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  • La gamme Exalogic d'Oracle s'enrichit et offre des performances extrêmes pour les applications Java

    La gamme Exalogic d'Oracle s'enrichit Et offre un choix encore plus étendu de solutions de consolidation et des performances extrêmes pour les applications Java Dans la foulée de la présentation de ses tous nouveaux serveurs SPARC Supercluster T3, http://www.developpez.com/actu/24664...s-de-plus-IBM/ Oracle vient d'annonce Oracle Exalogic Elastic Cloud T3-1B, un nouveau modèle qui permet aux systèmes intégrés Oracle Exalogic Elastic Cloud de bénéficier des caractéristiques des serveurs SPARC Solaris en matière de performance, d'évoluti...

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  • Oracle Java Products Updates (2013/10/30)

    - by Hiro
    Oracle Java Products Media Pack ?????2013/10/30 ???????????????? Oracle JRE/JDK 7 Update 45 ???????????????????? ???????????????Apple Mac OS X (Intel) (64-bit), Linux x86, Linux x86-64, Microsoft Windows (32-bit), Microsoft Windows x64, Oracle Solaris on SPARC (32-bit), Oracle Solaris on SPARC (64-bit), Oracle Solaris on x86 (32-bit), Oracle Solaris on x86-64 (64-bit) ??? ?????

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  • How to Integrate Facebook and Twitter with Java Applications

    Exposure on social media sites such as Facebook, Twitter and LinkedIn has a tremendous impact on business, effecting marketing, networking, analytics and more. Social media is a natural resource for collecting user feedback, comments, suggestions, etc., making the integration of social media with applications increasingly important. This article will discuss the integration of Facebook and Twitter with a Java application.

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  • Java Swing Headaches [on hold]

    - by user107211
    have been using java for quite sometime now(about 4 months). Things seemed to be going smootly till I started learning swing, and am not finding it funny at all, its tideous, unstable(especially layout). I just wanted to know how important it is for programmer to master swing, is it really that important. Is that all there is to desktop applications, because that where I would love to concentrate on. THNKS iN ADvance FoR your COmments

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  • JPA : optimize EJB-QL query involving large many-to-many join table

    - by Fabien
    Hi all. I'm using Hibernate Entity Manager 3.4.0.GA with Spring 2.5.6 and MySql 5.1. I have a use case where an entity called Artifact has a reflexive many-to-many relation with itself, and the join table is quite large (1 million lines). As a result, the HQL query performed by one of the methods in my DAO takes a long time. Any advice on how to optimize this and still use HQL ? Or do I have no choice but to switch to a native SQL query that would perform a join between the table ARTIFACT and the join table ARTIFACT_DEPENDENCIES ? Here is the problematic query performed in the DAO : @SuppressWarnings("unchecked") public List<Artifact> findDependentArtifacts(Artifact artifact) { Query query = em.createQuery("select a from Artifact a where :artifact in elements(a.dependencies)"); query.setParameter("artifact", artifact); List<Artifact> list = query.getResultList(); return list; } And the code for the Artifact entity : package com.acme.dependencytool.persistence.model; import java.util.ArrayList; import java.util.List; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; import javax.persistence.Table; import javax.persistence.UniqueConstraint; @Entity @Table(name = "ARTIFACT", uniqueConstraints={@UniqueConstraint(columnNames={"GROUP_ID", "ARTIFACT_ID", "VERSION"})}) public class Artifact { @Id @GeneratedValue @Column(name = "ID") private Long id = null; @Column(name = "GROUP_ID", length = 255, nullable = false) private String groupId; @Column(name = "ARTIFACT_ID", length = 255, nullable = false) private String artifactId; @Column(name = "VERSION", length = 255, nullable = false) private String version; @ManyToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER) @JoinTable( name="ARTIFACT_DEPENDENCIES", joinColumns = @JoinColumn(name="ARTIFACT_ID", referencedColumnName="ID"), inverseJoinColumns = @JoinColumn(name="DEPENDENCY_ID", referencedColumnName="ID") ) private List<Artifact> dependencies = new ArrayList<Artifact>(); public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getGroupId() { return groupId; } public void setGroupId(String groupId) { this.groupId = groupId; } public String getArtifactId() { return artifactId; } public void setArtifactId(String artifactId) { this.artifactId = artifactId; } public String getVersion() { return version; } public void setVersion(String version) { this.version = version; } public List<Artifact> getDependencies() { return dependencies; } public void setDependencies(List<Artifact> dependencies) { this.dependencies = dependencies; } } Thanks in advance. EDIT 1 : The DDLs are generated automatically by Hibernate EntityMananger based on the JPA annotations in the Artifact entity. I have no explicit control on the automaticaly-generated join table, and the JPA annotations don't let me explicitly set an index on a column of a table that does not correspond to an actual Entity (in the JPA sense). So I guess the indexing of table ARTIFACT_DEPENDENCIES is left to the DB, MySQL in my case, which apparently uses a composite index based on both clumns but doesn't index the column that is most relevant in my query (DEPENDENCY_ID). mysql describe ARTIFACT_DEPENDENCIES; +---------------+------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------------+------------+------+-----+---------+-------+ | ARTIFACT_ID | bigint(20) | NO | MUL | NULL | | | DEPENDENCY_ID | bigint(20) | NO | MUL | NULL | | +---------------+------------+------+-----+---------+-------+ EDIT 2 : When turning on showSql in the Hibernate session, I see many occurences of the same type of SQL query, as below : select dependenci0_.ARTIFACT_ID as ARTIFACT1_1_, dependenci0_.DEPENDENCY_ID as DEPENDENCY2_1_, artifact1_.ID as ID1_0_, artifact1_.ARTIFACT_ID as ARTIFACT2_1_0_, artifact1_.GROUP_ID as GROUP3_1_0_, artifact1_.VERSION as VERSION1_0_ from ARTIFACT_DEPENDENCIES dependenci0_ left outer join ARTIFACT artifact1_ on dependenci0_.DEPENDENCY_ID=artifact1_.ID where dependenci0_.ARTIFACT_ID=? Here's what EXPLAIN in MySql says about this type of query : mysql explain select dependenci0_.ARTIFACT_ID as ARTIFACT1_1_, dependenci0_.DEPENDENCY_ID as DEPENDENCY2_1_, artifact1_.ID as ID1_0_, artifact1_.ARTIFACT_ID as ARTIFACT2_1_0_, artifact1_.GROUP_ID as GROUP3_1_0_, artifact1_.VERSION as VERSION1_0_ from ARTIFACT_DEPENDENCIES dependenci0_ left outer join ARTIFACT artifact1_ on dependenci0_.DEPENDENCY_ID=artifact1_.ID where dependenci0_.ARTIFACT_ID=1; +----+-------------+--------------+--------+-------------------+-------------------+---------+---------------------------------------------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+--------------+--------+-------------------+-------------------+---------+---------------------------------------------+------+-------+ | 1 | SIMPLE | dependenci0_ | ref | FKEA2DE763364D466 | FKEA2DE763364D466 | 8 | const | 159 | | | 1 | SIMPLE | artifact1_ | eq_ref | PRIMARY | PRIMARY | 8 | dependencytooldb.dependenci0_.DEPENDENCY_ID | 1 | | +----+-------------+--------------+--------+-------------------+-------------------+---------+---------------------------------------------+------+-------+ EDIT 3 : I tried setting the FetchType to LAZY in the JoinTable annotation, but I then get the following exception : Hibernate: select artifact0_.ID as ID1_, artifact0_.ARTIFACT_ID as ARTIFACT2_1_, artifact0_.GROUP_ID as GROUP3_1_, artifact0_.VERSION as VERSION1_ from ARTIFACT artifact0_ where artifact0_.GROUP_ID=? and artifact0_.ARTIFACT_ID=? 51545 [btpool0-2] ERROR org.hibernate.LazyInitializationException - failed to lazily initialize a collection of role: com.acme.dependencytool.persistence.model.Artifact.dependencies, no session or session was closed org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.acme.dependencytool.persistence.model.Artifact.dependencies, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:380) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:372) at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:119) at org.hibernate.collection.PersistentBag.size(PersistentBag.java:248) at com.acme.dependencytool.server.DependencyToolServiceImpl.createArtifactViewBean(DependencyToolServiceImpl.java:93) at com.acme.dependencytool.server.DependencyToolServiceImpl.createArtifactViewBean(DependencyToolServiceImpl.java:109) at com.acme.dependencytool.server.DependencyToolServiceImpl.search(DependencyToolServiceImpl.java:48) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:166) at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:324) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505) at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

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  • Configure Plesk only for Tomcat-Java

    - by AJIT RANA
    I need to configure tomcat on Linux dedicate server only for Java project through Plesk . Following services is running on it. '1.Apache on port 80 ' '2.Tomcat on port 8080/9080' '3.Mysql on port 3306 ' Now problem is this, i need to run only java project on this server from port 80 .this time user type my site name then default page call index.html or .php file from root directory of Apache. so how it can be possible to run java project from this server default port 80 after deploye .war(java project) file to this server. Because user who wants to access my site does not know its port number for Tomcat as here is 9080 and also deploy file name. Pls look below for detail about problem Suppose my sit name is www.example.com and hosted on Linux dedicate server with Plesk install on it with Apache, Tomcat and Mysql. Now for running my java project on it, i need to enter www.example.com:9080/java_projrect_name/ in browser. So how can i run this project only from URL www.example.com and it will call default file .jsp from java_project_name directory. I do not want to enter port number and java_project_name in url and my client who wants to access this project did not know about port number as well as project name . He knows only about URL as www.example.com and when he browses it then it should call default page from java_project directory. So to implement this what should we need to do? Pls help. Thanks

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  • OpenVPN performance: how many concurrent clients are possible?

    - by Steffen Müller
    I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive approach is to make the clients connect to the server via an openvpn network. This way, the secure communication tunnel can be used in both directions. This means that all clients are always connected to the server. There are many clients summing up over the years. The question is: does the OpenVPN server explode when reaching a certain number of clients? I am already aware of a maximum TCP connection number limit, therefore (and for other reasons) the VPN would have to use UDP transport. OpenVPN gurus, what is your opinion?

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  • Does NMBD depend on DHCP?

    - by Atilla Filiz
    I am trying to debug a SMB share issue on an embedded Linux setup. Before diving into source code, I want to make sure this is not a configuration problem. So here is my case: Scenario-1: dhcp server enabled by default 1- system boots 2- udhcpcd server starts 3- smb server starts (smbd) 4- nmb server starts (nmbd) 5- smb share accessible Scenario-2: dhcp server disabled by default 1- system boots 2- smbd starts 3- nmbd fails to start 4- smb share inaccessible 5- $/etc/init.d/udhcpcd start 6- $/usr/sbin/nmbd still fails without an error message The client pc and the server device have static IP addresses in both cases. Is it possible that, NMBD somehow depends on a DHCP server at start?

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  • Making evince the default application for embedding PDFs in firefox in ubuntu

    - by Seamus
    While I'm on the subject of complaining about things that upgrading to ubuntu 10.04 broke (see here), another problem that happened on moving from 9.04 to 9.10 (I think) is this: Firefox used to open embedded pdf files with evince and that was fine. Now it opens them with okular, which I don't like for several reasons. (Pg Up, Pg Dn keys don't work. I don't like the KDE save file dialogue box, because I'm used to gnome. ) So my question is: how do I change which program is used to embed PDFs in firefox in ubuntu?

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  • would unexpected power cuts harm the Linux OS?

    - by Johan Elmander
    I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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  • embed file in Excel cell

    - by Crash893
    I'm working on a simple "DB" for some people at work and I don't want to do anything fancy. the fields should be something like name , number , notes , File:resume, notes (where file:notes is the acutall embedded resume. I cant see any obvious way to do this but i thought i would ask just the same. Is there a way to take a (pdf , doc , docx , txt) and throw it into a cell so a user can click on it and it will open the file in the approate program note: this db is going to be floating around between multiple sites so linking won't work.

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  • Can unexpected power loss harm a Linux install?

    - by Johan Elmander
    I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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  • Change Read/Write permissions from command line or VB script without cacls

    - by Sam I am
    I need a way to automatically change the read/write permissions on a folder, on an Windows XP Embedded machine. The XPE image I'm using doesn't have all of the standard Windows tools, and apparently cacls is one of those tools that it doesn't have. If I simply type cacls into my command window, it tells me 'cacls' is not recognized as an internal or external command, operable program or batch file. Is there a way for me to change file/folder permissions in Windows XPE without the CACLS command, or is there a way I can download a version of cacls.exe that will run on the XPE machine?

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  • Strip X Window System from OpenRD (Fedora core 8)

    - by disown
    I just got myself an OpenRD Client embedded box with an old Fedora 8 on it. Runs like a charm, only problem is that the default install has X on it, which I would like to remove in order to free up some space. I found a similar post here on the same topic, but yum groupremove doesn't work in my case, yum grouplist returns nothing, so I presume that no groups are defined. I don't know if this is because fedora 8 didn't have any groups, or because the OpenRD build is special in some way. In any case, I would like some tips on which package(s) to remove in order to remove an as big chunk of X as possible. Thanks in advance.

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  • Suggestions for a SOHO/Home Asterisk system

    - by James
    I would like to buy a small embedded system that runs Linux and Asterisk. I would like two FXS ports ( to plug analogue phones into ) and one FXO port ( to plug in to my real line to allow access to the POTS ). I would like it to have a USB port to hold storage for voicemail. I really want it for home use so I would like it to be under £150 ( say $250 ), given that you can buy ADSL routers for around this much can any of them be made to run Linux and Asterisk? I don't want a PC as the power usage would be too high. I am looking for something like this ASDL router but open and able to run Asterisk or another open PBX. At worst I would like a box which had one FXO and two FXS and just made them completely available over IP to a full Asterisk system on a low power Atom system.

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  • Windows fails to restart on reboot

    - by daramarak
    We have many machines running windows xp embedded. The machines are configured to reboot if any problems should occur. But our problem now is that in some cases the machines seems to shut down, but never reboots again. The same machine might reboot fine in the next time we try. Does anyone have clue what the problem might be. Does anyone got some advice on how to debug this problem. Are there any logs that might contain valuable information? Recreating this problem is not done easily so elimination methods are not feasable.

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  • Linux (lsusb) not showing String Descriptors of a USB device

    - by tzippy
    I have an embedded device that when plugged to a linux host, shows up with vid and pid that are not in the usb.ids file (proprietary IDs). However I provide String Descriptors that do show up when plugged into a Windows Host. But not on a Linux Host. lsusb -v shows only iManufacturer 3 iProduct 2 iSerial 1 But on the device side, when processing the setup requests, I see that the Strings are actually requested by the Host. By Windows and also the Linux Host. The USB Device Tree Viewwer under Windows shows this output: iManufacturer : 0x01 Language 0x0409 : "My Manufacturer" iProduct : 0x02 Language 0x0409 : "MyProduct" iSerialNumber : 0x03 Language 0x0409 : "My Serial" I feel that lsusb does not show all of the information. Is there a more informative tool?

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