java bear - Page 689 - Developer IT

using Spring JdbcTemplate for multiple database operations

- by Joel Carranza

I like the apparent simplicity of JdbcTemplate but am a little confused as to how it works. It appears that each operation (query() or update()) fetches a connection from a datasource and closes it. Beautiful, but how do you perform multiple SQL queries within the same connection? I might want to perform multiple operations in sequence (for example SELECT followed by an INSERT followed by a commit) or I might want to perform nested queries (SELECT and then perform a second SELECT based on result of each row). How do I do that with JdbcTemplate. Am I using the right class?

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listFiles() of File not working on symbolic links?

- by Joset

I have the following File object pointing to a directory via symbolic link, File directory = new File("/path/symlink/foo/bar"); String[] files = directory.listFiles(); listFiles() returns null, is this because of the symlink? if yes, how will I go about this if I really want to list the files in bar using the path that contains a symlink?

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String assembly by StringBuilder vs StringWriter and PrintWriter

- by CPerkins

I recently encountered an idiom I haven't seen before: string assembly by StringWriter and PrintWriter. I mean, I know how to use them, but I've always used StringBuilder. Is there a concrete reason for preferring one over the other? The StringBuilder method seems much more natural to me, but is it just style? I've looked at several questions here (including this one which comes closest: http://stackoverflow.com/questions/602279/stringwriter-or-stringbuilder ), but none in which the answers actually address the question of whether there's a reason to prefer one over the other for simple string assembly. This is the idiom I've seen and used many many times: string assembly by StringBuilder: public static String newline = System.getProperty("line.separator"); public String viaStringBuilder () { StringBuilder builder = new StringBuilder(); builder.append("first thing" + newline); builder.append("second thing" + newline); // ... several things builder.append("last thing" + newline); return builder.toString(); } And this is the new idiom: string assembly by StringWriter and PrintWriter: public String viaWriters() { StringWriter stringWriter = new StringWriter(); PrintWriter printWriter = new PrintWriter(stringWriter); printWriter.println("first thing"); printWriter.println("second thing"); // ... several things printWriter.println("last thing"); printWriter.flush(); printWriter.close(); return stringWriter.toString(); }

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Can I can configure cxf to use a specific XML parser?

- by CJS

Is there a way to specify which XML parser cxf uses? Either through the cfx.xml file or programmatically? Our app has the Woodstox parser on its classpath, and cxf seems to be using that by default. However, the Woodstox implementation seems to truncate large Base64 encoded byte arrays in the SOAP packet. Removing Woodstox from the classpath eliminates this truncation problem, but that's not an option right now since other parts of our app also depends on Woodstox. It would be ideal if I could simply tell cxf to use another XML parser. Is this possible?

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Hibernate reverse engineering procedure generated @Temporal(TemporalType.TIMESTAMP) for DateTime

- by EugeneP

Fields in a DB were of type DATETIME (mysql). Why was it generated as a timestamp and will it be regenerated during object persistence? That is not a desired scenario in my case, seeing that as not a timestamp field means that it should only be set via setter, no generation needed, I dont really understand why it did not generate it as Date type!

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MySql timeouts - Should I set autoReconnect=true in Spring application?

- by George

After periods of inactivity on my website (Using Spring 2.5 and MySql), I get the following error: org.springframework.dao.RecoverableDataAccessException: The last packet sent successfully to the server was 52,847,830 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. According to this question, and the linked bug, I shouldn't just set autoReconnect=true. Does this mean I have to catch this exception on any queries I do and then retry the transaction? Should that logic be in the data access layer, or the model layer? Is there an easy way to handle this instead of wrapping every single query to catch this?

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Remove duplicates from a sorted ArrayList while keeping some elements from the duplicates

- by js82

Okay at first I thought this would be pretty straightforward. But I can't think of an efficient way to solve this. I figured a brute force way to solve this but that's not very elegant. I have an ArrayList. Contacts is a VO class that has multiple members - name, regions, id. There are duplicates in ArrayList because different regions appear multiple times. The list is sorted by ID. Here is an example: Entry 0 - Name: John Smith; Region: N; ID: 1 Entry 1 - Name: John Smith; Region: MW; ID: 1 Entry 2 - Name: John Smith; Region: S; ID: 1 Entry 3 - Name: Jane Doe; Region: NULL; ID: 2 Entry 4 - Name: Jack Black; Region: N; ID: 3 Entry 6 - Name: Jack Black; Region: MW; ID: 3 Entry 7 - Name: Joe Don; Region: NE; ID: 4 I want to transform the list to below by combining duplicate regions together for the same ID. Therefore, the final list should have only 4 distinct elements with the regions combined. So the output should look like this:- Entry 0 - Name: John Smith; Region: N,MW,S; ID: 1 Entry 1 - Name: Jane Doe; Region: NULL; ID: 2 Entry 2 - Name: Jack Black; Region: N,MW; ID: 3 Entry 3 - Name: Joe Don; Region: NE; ID: 4 What are your thoughts on the optimal way to solve this? I am not looking for actual code but ideas or tips to go about the best way to get it done. Thanks for your time!!!

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Drools JEE Application

- by Anderson

Anyone build a JEE application using Drools?. I'm not found any example of application tha use drools, EJB, Jboss and JTA. I'm try to use drools-flow on my JEE project, and its break my project. His libraries (drools-process-task) has persitence.xml thats conflict with my persistence.xml. Help me please

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hibernate or eclipselink?

- by opensas

It seems like EclipseLink has been chosen by sun as the reference implementation of JPA 2.0, nevertheless I see lots of people continue to use hibernate... I have no experience with none of them, so I wonder which one should I choose for a new project... I'd like to know the pros / cons of each one... thanks a lot ps: btw, and this is part of the answer, there are 3636 questions on stackoverflow about hibernate, and only 68 about eclipselink...

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why i add more insignificant code but cost less time

- by user3714382

i write a method and when i add some insignificant code it works faster, like these : array[1]=array[1]; array[0]=array[0]; array[3]=array[3]; array[2]=array[2]; i use double t=System.currentTimeMillis(); at first to record the time. then call the method and use System.out.println(System.currentTimeMillis()-t); in the end. when i delete the code (array[1]=array[1];...) the cost time is 1035.0 ms,but if i add these code, the cost time become 898.0ms. here is my method and my code. PS:this method is use for the game 2048, exp: {2,2,2,2} trans to {0,0,4,4} static void toRight2(int[] array){ if (array[2]==array[3] ) { array[3]=array[2]*2; if (array[0]==array[1]) { array[2]=array[1]*2; array[0]=0; array[1]=0; }else { array[2]=array[1]; array[1]=array[0]; array[0]=0; } } else{ if (array[0]==array[1]) { array[1]=array[1]*2; array[0]=0; array[3]=array[3]; array[2]=array[2]; }else { array[1]=array[1];//delete this cost more time array[0]=array[0];//delete this cost more time array[3]=array[3];//delete this cost more time array[2]=array[2];//delete this cost more time } } } public static void main(String[] args) { double t=System.currentTimeMillis(); int[] array={1,2,3,3}; for (int j = 2; j <400*1000000; j++) { toRight2(array); } System.out.println(System.currentTimeMillis()-t); }

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use of EntityManagerFactory causing duplicate primary key exceptions

- by bradd

Hey guys, my goal is create an EntityManager using properties dependent on which database is in use. I've seen something like this done in all my Google searches(I made the code more basic for the purpose of this question): @PersistenceUnit private EntityManagerFactory emf; private EntityManager em; private Properties props; @PostConstruct public void createEntityManager(){ //if oracle set oracle properties else set postgres properties emf = Persistence.createEntityManagerFactory("app-x"); em = emf.createEntityManager(props); } This works and I can load Oracle or Postgres properties successfully and I can Select from either database. HOWEVER, I am running into issues when doing INSERT statements. Whenever an INSERT is done I get a duplicate primary key exception.. every time! Can anyone shed some light on why this may be happening? Thanks -Brad

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Changes to JBoss web.xml have no effect

- by sixtyfootersdude

I just added this to my web.xml on my JBOSS server. But it had no effect. I am still allowed to connect to ports that do not use bi-directional certificate exchange. Anyone have an ideas?  <security-constraint>  <web-resource-collection>   <web-resource-name> Entire Application </web-resource-name>  <url-pattern> /* </url-pattern> </web-resource-collection>  <user-data-constraint>          <transport-guarantee> CONFIDENTIAL </transport-guarantee> </user-data-constraint> </security-constraint> <login-config>    <auth-method> CLIENT-CERT </auth-method> </login-config> Update Actually it appears that I have made an error in my original posting. The web.xml does block users from connecting to the webservice using http (port C below). However users are still allowed to connect to ports that do not force users to authenticate themselves (port B). I think that users should be able to connect to port A (it has clientAuth="true") but I dont think that people should be able to connect to port B (it has clientAuth="false"). Excerpt from server.xml <Connector port="<A>" ... SSLEnabled="true" ... scheme="https" secure="true" clientAuth="true" keystoreFile="... .keystore" keystorePass="pword" truststoreFile="... .keystore" truststorePass="pword" sslProtocol="TLS"/> <Connector port="<B>" ... SSLEnabled="true" ... scheme="https" secure="true" clientAuth="false" keystoreFile="... .keystore" keystorePass="pword" sslProtocol = "TLS" /> <Connector port="<C>" ... />

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Blackberry stopwatch implementation

- by Michaela

I'm trying to write a blackberry app that is basically a stopwatch, and displays lap times. First, I'm not sure I'm implementing the stopwatch functionality in the most optimal way. I have a LabelField (_myLabel) that displays the 'clock' - starting at 00:00. Then you hit the start button and every second the _myLabel field gets updated with how many seconds have past since the last update (should only ever increment by 1, but sometimes there is a delay and it will skip a number). I just can't think of a different way to do it - and I am new to GUI development and threads so I guess that's why. EDIT: Here is what calls the stopwatch: _timer = new Timer(); _timer.schedule(new MyTimerTask(), 250, 250); And here is the TimerTask: class MyTimerTask extends TimerTask { long currentTime; long startTime = System.currentTimeMillis(); public void run() { synchronized (Application.getEventLock()) { currentTime = System.currentTimeMillis(); long diff = currentTime - startTime; long min = diff / 60000; long sec = (diff % 60000) / 1000; String minStr = new Long(min).toString(); String secStr = new Long(sec).toString(); if (min < 10) minStr = "0" + minStr; if (sec < 10) secStr = "0" + secStr; _myLabel.setText(minStr + ":" + secStr); timerDisplay.deleteAll(); timerDisplay.add(_timerLabel); } } } Anyway when you stop the stopwatch it updates a historical table of lap time data. When this list gets long, the timer starts to degrade. If you try to scroll, then it gets really bad. Is there a better way to implement my stopwatch?

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Class Diagram in Eclipse

- by Claus Jørgensen

Hi Is there a Visual Studio like plugin for Eclipse that will allow me create a class-diagram ? Preferable something that is actually up to date. Most of what Google finds is dead projects who haven't been updated in 2-6 years.

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Deletes not cascading for self-referencing entities

- by jwaddell

I have the following (simplified) Hibernate entities: @Entity @Table(name = "package") public class Package { protected Content content; @OneToOne(cascade = {javax.persistence.CascadeType.ALL}) @JoinColumn(name = "content_id") @Fetch(value = FetchMode.JOIN) public Content getContent() { return content; } public void setContent(Content content) { this.content = content; } } @Entity @Table(name = "content") public class Content { private Set<Content> subContents = new HashSet<Content>(); private ArchivalInformationPackage parentPackage; @OneToMany(fetch = FetchType.EAGER) @JoinTable(name = "subcontents", joinColumns = {@JoinColumn(name = "content_id")}, inverseJoinColumns = {@JoinColumn(name = "elt")}) @Cascade(value = {org.hibernate.annotations.CascadeType.DELETE, org.hibernate.annotations.CascadeType.REPLICATE}) @Fetch(value = FetchMode.SUBSELECT) public Set<Content> getSubContents() { return subContents; } public void setSubContents(Set<Content> subContents) { this.subContents = subContents; } @ManyToOne(cascade = {CascadeType.ALL}) @JoinColumn(name = "parent_package_id") public Package getParentPackage() { return parentPackage; } public void setParentPackage(Package parentPackage) { this.parentPackage = parentPackage; } } So there is one Package, which has one "top" Content. The top Content links back to the Package, with cascade set to ALL. The top Content may have many "sub" Contents, and each sub-Content may have many sub-Contents of its own. Each sub-Content has a parent Package, which may or may not be the same Package as the top Content (ie a many-to-one relationship for Content to Package). The relationships are required to be ManyToOne (Package to Content) and ManyToMany (Content to sub-Contents) but for the case I am currently testing each sub-Content only relates to one Package or Content. The problem is that when I delete a Package and flush the session, I get a Hibernate error stating that I'm violating a foreign key constraint on table subcontents, with a particular content_id still referenced from table subcontents. I've tried specifically (recursively) deleting the Contents before deleting the Package but I get the same error. Is there a reason why this entity tree is not being deleted properly? EDIT: After reading answers/comments I realised that a Content cannot have multiple Packages, and a sub-Content cannot have multiple parent-Contents, so I have modified the annotations from ManyToOne and ManyToMany to OneToOne and OneToMany. Unfortunately that did not fix the problem. I have also added the bi-directional link from Content back to the parent Package which I left out of the simplified code.

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How to set up hibernate to use Glassfish connection pool?

- by jschoen

I have set up a connection pool in Glassfish with a jndi resource for it also setup. I am stumped on how to configure hibernate to go get it. I have come across alot of write ups to configure it to use C3P0 connection pool. Well I am lost. I found that I need to set: hibernate.connection.datasource hibernate.jndi.url hibernate.jndi.class hibernate.connection.username hibernate.connection.password Would datasource be the same as the hibernate.connection.datasource set in the connection pool? What would hibernate.jndi.class be? Are hibernate.connection.username and hibernate.connection.password for the connection to the database or to the appserver? I assume this is to the database, but why do I need them since that is all set in the appserver?

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Android: Changing LinearLayout in a widget.

- by Profete162

Hello all, I have this really annoying problem: In my widget, i would like to change the background by code. I noticed on the Google doc than I can easily change the background of an Imageview: remoteViews.setImageViewResource(R.id.my_iv, R.drawable.my_bg); Ok, too easy, i want to change now the Linear layout.. What I read about the remoteview id that I can change a Bitmap, Int, Bool, String, etc... but not a drawable. So i guess i cannot use: remoteViews.setBitmap(R.id.my_ll,"setBackgroundDrawable",BitmapFactory.decodeResource(context.getResources(), R.drawablemy_bg)); I am totally disapointed and tried a last idea: views.setInt(R.id.my_ll,"setBackgroundResource",R.drawable.my_bg); But The logcat told me: android.widget.RemoteViews$ActionException:view: android.widget.LinearLayout can't use method with RemoteViews: setBackgroundResource(int) I am totally lost and I really don't know what to do... I would really appreciate any help. Thank a lot!

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how to configure hibernate 3.3 in eclipse galileo?

- by Uvi

i am working on galileo but i am not able to find the plugin for hibernate 3.3 can anybody send me the plugin link please. it's urgent. and also send me the spring 2.x latest version plugin also. Thanks in advance, Bhuvan Yadav.

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Can't get SplitLayoutPanel working - GWT + UIBinder are driving me crazy

- by Matt H

... <g:VerticalPanel styleName="{style.mainVerticalPanel}"> <g:SplitLayoutPanel> <g:north size="700"> <g:VerticalPanel> <g:ScrollPanel styleName="{style.conversationPanelContainer}"> <g:FlexTable ui:field="conversationPanel" styleName="{style.conversationPanel}"></g:FlexTable> </g:ScrollPanel> <g:HorizontalPanel styleName="{style.messageTextAndSendPanel}"> <g:TextBox ui:field="messageText" styleName="{style.messageText}"></g:TextBox><g:Button ui:field="sendButton">Send</g:Button> </g:HorizontalPanel> </g:VerticalPanel> </g:north> <g:south size="300"> <g:button>TestButton</g:button> </g:south> </g:SplitLayoutPanel> </g:VerticalPanel> ... Anything look wrong with this? All I'm trying to do is make a simple split panel but whenever I run this all I get is a blank page. Without any of the SplitPanel stuff, it works fine. The same happens with DockLayoutPanel.

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How to schedule multiple jobs in quartz scheduler using same trigger?

- by aquero

Hi, I am using quartz scheduler in my spring project. I have to run a job after another job which is scheduled to run in every 15 mins? I cant run this job concurrently as both of this jobs have to access same mail account using different protocols(one to send:smtp and other to receive: imap) and it may cause problems. Please reply quickly, as its an urgent requirement.

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Netbeans not Deploying/Debugging

- by Triztian

Hello all, I have this problem, it's the second time it happens to me, I'm using the NB IDE 6.9.1 and after a while I was working fine, but then It stopped deploying my webapp when debugging or running the application, I don't recall messing with the ant build scripts or any strange configurations, it successfully builds the dist folder and *.war file and I am able to deploy it manually, but when I run it through the IDE it deletes the webapp folder webapps/myapp,so I cannot debug it or run it, all I get is ClassNotFoundException for my servlets. I am unsure of what extra information would help to solve this issue Its pretty annoying, I don't know how it got solved the last time, it just "went away" any help is truly appreciated.

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How can you access the packet information in a JpCap Packet

- by mvid

How can I pull relevant packet information from a JpCap packet? I am trying to find the source/destination ip and port. So far I have tried string parsing the Packet's toString() method, but that seems brutish.

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JDBC Null pointer Exception thrown

- by harigm

Hi I'm getting nullpointerexception at rs.next() or rs.getString(1) it is really weird that sometimes rs.next() works fine and it throws nullpointerexception at rs.getString("PRODUCTCODE"),sometimes it throws npe at rs.getString("PRODDATE") i dont understand why rs.getString() thows npe while rs.next() works fine Here is my code { ResultSet rs = null; String query = ""; BarcodeBean bi = null; try { query = "SELECT * FROM TABLE(GET_BARCODEINFO('"barcode.trim()"'))"; statement = connection.createStatement(); Logger.getInstance().getLogger().logInfo(query); rs = statement.executeQuery(query); bi = new BarcodeBean(); if (rs == null){ if(rs.next()){ bi.setUrunKodu(rs.getString("PRODUCTCODE")); bi.setImalatMakineKodu(rs.getString("PRODMACHINECODE")); bi.setOperatorSicilNo(rs.getString("OPERATORID")); bi.setImalatTarihi(rs.getString("PRODDATE")); bi.setImalatVardiyasi(rs.getString("PRODSHIFT")); bi.setSeriNumarasi(rs.getString("SERIALNUMBER")); bi.setSirtTarihi(rs.getString("SIRTTARIHI")); } } } catch (SQLException e) { e.printStackTrace(); throw e; } catch (Exception e) { e.printStackTrace(); } finally { DatabaseUtility.close(rs); DatabaseUtility.close(statement); } }

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tapestry 4 form submitted get by id

- by cometta

my has custom element like below that created using custom ajax <select jwcid="testtest <at> Any"> <option value="x">California -- CA</option> <option value="y">Colorado -- CO</option> <option value="z">Connecticut -- CN</option> </select> after the use this cycle.getPage().getComponents().get("testtest") ?

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Struts2 Populating Checkbox from Arraylist of Objects

- by user2972139

I'm sure that I'm doing something dumb but I've been going craze over the last couple of days trying to get my checkboxes filled out inside an iterator that goes over an arraylist of object. Here is my object: public class EmailObject { int emailId; String emailAddress; public int getEmailId() { return emailId; } public void setEmailId(int emailId) { this.emailId = emailId; } public String getEmailAddress() { return emailAddress; } public void setEmailAddress(String emailAddress) { this.emailAddress = emailAddress; } } In my action class, I create an arraylist of the above EmailObjects. On my jsp page, I can get checkboxes through a checkboxlist (but this isn't good for me because I want it to be vertical and don't want to mess with the struts styles) <s:checkboxlist name="selectedEmails" list="userEmails" listValue="emailAddress" listKey="emailId" /> I can also iterate over the arraylist userEmails and display the values: <s:iterator value="userEmails" var="thisEmailData"> <s:property value="emailId"/> <s:property value="emailAddress"/> </s:iterator> But I can't get it to display the emailId when iterating over the arraylist userEmails. I tried all of these: <s:iterator value="userEmails" var="thisEmailData"> <tr><td><s:property value="emailId"/></td></tr> <tr><td> <s:checkbox fieldValue="%{#emailId}" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="#emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="thisEmailData.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="userEmails.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="#thisEmailData.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="#userEmails.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="%{#thisEmailData.emailId}" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="%{#userEmails.emailId}" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox fieldValue="emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="%{#emailId}" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="#emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="thisEmailData.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="userEmails.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="#thisEmailData.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="#userEmails.emailId" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="%{#thisEmailData.emailId}" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="%{#userEmails.emailId}" name="emailAddressesCB" theme="simple" ></s:checkbox> <s:checkbox value="emailId" name="emailAddressesCB" theme="simple" > </s:checkbox> <s:property value="emailAddress"/> </td></tr> </s:iterator> </td></tr> </s:iterator> From the above, the value field is never filled with the value of the emailId. I know I'm missing something basic. What is it? THANK YOU.

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