JPA enum comparison not equal fails

Question

I am using JPA 2.1.2.

I want to execute a select query with a where clause. The where statement should compare (not equal) enums stored in database (string).

@Entity @Table(name = "MY_ENTITY") public class MyEntity implements Serializable {      @Column(name = "REMINDER_STATE")     @Enumerated(EnumType.STRING)     private ReminderStage reminderStage;      ... }  class DaoImpl{  ....      @Override     public List<MyEntity> findAll(ReminderStage stage) {         return em.createQuery("SELECT c FROM MyEntity c  WHERE  c.reminderStage != :reminderStage", MyEntity.class)                 .setParameter("reminderStage", stage).getResultList();      } } 

But when I execute the query I get the following exception:

... [28.07.14 08:27:07:910 CEST] 0000004e SystemErr     R Caused by: <openjpa-2.1.2-SNAPSHOT-r422266:1530146 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: An error occurred while parsing the query filter 'SELECT c FROM CertInfo c  WHERE  c.reminderStage != :reminderStage'. Error message: org.apache.openjpa.kernel.jpql.TokenMgrError: Lexical error at line 1, column 50.  Encountered: "!" (33), after : "" [28.07.14 08:27:07:910 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.parse(JPQLExpressionBuilder.java:2449) [28.07.14 08:27:07:910 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.<init>(JPQLExpressionBuilder.java:2432) [28.07.14 08:27:07:910 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.jpql.JPQLParser.parse(JPQLParser.java:49) [28.07.14 08:27:07:910 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.ExpressionStoreQuery.newCompilation(ExpressionStoreQuery.java:154) [28.07.14 08:27:07:910 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.QueryImpl.newCompilation(QueryImpl.java:672) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.QueryImpl.compilationFromCache(QueryImpl.java:654) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.QueryImpl.compileForCompilation(QueryImpl.java:620) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:682) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at org.apache.openjpa.kernel.QueryImpl.compile(QueryImpl.java:589) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:996) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at com.ibm.ws.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:107) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at com.ibm.ws.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:86) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at com.ibm.ws.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:34) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:974) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at com.ibm.ws.jpa.management.JPATxEmInvocation.createQuery(JPATxEmInvocation.java:353) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at com.ibm.ws.jpa.management.JPAEntityManager.createQuery(JPAEntityManager.java:550) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   at ...findAll(DaoImpl.java:271) [28.07.14 08:27:07:911 CEST] 0000004e SystemErr     R   ... 13 more 

When I change from not equal (!=) to equal (=) the query works fine.

So how can I use enum comparison with not equal?

Answer 1

Not equal ? <> use this operator.

JPQL operators (according to Section 10.2.5.6. of the JPQL Language Reference)

1. Navigation operator (.)
2. Arithmetic operators: +, - unary *, / multiplication and division +, - addition and subtraction
3. Comparison operators: =, >, >=, <, <=, <> (not equal), [ NOT ] BETWEEN, [ NOT ] LIKE, [ NOT ] IN, IS [ NOT ] NULL, IS [ NOT ] EMPTY, [ NOT ] MEMBER [ OF ]
4. Logical operators: NOT AND OR