Calling Methods on an Object

Calling Methods On An Object

The illegalmonitorstateexception error is brought on if the thread tries to name the strategies on an object with out buying the article’s lock. Methods are used for inter-thread communication.Calling Methods On An Object

You will be taught the causes of the error intimately and how one can remedy them with the assistance of an knowledgeable’s recommendation. Keep studying to achieve a greater understanding.

Why Do I Get Illegalmonitorstateexception?

You get Illegalmonitorstateexception when the thread tries to name the strategies like wait(), notify(), notifyAll(), unlock(), and the NewCondition() methodology. In the case of the wait() methodology, if you don’t name it from the synchronized blocks, then you’ll encounter this error in your program.

For two threads to speak with one another or inter-thread communication, threads should use the strategies. The thread class inherits these strategies from the article class. Hence, a thread wants to amass the article’s lock to name the given strategies on that object. Let’s focus on what these strategies are and the way you’ll face the illegalmonitorstateexception error in java with the assistance of code examples.

– Wait() Method

If the strategy referred to as wait() has been referred to as by the thread however not from synchronized blocks or the synchronized methodology, then at runtime, you’ll face the error that claims illegalmonitorstateexception. The code instance has been given under that can assist you correctly perceive the illegalmonitorstateexception wait error.

class MyRunnable implements Runnable {

public void run() {

System.out.println(“MyRunnable,in run() method”);

strive {

this.wait(1000); // calling wait() with out buying object lock

// throws UnlawfulMonitorStateException

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(“Thread in runnable state after 1000 millisecs”);

}

}

public class UnlawfulMonitorStateExceptionInstanceUsingWait {

public static void primary(String[] args) {

MyRunnable myRunnable=new MyRunnable();

Thread thread1=new Thread(myRunnable,”Thread-1″);

thread1.begin();

}

}

You will encounter the error under in the event you try to execute the code above.

MyRunnable,in run() methodology

Exception in thread “Thread-1” java.lang.UnlawfulMonitorStateException

at java.lang.Object.wait(Native Method)

at MyRunnable.run(UnlawfulMonitorStateExceptionInstanceUsingWait.java:5)

at java.lang.Thread.run(Unknown Source)

– Notify() And Notifyall() Methods

You may face the error if the notify() or notifyAll() strategies are not referred to as from the synchronized block or synchronized methodology. If that’s the downside along with your code, then that is precisely why you might be going through the error that claims illegalmonitorstateexception.1674500327 870 Calling Methods On An Object

– Unlock() Method

If the present thread just isn’t holding the lock, and it calls the unlock() strategies, then you’ll be confronted with the error that claims illegalmonitorstateexception. The instance code is given under that can assist you perceive the illegalmonitorstateexception lock error higher.

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import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

public class UnlawfulMonitorStateExceptionInstanceUsingLock {

public static void primary(String[] args) {

closing Lock lock = new ReentrantLock();

new Thread(new Runnable() {

public void run() {

System.out.println(“Thread-1 is Waiting to acquire lock”);

//lock.lock();

lock.unlock(); // It will throw UnlawfulMonitorStateException

}

}, “Thread-1”) {

}.begin();

}

}

In the case of such a code given above, you’ll face the error illegalmonitorstateexception. Let us check out the output of that code.

Exception in thread “Thread-1” Thread-1 is Waiting to amass lock

java.lang.UnlawfulMonitorStateException

at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(Unknown Source)

at java.util.concurrent.locks.AbstractQueuedSynchronizer.launch(Unknown Source)

at java.util.concurrent.locks.ReentrantLock.unlock(Unknown Source)

at UnlawfulMonitorStateExceptionInstanceUsingLock$1.run(AvoidIllegalMonitorStateExceptionInstanceUsingLock.java:14)

at java.lang.Thread.run(Unknown Source)

– Newcondition Method()

The ReEntrantLock’s methodology, named as newCondition methodology, also can throw the error illegalmonitorstateexception. The methodology returns a situation occasion for use with the Lock occasion. Using the situation situations are similar as utilizing the notify(), notifyAll(), and wait() strategies.

If the lock just isn’t held when any situation ready or signaling strategies are referred to as, you may face the illegalmonitorstateexception reentrantlock error.

How Do I Fix Illegalmonitorstateexception?

To repair the illegalmonitorstateexception error, you have to name wait() from synchronized blocks or the synchronized methodology, name notify() and notifyall() from synchronized blocks or the synchronized methodology, name lock () earlier than you name Unlock(), and test if the lock Is held when strategies are referred to as.

We will now focus on all of the options to the causes talked about within the earlier part. Keep studying to know the options with the assistance of code examples.

– Call Wait() From Synchronized Blocks or the Synchronized Method

The solely means you may remedy the error downside is earlier than you strive calling the wait() methodology; you have to be sure that the thread ought to personal lock on the article’s monitor. It implies that the strategy wait() should be referred to as from synchronized blocks or the synchronized methodology. That will resolve the error downside for you. Take a take a look at the code instance given under to know it higher.

class MyRunnable implements Runnable {

public void run() {

synchronized (this) {

System.out.println(“MyRunnable,in run() method”);

strive {

this.wait(1000); // calling wait() by buying object lock doesn’t

// throws UnlawfulMonitorStateException

System.out

.println(“Thread in runnable state after 1000 millisecs”);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

public class AvoidIllegalMonitorStateExceptionInstanceUsingWait {

public static void primary(String[] args) {

MyRunnable myRunnable=new MyRunnable();

Thread thread1=new Thread(myRunnable,”Thread-1″);

thread1.begin();

}

}

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You can see within the instance given above that the error was resolved by calling the wait() from the synchronized block. You can examine the code in the issue and the answer to know higher. The output of the resolved code appears to be like like the next.

MyRunnable,in run() methodology

Thread in runnable state after 1000 millisecs.

– Call Notify() And Notifyall() From Synchronized Blocks

Just just like the wait() methodology, It is crucial that earlier than you name the notify() or notifyAll() strategies, the thread should personal the lock on the article’s monitor. Hence, it’s essential to all the time name the notify() and notifyAll() from synchronized blocks or the synchronized methodology. That will assist you resolve the error in case you forgot to do as said.1674500329 891 Calling Methods On An Object

– Call Lock() Before You Call Unlock()

To resolve the error downside within the code instance, previous to calling the unlock methodology (), it’s essential to first name the lock methodology () on the present thread. By doing that, your error illegalmonitorstateexception might be resolved. Let us take a look at the code to see how the error is resolved by calling the lock () methodology earlier than the unlock() methodology.

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

public class AvoidIllegalMonitorStateExceptionInstanceUsingLock {

public static void primary(String[] args) {

closing Lock lock = new ReentrantLock();

new Thread(new Runnable() {

public void run() {

System.out.println(“Thread-1 is Waiting to acquire lock”);

lock.lock();

System.out.println(“Thread-1 has acquired lock.”);

lock.unlock();

System.out.println(“Thread-1 has released lock.”);

}

}, “Thread-1”) {

}.begin();

Note that the code has been modified barely by calling the lock () methodology earlier than the unlock() methodology. Now check out the output.

Thread-1 is Waiting to amass lock

Thread-1 has acquired lock.

Thread-1 is about to launch lock.

You can see that the error illegalmonitorstateexception unlock has been resolved efficiently within the output.

– Check if the Lock Is Held When Methods Are Called

If you need to resolve the illegalmonitorstateexception thrown by the newCondition() methodology, you have to test if the lock is held when the situation ready or signaling strategies are referred to as. Make certain that the above situation is fulfilled. If it’s, you’ll not face this annoying error once more.

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FAQs

1. Why Do I See Illegalmonitorstateexception: Current Thread Is Not Owner

You see Illegalmonitorstateexception: Current Thread Is Not Owner whenever you attempt to wait on the net aspect. The methodology wait(n) causes the thread to attend for the n variety of seconds, so you will need to be certain that one other thread just isn’t utilizing the net aspect.

If you need to be certain that the net aspect object is accessed just one thread at a time, you have to enclose WebElement.wai() in a synchronized block.

2. What Is java.lang.illegalmonitorstateexception Selenium?

The java.lang.illegalmonitorstateexception error is thrown as an indication {that a} thread tried to attend on the article’s monitor or notify the opposite threads ready on the article’s monitor with out proudly owning the monitor specified. The open-source Selenium device provides a single interface which will assist you create check scripts.

3. What Is The Function of Object Monitor in Java?

The perform of object monitor in Java is to management the concurrent entry of a way in an object. If any concurrent threads name a way concurrently, then just one thread can execute this methodology. The monitor object doesn’t have its thread of management in comparison with the lively object.

Conclusion

All the potential causes of the error have been mentioned, together with their potential options. Let us now summarize the article into important factors so that you can bear in mind.

  • The illegalmonitorstateexception is a standard java error. You will see this error if the thread tries to name the strategies on an object with out buying the article’s lock.
  • A thread wants to amass the article’s lock to name the strategies on that object.
  • For two threads to speak with one another or inter-thread communication, threads should use the strategies referred to as notify(), notifyAll(), and wait().
  • A monitor object sample is used to handle concurrent entry to a way in an object.
  • If some concurrent threads name a way concurrently, then just one thread can execute this methodology.

In this text, you might have realized all the main points in regards to the causes for the error illegalmonitorstateexception. You can all the time seek advice from this text in case you face the identical error once more or have any questions relating to the subject.

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