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Search found 81 results on 4 pages for 'eugenep'.

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• A typical lifecycle of a Hibernate object in a web app - ?

  - by EugeneP

  Describe please a typical lifecycle of a Hibernate object (that maps to a db table) in a web app. Suppose, you create a new instance of an object and persist in the db. But during the app lifetime you'll be working on a detached object and finally you need to update it in the database, for example on exit. How does it look like with hibernate and spring? p.s. Can transactions and sessions live between servlet transitions? So that we opened 1 session and use it in all servlets without a need to reopen it?

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• In servlet (web app) how do I know the relative path ?

  - by EugeneP

  I have a jsp file in the root of .war file. and then I have a folder named STUFF. How do I get access to the file read.txt inside STUFF? /Name_of_war/STUFF/read.txt is the correct path?

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• How to let Spring initialize "prototype" beans only when it is got through getBean()?

  - by EugeneP

  I see that it initializes prototype beans on initial startup. How to prevent this ?

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• for (Object object : list) [java] and index element

  - by EugeneP

  Is there a way to get an element id of a list to get it later through list.get(index) when using for(Object obj: o) construction Only define a local var and manually incrementing it? Anything simpler?

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• 1:M relationship in Hibernate and cascading operations

  - by EugeneP

  Table SUBCOURSE references COURSE COURSE(id, name) SUBCOURSE(id, course_id, name) So, 1:M. Hibernate generates for Course: @OneToMany(fetch = FetchType.LAZY, mappedBy = "course", cascade = CascadeType.ALL) public Set getSubCourses() { return this.subCourses; } for Subcourse it generates @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "course_id", nullable = false) public Course getCourse() { return this.course; } Now the problem is that cascading does not work as expected. I want to create a collection of SubCourse objects (Set), fill it and then bind it to setSubCourses() of Course object. Though, having ManyToOne thing in a Subcourses table, I need to manually setCourse() before adding to collection on each object. If I do not do so, an exception is raised. What can you recommend me?

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• what to do so that spring initialized "prototype" beans only when it is got thru getBean()

  - by EugeneP

  I see that it initializes prototype beans on initial startup. How to prevent this ?

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