Describes some of the services provides by the Spring Framework such as Scheduling, Email, JDBCTemplate with Transaction Management.

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 What is Spring?
 What Does Spring Offer?
 Spring Services
 Task Execution and Scheduling
 Demo-Scheduling
 Email
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 Demo-Email
 Data Access With JDBC
 Demo-Data Access
 Transaction Management
 Demo-Database Transaction

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• Spring is an open source layered Java/J2EE application
framework.
• Philosophy: J2EE should be easier to use,
“Lightweight Container” concept
• Spring performs two major roles for a Java
application.

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• A Container
o Creates objects and makes them available to your
application.
 First Spring is a container that manages all or
some of the objects used by the application.
Behind the scenes Spring configures your objects
with what they need to in order to perform their
roles in the application.

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• A Framework
o Provides an infrastructure of classes that make
it easier to accomplish tasks.
 Spring is also a framework because it provides
libraries of classes that make it easier to
accomplish common tasks such as transaction
management, database integration, email, and web
applications.

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• Lightweight container and framework.
• Manages dependencies between your objects.
o Encourages use of interfaces
o Lessens “coupling” between objects
• Providing services to simplify tasks.
o Task scheduling
o Email sending
o Data access
o Database Transaction

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• Where to use scheduling?
o Generate periodic reports
o Invoke batch process
o Execute periodic application maintenance tasks
• Spring provides support for scheduling
• Quartz: Open source solution by OpenSymphony
• Trigger: SimpleTrigger, CronTrigger, etc.

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1.Using the MethodInvokingJobDetailFactoryObject
2.Using Annotations
3.Using Quartz Scheduler
4.Using Trigger (SimpleTrigger, CronTrigger)

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• The Spring Framework provides a helpful utility library for sending
email.
• The org.springframework.mail package is the root level package for
the Spring Framework’s email support.Timers: Java's built in
scheduler
• The central interface for sending emails is the MailSender
interface; a simple value object encapsulating the properties of a
simple mail such as from and to (plus many others) is the
SimpleMailMessage class.

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1.Textual Email
2.Email with attachment

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Action Spring You
Define connection parameters. X
Open the connection. X
Specify the SQL statement. X
Declare parameters and provide parameter values X
Prepare and execute the statement. X
Set up the loop to iterate through the results (if any). X
Do the work for each iteration. X
Process any exception. X
Handle transactions. X
Close the connection, statement and resultset. X

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• The JdbcTemplate class is the central class in the JDBC core
package.
• It simplifies the use of JDBC since it handles the creation and
release of resources.
• This helps to avoid common errors such as forgetting to always
close the connection.
• It executes the core JDBC workflow like statement creation and
execution, leaving application code to provide SQL and extract
results.

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• Data Integrity.
• Consistency.
• Data and Resources may be corrupted and left in an
inconsistent state.
• Important for recovering from unexpected errors in a
concurrent and distributed environment.

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• The concept of transactions can be described with
following four key properties.
 Atomicity
 Consistency
 Isolation
 Durability

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• Atomicity
o A transaction should be treated as a single unit of operation
which means either the entire sequence of operations is
successful or unsuccessful.
• Consistency
o Once all actions of a transaction have completed, the
transaction is committed. Then your data and resources will be
in a consistent state that confirms to business rules.

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• Isolation
o Because there may be many transactions processing with the same
data set at the same time, each transaction should be isolated
from others to prevent data corruption.

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• Durability
o Once a transaction has completed, the results of this
transaction have to be made permanent and cannot be erased
from the database due to system failure.(imagine if the
power to your machine was cut right in the middle of a
transaction’s commit). Usually, the result of a
transaction is written to persistent storage.

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• Brief Introduction to Spring
• Spring Services
• Scheduling (Annotations, Quartz, Trigger,
MethodInvokingJobDetailFactoryObject)
• Email (With and without an attachment)
• Data Accessing
• Database Transaction

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Demo projects can be found in GitHub
• Spring Scheduling - MethodInvokingTimerTaskFactoryBean
• Spring Scheduling – Annotation based
• Spring Scheduling – Simple, Quartz and Cron triggers
• Spring JDBC Template with Transaction Management