Hibernate - .ast.QuerySyntaxException: unexpected AST node error?

My JPQL Query is as below -

@Query("SELECT p.packageName FROM Packages p WHERE CASE WHEN p.packageId.packageId IS NULL THEN TRUE WHEN p.packageId.packageId=:packageId THEN TRUE ELSE FALSE END")
List<String> getPackageByAccountIdAndPackageId(Long packageId);

I am facing below error on compiling the above code -

Caused by: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: CASE near line 1, column 80 [SELECT p.packageName FROM com.entities.Packages p WHERE CASE WHEN p.packageId.packageId IS NULL THEN TRUE WHEN p.packageId.packageId=:packageId THEN TRUE ELSE FALSE END]
	at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:138) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
	at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
	at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
	at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:729) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
	at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:104) ~[hibernate-core-5.3.10.Final.jar:5.3.10.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.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	at com.sun.proxy.$Proxy137.createQuery(Unknown Source) ~[na:na]
	at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:87) ~[spring-data-jpa-2.1.10.RELEASE.jar:2.1.10.RELEASE]
	... 58 common frames omitted
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected AST node: CASE near line 1, column 80 [SELECT p.packageName FROM com.entities.Packages p WHERE CASE WHEN p.packageId.packageId IS NULL THEN TRUE WHEN p.packageId.packageId=:packageId THEN TRUE ELSE FALSE END]
	at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:74) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
	at org.hibernate.hql.internal.ast.ErrorTracker.throwQueryException(ErrorTracker.java:93) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:277) ~[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]
	... 66 common frames omitted

Any guidance/help on how to resolve this will be greatly appreciated.

I am using spring-data-jpa - 2.1.7.RELEASE and hibernate core - 5.3.10.FINAL

That kind of predicate is simply not supported. Just use it like this:

SELECT p.packageName 
FROM Packages p 
WHERE p.packageId.packageId IS NULL 
OR p.packageId.packageId=:packageId