session.load() and joined-subclass error

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

Hi all,

i need some explanation of the following error:

Code:

IllegalArgumentException occurred calling getter of com.tecdoc.db_update.hibernate.Bean_Update_Installation.idInstall
and 
java.lang.IllegalArgumentException: object is not an instance of declaring class

This error occurs when i call this method:

Code:

    public static Bean_Update_Installation loadInstall(Integer id)
            throws IOException, ServletException, HibernateException {

        Session hibernate_session = HibernateUtil.currentSession();
        Transaction tx = hibernate_session.beginTransaction();
        Bean_Update_Installation inst = new Bean_Update_Installation();

        try {
            tx = hibernate_session.beginTransaction();

            inst = (Bean_Update_Installation) hibernate_session.load(
                    Bean_Update_Installation.class, id);
            tx.commit();

        } catch (Exception e) {
            e.printStackTrace(System.err);
            if (tx != null)
                tx.rollback();
        } finally {
            HibernateUtil.closeSession();
        }
        return inst;
    }

The mapping is:

Code:

<hibernate-mapping>
    <class name="com.tecdoc.db_update.hibernate.Bean_Update_Installation" 
        table="t_Update_Installation">
        <id name="idInstall" column="idInstall" 
            type="integer">
            <generator class="identity">
            </generator>
        </id>
        <property name="installDatum" column="installDatum" 
            type="java.lang.String"/>
        <property name="installVon" column="installVon" 
            type="java.lang.String"/>
        <property name="installBemerkung" column="installBemerkung" 
            type="java.lang.String"/>
        <many-to-one name="teilUpdate" 
            class="com.tecdoc.db_update.hibernate.Bean_Update" not-null="true"/>

        <joined-subclass name="com.tecdoc.db_update.hibernate.Bean_Datenbank" 
            table="t_Datenbank">
            <key column="idDb"/>
            <many-to-one name="server" 
                class="com.tecdoc.db_update.hibernate.Bean_Server" 
                not-null="true"/>
            <many-to-one name="sid" 
                class="com.tecdoc.db_update.hibernate.Bean_SID" 
                not-null="true"/>
        </joined-subclass>
    
        <joined-subclass name="com.tecdoc.db_update.hibernate.Bean_Applikation" 
            table="t_Applikation">
            <key column="idApplikation"/>
            <many-to-one name="app" 
                class="com.tecdoc.db_update.hibernate.Bean_App" not-null="true"/>
        </joined-subclass>
    </class>
</hibernate-mapping>

Thanks in advance.

lorban · **Posted:** Mon Jul 19, 2004 3:35 pm

What is the java code of class Bean_Update_Installation ?

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

Code for Bean_Update_Installation:
[code]
public class Bean_Update_Installation implements Serializable {

public Bean_Update_Installation() {
}

private Integer idInstall;
private String installDatum;
private String installVon; // Werte in (Ressin, Wollschl

lorban · **Posted:** Tue Jul 20, 2004 3:45 am

I can't see any problem.

Could you try to provide more data about the problem ? Full stack trace ? Debug level Hibernate log ?

Please provide as much as you can.

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

Code:

net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.tecdoc.db_update.hibernate.Bean_Update_Installation.idInstall
   at net.sf.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:110)
   at net.sf.hibernate.persister.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:307)
   at net.sf.hibernate.proxy.HibernateProxyHelper.getIdentifier(HibernateProxyHelper.java:50)
   at net.sf.hibernate.type.EntityType.toString(EntityType.java:84)
   at net.sf.hibernate.type.PersistentCollectionType.toString(PersistentCollectionType.java:82)
   at net.sf.hibernate.impl.Printer.toString(Printer.java:49)
   at net.sf.hibernate.impl.Printer.toString(Printer.java:82)
   at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2245)
   at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2203)
   at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
   at com.tecdoc.db_update.utils.HibernateQueryUtil.getAppCollection(HibernateQueryUtil.java:458)
   at com.tecdoc.db_update.struts.actions.Action_new_update_install.execute(Action_new_update_install.java:63)
   at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
   at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
   at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
   at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
   at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
   at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
   at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
   at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at net.sf.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:96)
   ... 41 more

this error occurs always when i try to select or load some data of type update_installation.

by the way how can i get more debug-information?

lorban · **Posted:** Tue Jul 20, 2004 4:40 am

As far as I can see, you already have enabled debug logs. Have a look at the log4j (or whatever other logging framework you are using) doc for more details.

If I'm not mistaken, you can workaround this problem by disabling logs.

This problem *could* be a bug in Hibernate. I'd be interrested to debug through it.

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

first, thanks for your reply!

i commented out the hibernate-lines in the log4j.properties but it has no effect on the console-output and the error still occurs.

i think i have to try a different mapping-solution.

working on it.

gavin · **Posted:** Tue Jul 20, 2004 11:01 am

Explicitly set

log4j.logger.net.sf.hibernate=info

and see if the problem goes away.

The exception is occurring in Hibernate's logging code.

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

unfortunately it's the same error after setting

log4j.logger.net.sf.hibernate=info

hmmm.

gavin · **Posted:** Tue Jul 20, 2004 11:22 am

Sorry, I don't believe you. Printer is only called is logging is enabled.

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

i think you're right gavin but what can i do to swith logging off?

i use eclipse 3.0 tomcat projekt.

i only have one log4j.properties file and it looks like this (also compiled in the 'classes' directory):

Code:

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.appender.stdout=org.apache.catalina.session.ManagerBase

### direct messages to file hibernate.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=hibernate.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

log4j.logger.net.sf.hibernate=info

### log just the SQL
log4j.logger.net.sf.hibernate.SQL=info

### log JDBC bind parameters ###
log4j.logger.net.sf.hibernate.type=info

### log schema export/update ###
#log4j.logger.net.sf.hibernate.tool.hbm2ddl=debug

### log cache activity ###
#log4j.logger.net.sf.hibernate.cache=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.net.sf.hibernate.connection.DriverManagerConnectionProvider=trace

but i get the same error-msg:

Code:

net.sf.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.tecdoc.db_update.hibernate.Bean_Update_Installation.idInstall
   at net.sf.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:110)
   at net.sf.hibernate.persister.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:307)
   at net.sf.hibernate.proxy.HibernateProxyHelper.getIdentifier(HibernateProxyHelper.java:50)
   at net.sf.hibernate.type.EntityType.toString(EntityType.java:84)
   at net.sf.hibernate.type.PersistentCollectionType.toString(PersistentCollectionType.java:82)
   at net.sf.hibernate.impl.Printer.toString(Printer.java:49)
...

i have no idea, why!

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

i have commons-logging and log4j jars in my classpath of my eclipse-project.

but i can't find any properties-file for the commons-logging.

may that's a reason for the logging not to disappear when i change the log4j.properties ?

spartacus · **Joined:** Thu Jul 22, 2004 7:24 am **Posts:** 10

tortenegger wrote:

may that's a reason for the logging not to disappear when i change the log4j.properties ?

Looks like your log4j.properties is not accessible. I had a similar problem.

Found that commons-logging-1.0.3.jar referred to a log4j.jar in it's manifest:
Class-Path: log4j.jar log4j-core.jar.

So for log4j to work correctly, the log4j.jar file should be available in the same directory as the commons-logging file.

After that you still need to provide the switch in your application startup:
-Dlog4j.configuration=file:/path/to/log4j.properties

I got log4j to work with these changes.

Hope this helps.

tortenegger · **Joined:** Wed Jun 16, 2004 8:26 am **Posts:** 19

thx spartacus,

i recognized what was wrong:

my log4j.properties was in the struts-'resources' folder from the struts framework by default.

i put it into the src-root and than log4j was able to detect it and now my changes take effect!

by the way the error mentioned above disappeared :)

so i'm able to step deeper into my first hibernate-application.

thx

PS:
right now, i'm dealing with another error (WrongClassException of a collection) but i will see if i can manage it by myself (i hope so)