FileSystemBlobStrategy#getFile(ActiveMQBlobMessage) is not thread safe (throws
"java.io.IOException: Unable to create directory")
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Key: JAMES-1327
URL: https://issues.apache.org/jira/browse/JAMES-1327
Project: JAMES Server
Issue Type: Bug
Components: Queue
Affects Versions: 3.0-beta3
Environment: At least Windows and Linux.
Reporter: Michael Herrmann
Consider
org.apache.james.queue.activemq.FileSystemBlobStrategy#getFile(ActiveMQBlobMessage):
protected File getFile(ActiveMQBlobMessage message) throws JMSException,
IOException {
...
// check if we need to create the queue folder
if (queueF.exists() == false) {
if (!queueF.mkdirs()) {
throw new IOException("Unable to create directory " +
queueF.getAbsolutePath());
}
}
...
}
Suppose this method is called from two threads. If both threads get past the
condition
if (queueF.exists() == false),
then the first one will create queueF. For the second, queueF.mkdirs() will
then return false, which leads to an IOException even though everything is
fine. I think the condition should be replaced by
if (!queueF.mkdirs() && !queueF.exists()).
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