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Is there a limit to a class path in a queryDsl query? [duplicate]

java.lang.NullPointerException: while filtering data using QueryDslJava inner class and static nested classError java.lang.OutOfMemoryError: GC overhead limit exceededStatic Classes In JavaWhat is the difference between canonical name, simple name and class name in Java Class?What does “Could not find or load main class” mean?Why is query dsl entity path limited to four levels?Jpa/Hibernate query return wrong result when before it executed other queryQueryDsl web query on the key of a Map fieldFiltering in Spring Data JPA Repository using QueryDSL with a nullable foreign key

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This question already has an answer here:

• 
  java.lang.NullPointerException: while filtering data using QueryDsl
  
  1 answer
  
  

I'm using QueryDSL to build predicates on my java application, and it seems that using a class path that's too big creates a NullPointerException.
Has any of you ever had this problem or is this the normal behavior ?

For example, say I have 5 nested classes (City -> Area -> House -> Room -> Bed) and I want to query if a Bed belongs to a certain Area based on the id of that area.
So I'll build a BooleanExpression with :

public static BooleanExpression areaIdEquals(Long areaId) 
 QBed bed = QBed.bed;
 return bed.room.house.area.id.eq(areaId)

This throws a NullPointerException because apparently, area is always null.

I just want to know if it's common knowledge that there's a limit to a class path size for this kind of query, because I find it weird that the 4th element of my path is always null. I can't find anything about it in the documentation.

java hibernate querydsl

share|improve this question

asked Mar 28 at 14:14

VictorVictor

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marked as duplicate by Mark Rotteveel java
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Apr 2 at 12:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment
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This question already has an answer here:

• 
  java.lang.NullPointerException: while filtering data using QueryDsl
  
  1 answer
  
  

I'm using QueryDSL to build predicates on my java application, and it seems that using a class path that's too big creates a NullPointerException.
Has any of you ever had this problem or is this the normal behavior ?

For example, say I have 5 nested classes (City -> Area -> House -> Room -> Bed) and I want to query if a Bed belongs to a certain Area based on the id of that area.
So I'll build a BooleanExpression with :

public static BooleanExpression areaIdEquals(Long areaId) 
 QBed bed = QBed.bed;
 return bed.room.house.area.id.eq(areaId)

This throws a NullPointerException because apparently, area is always null.

I just want to know if it's common knowledge that there's a limit to a class path size for this kind of query, because I find it weird that the 4th element of my path is always null. I can't find anything about it in the documentation.

java hibernate querydsl

share|improve this question

asked Mar 28 at 14:14

VictorVictor

133 bronze badges

marked as duplicate by Mark Rotteveel java
Users with the  java badge can single-handedly close java questions as duplicates and reopen them as needed.

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Apr 2 at 12:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment
 | 

This question already has an answer here:

• 
  java.lang.NullPointerException: while filtering data using QueryDsl
  
  1 answer
  
  

I'm using QueryDSL to build predicates on my java application, and it seems that using a class path that's too big creates a NullPointerException.
Has any of you ever had this problem or is this the normal behavior ?

For example, say I have 5 nested classes (City -> Area -> House -> Room -> Bed) and I want to query if a Bed belongs to a certain Area based on the id of that area.
So I'll build a BooleanExpression with :

public static BooleanExpression areaIdEquals(Long areaId) 
 QBed bed = QBed.bed;
 return bed.room.house.area.id.eq(areaId)

This throws a NullPointerException because apparently, area is always null.

I just want to know if it's common knowledge that there's a limit to a class path size for this kind of query, because I find it weird that the 4th element of my path is always null. I can't find anything about it in the documentation.

java hibernate querydsl

share|improve this question

asked Mar 28 at 14:14

VictorVictor

133 bronze badges

public static BooleanExpression areaIdEquals(Long areaId) 
 QBed bed = QBed.bed;
 return bed.room.house.area.id.eq(areaId)

share|improve this question

asked Mar 28 at 14:14

VictorVictor

133 bronze badges

share|improve this question

asked Mar 28 at 14:14

VictorVictor

133 bronze badges

asked Mar 28 at 14:14

VictorVictor

133 bronze badges

asked Mar 28 at 14:14

VictorVictor

133 bronze badges

1 Answer
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I found the section of the documentation that explains it.

By default Querydsl initializes only reference properties of the first two levels. In cases where longer initialization paths are required, these have to be annotated in the domain types via com.querydsl.core.annotations.QueryInit annotations. QueryInit is used on properties where deep initializations are needed.

I tested the solution using QueryInit and it works.

share|improve this answer

answered Mar 29 at 5:04

VictorVictor

133 bronze badges

add a comment
 | 

0

I found the section of the documentation that explains it.

By default Querydsl initializes only reference properties of the first two levels. In cases where longer initialization paths are required, these have to be annotated in the domain types via com.querydsl.core.annotations.QueryInit annotations. QueryInit is used on properties where deep initializations are needed.

I tested the solution using QueryInit and it works.

share|improve this answer

answered Mar 29 at 5:04

VictorVictor

133 bronze badges

add a comment
 | 

0

I found the section of the documentation that explains it.

By default Querydsl initializes only reference properties of the first two levels. In cases where longer initialization paths are required, these have to be annotated in the domain types via com.querydsl.core.annotations.QueryInit annotations. QueryInit is used on properties where deep initializations are needed.

I tested the solution using QueryInit and it works.

share|improve this answer

answered Mar 29 at 5:04

VictorVictor

133 bronze badges

add a comment
 | 

I found the section of the documentation that explains it.

By default Querydsl initializes only reference properties of the first two levels. In cases where longer initialization paths are required, these have to be annotated in the domain types via com.querydsl.core.annotations.QueryInit annotations. QueryInit is used on properties where deep initializations are needed.

I tested the solution using QueryInit and it works.

share|improve this answer

answered Mar 29 at 5:04

VictorVictor

133 bronze badges

share|improve this answer

answered Mar 29 at 5:04

VictorVictor

133 bronze badges

answered Mar 29 at 5:04

VictorVictor

133 bronze badges

answered Mar 29 at 5:04

VictorVictor

133 bronze badges