Search code examples
javamysqljpaeclipselink

Java JPA - Inner Join Query doesn't work

I'm currently having an issue using Java JPA with EclipseLink - this query:

SELECT  VAR_INPUT.*
FROM VAR_INPUT
INNER JOIN TYPE_VAR_INPUT
ON VAR_INPUT.ID_TYPE_VAR_INPUT = TYPE_VAR_INPUT.ID_TYPE_VAR_INPUT
WHERE TYPE_VAR_INPUT.IS_MANDATORY_TYPE_VAR_INPUT=true;

is working fine when run directly on my database, but doesn't work when I use it with JPA.

JPA Query:

@NamedQuery(name = "VarInput.findAVarInputllOfMandatoryType", 
            query = "SELECT v "
                    + "FROM VarInput v "
                    + "INNER JOIN TypeVarInput t "
                    + "ON v.ID_TYPE_VAR_INPUT = t.ID_TYPE_VAR_INPUT "
                    + "WHERE t.isMandatoryTypeVarInput=:isMandatoryTypeVarInput"),

When I execute it in my Java application, I get the following error: "The field [VAR_INPUT.ID_VAR_INPUT] in this expression has an invalid table in this context."

Exception in thread "AWT-EventQueue-0" Local Exception Stack: 
Exception [EclipseLink-6069] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.QueryException
Exception Description: The field [VAR_INPUT.ID_VAR_INPUT] in this expression has an invalid table in this context.
Query: ReadAllQuery(name="VarInput.findAVarInputllOfMandatoryType" referenceClass=VarInput jpql="SELECT v FROM VarInput v INNER JOIN TypeVarInput t ON v.ID_TYPE_VAR_INPUT = t.ID_TYPE_VAR_INPUT WHERE t.isMandatoryTypeVarInput=:isMandatoryTypeVarInput")
    at org.eclipse.persistence.exceptions.QueryException.invalidTableForFieldInExpression(QueryException.java:749)  at org.eclipse.persistence.exceptions.QueryException.invalidTableForFieldInExpression(QueryException.java:749)
    at org.eclipse.persistence.internal.expressions.FieldExpression.validateNode(FieldExpression.java:296)

My tables looks like that:

Table VAR_INPUT(ID_VAR_INPUT, NAME_VAR_INPUT, ID_TYPE_VAR_INPUT)
Table TYPE_VAR_INPUT(ID_TYPE_VAR_INPUT, NAME_TYPE_VAR_INPUT, IS_MANDATORY_VAR_INPUT)
"VAR_INPUT ManyToOne TYPE_VAR_INPUT"

Do you have any idea of why this happens?

NB: The Entities were generated by NetBeans

Solution

  • You don't use inner join in JQPL like that, you join on entity fields. I'm guessing now since you didn't provide entity code, but try this

    @NamedQuery(name = "VarInput.findAVarInputllOfMandatoryType", 
            query = "SELECT v "
                    + "FROM VarInput v "
                    + "join v.type t "
                    + "WHERE t.isMandatoryTypeVarInput=:isMandatoryTypeVarInput")

    In this case you don't even need to join, you can simplify the query to this (inner join is implicitly used)

    @NamedQuery(name = "VarInput.findAVarInputllOfMandatoryType", 
            query = "SELECT v "
                    + "FROM VarInput v "
                    + "WHERE v.type.isMandatoryTypeVarInput=:isMandatoryTypeVarInput")