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Friday, August 1. 2008Hibernate with MySQL - a beginners guideThis article is an introduction from getting hibernate working from scratch. The only dependency is that you have a text editor, a working Java install, and ant. In this part of my guide, we will simply setup our environment, download some needed jar files and ensure that we can build an run a simple Java application. In the follow up part to this article, I will cover connecting to a database and doing a few interesting things with Hibernate. Lets start by setting up our directory structure. I like to include required jar files in 'lib'. This means that all the dependencies that my code needs are included within the same folder. This is my preference, if you wish to do it another way, you'll have to modify my code below. # the top level folder for our project $ mkdir hibernate $ cd hibernate $ mkdir lib $ mkdir src Obtain and extract HibernateNow, lets download hibernate from http://www.hibernate.org/6.html , at time of writing the 3.2.6.ga release was current, so that's what I downloaded. Extract the downloaded file into your lib folder. $ cd lib $ tar -xvzf hibernate-3.2.6.ga.tar.gz
There are a lot of lib files distributed with hibernate, you do not need them all. To see more information about what each one does, have a look at the file Obtain and extract MySQL ConnectorTo connect to MySQL with hibernate, you will need the MySQL connector. Download mysql connector from http://dev.mysql.com/downloads/connector/j/5.1.html. Extract this file into your lib folder, and copy over the required .jar file. $ tar -xvzf mysql-connector-java-5.1.6.tar.gz $ cp mysql-connector-java-5.1.6/mysql-connector-java-5.1.6-bin.jar . Configuring ant
Here is the contents of the <project name="hibernate-tutorial" default="compile"> <property name="sourcedir" value="${basedir}/src"/> <property name="targetdir" value="${basedir}/bin"/> <property name="librarydir" value="${basedir}/lib"/> <path id="libraries"> <fileset dir="${librarydir}"> <include name="*.jar"/> </fileset> </path> <target name="clean"> <delete dir="${targetdir}"/> <mkdir dir="${targetdir}"/> </target> <target name="compile" depends="clean, copy-resources"> <javac srcdir="${sourcedir}" destdir="${targetdir}" classpathref="libraries"> <compilerarg value="-Xlint"/> </javac> </target> <target name="copy-resources"> <copy todir="${targetdir}"> <fileset dir="${sourcedir}"> <exclude name="**/*.java"/> </fileset> </copy> </target> <target name="run" depends="compile"> <java fork="true" classname="events.EventManager" classpathref="libraries"> <classpath path="${targetdir}"/> <arg value="${action}"/> </java> </target> </project> Before going any furtherer, lets make sure what we have so far works. # cat src/uk/co/pookey/hibernate/HibernateUtil.javapackage uk.co.pookey.hibernate; public class HibernateUtil { public static void main (String[] args) { System.out.println("ok!"); } } If everything went to plan, you should see the following output: # ant run Buildfile: build.xml clean: [delete] Deleting directory /home/pookey/hibernate/bin [mkdir] Created dir: /home/pookey/hibernate/bin copy-resources: [copy] Copying 1 file to /home/pookey/hibernate/bin [copy] Copied 4 empty directories to 2 empty directories under /home/pookey/hibernate/bin compile: [javac] Compiling 1 source file to /home/pookey/hibernate/bin [javac] warning: [path] bad path element "/usr/share/ant/lib/xml-apis.jar": no such file or directory [javac] warning: [path] bad path element "/usr/share/ant/lib/xercesImpl.jar": no such file or directory [javac] warning: [path] bad path element "/usr/share/ant/lib/xalan.jar": no such file or directory [javac] 3 warnings run: [java] ok! BUILD SUCCESSFUL Total time: 0 seconds Assuming this all works, now it's time to move on to part 2! Comments
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Should the classname not read uk.co.pookey.hibernate.HibernateUtil or am I mistaken?
You have an error in your ant script around line 35. You need to change the following from
classname="events.EventManager" to classname="uk.co.pookey.hibernate.HibernateUtil" Thanks anyway, like what you have done so far  Cheers
Hello,
Can anyone let me know what should be the commands to compile and run this to get the above mentioned output? am using $>ant compile thats giving BUILD SUCCESSFUL but what to get rest of the output? Please help. Thanks!
Use $> ant run
The "run" target will automatically call the "compile" target
Thanks for this easy-to-follow (considering the alternatives) tutorial. Had a few problems with my java install but nothing a troubleshoot didn't fix.
Thanks
Buildfile: build.xml
clean: [delete] Deleting directory C:\a_projects\samples\java\samples\joe\hibernate\bin [mkdir] Created dir: C:\a_projects\samples\java\samples\joe\hibernate\bin copy-resources: [copy] Copying 2 files to C:\a_projects\samples\java\samples\joe\hibernate\bin compile: [javac] Compiling 3 source files to C:\a_projects\samples\java\samples\joe\hibernate\bin run: [java] Exception in thread "main" java.lang.StackOverflowError [java] at java.lang.String.intern(Native Method) [java] at java.lang.Class.searchMethods(Class.java:2618) [java] at java.lang.Class.getMethod0(Class.java:2642) [java] at java.lang.Class.getMethod(Class.java:1579) [java] at org.apache.commons.logging.LogFactory.getContextClassLoader(LogFactory.java:438) [java] at org.apache.commons.logging.LogFactory$1.run(LogFactory.java:222) [java] at java.security.AccessController.doPrivileged(Native Method) [java] at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:218) ... close to 1,000 lines of this exact same message ... [java] at org.slf4j.impl.JCLLoggerFactory.getLogger(JCLLoggerFactory.java:69) [java] at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:161) [java] at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155) [java] Java Result: 1 |
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This post is a follow on from my previous post Hibernate with MySQL - a beginners guide - part 1. Having followed part 1, you should have a simple java application that prints 'ok', an ant build script, and downloaded hibernate and the MySQL connecto
Tracked: Aug 01, 18:17
In part 1 and part 2 I showed how to get up and running with hibernate. This part continues from where we left off. I have packaged up all the files form part 2, including all required jars, and the build script. The file is 4.5meg, and is down
Tracked: Aug 01, 22:14