| Sample code:
Set<Long> depts = new HashSet<>();
...
Case<Boolean> selectCase = builder.selectCase();
selectCase.otherwise(false);
selectCase.when(
builder.and(
builder.equal(join.get("actionPartyType"), ActionPartyType.DEPARTMENT),
join.get("actionPartyId").in(depts)
),
true);
...
predicate = builder.and(predicate, {color:red}builder.equal(selectCase, true){color});
query.where(predicate);
It find that CriteriaBuilder.equal will throws NullPointerException, below is the stacktrace
Caused by: java.lang.NullPointerException
at java.lang.Class.isAssignableFrom(Native Method)
at org.hibernate.jpa.criteria.ValueHandlerFactory.isNumeric(ValueHandlerFactory.java:52)
at org.hibernate.jpa.criteria.predicate.ComparisonPredicate.<init>(ComparisonPredicate.java:52)
at org.hibernate.jpa.criteria.CriteriaBuilderImpl.equal(CriteriaBuilderImpl.java:367)
at com.xxx.business.dao.wf.impl.ProcessInstanceDAOImpl$1.prepareQuery(ProcessInstanceDAOImpl.java:116)
at com.xxx.business.dao.wf.impl.ProcessInstanceDAOImpl$1.prepareQuery(ProcessInstanceDAOImpl.java:1)
at com.xxx.business.searching.CriteriaQuerySearch.executeGetRowsCount(CriteriaQuerySearch.java:78)
at com.xxx.business.searching.Search$2.call(Search.java:124)
at com.xxx.business.searching.Search$2.call(Search.java:1)
at com.xxx.business.dao.impl.DataAccessSupportImpl.executeWithTransaction(DataAccessSupportImpl.java:224)
... 166 more
After checking the source code, it suspected that there is a bug in
org.hibernate.jpa.criteria.expression.SearchedCaseExpression
cause the selectCase.getJavaType() always return null. The javaType override logic of SearchedCaseExpression actually do nothing:
private Class<R> javaType;
...
public Case<R> when(Expression<Boolean> condition, Expression<? extends R> result) {
WhenClause whenClause = new WhenClause( condition, result );
whenClauses.add( whenClause );
adjustJavaType( result );
return this;
}
@SuppressWarnings({"unchecked"})
private void adjustJavaType(Expression<? extends R> exp) {
if ( javaType == null ) {
javaType = (Class<R>) exp.getJavaType();
}
}
...
public Expression<R> otherwise(Expression<? extends R> result) {
this.otherwiseResult = result;
adjustJavaType( result );
return this;
}
I think it should call AbstractTupleElement.resetJavaType instead of adjustJavaType |