인프런 커뮤니티 질문&답변

강의 7분16초에서

List<Tuple> result = queryFactory
.select(QTeam.team.name, QMember.member.age.avg())
.from(QMember.member)
.join(QMember.member.team, QTeam.team)
.groupBy(QTeam.team.name)
.fetch();

위 코드로 하면 성공하지만

List<Tuple> result = queryFactory
.select(QTeam.team.name, QMember.member.age.avg())
.from(QTeam.team)
.join(QMember.member.team, QTeam.team)
.groupBy(QTeam.team.name)
.fetch();

이렇게 코드를 작성하면 맨아래와 같은 에러가 발생합니다.

하지만 제가 H2에서 위 코드를 SQL로 바꾸면 아래와 같이 된다고 생각해서

select t.NAME, AVG(m.AGE)

from Team t join Member m on m.TEAM_ID=t.ID group by t.NAME;

이렇게 적어서 실행해보니

원하는 결과대로 잘 나오긴하는데 왜 Querydsl에서는 이러한 에러가 발생하는지 궁금합니다.

========================================org.hibernate.hql.internal.ast.InvalidPathException: Invalid path: 'member1.team'

at org.hibernate.hql.internal.ast.util.LiteralProcessor.lookupConstant(LiteralProcessor.java:111) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.tree.DotNode.resolve(DotNode.java:218) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:114) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:109) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:411) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:4007) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3793) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3671) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:746) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:602) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:339) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:287) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:276) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:192) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:144) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:113) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:73) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:162) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:636) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:748) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:114) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]

at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]

at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311) ~[spring-orm-5.3.22.jar:5.3.22]

at com.sun.proxy.$Proxy113.createQuery(Unknown Source) ~[na:na]

at com.querydsl.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:132) ~[querydsl-jpa-5.0.0.jar:na]

at com.querydsl.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:125) ~[querydsl-jpa-5.0.0.jar:na]

at com.querydsl.jpa.impl.AbstractJPAQuery.fetch(AbstractJPAQuery.java:242) ~[querydsl-jpa-5.0.0.jar:na]

at study.querydsl.QuerydslbasicTest.group(QuerydslbasicTest.java:215) ~[classes/:na]

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]

at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]

at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725) ~[junit-platform-commons-1.8.2.jar:1.8.2]

at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:214) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:210) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:135) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:66) ~[junit-jupiter-engine-5.8.2.jar:5.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na]

at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.8.2.jar:1.8.2]

at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na]