MAILBOX-350 Avoid closing an already closed CassandraCluster

Nested tests resulted in close being called two times, the second one failing...


Project: http://git-wip-us.apache.org/repos/asf/james-project/repo
Commit: http://git-wip-us.apache.org/repos/asf/james-project/commit/20a7ac44
Tree: http://git-wip-us.apache.org/repos/asf/james-project/tree/20a7ac44
Diff: http://git-wip-us.apache.org/repos/asf/james-project/diff/20a7ac44

Branch: refs/heads/master
Commit: 20a7ac447094dcc97aaa454eb41d180616836e4c
Parents: 1c62cfc
Author: Benoit Tellier <[email protected]>
Authored: Tue Nov 20 15:37:45 2018 +0700
Committer: Benoit Tellier <[email protected]>
Committed: Wed Nov 21 16:40:36 2018 +0700

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 .../org/apache/james/backends/cassandra/CassandraCluster.java  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/james-project/blob/20a7ac44/backends-common/cassandra/src/test/java/org/apache/james/backends/cassandra/CassandraCluster.java
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diff --git 
a/backends-common/cassandra/src/test/java/org/apache/james/backends/cassandra/CassandraCluster.java
 
b/backends-common/cassandra/src/test/java/org/apache/james/backends/cassandra/CassandraCluster.java
index 2db3b16..b6e833f 100644
--- 
a/backends-common/cassandra/src/test/java/org/apache/james/backends/cassandra/CassandraCluster.java
+++ 
b/backends-common/cassandra/src/test/java/org/apache/james/backends/cassandra/CassandraCluster.java
@@ -78,8 +78,10 @@ public final class CassandraCluster implements AutoCloseable 
{
 
     @Override
     public void close() {
-        clearTables();
-        closeCluster();
+        if (!cluster.isClosed()) {
+            clearTables();
+            closeCluster();
+        }
     }
 
     public void closeCluster() {


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