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Unable to locate appropriate constructor

sam White
Ranch Hand

Joined: Feb 18, 2011
Posts: 208
Hello,

I want to write a query in jpa criteriaquery. Here is the query:

SELECT node.category_name, (COUNT(parent.category_name) - 1) AS depth
FROM category_subcategories AS node,
category_subcategories AS parent
WHERE node.lft BETWEEN parent.lft AND parent.rgt
AND node.category_name = 'PORTABLE ELECTRONICS'
GROUP BY node.category_name
ORDER BY node.lft

Here is the code I come up with:



When I execue the test, it shown the following error:

Testcase: testDepthOfSubtree(au.com.houseware.server.ejb.entity.facade.CategorySubcategoriesFacadeTest): Caused an ERROR
org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [au.com.houseware.server.ejb.entity.CategorySubcategories] [select new au.com.houseware.server.ejb.entity.CategorySubcategories(generatedAlias0.categoryName, count(generatedAlias1.categoryName)) from au.com.houseware.server.ejb.entity.CategorySubcategories as generatedAlias0, au.com.houseware.server.ejb.entity.CategorySubcategories as generatedAlias1 where ( generatedAlias0.categoryName=:param0 ) and ( generatedAlias0.lft between generatedAlias1.lft and generatedAlias1.rgt ) group by generatedAlias0.categoryName]
java.lang.IllegalArgumentException: org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [au.com.houseware.server.ejb.entity.CategorySubcategories] [select new au.com.houseware.server.ejb.entity.CategorySubcategories(generatedAlias0.categoryName, count(generatedAlias1.categoryName)) from au.com.houseware.server.ejb.entity.CategorySubcategories as generatedAlias0, au.com.houseware.server.ejb.entity.CategorySubcategories as generatedAlias1 where ( generatedAlias0.categoryName=:param0 ) and ( generatedAlias0.lft between generatedAlias1.lft and generatedAlias1.rgt ) group by generatedAlias0.categoryName]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1201)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1147)
at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:324)
at org.hibernate.ejb.criteria.CriteriaQueryCompiler.compile(CriteriaQueryCompiler.java:227)
at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:441)
at au.com.houseware.server.ejb.entity.facade.CategorySubcategoriesFacadeMock.findDepthOfSubtreeBy_categoryName(CategorySubcategoriesFacadeMock.java:228)
at au.com.houseware.server.ejb.entity.facade.CategorySubcategoriesFacadeTest.testDepthOfSubtree(CategorySubcategoriesFacadeTest.java:44)
Caused by: org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [au.com.houseware.server.ejb.entity.CategorySubcategories] [select new au.com.houseware.server.ejb.entity.CategorySubcategories(generatedAlias0.categoryName, count(generatedAlias1.categoryName)) from au.com.houseware.server.ejb.entity.CategorySubcategories as generatedAlias0, au.com.houseware.server.ejb.entity.CategorySubcategories as generatedAlias1 where ( generatedAlias0.categoryName=:param0 ) and ( generatedAlias0.lft between generatedAlias1.lft and generatedAlias1.rgt ) group by generatedAlias0.categoryName]
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:82)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:261)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:124)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1770)
at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:306)

What is wrong with my criteriaQuery?

Any suggestion is very much appreciated.

Thanks
Sam
Arun Kumarr
Ranch Hand

Joined: May 16, 2005
Posts: 513

The exception is direct. There is some mismatch between the Class constructor arguments and your SQL return types.
Check if they are correct. Sometimes, you might just want to add a constructor with arguments as (Object obj1, Object obj2, ...) just to make sure it is called and try printing out the
object types.
For eg., the count might actually return the count value as double, but you might have declared it as Integer.


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