Tech Trek: A Software Engineer's Guide to Code and Beyond

MapperSuperClass ·         A mapped superclass has no separate table defined for it. ·         Designates a class whose mapping information is applied to the entities that inherit from it.  ·         A class designated with the  MappedSuperclass  annotation can be mapped in the same way as an entity except that the mappings will apply only to its subclasses since no table exists for the mapped superclass itself.  ·         When applied to the subclasses the inherited mappings will apply in the context of the subclass tables.  ·         Mapping information may be overridden in such subclasses by using the  AttributeOverride  and  AssociationOverride  annotations or corresponding XML elements. ·         It avoids the cod...

Overview MongoDB is a cross-platform, documented oriented database and it is not based on schema like relational database. It uses dynamic schema and stores data in JSON format. It provides high performance, high availability, and easy scalability and it works on concept of collection and document. It is an open-source software. MongoDB is mainly written in C++, JavaScript and C. Download Please refer this link to setup MongoDB on your machine. Terminology ·          Document Document is similar to row/tuples in RDBMS, it is a set of key-value pairs and having dynamic schema i.e. the documents in the same collection do not need to have the same set of fields or structure and another document may hold different types of data. ·          Collection It is the equivalent to a TABLE in RDBMS and do not enforce a schema. It exists within a single database and each document wit...

Step by Step instructions: 1.       Download MongoDB Check MongoDB msi from Official website and download Windows Server 2008 R2 64-bit and later version. 2.       Install MongoDB Double click on downloaded MSI (mongodb-win32-x86_64-2008plus-ssl-3.2.11-signed.msi) file and follow the click on next button on wizard to complete the installation. 3.       Create Default Directory MongoDB requires a data directory to store all data and its default data directory path is \data\db. On Windows, By default it will always look for above directory under C:/ structure, Goto C: directory and create /data/db, So the full path of db folder will be C:\data\db 4.       Set environment variables Set MongoDB location to system's environment variables and give path till bin folder. 5.   5.       Start MongoDB To ...

There can be a situation where you want to extract private key from your keystore but it is not a straight forward as we think as It involves two steps i.e. ·          Extracting private key from keystore in PKCS#12 format ·          Converting it to .PEM file Step1: Extracting in PKCS format keytool -v -importkeystore -srckeystore KEYSTORE_NAME -srcalias CERTIFICATE_ALIAS -destkeystore FILE_NAME.p12 -deststoretype PKCS12 Eg: keytool -v -importkeystore -srckeystore keystore.jks -srcalias  application -destkeystore privatekey.p12 -deststoretype PKCS12 Note: If you don’t know the alias name of your certificate then you can display it: keytool -list -v -keystore keystore.jks Step2: Converting it into .PEM FILE openssl pkcs12 -in privatekey.p12 -out private.pem             

Most of the variables created by the SP are controlled by you, and correspond to mapped attributes. A few are built into the SP and can't be renamed. Variable Meaning Shib-Application-ID The  applicationId  property derived for the request. Shib-Session-ID The internal session key assigned to the session associated with the request. Shib-Identity-Provider The  entityID  of the IdP that authenticated the user associated with the request. Shib-Authentication-Instant The ISO timestamp provided by the IdP indicating the time of authentication. Shib-Authentication-Method The  AuthenticationMethod  or  <AuthnContextClassRef>  value supplied by the IdP, if any. Shib-AuthnContext-Class The  AuthenticationMethod  or  <AuthnContextClassRef>  value supplied by the IdP, if any. ...

Today, I have encountered one interesting tool in Shibboleth IdP which will check the resolver, filters and also the metadata so that you can know exactly what will happen in any given situation without starting the IdP. J As a developer, I would say it’s a great tool as you don’t have to restart your IdP again and again after every changes. The name of the tool is (Attribute Authority, Command Line Interface) ACCLI which is located in the IDP_HOME/bin directory and is called aacli.sh or aacli.bat. How it works? Make sure, you have set IDP_HOME to your system environment variable. To check what all attribute it will return for userId SysAdmin and Service Provider EntityId “https://domain.waheedtechblog.com/shibboleth”) aacli.bat --configDir=C:\idp\conf\ --principal=SysAdmin --requester=https://domain1.com/Shibboleth Please check here for detail information.

Scenario: I have an Apache Server(SSL enabled) and tomcat running on my machine and there is one application (app1) hosted on tomcat which is only accessible from Apache Server. You cannot access it directly from tomcat. Now you want to access app1 using multiple domains i.e. domain1.waheedtechblog.com annd domain2.waheedtechblog.com should point to the same application which is hosted on tomcat. (I want to implement different Authentication mechanism based on different domains) Solution: The above case can be achieved using NameBased VirtualHosts and SSL. First you need to uncomment following lines form ${apache}/conf/httpd.conf file LoadModule ssl_module modules/mod_ssl.so LoadModule proxy_module modules/mod_proxy.so LoadModule proxy_ajp_module modules/mod_proxy_ajp.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule proxy_http_module modules/mod_proxy_http.so Include conf/extra/httpd-ssl.conf then goto ${apache}/conf/extra/httpd-ssl.co...