Hello! I'm a beginner in Hibernate and I get the following error:

org.hibernate.QueryException: could not resolve property: parentId of: eurolegis.AboutEutree [from eurolegis.AboutEutree o where o.parentId = 0]

What can be the problem?

A bit more information would convince some other to give you a hand.... :)

Post your mapping, the code, stacktrace, version of hibernate etc.

read this:
http://www.hibernate.org/ForumMailinglists/HowToAskForHelp

I guess AboutEutree has no property mapped to "parentId".........

simon

Sorry for giving so few details :)

The files have been generated with Hibernate Tools for Eclipse.
The database is PostgreSQL and the table in this case has the structure:
CREATE TABLE eurolegis."AboutEUTree"
(
"TextRo" numeric,
"ParentId" numeric,
"TitleRo" text,
"TitleEn" text,
nivel int2
)
------------------------------------------------------------------
The files are:

1. AboutEutree.java

public class AboutEutree implements java.io.Serializable {


// Fields

private AboutEutreeId id;


// Constructors

/** default constructor */
public AboutEutree() {
}


/** full constructor */
public AboutEutree(AboutEutreeId id) {
this.id = id;
}

// Property accessors

public AboutEutreeId getId() {
return this.id;
}

public void setId(AboutEutreeId id) {
this.id = id;
}
}

------------------------------------------------------------------
2. AboutEutreeId.java

import java.math.BigDecimal;


/**
* AboutEutreeId generated by hbm2java
*/

public class AboutEutreeId implements java.io.Serializable {


// Fields

private BigDecimal textRo;
private BigDecimal parentId;
private String titleRo;
private String titleEn;


// Constructors

/** default constructor */
public AboutEutreeId() {
}


/** full constructor */
public AboutEutreeId(BigDecimal textRo, BigDecimal parentId, String titleRo, String titleEn) {
this.textRo = textRo;
this.parentId = parentId;
this.titleRo = titleRo;
this.titleEn = titleEn;
}



// Property accessors

public BigDecimal getTextRo() {
return this.textRo;
}

public void setTextRo(BigDecimal textRo) {
this.textRo = textRo;
}

public BigDecimal getParentId() {
return this.parentId;
}

public void setParentId(BigDecimal parentId) {
this.parentId = parentId;
}

public String getTitleRo() {
return this.titleRo;
}

public void setTitleRo(String titleRo) {
this.titleRo = titleRo;
}

public String getTitleEn() {
return this.titleEn;
}

public void setTitleEn(String titleEn) {
this.titleEn = titleEn;
}




public boolean equals(Object other) {
if ( (this == other ) ) return true;
if ( (other == null ) ) return false;
if ( !(other instanceof AboutEutreeId) ) return false;
AboutEutreeId castOther = ( AboutEutreeId ) other;

return ( (this.getTextRo()==castOther.getTextRo()) || ( this.getTextRo()!=null && castOther.getTextRo()!=null && this.getTextRo().equals(castOther.getTextRo()) ) )
&& ( (this.getParentId()==castOther.getParentId()) || ( this.getParentId()!=null && castOther.getParentId()!=null && this.getParentId().equals(castOther.getParentId()) ) )
&& ( (this.getTitleRo()==castOther.getTitleRo()) || ( this.getTitleRo()!=null && castOther.getTitleRo()!=null && this.getTitleRo().equals(castOther.getTitleRo()) ) )
&& ( (this.getTitleEn()==castOther.getTitleEn()) || ( this.getTitleEn()!=null && castOther.getTitleEn()!=null && this.getTitleEn().equals(castOther.getTitleEn()) ) );
}

public int hashCode() {
int result = 17;

result = 37 * result + ( getTextRo() == null ? 0 : this.getTextRo().hashCode() );
result = 37 * result + ( getParentId() == null ? 0 : this.getParentId().hashCode() );
result = 37 * result + ( getTitleRo() == null ? 0 : this.getTitleRo().hashCode() );
result = 37 * result + ( getTitleEn() == null ? 0 : this.getTitleEn().hashCode() );
return result;
}
}
-------------------------------------------------------------------------
3. AboutEutree.hbm.xml:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 1, 2006 12:23:49 PM by Hibernate Tools 3.1.0.beta4 -->
<hibernate-mapping>
<class name="eurolegis.AboutEutree" table="&quot;AboutEUTree&quot;" schema="&quot;eurolegis&quot;">
<composite-id name="id" class="eurolegis.AboutEutreeId">
<key-property name="textRo" type="big_decimal">
<column name="&quot;TextRo&quot;" precision="65535" scale="65531" />
</key-property>
<key-property name="parentId" type="big_decimal">
<column name="&quot;ParentId&quot;" precision="65535" scale="65531" />
</key-property>
<key-property name="titleRo" type="string">
<column name="&quot;TitleRo&quot;" />
</key-property>
<key-property name="titleEn" type="string">
<column name="&quot;TitleEn&quot;" />
</key-property>
</composite-id>
</class>
</hibernate-mapping>

------------------------------------------------------------
4. test.jsp:

rez = sess.createQuery("from AboutEutree o where o.parentId = "+id)
.list();
-------------------------------------------------------------
The exception trace is:

org.hibernate.QueryException: could not resolve property: parentId of: eurolegis.AboutEutree [from eurolegis.AboutEutree o where o.parentId = 0]
at org.hibernate.persister.entity.AbstractPropertyMapping.throwPropertyException(AbstractPropertyMapping.java:43)
at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:37)
at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1265)
at org.hibernate.hql.ast.tree.FromElementType.getPropertyType(FromElementType.java:279)
at org.hibernate.hql.ast.tree.FromElement.getPropertyType(FromElement.java:372)
at org.hibernate.hql.ast.tree.DotNode.getDataType(DotNode.java:539)
at org.hibernate.hql.ast.tree.DotNode.prepareLhs(DotNode.java:221)
at org.hibernate.hql.ast.tree.DotNode.resolve(DotNode.java:172)
at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:94)
at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:90)
at org.hibernate.hql.ast.HqlSqlWalker.resolve(HqlSqlWalker.java:660)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1215)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4032)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3518)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1758)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:776)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:577)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:218)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:158)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:109)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:75)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:54)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:71)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:134)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:113)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1602)
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 org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at $Proxy0.createQuery(Unknown Source)
at org.apache.jsp.eurolegis.abouteu_jsp._jspService(org.apache.jsp.eurolegis.abouteu_jsp:96)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)

-----------------------------------------------------------------------------

Thanks in advance

But shouldn't this be

rez = sess.createQuery("from AboutEutree o where o.id.parentId = "+id)
.list();

than,

rez = sess.createQuery("from AboutEutree o where o.parentId = "+id)
.list();

Check if it works.

Thanks a lot, it worked!