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


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

I'm currently having a problem to iterate over a collection. When I
declare the fields and constructor and try to enter my method to
iterate over the collection and print out the elements, it comes up
with the following error.


incompatible types - found
java.util.Iterator(Lot) but expected java.util.Iterator
(java.lang.String)


Here is my code.


public
class Auction
{
// The list of Lots in this auction. />private ArrayList<Lot> lots;
// The number that will be
given to the next lot entered
// into this auction.
private
int nextLotNumber;
/**
* Create a new auction.
Java

I have a jrxml file. When I run that file in
IReport Designer 4.8.0, Produces report without fail. />But when I deploy the same file in JasperServer 5.0.0,
it throws exception.


The server has encountered an
error. Please excuse the inconvenience.
Error Message />java.lang.ClassCastException: java.util.Date cannot be cast to
java.sql.Timestamp
Error Trace
java.lang.ClassCastException:
java.util.Date cannot be cast to java.sql.Timestamp at
net.sf.jasperreports.engine.query.JRJdbcQueryExecuter.setTimestamp(JRJdbcQueryExecuter.java:605)
at
net.sf.jasperreports.engine.query.JRJdbcQue
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
Development Tools & Services

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
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
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

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