Question

I’m porting from Hibernate. What’s wrong with SIZE function in the JPQL statement (assuming the mappings are correct)?:

SELECT NEW de.poyry.pqgenerator.view.PqListItem(
 pq.id,
 pq.name,
 pq.submissionDate,
 pe.firstName,
 pe.lastName,
 SIZE(pa))
FROM Prequalification pq
 JOIN pq.user us
 JOIN us.person pe
 LEFT JOIN pq.partnerships pa
 LEFT JOIN pa.company co
GROUP BY pq.id

Here’s the constructor signature (the only constructor):

public PqListItem(Integer id, String name, Date submissionDate,
                  String ownerFirstName, String ownerLastName,
                  Integer numPartnerships)

The query results in:

Caused by: Exception [EclipseLink-8023] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Syntax error parsing the query [^^...].
Internal Exception: org.eclipse.persistence.internal.libraries.antlr.runtime.EarlyExitException
    at org.eclipse.persistence.exceptions.JPQLException.syntaxError(JPQLException.java:352)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.handleRecognitionException(JPQLParser.java:354)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.addError(JPQLParser.java:246)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.reportError(JPQLParser.java:363)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.pathExpression(JPQLParser.java:2894)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.collectionValuedPathExpression(JPQLParser.java:2624)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.size(JPQLParser.java:7660)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.functionsReturningNumerics(JPQLParser.java:6710)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.arithmeticPrimary(JPQLParser.java:4762)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.arithmeticFactor(JPQLParser.java:4660)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.arithmeticTerm(JPQLParser.java:4546)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.simpleArithmeticExpression(JPQLParser.java:4462)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.scalarExpression(JPQLParser.java:4834)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.constructorItem(JPQLParser.java:1980)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.constructorExpression(JPQLParser.java:1849)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectExpression(JPQLParser.java:1300)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectItem(JPQLParser.java:1169)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectClause(JPQLParser.java:1081)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectStatement(JPQLParser.java:359)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.document(JPQLParser.java:281)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.parse(JPQLParser.java:134)
    at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.buildParseTree(JPQLParser.java:95)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:215)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:190)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:142)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:126)
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1475)
    ... 139 more
Caused by: org.eclipse.persistence.internal.libraries.antlr.runtime.EarlyExitException
    at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.pathExpression(JPQLParser.java:2882)
    ... 161 more

The SIZE(pa) seems to cause problems. When changing to SIZE(pq.partnerships) I get:

Caused by: Exception [EclipseLink-6137] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.QueryException
Exception Description: An Exception was thrown while executing a ReportQuery with a constructor expression: java.lang.NoSuchMethodException: de.poyry.pqgenerator.view.PqListItem.<init>(java.lang.Integer, java.lang.String, java.util.Date, java.lang.String, java.lang.String, int)
Query: ReportQuery(referenceClass=Prequalification jpql="SELECT NEW de.poyry.pqgenerator.view.PqListItem(pq.id, pq.name, pq.submissionDate, pe.firstName, pe.lastName, SIZE(pq.partnerships)) FROM Prequalification pq  JOIN pq.user us  JOIN us.person pe  LEFT JOIN pq.partnerships pa  LEFT JOIN pa.company co GROUP BY pq.id")
Default FetchGroup(){id, partnerships, submissionDate, nodes, designSheets, name, statuses, group, user, tendering, isLocked}
    at org.eclipse.persistence.exceptions.QueryException.exceptionWhileUsingConstructorExpression(QueryException.java:494)
    at org.eclipse.persistence.queries.ConstructorReportItem.initialize(ConstructorReportItem.java:188)
    at org.eclipse.persistence.queries.ReportQuery.prepare(ReportQuery.java:1044)
    at org.eclipse.persistence.queries.DatabaseQuery.checkPrepare(DatabaseQuery.java:598)
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.checkPrepare(ObjectLevelReadQuery.java:839)
    at org.eclipse.persistence.queries.DatabaseQuery.prepareCall(DatabaseQuery.java:1719)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:268)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:190)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:142)
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:126)
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1475)
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1497)
    at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createQuery(EntityManagerWrapper.java:468)
    at de.poyry.pqgenerator.service.PqService.findAllPqs(PqService.java:60)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
    at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
    at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5366)
    at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
    at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
    at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
    at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5338)
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5326)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
    ... 106 more

Looks like not autoboxing is occurring? The type of the last constructor param is Integer. Strange, it should work IMO.

Can anyone help please? I’m using EclipseLink 2.3.2 on GlassFish 3.1.1.

How do you correctly determine the number of partnerships from within the query? What does the JPA define here?

Answer 1

The SIZE function is defined in the jpa spec as

functions_returning_numerics::=
    SIZE(collection_valued_path_expression)

collection_valued_path_expression ::=
    general_identification_variable.{single_valued_object_field.}*collection_valued_field

Which means you have to pass the actual property to the SIZE function instead of only the variable name. Can you try the following query instead:

SELECT NEW de.poyry.pqgenerator.view.PqListItem(
 pq.id,
 pq.name,
 pq.submissionDate,
 pe.firstName,
 pe.lastName,
 SIZE(pq.partnerships))
FROM Prequalification pq
 JOIN pq.user us
 JOIN us.person pe
GROUP BY pq.id, pq.name, pq.submissionDate, pe.firstName, pe.lastName

Note that I also removed the joins for pa.company and pq.partnerships since they weren’t used and added the non-aggregate fields to the GROUP BY expression as required by the JPA and SQL standard.

The requirements for the SELECT clause when GROUP BY is used follow those of SQL: namely, any
item that appears in the SELECT clause (other than as an aggregate function or as an argument to an
aggregate function) must also appear in the GROUP BY clause.