Fix property loading & prepare release 4.3.7

Author: mpv1989

ChangeLog

@@ -1,6 +1,7 @@
-v4.3.7 (2018-xx-xx)
+v4.3.7 (2018-04-17)
 ---------------------------
 
+* fixed property loading
 
 v4.3.6 (2018-04-16)
 ---------------------------

pom.xml

@@ -4,7 +4,7 @@
 
 <groupId>com.arangodb</groupId>
 <artifactId>arangodb-java-driver</artifactId>
-<version>4.3.7-SNAPSHOT</version>
+<version>4.3.7</version>
 <inceptionYear>2016</inceptionYear>
 <packaging>jar</packaging>
 

src/main/java/com/arangodb/internal/InternalArangoDB.java

@@ -137,8 +137,9 @@ protected static Integer loadMaxConnections(final Properties properties, final I
 }
 
 protected static Long loadConnectionTtl(final Properties properties, final Long currentValue) {
-return Long.parseLong(getProperty(properties, PROPERTY_KEY_CONNECTION_TTL, currentValue,
-ArangoDBConstants.CONNECTION_TTL_VST_DEFAULT));
+final String ttl = getProperty(properties, PROPERTY_KEY_CONNECTION_TTL, currentValue,
+ArangoDBConstants.CONNECTION_TTL_VST_DEFAULT);
+return ttl != null ? Long.parseLong(ttl) : null;
 }
 
 protected static Protocol loadProtocol(final Properties properties, final Protocol currentValue) {