Hi Brian,
The Android library is supposed to be thread-safe. Your stack trace
doesn't really provide a hint how this is OpenCMIS related.
ObjectType objects are read-only. They are created and never change. I
would be surprised if there is a threading issue.
There has been a race condition in a different place (CMIS-769 [1]),
which has been fixed in 0.11.0.
If you can, please upgrade to 0.12.0. It's easier for us to locate
issues in the last version.
- Florian
[1] https://issues.apache.org/jira/browse/CMIS-769
Hi,
We are using the Android client library (OpenCMIS version 0.10.0) to
develop a CMIS Consumer App. If a user uses the App to upload a
document and, while the upload is progressing, views another object's
properties, the App sometimes crashes with a
java.util.ConcurrentModificationException. We believe it is caused by
multiple threads accessing
org.apache.chemistry.opencmis.client.api.ObjectType. Is this because
the class is not thread-safe? Is there anything we can do to protect
our App from this exception while being able to access the library
from multiple threads? Would upgrading to version 0.11 or 0.12 help?
10-01 22:44:45.981: E/AndroidRuntime(27060): FATAL EXCEPTION: main
10-01 22:44:45.981: E/AndroidRuntime(27060):
java.util.ConcurrentModificationException
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:347)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:376)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:374)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.util.HashMap.writeObject(HashMap.java:993)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.lang.reflect.Method.invokeNative(Native Method)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.lang.reflect.Method.invoke(Method.java:525)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1053)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.util.HashMap.writeObject(HashMap.java:995)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.lang.reflect.Method.invokeNative(Native Method)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.lang.reflect.Method.invoke(Method.java:525)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1053)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.util.HashMap.writeObject(HashMap.java:995)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.lang.reflect.Method.invokeNative(Native Method)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.lang.reflect.Method.invoke(Method.java:525)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1053)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
10-01 22:44:45.981: E/AndroidRuntime(27060): at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
...
... Brian ...
