Tips and Tricks - 5

1. Ant(Another Neat Tool) installation location

eclipse/plugins/org.apache.ant_1.9.2.v201404171502

2. Using for loop in ant

Copy the ant-contrib.jar to Eclipse/plugins/org.apache.ant_1.9.2.v201404171502/lib

Add the same jar to Window-> Preferances-> Ant ->Runtime ->Ant Home Entries-> add external jars (Specify the location of ant-contrib.jar)

<project name="projectName" xmlns:ac="antlib:net.sf.antcontrib>
< target name="forLoopExample>
<a:for list="1,2,3,4" param = "val">

      <sequential>

          <echo message = "val = @{val}"/>

      </sequential>

  </ac:for>
</target>

</project>

Result:

Buildfile: build.xml

    [echo] val = 1

    [echo] val = 2

    [echo] val = 3

    [echo] val = 4

    [echo] val = 9

 BUILD SUCCESSFUL

 Total time: 2 seconds

3. Right click in eclipse is not working

Restart Eclipse with a "-clean" option

Open Command Prompt

Go to Eclipse installation location

Type

./Eclipse -clean

Open a command prompt (click Start, Run... enter "cmd"), then go to the directory where you have Eclipse installed with "cd ", and then run "eclipse -clean".

4. Hibernate tools Plugin for Eclipse Installation

For Eclipse 3.6, the URL is ” http://download.jboss.org/jbosstools/updates/stable/helios/ ”

In Eclipse IDE, menu bar, select “Help” >> “Install New Software …” , put the Eclipse update site URL.

Type “hibernate” in the filter box, to list down the necessary components for Hibernate tools. Select all the “Hibernate Tools” components and click next to download.

After the download progress is completed, restart Eclipse to take effect.

If Hibernate tools is installed properly, you are able to see the “Hibernate Perspective” in “Windows” >> “Open Perspective” >> “Others“.

5. Hibernate Tools

1. Hibernate Perspective

Open your “Hibernate Perspective“. In Eclipse IDE, select “Windows” >> “Open Perspective” >> “Others…” , choose “Hibernate“.

2. New Hibernate Configuration

In Hibernate Perspective, right click and select “Add Configuration…”

3. Set Classpath of Hibernate

You need to add the database driver to your classpath

1) Download the driver for your database

2) Point to it by clicking 'Add external jars' and selecting it from the place you downloaded it to

4. Generating Hibernate configuration file

In “Edit Configuration” dialog box,

In “Project” box, click on the “Browse..” button to select your project.

In “Database Connection” box, click “New..” button to create your database settings.

We need to specify the driver and connection details there

In “Configuration File” box, click “Setup” button to create a new or use existing “Hibernate configuration file”, hibernate.cfg.xml.

Source: http://www.mkyong.com/hibernate/how-to-install-hibernate-tools-in-eclipse-ide/

5. Creating a Hibernate Mapping File

Hibernate mapping files are used to specify how your objects relate to database tables.

To create basic mappings for properties and associations, i. e. generate .hbm.xml files, Hibernate Tools provide a basic wizard which you can display by selecting File → New → Hibernate XML mapping file.

At first you will be asked to select a package or multiple individual classes to map. It is also possible to create an empty file: do not select any packages or classes and an empty .hbm file will be created in the specified location.

Using the depth control option you can define the dependency depth used when choosing classes.

The next wizard page lists the mappings to be generated. 

The next wizard page display a preview of the generated .hbm files.

Clicking the Finish button creates the files.

Source: https://access.redhat.com/documentation/en-US/Red_Hat_JBoss_Developer_Studio/7.0/html/Hibernate_Tools_Reference_Guide/map_file_wizard.html

6.Hibernate Configuration files

The basic structure of a Java Application using Hibernate consist of the following files:

• hibernate.cfg.xml- It consist of the database connection details
• modelClass.hbm.xml- It describes the mapping between the POJO and the corresponding table in the database
• hibernate.reveng.xml- This is the reverse Engineering file for Hibernate

7. Hibernate types

A Hibernate type is a bridge between an SQL type and a Java primitive/Object type.

These are the types Hibernate supports by default:

Hibernate type (org.hibernate.type)	JDBC type	Java type
StringType	VARCHAR	String
MaterializedClob	CLOB	String
TextType	LONGVARCHAR	String
CharacterType	CHAR	char or Character
BooleanType	BIT	boolean or Boolean
Numeric	INTEGER (e.g. 0 = false and 1 = true)	BooleanType boolean or Boolean
YesNoType	CHAR (e.g. ‘N’ or ‘n’ = false and ‘Y’ or ‘y’ = true)	boolean or Boolean
TrueFalseType	CHAR (e.g. ‘F’ or ‘f’ = false and ‘T’ or ‘t’ = true)	boolean or Boolean
ByteType	TINYINT	byte or Byte
ShortType	SMALLINT	short or Short
IntegerType	INTEGER	int or Integer
LongType	BIGINT	long or Long
FloatType	FLOAT	float or Float
DoubleType	DOUBLE	double or Double
BigIntegerType	NUMERIC	BigInteger
BigDecimalType	NUMERIC	BigDecimal
TimestampType	TIMESTAMP	java.sql.Timestamp or java.util.Date
TimeType	TIME	java.sql.Time
DateType	DATE	java.sql.Date
CalendarType	TIMESTAMP	java.util.Calendar or java.util.GregorianCalendar
CalendarType	DATE	java.util.Calendar or java.util.GregorianCalendar
CurrencyType	VARCHAR	java.util.Currency
LocaleType	VARCHAR	java.util.Locale
TimeZoneType	VARCHAR	java.util.TimeZone
UrlType	VARCHAR	java.net.URL
ClassType	VARCHAR	java.lang.Class
BlobType	BLOB	java.sql.Blob
ClobType	CLOB	java.sql.Clob
BinaryType	VARBINARY	byte[] or Byte[]
BinaryType	BLOB	byte[] or Byte[]
BinaryType	LONGVARBINARY	byte[] or Byte[]
BinaryType	LONGVARBINARY	byte[] or Byte[]
CharArrayType	VARCHAR	char[] or Character[]
UUIDBinaryType	BINARY	java.util.UUID
UUIDBinaryType	CHAR or VARCHAR	java.util.UUID
UUIDBinaryType	PostgreSQL UUID	java.util.UUID
SerializableType	VARBINARY	Serializable

8.org.hibernate.engine.jndi.JndiException: Error parsing JNDI name

Solution : Remove the name attribute from  <session-factory> in hibernate.cfg.xml

9. Creating Jar using Ant

<target name="CreateJar" description="Create Jar file">

<jar jarfile="jarName.jar" basedir="src/"/>

</target>

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