation completely and since e.g. ArrayList is transient but is serialized as an Array, it's not easy to patch SizeOf. But I could live with that) On the other hand, 10x faster with 10% error doesn't seem very good. Any ideas how I could do better?

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• How to display characters in http get response correctly with the right encoding

  - by DixieFlatline

  Hello! Does anyone know how to read c,š,ž characters in http get response properly? When i make my request in browser the browser displays all characters correctly. But in java program with apache jars i don't know how to set the encoding right. I tried with client.getParams().setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, "UTF-8"); but it's not working. My code: HttpClient client = new DefaultHttpClient(); String getURL = "http://www.google.com"; HttpGet get = new HttpGet(getURL); HttpResponse responseGet = client.execute(get); HttpEntity resEntityGet = responseGet.getEntity(); if (resEntityGet != null) { Log.i("GET RESPONSE",EntityUtils.toString(resEntityGet)); } } catch (Exception e) { e.printStackTrace(); }

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• Are there any tools to help the user to design a State Machine to be consumed by my application?

  - by kolrie

  When reading this question I remembered there was something I have been researching for a while now and I though Stackoverflow could be of help. I have created a framework that handles applications as state machines. Currently all the state business logic and transactions are handled via Java code. I was looking for some UI implementation that would allow the user to draw the state machines and transactions and generate a file that can later on be consumed by my framework to "run" the workflow according to one or more defined state machines. Ideally I would like to use an open standard like SCXML. The goal as the UI would be to have something like this plugin IBM have for Rational Software Architect: Do you know any editor, plugin or library that would have something similar or at least serve as a good starting point?

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• Techniques to avoid DeadlineExceededException in GAE/J?

  - by Tahir Akram

  I am developing an Twitter4J web application in Google App Engine/Java. I need to show two lists. One is Twitter friends and other is followers. With photo and screen name. It is working fine for people who have 20-30 followers and friends. But it gave me DeadlineExceededException when I try a user who has 150+ followers and friends. GAE throws this exception if web request take time more than 30 seconds. So what techniques I can adopt to avoid this exception. Should I generate two AJAX calls for each of my list. After page loads. So that every call will have its own 30 secs limit? Or what else you think? I am gone make it. Please help.

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• Verify mail server connection programmatically

  - by Sergii

  I'm using custom SMTP servers and would like to verify the connection when user enters his own server credentials. Exactly the same type of check as Adobe CF and Railo allow to do when adding mail server. Sure, this does not guarantee that delivery will be working, but at least to check that entered server/username/pass are valid. I can see one tricky way: try to send the email with cfmail and check the mail log. But I believe that it can be done with more elegant. Is there any Java library available with standard ACF/Railo distro to help me? How would I use them? Examples are highly appreciated. Thanks in advance.

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• Maven eclipse does not add a dependency

  - by Calm Storm

  I have the following snippet in my pom.xml <dependency> <groupId>aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.5.3</version> </dependency> and in one of my Java files I refer a class org.aspectj.lang.ProceedingJoinPoint. When I do a "mvn clean install" it compiles and builds fine but when I do an eclipse:eclipse, and import the project in eclipse it gives me an error The import org.aspectj cannot be resolved. I checked the .classpath file that was generated and it does not have an entry to this file. I tried a "mvn dependency:tree" and it lists this fine. Can someone tell me what is going wrong here?

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• Learn mp3 format and audio signal processing

  - by Shankhoneer Chakrovarty

  I am trying to learn the following things: How mp3 file looks like internally? I found this: http://mpgedit.org/mpgedit/mpeg_format/MP3Format.html but it seems old. Is there any recent changes to the format? I couldnt find any. How to open a mp3 file in java and look for bytes? I tried using audiostream but I am getting a lot of zeros and signed short integers which nowhere resemble the header/body format as mentioned in the above link. Am I wrong in interpreting the bytes? How to get amplitude, frequency and pitch of a mp3 file? No idea. Can you please suggest some book or tutorial? Can you please help me in getting the solution for the above questions? I am sorry if some questions appear to be naive, I am a just begun to learn mp3. Thanks

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• mappedBy reference an unknown target entity property - hibernate error

  - by tommy

  first, my classes: User package com.patpuc.model; import java.util.List; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.OneToMany; import javax.persistence.Table; import com.patpuc.model.RolesMap; @Entity @Table(name = "users") public class User { @Id @Column(name = "USER_ID", unique = true, nullable = false) private int user_id; @Column(name = "NAME", nullable = false) private String name; @Column(name = "SURNAME", unique = true, nullable = false) private String surname; @Column(name = "USERNAME_U", unique = true, nullable = false) private String username_u; // zamiast username @Column(name = "PASSWORD", unique = true, nullable = false) private String password; @Column(name = "USER_DESCRIPTION", nullable = false) private String userDescription; @Column(name = "AUTHORITY", nullable = false) private String authority = "ROLE_USER"; @Column(name = "ENABLED", nullable = false) private int enabled; @OneToMany(mappedBy = "rUser") private List<RolesMap> rolesMap; public List<RolesMap> getRolesMap() { return rolesMap; } public void setRolesMap(List<RolesMap> rolesMap) { this.rolesMap = rolesMap; } /** * @return the user_id */ public int getUser_id() { return user_id; } /** * @param user_id * the user_id to set */ public void setUser_id(int user_id) { this.user_id = user_id; } /** * @return the name */ public String getName() { return name; } /** * @param name * the name to set */ public void setName(String name) { this.name = name; } /** * @return the surname */ public String getSurname() { return surname; } /** * @param surname * the surname to set */ public void setSurname(String surname) { this.surname = surname; } /** * @return the username_u */ public String getUsername_u() { return username_u; } /** * @param username_u * the username_u to set */ public void setUsername_u(String username_u) { this.username_u = username_u; } /** * @return the password */ public String getPassword() { return password; } /** * @param password * the password to set */ public void setPassword(String password) { this.password = password; } /** * @return the userDescription */ public String getUserDescription() { return userDescription; } /** * @param userDescription * the userDescription to set */ public void setUserDescription(String userDescription) { this.userDescription = userDescription; } /** * @return the authority */ public String getAuthority() { return authority; } /** * @param authority * the authority to set */ public void setAuthority(String authority) { this.authority = authority; } /** * @return the enabled */ public int getEnabled() { return enabled; } /** * @param enabled * the enabled to set */ public void setEnabled(int enabled) { this.enabled = enabled; } @Override public String toString() { StringBuffer strBuff = new StringBuffer(); strBuff.append("id : ").append(getUser_id()); strBuff.append(", name : ").append(getName()); strBuff.append(", surname : ").append(getSurname()); return strBuff.toString(); } } RolesMap.java package com.patpuc.model; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; import com.patpuc.model.User; @Entity @Table(name = "roles_map") public class RolesMap { private int rm_id; private String username_a; private String username_l; //private String username_u; private String password; private int role_id; @ManyToOne @JoinColumn(name="username_u", nullable=false) private User rUser; public RolesMap(){ } /** * @return the user */ public User getUser() { return rUser; } /** * @param user the user to set */ public void setUser(User rUser) { this.rUser = rUser; } @Id @Column(name = "RM_ID", unique = true, nullable = false) public int getRmId() { return rm_id; } public void setRmId(int rm_id) { this.rm_id = rm_id; } @Column(name = "USERNAME_A", unique = true) public String getUsernameA() { return username_a; } public void setUsernameA(String username_a) { this.username_a = username_a; } @Column(name = "USERNAME_L", unique = true) public String getUsernameL() { return username_l; } public void setUsernameL(String username_l) { this.username_l = username_l; } @Column(name = "PASSWORD", unique = true, nullable = false) public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Column(name = "ROLE_ID", unique = true, nullable = false) public int getRoleId() { return role_id; } public void setRoleId(int role_id) { this.role_id = role_id; } } when i try run this on server i have exception like this: Error creating bean with name 'SessionFactory' defined in ServletContext resource [/WEB-INF/classes/baseBeans.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.patpuc.model.RolesMap.users in com.patpuc.model.User.rolesMap But i don't exaclu know what i'm doing wrong. Can somebody help me fix this problem?

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• How to compare two maps by their values

  - by lewap

  How to compare two maps by their values? I have two maps containing equal values and want to compare them by their values. Here is an example: Map a = new HashMap(); a.put("f"+"oo", "bar"+"bar"); a.put("fo"+"o", "bar"+"bar"); Map b = new HashMap(); a.put("f"+"oo", "bar"+"bar"); a.put("fo"+"o", "bar"+"bar"); System.out.println("equals: " + a.equals(b)); // obviously false .... what to call to obtain a true? Obviously, to implement a comparison it not difficult, it is enough to compare all keys and their associated values. I don't believe I'm the first one to do this, so there must be already a library functions either in java or in one of the jakarta.commons libraries. Thanks

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