NullpointerException with CodeGenerator

GG_Peter · **Posted:** Wed Apr 21, 2004 11:58 am

When running CodeGenerator to convert my hbm.xml files into java files. I get the following Exception. With the ant build the result is the same. Am I forgetting something? Any ideas?

Exception
17:47:03,453 INFO Generator:95 - Generating 1 in D:\Applicatie\development\WEB-INF\build\gen-src\
java.lang.NullPointerException
at net.sf.hibernate.tool.hbm2java.BasicRenderer.isPropertySet(BasicRenderer.java:611)
at net.sf.hibernate.tool.hbm2java.BasicRenderer.generateConcreteEmptyClasses(BasicRenderer.java:332)
at net.sf.hibernate.tool.hbm2java.BasicRenderer.render(BasicRenderer.java:59)
at net.sf.hibernate.tool.hbm2java.Generator.write(Generator.java:138)
at net.sf.hibernate.tool.hbm2java.Generator.writeRecur(Generator.java:115)
at net.sf.hibernate.tool.hbm2java.Generator.generate(Generator.java:104)
at net.sf.hibernate.tool.hbm2java.CodeGenerator.main(CodeGenerator.java:125)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.intellij.rt.execution.application.AppMain.main(Unknown Source)

One of my mapping files.
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >

<hibernate-mapping>


<class name="test.hibernate.Land" table="land" >
<meta attribute="class-description" inherit="false">
@hibernate.class
table="land"
</meta>

<id name="id" type="java.lang.String" column="Id">
<meta attribute="field-description">
@hibernate.id
generator-class="assigned"
type="java.lang.String"
column="Id"
</meta>
<generator class="assigned" />
</id>

<property name="code" type="java.lang.String" column="Code" not-null="true" unique="true" length="3">
<meta attribute="field-description">
@hibernate.property
column="Code"
length="3"
not-null="true"
</meta>
</property>

<property name="naam" type="java.lang.String" column="Naam" length="35">
<meta attribute="field-description">
@hibernate.property
column="Naam"
length="35"
</meta>
</property>



</class>
</hibernate-mapping>

max · **Posted:** Wed Apr 21, 2004 6:53 pm

a bug in the current release requires you to point to a config.xml file via the commandline.

search the docs + forum for more instructions

immanuel · **Joined:** Tue Jan 13, 2004 4:57 am **Posts:** 83

max wrote:

a bug in the current release requires you to point to a config.xml file via the commandline.

search the docs + forum for more instructions

I.e.: if you are using ANT to launch hbm2java you need to use the hbm2java config attribute to pass the tool an xml file with the following inside:

<codegen>
<generate renderer="net.sf.hibernate.tool.hbm2java.BasicRenderer"/>
</codegen>

if you are using the commandline version I believe you must use --config but I'm not sure since this was not my case.

immanuel · **Joined:** Tue Jan 13, 2004 4:57 am **Posts:** 83

immanuel wrote:

max wrote:

a bug in the current release requires you to point to a config.xml file via the commandline.

search the docs + forum for more instructions

I.e.: if you are using ANT to launch hbm2java you need to use the hbm2java config attribute to pass the tool an xml file with the following inside:

<codegen>
<generate renderer="net.sf.hibernate.tool.hbm2java.BasicRenderer"/>
</codegen>

if you are using the commandline version I believe you must use --config but I'm not sure since this was not my case.

But remark there's another bug in the current hbm2java version which causes wrong equals() generation, so you may probably want to patch hbm2java before using it.

GG_Peter · **Posted:** Thu Apr 22, 2004 4:47 am

Thanks for the replies. But it still throws the same exception. I did already place the config option in my ant task the previous time.

So I still make a mistake somewhere. Question is: where?

build.xml

Code:

<target name="hbm2java" description="Generate .java from .hbm files." depends="compile-hibernate">
        
  <mkdir dir="${build.gen-src.dir}"/>
  <taskdef
    name="hbm2java"
    classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask"
    classpathref="lib.class.path"
  />
     
  <hbm2java output="${build.gen-src.dir}" classpathref="lib.class.path" config="D:/Applicatie/development/WEB-INF/build/classes/hibernate.cfg.xml">
    <fileset dir="${build.gen-src.dir}">
      <include name="**/*.hbm.xml"/>
    </fileset>
  </hbm2java>
        
</target>

hibernate.cfg.xml

Code:

<?xml version='1.0' encoding='utf-8'?>
 <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 2.0//EN"
 "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>
    <session-factory>

        <property name="connection.url">jdbc:mysql:///ngb</property>
        <property name="connection.driver_class">org.gjt.mm.mysql.Driver</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.username">root</property>
        <property name="connection.password" />
        <property name="show_sql">false</property>
        <property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>

        <mapping resource="test/hibernate/Gebruiker.hbm.xml" />
        <mapping resource="test/hibernate/Gebruikerrol.hbm.xml" />
        <mapping resource="test/hibernate/Klasse.hbm.xml" />
        <mapping resource="test/hibernate/Land.hbm.xml" />
        <mapping resource="test/hibernate/Periode.hbm.xml" />
        <mapping resource="test/hibernate/Ploeg.hbm.xml" />
        <mapping resource="test/hibernate/Ploegrenner.hbm.xml" />
        <mapping resource="test/hibernate/Puntentabel.hbm.xml" />
        <mapping resource="test/hibernate/Renner.hbm.xml" />
        <mapping resource="test/hibernate/Uitslag.hbm.xml" />
        <mapping resource="test/hibernate/Wedstrijd.hbm.xml" />

        <codegen>
            <generate renderer="net.sf.hibernate.tool.hbm2java.BasicRenderer"/>
        </codegen>

    </session-factory>
</hibernate-configuration>

immanuel · **Joined:** Tue Jan 13, 2004 4:57 am **Posts:** 83

Uhm, not sure you must make it point to an hibernate.cfg.xml!!! The xml I've pasted is the same exact xml I have in my hbm2java-config.xml, and it's that file I give it in the config option.

GG_Peter · **Posted:** Thu Apr 22, 2004 5:01 am

I've just tried it with the hbm2java config like you said. And it worked. Thanks!
So I guess putting it in my hibernate.cfg.xml was the problem.

immanuel · **Joined:** Tue Jan 13, 2004 4:57 am **Posts:** 83

GG_Peter wrote:

I've just tried it with the hbm2java config like you said. And it worked. Thanks!
So I guess putting it in my hibernate.cfg.xml was the problem.

Yes, hbm2java has a different config structure.