java.lang.IllegalMonitorStateException: unlock of unowned monitor at java.util.Random.nextGaussian(Random.java:187)


walkur
HOME ยป Java

While calling inbuilt method nextGaussian throws an IllegalMonitorStateException: unlock of unowned monitor


double dispersion = RAND.nextGaussian() * 0.2;

which is inside


@Override
public void stroke(Canvas c, float x, float y) {
}

which is called here


case MotionEvent.ACTION_MOVE:
style.stroke(mCanvas, x, y);
break;
}
return true;
}

then in Surface.java


@Override
publi

Related to : java.lang.IllegalMonitorStateException: unlock of unowned monitor at java.util.Random.nextGaussian(Random.java:187)
java.lang.IllegalMonitorStateException: unlock of unowned monitor at java.util.Random.nextGaussian(Random.java:187)
Java

While calling inbuilt method nextGaussian throws an IllegalMonitorStateException: unlock of unowned monitor


double dispersion = RAND.nextGaussian() * 0.2;

which is inside


@Override
public void stroke(Canvas c, float x, float y) {
}

which is called here


case MotionEvent.ACTION_MOVE:
style.stroke(mCanvas, x, y);
break;
}
return true;
}

then in Surface.java


@Override
publi
Exception in thread “Thread-8” java.lang.StackOverflowError…at java.util.Random.nextInt(Unknown Source)
Java

Exception in thread "Thread-8" java.lang.StackOverflowError
at sun.misc.Unsafe.compareAndSwapLong(Native Method)
at java.util.concurrent.atomic.AtomicLong.compareAndSet(Unknown Source)
at java.util.Random.next(Unknown Source)
at java.util.Random.nextInt(Unknown Source)
at sim.ant.colony.ants.Forager.moveTo(Forager.java:108)

I'm working with a multi threaded application(Ant Simulation Colony) where I created every ant as a thread and when tens of threads (ants) are running, above exception occurs after every few turns and thread is killed. code where I'm using Random() is;


Random r
Gradle - Execution failed for task 'sonarAnalyze' - java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String
Java

I have this error when running sonar with my gradle build script.


gradle sonarAnalyze


15:41:02.931 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception.
15:41:02.931 [ERROR] [org.gradle.BuildExceptionReporter]
15:41:02.931 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong:
15:41:02.931 [ERROR] [org.gradle.BuildExceptionReporter] Execution failed for task ':sonarAnalyze'.
15:41:02.934 [ERROR] [org.gradle.BuildExceptionReporter] > java.util.ArrayList cannot be cast to java.lang.String
My sonar
sonar {
server {

java.lang.IllegalMonitorStateException: (m=null) Failed to get monitor for
Java

Why may this happen? The thing is that monitor object is not null for sure, but still we get this exception quite often:


java.lang.IllegalMonitorStateException: (m=null) Failed to get monitor for (tIdx=60)
at java.lang.Object.wait(Object.java:474)
at ...

The code that provokes this is a simple pool solution:


public Object takeObject() {
Object obj = internalTakeObject();
while (obj == null) {
try {
available.wait();
} catch (InterruptedException e) {
throw new RuntimeException


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