How to invoke hbm2java from a java file.

Gowri · **Joined:** Thu Apr 17, 2008 2:03 pm **Posts:** 26

Is it possible to invoke hbm2java from a java file to generate hibernate mapping files and POJOs. I haven't seen any examples on how to do this way.

Appreciate your help.

Thanks,

Sukirtha · **Posted:** Mon Apr 21, 2008 12:23 am

Yes it is possible. If you are using an ant build for hbm2java, you can write a simple java code to invoke ant (I have tried it personally). And I guess there is a pure java way to invoke hbm2java without using ant. You have to choose which way to go about.

Gowri · **Joined:** Thu Apr 17, 2008 2:03 pm **Posts:** 26

Hi Sukirtha,

I appreciate your response. It would be helpful if you can give me a sample example.

Thanks in advance.

Sukirtha · **Posted:** Mon Apr 21, 2008 3:27 am

Build.xml

Code:

      <taskdef name="hibernatetool" classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="toolslib" />
      
      <target name = "hibernatetool" >
         <echo message="Starting hbm generation ..."></echo>
         <hibernatetool>
            <jdbcconfiguration propertyfile="hibernate.properties" revengfile="revenge.xml" packagename="sample">
               
            </jdbcconfiguration>
            <classpath refid="toolslib"/> 
            <hbm2hbmxml destdir="new" templatepath="src">
            </hbm2hbmxml>
         </hibernatetool>
         <echo message="Successfully generated hbm files"></echo>
         
         <echo message="Java class generation starting..."></echo>
         <hibernatetool>
            <configuration propertyfile="hibernate.properties">
               <fileset dir="sample" id="id">
                   <include name="*.hbm.xml"/>
               </fileset>
            </configuration>
            <hbm2java destdir="new/java"/>
         </hibernatetool>
         <echo message="Successfully generated java files"></echo>
      </target>

Java code

Code:

File buildFile = new File(file);
      Project p = new Project();
      String path = buildFile.getAbsolutePath();
      path = path.replaceAll("%20", " ");
      p.setUserProperty("ant.file", path);
      DefaultLogger consoleLogger = new DefaultLogger();
      consoleLogger.setErrorPrintStream(System.err);
      consoleLogger.setOutputPrintStream(System.out);
      consoleLogger.setMessageOutputLevel(Project.MSG_INFO);
      p.addBuildListener(consoleLogger);
      try {
         p.fireBuildStarted();
         p.init();
         ProjectHelper helper = ProjectHelper.getProjectHelper();
         p.addReference("ant.projectHelper", helper);
         helper.parse(p, buildFile);
         p.executeTarget(p.getDefaultTarget());
         p.fireBuildFinished(null);
      } catch (BuildException e) {
         p.fireBuildFinished(e);
      }

Don't forget to add all the dependency library files onto your classpath. Hope it helps!

sanne.grinovero · **Posted:** Mon Apr 21, 2008 12:54 pm

Hi,
this can be done much simpler; If it can be done by ant there must be
a direct way.
to run the schema export for example:

Code:

Configuration cfg = new Configuration().configure();
SchemaExport se = new SchemaExport(cfg);
se.create(false, true);

All the credit goes to the book "Java Persistence with Hibernate",
I really recommend it.

regards

Sukirtha · **Posted:** Mon Apr 21, 2008 11:22 pm

But I think schemaExport creates and drops tables in a schema based on the mapping changes. The actual question is to generate java files and hbm files from the schema. Do you have any such sample for hbm and java class generation using hbm2java and hbm2hbmxml? If so please share it. I would be interested. Thanks!

Gowri · **Joined:** Thu Apr 17, 2008 2:03 pm **Posts:** 26

You are right Sukirtha, I am interested in knowing about generating the java and mapping files based on a configuration file.

Also I really want to know about invoking hbm2java without using ant.

Any pointers are greatly appreciated...

Sukirtha · **Posted:** Wed Apr 23, 2008 12:26 am

Exactly. And Gowri, I suggest you post your doubt in the tools forum as well. That's the forum where all discussions on tools happen.