IT Feast

ERROR : DefaultDispatcherErrorHandler Exception occurred during processing request: failed to lazily initialize a collection of role,could not initialize proxy - no Session

2020-04-19T06:36:00.002-07:00

ERROR : DefaultDispatcherErrorHandler Exception occurred during processing request: failed to lazily initialize a collection of role: com.javaimplant.socialnetwork.model.User.friend, could not initialize proxy - no Session
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.javaimplant.socialnetwork.model.User.friend, could not initialize proxy - no Session

I got this error while trying to map a One to Many relation in my Hibernate Entity.
The issue can be resolved by adding the following fetch property above our Entity Property.

 @OneToMany(fetch = FetchType.EAGER)  
      private Set<User> friend;

Autowire same bean using different Scopes in Class

2020-01-09T03:44:00.001-08:00

Definitions in Application Context

      <bean id="RequestHit" class="com.springimplant.mvc.HitCounter" scope="request">  
           <aop:scoped-proxy/>  
      </bean>  
      <bean id="applicationHit" class="com.springimplant.mvc.HitCounter" scope="application">  
           <aop:scoped-proxy/>  
      </bean>  
      <bean id="sessionHit" class="com.springimplant.mvc.HitCounter" scope="session">  
           <aop:scoped-proxy/>  
      </bean>  
      <mvc:interceptors>  
           <mvc:interceptor>  
                <mvc:mapping path="/project/**"/>  
                <bean class="com.springimplant.mvc.interceptors.GlobalInterceptor"></bean>  
           </mvc:interceptor>  
      </mvc:interceptors>

Defination in Class

 package com.springimplant.mvc.interceptors;  
 import java.util.Date;  
 import javax.annotation.Resource;  
 import javax.servlet.http.HttpServletRequest;  
 import javax.servlet.http.HttpServletResponse;  
 import org.springframework.beans.factory.annotation.Autowired;  
 import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;  
 import com.springimplant.mvc.HitCounter;  
 public class GlobalInterceptor extends HandlerInterceptorAdapter {  
      @Resource   
      private HitCounter RequestHit;  
      @Resource  
      private HitCounter applicationHit;  
      @Resource  
      private HitCounter sessionHit;  
      @Override  
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)  
                throws Exception {  
           RequestHit.setHits(RequestHit.getHits()+1);  
           System.out.println("Request Hits "+RequestHit.getHits());  
           applicationHit.setHits(applicationHit.getHits()+1);  
           System.out.println("Application Hits "+applicationHit.getHits());  
           sessionHit.setHits(sessionHit.getHits()+1);  
           System.out.println("Session Hits "+sessionHit.getHits());  
           request.setAttribute("currentDate",new Date());  
           return super.preHandle(request, response, handler);  
      }  
 }

Autocomplete not working in spring bean configuration file

2020-01-08T21:48:00.000-08:00

Project Properties > Spring > Bean Support > Config Sets > Add New Group (contains all configuration files). Then open applicationContext.xml again.

Guard access to outside world against your MySql Port

2019-08-05T10:54:00.000-07:00

To Guard access to your Mysql Port from outside world just add following line to your my.ini file

bind-address=127.0.0.1

The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path

2019-08-01T08:12:00.003-07:00

The library referred to is bundled into an OS specific dll (tcnative-1.dll) loaded via JNI. It allows tomcat to use OS functionalities not provided in the Java Runtime (such as sendfile, epoll, OpenSSL, system status, etc.). Tomcat will run just fine without it, but for some use cases, it will be faster with the native libraries.

We can download the tcnative-1.dll (or libtcnative.so for Linux) and put it in the bin folder, and add a system property to the launch configuration of the tomcat server in eclipse.

Load mnist dataset from a local file in jupyter

2019-02-14T21:16:00.001-08:00

Recently while trying AI coding behind a proxy I was unable to load data from minist dataset from cloud.
So I manually downloaded the file "mnist.npz" kept it in {username}/.keras/datasets/ on my local machine and used the following command to load it

(X_train,y_train),(X_test,y_test)=mnist.load_data(path='mnist.npz');

And this block executed without any errors.

org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER will not be exported

2019-02-04T09:51:00.000-08:00

I had the same issue after updating my JDK in project and resolved it by replacing my .classpath file with previous one. I noticed the following changes in my .classpath file

    
         name="maven.pomderived" value="true"/>
         name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>

The second line was missing from above code

 kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>

This line was missing

     kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
    
         name="owner.project.facets" value="java"/>

These lines were added so I manually removed them and it all worked again.

The import javax.servlet cannot be resolved

2018-11-12T20:54:00.001-08:00

This issue comes up when you change/upgrade the server currently running the application.
The fix is in your Java Build Path make sure the server runtime library is compatible with the server you are running your application on.

Release port under use in windows

2018-06-16T21:27:00.003-07:00

We will release port 8080 here which is being used by windows

The Error:

The Solution:

Let's first run the following commands in order

netstat -a -o -n: This will provide us the process id of the process which is using the port.We find that process 4516 is using our port 8080 and we need to kill it.

2. Next run the command taskkill /F /PID 4516 : This will kill the process.Make sure you have opened command prompt in administrative mode.

VMware Workstation unrecoverable error: (vcpu-0)

2017-04-19T11:38:00.000-07:00

Trying to run OS X on a Virtual Machine and banging into following error.

VMware Workstation unrecoverable error: (vcpu-0)

vcpu-0:VERIFY vmcore/vmm/main/physMem_monitor.c:1180

A log file is available in "E:\temp\os x\vmware.log".

You can request support.

To collect data to submit to VMware support, choose "Collect Support Data" from the Help menu.

You can also run the "vm-support" script in the Workstation folder directly.

We will respond on the basis of your support entitlement.

Just add the following at the end of VMX file(configuration file)

smc.version = "0"

Angular Js- Using minified version of Controller,filter js files

2016-09-30T08:51:00.000-07:00

Using minifed version of controller JS Files

Here we will use a controller as an example same can be used for Filters

One important thing to note when we isolate controller from our HTML file is during its minification.

The minification also minifies variable in controller and $scope,$http,$filter may become variables a,b,c which are not recognized by angular see the minified version of above controller.js is as follows

controller.js

 angular.module('myApp',[]).controller('myCtrl',function($scope){  
 $scope.names=[  
 {name:'Gaurav',country:'India'},  
 {name:'Mike',country:'USA'},  
 {name:'Steve',country:'Denmark'}  
 ];  
 });

controller.min.js

 angular.module("myApp",[]).controller("myCtrl",function(n){n.names=[{name:"Gaurav",country:"India"},{name:"Mike",country:"USA"},{name:"Steve",country:"Denmark"}]});

Here $scope becomes n and this will not be recognized by angular js.To over come this problem use code controller code in controller.js as

controller.js

 angular.module('myApp',[]).controller('myCtrl',["$scope",myCtrl]);  
 function myCtrl($scope){  
 $scope.names=[  
 {name:'Gaurav',country:'India'},  
 {name:'Mike',country:'USA'},  
 {name:'Steve',country:'Denmark'}  
 ];  
 };

In this we isolate the Controller function but we also tell the module that the first parameter of this function will be "$scope"

The Minified version of this file is

controller.min.js

 function myCtrl(n){n.names=[{name:"Gaurav",country:"India"},{name:"Mike",country:"USA"},{name:"Steve",country:"Denmark"}]}angular.module("myApp",[]).controller("myCtrl",["$scope",myCtrl]);

Above file also changes the parameter $scope of the function to "n" but when final call is made to function the first parameter is sent as $scope

open cart 2.3 change Theme

2016-09-26T00:07:00.000-07:00

To change in open cart 2.3

1. Go to Admin=>Extensions(main menu)=>Extensions(sub menu)

2. Select Themes as Extension Type

3. Click on Edit Action in Your store(blue button in above image) and select your theme directory

That's it

Angular Js- Use a filter in expression with javascript addition operator

2016-09-24T12:22:00.000-07:00

Recently in one of my Projects I was stuck up in an issue regarding filters

Here is My Custom Filter

       app.filter('alterCap',function()   
       {  
         return function(x)   
         {  
           var i, c, txt = "";  
           for (i = 0; i < x.length; i++) {  
             c = x[i];  
             if (i % 2 == 0) {  
               c = c.toUpperCase();  
             }  
             txt += c;  
           }  
           return txt;  
         };  
       });

I am trying to use this filter in my HTML as

 {{ x.country|alterCap + ":" + x.capital|alterCap }}

But this didn't worked out so I had to use filter in my controller.Here is how I did the same

 app.controller("myCtrl",function($scope,$filter){  
         $scope.capitals = [  
         {country:'India',capital:'Delhi'},  
         {country:'Sri Lanka',capital:'Colombo'},  
         {country:'Afganistan',capital:'Kabul'},  
         {country:'Bhutan',capital:'Norway'},  
         {country:'Nepal',capital:'Thimphu'},  
         {country:'Japan',capital:'Tokyo'},  
         {country:'China',capital:'Beijing'},  
         {country:'Russia',capital:'Moscow'},  
         {country:'USA',capital:'Washington, D.C.'}  
         ];  
         $scope.applyAlterCap = function(movie){  
           return $filter('alterCap')(movie);  
         };  
       });

And then I used this in my Html as follows

 <p>Using Custom Filter with addition operator inside expression</p>  
     <ul>  
       <li ng-repeat="x in capitals | orderBy:'capital'">  
         {{ applyAlterCap(x.country) + ":" + x.capital }}  
       </li>  
     </ul>

Ubuntu boots into command line after update

2016-09-20T21:38:00.000-07:00

I recently faced this issue after updating to Ubuntu 15.10 and was looking for solutions until this one worked for me

Enter into recovery mode from grub and run the following command

sudo dpkg --configure -a

Symfony-Error-Annotation not Imported

2016-01-04T22:16:00.000-08:00

[Semantical Error] The annotation "@Template" in method AppBundle\Controller\DefaultController::indexAction() was never imported. Did you maybe forget to add a "use" statement for this annotation? in /var/www/symfony_learn_2_6/src/AppBundle/Controller/ (which is being imported from "/var/www/symfony_learn_2_6/app/config/routing.yml").

Recently while working on symfony I encountered above error.The resolution is simple we just need to add Sensio annotation handler for the above annotation.So in this case since annotation handler for template is missing we need to add

Sensio\Bundle\FrameworkExtraBundle\Configuration\Template

above the controller.Similerly if annotation handler for route is missing then we can add

Sensio\Bundle\FrameworkExtraBundle\Configuration\Route

Symfony-Generate Bundle Option not working in app/console

2015-12-27T21:34:00.002-08:00

Recently in One of the symfony dumps I gathered from my IT team had an issue due to some reason "Generate Bundle" option was not working from app/console list -- raw

Solution :

Add following lines in File composer.json

"required-dev":{
"sensio/generator-bundle": "~2.3"
}

File AppKernal.php should have

new Sensio\Bundle\GeneratorBundle\SensioGenerator();

That's it

Cakephp 2.0-Validations not working

2015-07-30T10:18:00.000-07:00

Many a times Our custom Validations do not work in cakephp due to very tiny small errors.Here is a piece of my research and development which might help you
In the controller

       if (!empty($this->data))   
       {  
         $this->User->set($this->data);  
         if ($this->User->validates())   
         {  
           // it validated logic  
           echo "Yes we can proceed";  
         }   
         else   
         {  
           // didn't validate logic  
           $errors = $this->User->validationErrors;  
           pr($errors);  
         }  
       }

See the line in Bold this must be done to get errors set

In the view

   <?php   
       if($this->Form->isFieldError('User.username'))  
       {  
         echo $this->Form->error('User.username', null, array('class' => 'message'));   
       }  
       ?>

Now set the class to taste and you will get error message in view in desired color.

Cakephp 2.0-Adding favicon to your website

2015-07-09T11:08:00.000-07:00

I was able to add a favicon to my website using code mentioned.This one is trusted and working.

 echo $this->Html->meta('favicon.ico','img/favicon.ico',array('type' => 'icon'));

You need to place your favicon.ico file in/webroot/img directory

Cakephp 3.0-Where IN Condition with list

2015-04-05T11:35:00.002-07:00

So here comes Cakephp 3.0 with all new syntax new ORM and many other changes.I find myself struggling with Cakephp this hard since I used cakephp 1.3 for the first time.

But here is My first struggle to help you with

  return $this->find('list',['keyField' => 'id', 'valueField' => 'name'])->where([  
          'id IN'=>$nearCitys  
       ])->toArray();

Cakephp 3.0-Installing from Composer

2015-04-04T10:59:00.001-07:00

Recently I was trying to install cakephp 3.0 from composer which was throwing some cache errors as such my install was unsuccessfull

Here is what I did to correct the same

When you run composer to install something let us suppose cakephp 3.0 it creates a cache in your home directory.In my case location was

/home/gaurav/.composer

This location has a cache folder which works for composer installation.This is not writable by default so this should b provided write permissions also Cakephp 3.0 requires

mbstring extension
intl extension

which must be installed in advanced(google it to get concerned installation repository for your distribution)

After that my Install went smooth.

Apache2-Forbidden You don't have permission to access /dir/ on this server

2015-04-04T10:44:00.002-07:00

Recently on restarting my Apache Server on Ubuntu I came across following error

Forbidden You don't have permission to access /dir/ on this server

After a bit of google I solved this by granting permissions to my server directory and resetting my httpd.conf directory access levels as follows

Since I am working on Ubuntu I will be using Ubuntu locations your locations can very depending upon your linux distribution

In Ubuntu httpd.conf file is place under
/etc/apache2/sites-available directory

if you list directory contents you will find files like

000-default.conf 000-default.old example.com~
000-default.conf~ default-ssl.conf

Out of these first one is the httpd.conf file in concern(this is how Ubuntu stores it)

First make a copy of the same as you can see I have made a copy of the same 000-default.old using following command

sudo cp 000-default.conf 000-default.old

Now Alter the 000-default.conf as follows

 <VirtualHost *:80>  
   ServerAdmin webmaster@localhost  
   DocumentRoot /var/www  
   <Directory />  
     Options FollowSymLinks  
     AllowOverride None  
   </Directory>  
   <Directory /var/www>  
     Options Indexes FollowSymLinks MultiViews  
     AllowOverride All  
     Order allow,deny  
     allow from all  
   </Directory>  
   ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/  
   <Directory "/usr/lib/cgi-bin">  
     AllowOverride None  
     Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch  
     Order allow,deny  
     Allow from all  
   </Directory>  
   ErrorLog ${APACHE_LOG_DIR}/error.log  
   # Possible values include: debug, info, notice, warn, error, crit,  
   # alert, emerg.  
   LogLevel warn  
   CustomLog ${APACHE_LOG_DIR}/access.log combined  
 </VirtualHost>

Next grant permissions to your directory as

sudo chown -R $USER:$USER /var/www
sudo chmod -R g+rw /var/www

You will now be able to access your localhost directory

Configuring External Apache Tomcat in Netbeans/Ubuntu or error : specify the server location (Catalina Home)) and error : could not read server-config.xml

2015-03-25T11:46:00.000-07:00

Hi This posts counters the problem of configuration of external Apache Tomcat Server to Ubuntu..

It also deals with the errors
1. specify the server location (Catalina Home))
2. could not read server-config.xml

To Counter all this we need to do as follows

For First Problem create and link directories as follows.This will only occur if Netbeans thinks if you are using and older version of Tomcat Server.

cd /usr/share/tomcat7
sudo mkdir common
cd common
sudo ln -s ../lib lib

For Second Problem create and link directories as follows

cd /usr/share/tomcat7
sudo mkdir conf 
cd conf
sudo ln -s /etc/tomcat7/server.xml server.xml
sudo chmod o+rx /usr/share/tomcat7/conf

Thats it give a username and Password and Apache server is configured on your Netbeans

Wordpress-Error:Allowed memory size of 41943040 bytes exhausted

2014-12-13T09:51:00.002-08:00

This means that the maximum allowed memory of about 40M has been used and needs to be increased.
As such we write the following command into wp-config.php in order to increase allowed memory.

In below example we are setting threshold to 64MB

('WP_MEMORY_LIMIT', '64M');

Wordpress-Bypass FTP credientials step for updates(Update on localhost)

2014-12-13T05:57:00.000-08:00

If you want to bypass the step where wordpress asks for ftp credentials on update i.e you do not want wordpress to ask for ftp credentials on update specially helpful in updating on localhost

Then in wp-config.php add the following lines to the code

define('FS_METHOD','direct');

That's it and this will bypass the ask for ftp credientials

Ubuntu-Connect an Android device using MTP in Ubuntu 14.04 LTS

2014-11-14T06:29:00.000-08:00

After Much of Fiddle I was able to connect my ASUS Zenfhone 5 to my ubuntu via MTP Here is How..

1. First we need to install some MTP Apps so run the following command

 sudo apt-get install libmtp-common mtp-tools libmtp-dev libmtp-runtime libmtp9

Then run

 sudo apt-get dist-upgrade

2. Then we're going to amend the fuse.conf file. FUSE is an application that aims to provide a secure method for non privileged users to create and mount their own file system implementations.

Run the following command

 sudo nano /etc/fuse.conf

You will get following lines remove # before last line which allows other users to mount their own file systems

 # /etc/fuse.conf - Configuration file for Filesystem in Userspace (FUSE)  
 # Set the maximum number of FUSE mounts allowed to non-root users.  
 # The default is 1000.  
 #mount_max = 1000  
 # Allow non-root users to specify the allow_other or allow_root mount options.  
 user_allow_other

3. Now connect your device using MTP option and run following command

 lsusb

You will get a list as follows

 Bus 002 Device 007: ID 413c:8160 Dell Computer Corp. Wireless 365 Bluetooth  
 Bus 002 Device 005: ID 413c:8162 Dell Computer Corp. Integrated Touchpad [Synaptics]  
 Bus 002 Device 004: ID 413c:8161 Dell Computer Corp. Integrated Keyboard  
 Bus 002 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)  
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub  
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  
 Bus 001 Device 006: ID 0b05:5480 ASUSTek Computer, Inc.   
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub  
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I find the only device connected to my system of name ASUSTek Computer is my ASUS mobile we need two parts from above line

0b05:5480

Make a note of these and now we will add these to another rules file

4. Run following command

sudo nano /lib/udev/rules.d/69-mtp.rules

Now add the following lines to the file see the idProduct and idVendor we have added change it in accordance with your device

# ASUSTek Computer, Inc.
ATTR{idVendor}=="0b05", ATTR{idProduct}=="5480", SYMLINK+="libmtp-%k", ENV{ID_MTP_DEVICE}="1", ENV{ID_MEDIA_PLAYER}="1"

5. Now we need to add this information to another rules file

sudo nano /etc/udev/rules.d/51-android.rules

Now add the following lines to the open file

 ATTR{idVendor}=="0b05", ATTR{idProduct}=="5480", MODE=”0666"

Remember to add correct idVendor and idProduct

6. Restart the service

 sudo service udev restart

7. Reboot Device

 sudo reboot

That's It