subq.select(b.sum(b.selectCase()
                           .when(b.equal(order_.get(Order_.orderType), OrderSide.BIG)

OrderSide == enum

—

java.lang.NullPointerException: null
at org.hibernate.query.criteria.internal.expression.LiteralExpression.renderProjection(LiteralExpression.java:105)
at org.hibernate.query.criteria.internal.expression.LiteralExpression.render(LiteralExpression.java:52)
at org.hibernate.query.criteria.internal.predicate.ComparisonPredicate.render(ComparisonPredicate.java:172)
at org.hibernate.query.criteria.internal.predicate.AbstractSimplePredicate.render(AbstractSimplePredicate.java:48)
at org.hibernate.query.criteria.internal.expression.SearchedCaseExpression.render(SearchedCaseExpression.java:112)
at org.hibernate.query.criteria.internal.expression.function.ParameterizedFunctionExpression.renderArguments(ParameterizedFunctionExpression.java:121)
at org.hibernate.query.criteria.internal.expression.function.ParameterizedFunctionExpression.render(ParameterizedFunctionExpression.java:109)
at org.hibernate.query.criteria.internal.QueryStructure.renderSelectClause(QueryStructure.java:257)
at org.hibernate.query.criteria.internal.QueryStructure.render(QueryStructure.java:234)
at org.hibernate.query.criteria.internal.CriteriaSubqueryImpl.render(CriteriaSubqueryImpl.java:270)
at org.hibernate.query.criteria.internal.expression.CoalesceExpression.render(CoalesceExpression.java:74)
at org.hibernate.query.criteria.internal.expression.BinaryArithmeticOperation.render(BinaryArithmeticOperation.java:213)
at org.hibernate.query.criteria.internal.expression.function.ParameterizedFunctionExpression.renderArguments(ParameterizedFunctionExpression.java:121)
at org.hibernate.query.criteria.internal.expression.function.ParameterizedFunctionExpression.render(ParameterizedFunctionExpression.java:109)
at org.hibernate.query.criteria.internal.expression.CompoundSelectionImpl.render(CompoundSelectionImpl.java:83)
at org.hibernate.query.criteria.internal.QueryStructure.renderSelectClause(QueryStructure.java:257)
at org.hibernate.query.criteria.internal.QueryStructure.render(QueryStructure.java:234)
at org.hibernate.query.criteria.internal.CriteriaQueryImpl.interpret(CriteriaQueryImpl.java:293)
at org.hibernate.query.criteria.internal.compile.CriteriaCompiler.compile(CriteriaCompiler.java:166)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:3736)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:210)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350)
at com.sun.proxy.$Proxy108.createQuery(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:308)
at com.sun.proxy.$Proxy108.createQuery(Unknown Source)