Add properties validation arangodb.host

Author: mpv1989

ChangeLog

@@ -1,6 +1,7 @@
 v4.2.x (xxxx-xx-xx)
 ---------------------------
 * fixed ArangoDatabase.transaction(): ignore null result
+* added properties validation arangodb.host
 
 v4.2.3 (2017-07-31)
 ---------------------------

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

@@ -90,7 +90,13 @@ protected static void loadHosts(final Properties properties, final Collection<Ho
 	}
 
 	protected static String loadHost(final Properties properties, final String currentValue) {
-		return getProperty(properties, PROPERTY_KEY_HOST, currentValue, ArangoDBConstants.DEFAULT_HOST);
+		final String host = getProperty(properties, PROPERTY_KEY_HOST, currentValue, ArangoDBConstants.DEFAULT_HOST);
+		if (host.contains(":")) {
+			throw new ArangoDBException(String.format(
+				"Could not load property-value arangodb.host=%s. Expect only ip. Do you mean arangodb.hosts=ip:port ?",
+				host));
+		}
+		return host;
 	}
 
 	protected static Integer loadPort(final Properties properties, final int currentValue) {

src/test/java/com/arangodb/ArangoDBTest.java

@@ -433,6 +433,11 @@ public void loadproperties() {
 		new ArangoDB.Builder().loadProperties(ArangoDBTest.class.getResourceAsStream("/arangodb-bad.properties"));
 	}
 
+	@Test(expected = ArangoDBException.class)
+	public void loadproperties2() {
+		new ArangoDB.Builder().loadProperties(ArangoDBTest.class.getResourceAsStream("/arangodb-bad2.properties"));
+	}
+
 	@Test
 	public void accessMultipleDatabases() {
 		try {

src/test/resources/arangodb-bad2.properties

@@ -0,0 +1 @@
+arangodb.host=127.0.0.1:8529