NullPointerException when executing SchemaExportTask

Johan Kumps · **Joined:** Tue Mar 08, 2005 6:04 pm **Posts:** 4

Hi all,

I'm trying to generate the database schema using my mapping files. I keep getting the exception below.

One of my mapping files is as follows :

Code:

<?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>
<!-- 
    Created by the Middlegen Hibernate plugin 2.1

    http://boss.bekk.no/boss/middlegen/
    http://www.hibernate.org/
-->

<class 
    name="be.milieuinfo.cbb.model.AdresBe" 
    table="adres_be"
>
    <meta attribute="class-description" inherit="false">
       @hibernate.class
        table="adres_be"
    </meta>

    <id
        name="adrbeId"
        type="java.lang.Integer"
        column="adrbe_id"
    >
        <meta attribute="field-description">
           @hibernate.id
            generator-class="assigned"
            type="java.lang.Integer"
            column="adrbe_id"

        </meta>
        <generator class="assigned" />
    </id>

    <property
        name="datumCreatie"
        type="java.sql.Date"
        column="datum_creatie"
        not-null="true"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="datum_creatie"
            length="4"
            not-null="true"
        </meta>    
    </property>
    <property
        name="userCreatie"
        type="java.lang.String"
        column="user_creatie"
        not-null="true"
        length="50"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="user_creatie"
            length="50"
            not-null="true"
        </meta>    
    </property>
    <property
        name="datumAanpassing"
        type="java.sql.Date"
        column="datum_aanpassing"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="datum_aanpassing"
            length="4"
        </meta>    
    </property>
    <property
        name="userAanpassing"
        type="java.lang.String"
        column="user_aanpassing"
        length="50"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="user_aanpassing"
            length="50"
        </meta>    
    </property>
    <property
        name="updatecount"
        type="int"
        column="updatecount"
        not-null="true"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="updatecount"
            length="4"
            not-null="true"
        </meta>    
    </property>

    <!-- Associations -->
      
    <!-- bi-directional one-to-many association to AdresBeHist -->
    <set
        name="adresBeHists"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.AdresBeHist"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.AdresBeHist"
        />
    </set>
    <!-- bi-directional one-to-many association to AdresPerceel -->
    <set
        name="adresPerceels"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.AdresPerceel"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.AdresPerceel"
        />
    </set>
    <!-- bi-directional one-to-many association to ExploitantAdre -->
    <set
        name="exploitantAdres"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.ExploitantAdre"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.ExploitantAdre"
        />
    </set>
    <!-- bi-directional one-to-many association to Exploitatie -->
    <set
        name="exploitaties"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.Exploitatie"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.Exploitatie"
        />
    </set>

</class>
</hibernate-mapping>

Does anybody have an idea of what could be going wrong here?

Thanks in advance for helping me out.

Johan,

Hibernate version: 2.1.6

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Code:

[schemaexport] java.lang.NullPointerException
[schemaexport]  at net.sf.hibernate.util.StringHelper.qualify(StringHelper.java:239)
[schemaexport]  at net.sf.hibernate.cfg.Binder.bindComponent(Binder.java:734)
[schemaexport]  at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:257)
[schemaexport]  at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1173)
[schemaexport]  at net.sf.hibernate.cfg.Configuration.add(Configuration.java:245)
[schemaexport]  at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:167)
[schemaexport]  at net.sf.hibernate.tool.hbm2ddl.SchemaExportTask.getConfiguration(SchemaExportTask.
java:185)
[schemaexport]  at net.sf.hibernate.tool.hbm2ddl.SchemaExportTask.execute(SchemaExportTask.java:131)

[schemaexport]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
[schemaexport]  at org.apache.tools.ant.Task.perform(Task.java:364)
[schemaexport]  at org.apache.tools.ant.Target.execute(Target.java:341)
[schemaexport]  at org.apache.tools.ant.Target.performTasks(Target.java:369)
[schemaexport]  at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
[schemaexport]  at org.apache.tools.ant.Project.executeTargets(Project.java:1062)
[schemaexport]  at org.apache.tools.ant.Main.runBuild(Main.java:673)
[schemaexport]  at org.apache.tools.ant.Main.startAnt(Main.java:188)
[schemaexport]  at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
[schemaexport]  at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)

Name and version of the database you are using:Informix, also tried on MySQL.

orbitphreak · **Posted:** Wed Jan 25, 2006 2:53 pm

Don't know if this is applicable to version 2.0, but in version 3.1, I solved the problem by using the HibernateToolTask instead of the SchemaExportTask. Here's an explanation:

http://www.digital-seven.net/?option=co ... view&id=71

Johan Kumps wrote:

Hi all,

I'm trying to generate the database schema using my mapping files. I keep getting the exception below.

One of my mapping files is as follows :

Code:

<?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>
<!-- 
    Created by the Middlegen Hibernate plugin 2.1

    http://boss.bekk.no/boss/middlegen/
    http://www.hibernate.org/
-->

<class 
    name="be.milieuinfo.cbb.model.AdresBe" 
    table="adres_be"
>
    <meta attribute="class-description" inherit="false">
       @hibernate.class
        table="adres_be"
    </meta>

    <id
        name="adrbeId"
        type="java.lang.Integer"
        column="adrbe_id"
    >
        <meta attribute="field-description">
           @hibernate.id
            generator-class="assigned"
            type="java.lang.Integer"
            column="adrbe_id"

        </meta>
        <generator class="assigned" />
    </id>

    <property
        name="datumCreatie"
        type="java.sql.Date"
        column="datum_creatie"
        not-null="true"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="datum_creatie"
            length="4"
            not-null="true"
        </meta>    
    </property>
    <property
        name="userCreatie"
        type="java.lang.String"
        column="user_creatie"
        not-null="true"
        length="50"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="user_creatie"
            length="50"
            not-null="true"
        </meta>    
    </property>
    <property
        name="datumAanpassing"
        type="java.sql.Date"
        column="datum_aanpassing"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="datum_aanpassing"
            length="4"
        </meta>    
    </property>
    <property
        name="userAanpassing"
        type="java.lang.String"
        column="user_aanpassing"
        length="50"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="user_aanpassing"
            length="50"
        </meta>    
    </property>
    <property
        name="updatecount"
        type="int"
        column="updatecount"
        not-null="true"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="updatecount"
            length="4"
            not-null="true"
        </meta>    
    </property>

    <!-- Associations -->
      
    <!-- bi-directional one-to-many association to AdresBeHist -->
    <set
        name="adresBeHists"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.AdresBeHist"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.AdresBeHist"
        />
    </set>
    <!-- bi-directional one-to-many association to AdresPerceel -->
    <set
        name="adresPerceels"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.AdresPerceel"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.AdresPerceel"
        />
    </set>
    <!-- bi-directional one-to-many association to ExploitantAdre -->
    <set
        name="exploitantAdres"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.ExploitantAdre"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.ExploitantAdre"
        />
    </set>
    <!-- bi-directional one-to-many association to Exploitatie -->
    <set
        name="exploitaties"
        lazy="false"
        inverse="true"
      cascade="none"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="false"
            inverse="true"
            cascade="none"

           @hibernate.collection-key
            column="adrbe_id"

           @hibernate.collection-one-to-many
            class="be.milieuinfo.cbb.model.Exploitatie"
        </meta>
        <key>
            <column name="adrbe_id" />
        </key>
        <one-to-many 
            class="be.milieuinfo.cbb.model.Exploitatie"
        />
    </set>

</class>
</hibernate-mapping>

Does anybody have an idea of what could be going wrong here?

Thanks in advance for helping me out.

Johan,

Hibernate version: 2.1.6

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Code:

[schemaexport] java.lang.NullPointerException
[schemaexport]  at net.sf.hibernate.util.StringHelper.qualify(StringHelper.java:239)
[schemaexport]  at net.sf.hibernate.cfg.Binder.bindComponent(Binder.java:734)
[schemaexport]  at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:257)
[schemaexport]  at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1173)
[schemaexport]  at net.sf.hibernate.cfg.Configuration.add(Configuration.java:245)
[schemaexport]  at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:167)
[schemaexport]  at net.sf.hibernate.tool.hbm2ddl.SchemaExportTask.getConfiguration(SchemaExportTask.
java:185)
[schemaexport]  at net.sf.hibernate.tool.hbm2ddl.SchemaExportTask.execute(SchemaExportTask.java:131)

[schemaexport]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
[schemaexport]  at org.apache.tools.ant.Task.perform(Task.java:364)
[schemaexport]  at org.apache.tools.ant.Target.execute(Target.java:341)
[schemaexport]  at org.apache.tools.ant.Target.performTasks(Target.java:369)
[schemaexport]  at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
[schemaexport]  at org.apache.tools.ant.Project.executeTargets(Project.java:1062)
[schemaexport]  at org.apache.tools.ant.Main.runBuild(Main.java:673)
[schemaexport]  at org.apache.tools.ant.Main.startAnt(Main.java:188)
[schemaexport]  at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
[schemaexport]  at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)

Name and version of the database you are using:Informix, also tried on MySQL.