如何解决构建 querydsl 时来自 HqlSqlWalker 的 NullPointerException
我有一个项目列表，它具有搜索表单，可通过插入标签和生成的 JPQL 查询来过滤结果以根据需要过滤项目。
我的类“项目”：
@Column(name = "tag_ids")
@Convert(converter = StringConverter.class)
private Set<String> tags= new HashSet<>();
我的 JPQLQuery“项目”
JPQLQuery<Item> query = from(entityPath());
BooleanBuilder booleanBuilder = new BooleanBuilder();
if (!CollectionUtils.isEmpty(searchCriteria.getTagIds()))
{
booleanBuilder.and(QItem.item.tags.any().in(searchCriteria.getTagIds());
}
return query.where(booleanBuilder);
我得到了 NPE
java.lang.NullPointerException: null
at org.hibernate.hql.internal.ast.tree.MethodNode.handleElements(MethodNode.java:200) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.ast.tree.MethodNode.resolveCollectionProperty(MethodNode.java:146) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.ast.tree.CollectionFunction.resolve(CollectionFunction.java:26) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.ast.HqlsqlWalker.processFunction(HqlsqlWalker.java:1227) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.collectionFunction(HqlsqlbaseWalker.java:3047) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.collectionFunctionorSubselect(HqlsqlbaseWalker.java:4919) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.inRhs(HqlsqlbaseWalker.java:4828) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.comparisonExpr(HqlsqlbaseWalker.java:4491) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2138) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2066) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2063) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2063) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.whereClause(HqlsqlbaseWalker.java:815) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.query(HqlsqlbaseWalker.java:609) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.selectStatement(HqlsqlbaseWalker.java:313) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.statement(HqlsqlbaseWalker.java:261) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:271) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:191) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:143) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:119) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:153) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:611) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.internal.AbstractSharedSessionContract.createquery(AbstractSharedSessionContract.java:720) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.internal.AbstractSessionImpl.createquery(AbstractSessionImpl.java:23) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at sun.reflect.GeneratedMethodAccessor67.invoke(UnkNown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350) ~[spring-orm-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at com.sun.proxy.$Proxy140.createquery(UnkNown Source) ~[na:na]
at sun.reflect.GeneratedMethodAccessor67.invoke(UnkNown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:308) ~[spring-orm-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at com.sun.proxy.$Proxy140.createquery(UnkNown Source) ~[na:na]
at com.querydsl.jpa.impl.AbstractJPAQuery.createquery(AbstractJPAQuery.java:101) ~[querydsl-jpa-4.4.0.jar:na]
at com.querydsl.jpa.impl.AbstractJPAQuery.createquery(AbstractJPAQuery.java:94) ~[querydsl-jpa-4.4.0.jar:na]
at com.querydsl.jpa.impl.AbstractJPAQuery.fetch(AbstractJPAQuery.java:201) ~[querydsl-jpa-4.4.0.jar:na]
at com.projet.halowa.persistence.repositories.impl.ItemJpaRepositoryImpl.findAll(ItemJpaRepositoryImpl.java:59) ~[halowa-persistence-3.5.11-SNAPSHOT.jar:na]
at com.projet.halowa.persistence.repositories.impl.ItemJpaRepositoryImpl$$FastClassBySpringcglib$$a4980ac2.invoke(<generated>) ~[halowa-persistence-3.5.11-SNAPSHOT.jar:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) [spring-core-5.1.7.RELEASE.jar:5.1.7.RELEASE]
对这个问题有什么想法！！ ，提前谢谢你
解决方法
HQL 不支持属性转换器上的 IN 运算符。如果您想查询它，您应该只为您的字段使用 @EmbeddedCollection。属性转换器仅适用于水合实体。
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