Potential overflow in int multiplication (#24)

Potential overflow in int multiplication before it is convert to long
by use in an assignment context. An integer multiplication that is
assigned to a variable of type long or returned from a method with
return type long may cause unexpected arithmetic overflow.

Signed-off-by: Thibault Meyer <meyer.thibault@gmail.com>

Author: thibaultmeyer

src/main/java/io/ebean/datasource/pool/ConnectionPool.java

@@ -203,7 +203,7 @@ public ConnectionPool(String name, DataSourceConfig params) {
     this.transactionIsolation = params.getIsolationLevel();
 
     this.maxInactiveMillis = 1000 * params.getMaxInactiveTimeSecs();
-    this.maxAgeMillis = 60000 * params.getMaxAgeMinutes();
+    this.maxAgeMillis = 60000L * params.getMaxAgeMinutes();
     this.leakTimeMinutes = params.getLeakTimeMinutes();
     this.captureStackTrace = params.isCaptureStackTrace();
     this.maxStackTraceSize = params.getMaxStackTraceSize();
@@ -217,7 +217,7 @@ public ConnectionPool(String name, DataSourceConfig params) {
     this.heartbeatsql = params.getHeartbeatSql();
     this.heartbeatFreqSecs = params.getHeartbeatFreqSecs();
     this.heartbeatTimeoutSeconds = params.getHeartbeatTimeoutSeconds();
-    this.trimPoolFreqMillis = 1000 * params.getTrimPoolFreqSecs();
+    this.trimPoolFreqMillis = 1000L * params.getTrimPoolFreqSecs();
 
     queue = new PooledConnectionQueue(this);