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Ans. Spring is a lightweight framework which gives in-build DI(Dependency injection) and IOC(Inversion of control) features. Where DI is used for injecting one bean into the another bean like Inheritance in Java and IOC is a controller which will control the flow of the bean like bean creation and so on. We will use Bean Factory and Application Context for configuring.
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Ans. Maven provides a facility to have a structure of inheritance relationship between modules / projects through parent tag in POM file. When we try building the parent project , all its child modules are built first in the order specified in the parent POM file.
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Ans. Optimizing Resource utilization. When you open a file using any programming language , that is actually a request to operating system to access the file. When such a request is made , resources are allocated by the OS. When you gracefully close those files, those resources are set free.
In Java if you don’t close the streams and files, Garbage collection identifies the open files which have lost the reference and hence will close them.
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Q1594. If we would like to load just the mapping id for the mapped entity, how can we accomplish that.
For example -
Employee entity is mapped to department entity through department id. We want that when we load employee.getDepartment().getDepartmentId(), it shouldn't load the complete department object but just the Id.
Q1595. If we would like to load just the mapping id for the mapped entity in some cases and whole entity in some cases, because we would like to lazily initialize the dependent entity in some case and not load the entity at all in some case, how can we accomplish that.
For example -
Employee entity is mapped to department entity through department id. We want that when we load employee.getDepartment().getDepartmentId(), it shouldn't load the complete department object but just the Id.
Ans. The error states that Hibernate is not able to initialize proxy / dependent entity objects as there is no session or transaction present. Very likely we are trying to load the dependent entities lazily but the call to dependent object property is not wrapped within the session or transaction.
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Q1597. If you are given choice to avoid LazyInitializationException using any of the following measures, which are the ones you will choose and why ?
1. Set lazy=false in the hibernate config file.
2. Set @Basic(fetch=FetchType.EAGER) at the mapping.
3. Make sure that we are accessing the dependent objects before closing the session.
4. Force initialization using Hibernate.initialize
Ans. Override the behavior of collection class to sort the list upon each element addition. Though it's not recommended as list are sorting heavy data structures.
List<MyType> list = new ArrayList<MyType>() {
public boolean add(MyType mt) {
super.add(mt);
Collections.sort(list, comparator);
return true;
}
};
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