Martin Desruisseaux created SIS-349:
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Summary: Dead-lock between ContextualParameters and WeakHashSet
Key: SIS-349
URL: https://issues.apache.org/jira/browse/SIS-349
Project: Spatial Information Systems
Issue Type: Bug
Components: Referencing
Affects Versions: 0.7, 0.6
Reporter: Johann Sorel
Assignee: Martin Desruisseaux
Fix For: 0.8
Below are thread-dump of relevant parts. The first parts is in the thread that
verifies if an existing map projection exists in the {{WeakHashSet}}. This
verification implies {{NormalizedProjection}} comparisons, which themselves
imply {{ContextualParameters}} comparisons:
{noformat}
"Thread-3407" #3588 daemon prio=5 os_prio=0 tid=0x00007f7951adf000 nid=0x5836
waiting for monitor entry [0x00007f78744ef000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.sis.referencing.operation.transform.ContextualParameters.equals(ContextualParameters.java:720)
- waiting to lock <0x00000007818ef028> (a
org.apache.sis.referencing.operation.transform.ContextualParameters)
at java.util.Arrays.deepEquals0(Arrays.java:4299)
at java.util.Objects.deepEquals(Objects.java:85)
at org.apache.sis.util.Utilities.deepEquals(Utilities.java:200)
at
org.apache.sis.referencing.operation.transform.AbstractMathTransform.equals(AbstractMathTransform.java:921)
at
org.apache.sis.referencing.operation.projection.NormalizedProjection.equals(NormalizedProjection.java:797)
at org.apache.sis.util.Utilities.deepEquals(Utilities.java:143)
at org.apache.sis.util.Utilities.equals(Utilities.java:238)
at org.apache.sis.util.Utilities.deepEquals(Utilities.java:168)
at
org.apache.sis.referencing.operation.transform.ConcatenatedTransform.equals(ConcatenatedTransform.java:934)
at
org.apache.sis.referencing.operation.transform.AbstractMathTransform.equals(AbstractMathTransform.java:867)
at org.apache.sis.util.collection.WeakHashSet.intern(WeakHashSet.java:315)
at org.apache.sis.util.collection.WeakHashSet.unique(WeakHashSet.java:290)
- locked <0x0000000704b65b40> (a org.apache.sis.util.collection.WeakHashSet)
at
org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.unique(DefaultMathTransformFactory.java:1372)
{noformat}
The second part is in the thread that creates a new map projection, which
implies operations on {{ContextualParameters}}.
{noformat}
"Thread-3409" #3590 daemon prio=5 os_prio=0 tid=0x00007f7824cfd000 nid=0x5838
waiting for monitor entry [0x00007f7819e6e000]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.sis.util.collection.WeakHashSet.unique(WeakHashSet.java:290)
- waiting to lock <0x0000000704b65b40> (a
org.apache.sis.util.collection.WeakHashSet)
at
org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.unique(DefaultMathTransformFactory.java:1372)
at
org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.createConcatenatedTransform(DefaultMathTransformFactory.java:1256)
at
org.apache.sis.referencing.operation.transform.ContextualParameters.completeTransform(ContextualParameters.java:522)
- locked <0x00000007818ef028> (a
org.apache.sis.referencing.operation.transform.ContextualParameters)
at
org.apache.sis.referencing.operation.projection.TransverseMercator.createMapProjection(TransverseMercator.java:301)
at
org.apache.sis.internal.referencing.provider.MapProjection.createMathTransform(MapProjection.java:199)
{noformat}
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