Google AI tutorial/crash courses

Google tutorial/crash courses for learning AI:
https://ai.google/education/#?modal_active=none

Useful Links for JEE Devlopment

1. Links on Burlap Web service creation. A very easy way for Java to Java remoting:

http://www.devx.com/java/Article/27300/0/page/1

http://www.christianschenk.org/blog/webservices-with-hessian-and-burlap/




2. J2EE application Deployment Problem:

Problem:

java.lang.IllegalStateException: Web app root system property already set to

a different value: 'webapp.root'

Resolution

http://forum.springsource.org/archive/index.php/t-32873.html

http://forum.springsource.org/archive/index.php/t-24073.html


3. Solution on Axis 2 issue on Upgrade to 1.7.4 from 1.4.1:

Configuration required:

<parameter name="disableREST" locked="false">true</parameter>
Detail explanation in below blog

http://alloutfornoloss.com/axis2-epr-issue/

4.REST API Naming convention:
https://google.github.io/styleguide/jsoncstyleguide.xml?showone=Property_Name_Format#Property_Name_Format

Printing the DBMS_OUTPUT.PUT_LINE output from oracle to System.out in Java

Often we need to debug a Oracle stored procedure which is called from Java. In that case, it is helpful to log the DBMS_OUTPUT.put_line from Java using JDBC driver.
The below link guides a way to retrieve DBMS_OUTPUT.put_line from JDBC:

https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:45027262935845

Eclipse Papyrus: An easy way to create UML diagrams

 As a software designer/architect one would always need to take the help of UML. There are many open source tools available in market to create UML diagrams.

Visual Paradigm,Star UML to name a few. But my best personal choice is Eclipse Papyrus. This tool is very easy to learn to create UML diagrams.


Check out youtube videos on how to create various UML diagrams using Eclipse Papyrus:
https://www.youtube.com/playlist?list=PLoWne5q-c9E_Q2_eAUZKPDA5K0V-O5zXs


Check out Eclipse Papyrus here


https://www.eclipse.org/papyrus/


Download Link

https://www.eclipse.org/papyrus/download.html

Useful Book Links

Books on programming:
https://github.com/EbookFoundation/free-programming-books/blob/master/free-programming-books.md
https://github.com/bjut-hz/E-Books
https://github.com/sivaprak/myBooks
https://github.com/sanigo/books
O'Reilly Free Books:
https://gist.github.com/viruscmd/5960adf1e5b5cf1e3d465dd3ad9e1aa8
https://gist.github.com/abstractart/7b969dd9004cd11e04ba0a031fa4ab6c
Togaf Books
https://github.com/pankajchopra/togaf
Blockchain Books:
https://github.com/ShubhamTatvamasi/blockchainbooks
Books on Hadoop/Big Data
https://github.com/TechBookHunter/Free-Hadoop-Books/tree/master/book

Axis 2 Directory traversal vulnerability

Axis 2 Directory traversal  security vulnerability

Recently I have encountered one security issue of Axis 2 (1.4.1) service. The attacker can navigate to the axis.xml using the link https://victim.com/axis2/services/Version?xsd=../conf/axis2.xml & can see the Axis 2 username & password. Then attacker can deploy any malicious service to hack the system.

The issue seems to happen if the Axis 2 version <1.5.3. Upgrading the existing version to 1.5.3 (at minimal, upper versions also support) solves the problem.

The root cause of the issue is below configuration in Axis 2 1.4.1 version:

<transportReceiver name="http"

                       class="org.apache.axis2.transport.http.SimpleHTTPServer">

        <parameter name="port">8080</parameter>

SimpleHTTPServer does not block any request & hence directory traversal is possible.

I have followed the below steps to upgrade the Axis 2 from 1.4.1 to 1.5.3

1.     Upgrade the Axis 2 version to 1.5.3. & update the jars

2.     Once the JARS have been upgraded, change the below ones in conf\axis2.xml

replace

<transportReceiver name="http"

                       class="org.apache.axis2.transport.http.SimpleHTTPServer">

        <parameter name="port">8080</parameter>

with below one

<transportReceiver name="http"

                       class="org.apache.axis2.transport.http.AxisServletListener">

        <parameter name="port">8080</parameter>

    </transportReceiver>

    <transportReceiver name="https"

                       class="org.apache.axis2.transport.http.AxisServletListener">

        <parameter name="port">8443</parameter>

    </transportReceiver>

3.     Comment TCPTransportSender in axis2.xml

<!--

    <transportSender name="tcp"

                     class="org.apache.axis2.transport.tcp.TCPTransportSender"/>-->