Is HttpSession thread-safe?

The Developer has the responsibility for threadsafe access to the attribute objects themselves. This will protect the attribute collection inside the HttpSession object from concurrent access, eliminating the opportunity for an application to cause that collection to become corrupted.

How do I make thread-safe without synchronized?

Actually, lots of ways:

1. No need for synchronization at all if you don’t have mutable state.
2. No need for synchronization if the mutable state is confined to a single thread. This can be done by using local variables or java. lang. ThreadLocal .
3. You can also use built-in synchronizers. java. util. concurrent. locks.

Why is thread synchronization required?

Thread synchronization is the concurrent execution of two or more threads that share critical resources. Threads should be synchronized to avoid critical resource use conflicts. Otherwise, conflicts may arise when parallel-running threads attempt to modify a common variable at the same time.

Is immutable thread-safe?

To put it simply, a class instance is immutable when its internal state can’t be modified after it has been constructed. A MessageService object is effectively immutable since its state can’t change after its construction. Hence, it’s thread-safe.

Is hibernate thread-safe?

Hibernate sessions are not thread-safe. Not only does this mean you shouldn’t pass a Hibernate session into a new thread, it also means that because objects you load from a session can be called from (and call back to) their owning session, you must not share Hibernate-managed objects between threads.

Can I reuse the session in hibernate?

So, how can i reuse an Hibernate Session, in the same thread, that has been previously closed? Either use the built-in ” managed ” strategy (set the current_session_context_class property to managed ) or use a custom CurrentSessionContext derived from ThreadLocalSessionContext and override ThreadLocalSessionContet.

What is thread safe and non thread safe?

Conditionally safe: Different threads can access different objects simultaneously, and access to shared data is protected from race conditions. Not thread safe: Data structures should not be accessed simultaneously by different threads.

What is thread safe or synchronized?

Thread safe means that a method or class instance can be used by multiple threads at the same time without any problems occurring. Where as Synchronized means only one thread can operate at single time.

Which of the following are thread safe?

Answer: Since String is immutable in Java, it’s inherently thread-safe. 2) Read-only or final variables in Java are also thread-safe in Java. 5) Example of thread-safe class in Java: Vector, Hashtable, ConcurrentHashMap, String, etc.

Is mutable thread safe?

3 Answers. You are correct, mutable objects are not thread safe because multiple threads can write to that data at the same time. This is in contrast to reading data, an operation multiple threads can do simultaneously without causing problems. Immutable types can only be read.

Is it better to run one thread or multithread on one task?

When the ratio Overhead / Execution Time is greater than P/2, a single thread is faster. MultiThreading on Single Core CPU : 1.1 When to use : Multithreading helps when tasks that needs parallelism are IO bound. Sequential execution do not have the behavior – Multithreads will boost the performance.

Is spring HttpSession thread safe?

What you get wired from Spring is just the HttpSession. There are no special thread safety guarantees. Implementations using HttpSession are not necessarily thread safe. See also this question: Is HttpSession thread safe, are set/get Attribute thread safe operations?

Is session thread safe in servlet?

The session is not thread safe and neither the get not the set methods are guaranteed to be thread safe. In general in a servlet container you should assume to be in a multi threaded environment and no provided tooling is safe.

Can two threads access the same session at the same time?

As Eddie points out, one situation where you may face two thread accessing the same session is two ajax calls are attempting to modify the same session attribute. Otherwise you won’t have problems. The session is not thread safe and neither the get not the set methods are guaranteed to be thread safe.

Who is responsible for threadsafe access to session attributes?

The container must ensure that manipulation of internal data structures representing the session attributes is performed in a threadsafe manner. The Developer has the responsibility for threadsafe access to the attribute objects themselves.