add checks when server closes idle connections

src/main/java/redis/clients/util/RedisInputStream.java

@@ -16,9 +16,11 @@
 
 package redis.clients.util;
 
-import redis.clients.jedis.JedisException;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
 
-import java.io.*;
+import redis.clients.jedis.JedisException;
 
 public class RedisInputStream extends FilterInputStream {
 
@@ -83,7 +85,12 @@ public class RedisInputStream extends FilterInputStream {
         } catch (IOException e) {
             throw new JedisException(e);
         }
-        return sb.toString();
+        String reply = sb.toString();
+        if (reply.isEmpty()) {
+            throw new JedisException(
+                    "It seems like server has closed the connection.");
+        }
+        return reply;
     }
 
     @Override

src/test/java/redis/clients/jedis/tests/JedisTest.java

@@ -6,6 +6,7 @@ import java.util.Map;
 import org.junit.Test;
 
 import redis.clients.jedis.Jedis;
+import redis.clients.jedis.JedisException;
 import redis.clients.jedis.JedisShardInfo;
 import redis.clients.jedis.Protocol;
 import redis.clients.jedis.tests.commands.JedisCommandTestBase;
@@ -41,4 +42,16 @@ public class JedisTest extends JedisCommandTestBase {
         Jedis jedis = new Jedis(shardInfo);
         jedis.get("foo");
     }
+
+    @Test(expected = JedisException.class)
+    public void timeoutConnection() throws Exception {
+        jedis = new Jedis("localhost", 6379, 15000);
+        jedis.auth("foobared");
+        jedis.configSet("timeout", "1");
+        // we need to sleep a long time since redis check for idle connections
+        // every 10 seconds or so
+        Thread.sleep(20000);
+        jedis.hmget("foobar", "foo");
+        jedis.configSet("timeout", "300");
+    }
 }