Concurrency issue in gml/xml parsing
------------------------------------
Key: GEOT-2615
URL: http://jira.codehaus.org/browse/GEOT-2615
Project: GeoTools
Issue Type: Bug
Components: core xml
Affects Versions: 2.5.5
Reporter: Niklas Eklund
GML parsing with gtxml (2.5.5) intermittently fails in a multi-threaded
environment with exceptions similar to:
java.lang.ArrayIndexOutOfBoundsException: 194
at org.eclipse.emf.common.util.BasicEList.indexOf(BasicEList.java:373)
at org.eclipse.emf.common.util.BasicEList.remove(BasicEList.java:866)
at
org.eclipse.emf.common.notify.impl.BasicNotifierImpl$EAdapterList.remove(BasicNotifierImpl.java:137)
at
org.geotools.xml.impl.SchemaIndexImpl.destroy(SchemaIndexImpl.java:97)
at
org.geotools.xml.impl.ParserHandler.endDocument(ParserHandler.java:603)
...
The exceptions change but are always in SchemaIndexImpl + BasicEList so this
could either be a bug in emf or how emf classes are used by SchemaIndexImpl.
This code snippet triggers the error on my machine:
final String gml = "<gml:Point srsName=\"EPSG:4326\"
xmlns:gml=\"http://www.opengis.net/gml\";><gml:coordinates cs=\",\"
decimal=\".\" ts=\"
\">11.9119821266414,57.6756639706692</gml:coordinates></gml:Point>";
final int tCount = 2;
final int nIter = 1000;
Thread[] threads = new Thread[tCount];
for (int i = 0; i < tCount; ++i) {
Thread t = new Thread() {
@Override
public void run() {
for (int i = 0; i < nIter; ++i) {
try {
final Configuration
configuration = new GMLConfiguration();
final Parser parser =
new Parser(configuration);
parser.parse(new
StringReader(gml));
} catch (Throwable t) {
t.printStackTrace();
}
}
}
};
threads[i] = t;
t.start();
}
for (int i = 0; i < tCount; ++i) {
try {
threads[i].join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
If the call to parser.parse is serialized/synchronized so that only one thread
can parse at once, no errors seem to appear.
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