Java java.util.ConcurrentModificationException error
- by vijay
Hi all, please can anybody help me solve this problem last so many days I could not able to solve this error. I tried using synchronized method and other ways but did not work so please help me
Error
java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
at java.util.AbstractList$Itr.remove(Unknown Source)
at JCA.startAnalysis(JCA.java:103)
at PrgMain2.doPost(PrgMain2.java:235)
Code
public synchronized void startAnalysis() {
//set Starting centroid positions - Start of Step 1
setInitialCentroids();
Iterator<DataPoint> n = mDataPoints.iterator();
//assign DataPoint to clusters
loop1:
while (true) {
for (Cluster c : clusters)
{
c.addDataPoint(n.next());
if (!n.hasNext())
break loop1;
}
}
//calculate E for all the clusters
calcSWCSS();
//recalculate Cluster centroids - Start of Step 2
for (Cluster c : clusters) {
c.getCentroid().calcCentroid();
}
//recalculate E for all the clusters
calcSWCSS();
// List copy = new ArrayList(originalList);
//synchronized (c) {
for (int i = 0; i < miter; i++) {
//enter the loop for cluster 1
for (Cluster c : clusters) {
for (Iterator<DataPoint> k = c.getDataPoints().iterator(); k.hasNext(); ) {
// synchronized (k) {
DataPoint dp = k.next();
System.out.println("Value of DP" +dp);
//pick the first element of the first cluster
//get the current Euclidean distance
double tempEuDt = dp.getCurrentEuDt();
Cluster tempCluster = null;
boolean matchFoundFlag = false;
//call testEuclidean distance for all clusters
for (Cluster d : clusters) {
//if testEuclidean < currentEuclidean then
if (tempEuDt > dp.testEuclideanDistance(d.getCentroid())) {
tempEuDt = dp.testEuclideanDistance(d.getCentroid());
tempCluster = d;
matchFoundFlag = true;
}
//if statement - Check whether the Last EuDt is > Present EuDt
}
//for variable 'd' - Looping between different Clusters for matching a Data Point.
//add DataPoint to the cluster and calcSWCSS
if (matchFoundFlag) {
tempCluster.addDataPoint(dp);
//k.notify();
// if(k.hasNext())
k.remove();
for (Cluster d : clusters) {
d.getCentroid().calcCentroid();
}
//for variable 'd' - Recalculating centroids for all Clusters
calcSWCSS();
}
//if statement - A Data Point is eligible for transfer between Clusters.
// }// syn
}
//for variable 'k' - Looping through all Data Points of the current Cluster.
}//for variable 'c' - Looping through all the Clusters.
}//for variable 'i' - Number of iterations.
// syn
}
